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Science Technology

Stimulated Gamma Decay Weapons 562

ExRex writes "New Scientist is reporting on a USDOD project to produce super explosives. 'An exotic kind of nuclear explosive being developed by the US Department of Defense could blur the critical distinction between conventional and nuclear weapons. The work has also raised fears that weapons based on this technology could trigger the next arms race.'"
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Stimulated Gamma Decay Weapons

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  • Bad news... (Score:4, Funny)

    by TopShelf ( 92521 ) * on Thursday August 14, 2003 @02:35PM (#6698314) Homepage Journal
    This research cannot by allowed to go forward. We all know what happens when gamma rays [amazon.com] are used in weapons!
    • by AtariAmarok ( 451306 ) on Thursday August 14, 2003 @02:43PM (#6698425)
      The decay thing is a stroke of genius. If you set the half-life right, the mighty Hulks will march out, smash puny enemy army, and by the time they are about to turn around and smash puny you, they rot into a pile of goo.
    • Re:Bad news... (Score:3, Insightful)

      Yes, we all know what happens. A bad movie gets made that does no justice whatsoever to the original comic and several hollywood execs snort another line of coke whilst discussing what cars they are buying from the profits of the movie they managed to get people to see in the hopes that it would do justice to the orignal comic (see second sentence).

  • by AtariAmarok ( 451306 ) on Thursday August 14, 2003 @02:36PM (#6698331)
    What country is going to be able to stop the might of a vast army of Hulks once they get this gamma-process down pat?

    The only challenge is to get them to stop smashing any tank they see.
  • Wow... (Score:3, Funny)

    by CoolVibe ( 11466 ) on Thursday August 14, 2003 @02:36PM (#6698339) Journal
    Does that mean that the army will be equipped with mini nukes like in "Starship Troopers"?

    Gosh...

    • Re:Wow... (Score:5, Informative)

      by saskwach ( 589702 ) on Thursday August 14, 2003 @02:47PM (#6698490) Homepage Journal
      Funny, I was just reading "Starship Troopers" last night...but no, there are bans on that:
      In the 1950s, the US backed away from developing nuclear mini-weapons such as the "Davy Crockett" nuclear bazooka that delivered an explosive punch of 18 tonnes of TNT. These weapons blurred the divide between the explosive power of nuclear and conventional weapons, and the government feared that military commanders would be more likely to use nuclear weapons that had a similar effect on the battlefield to conventional weapons.
      That's what you're thinking of...this is not actually a nuke.
      • Re:Wow... (Score:5, Informative)

        by jafiwam ( 310805 ) on Thursday August 14, 2003 @03:45PM (#6699160) Homepage Journal
        The "Davy Crockett" is more accurately described as a portable recoilless rifle launched nuke. It's about the same size as a more modern TOW setup, can go on a tripod. It probably took 4 or 5 guys to carry all the stuff on foot, so it's not really a bazooka (an anti-tank weapon).

        It had a "dial a yield" warhead from 10 to 250(1) Tons of TNT. The higher settings would cause almost certain death to the launch crew as the lethal radiation kill zone was much farther than the maximum range of even the biggest launcher (2 miles or so).

        One of the new thingies or an old Davy Crockett might be a good device to wipe out a bunch of tanks out in a desert, but it's still a friggin huge weapon compared to the precision stuff used nowdays. (I doubt any army will be dumb enough to go head-to-head against the US Army in desert tank battle for a looonngg time. Even the Iraqis didn't try it a second time.)

        Here's some links with pictures:
        http://www.wikipedia.org/wiki/Davy_Crockett_(nucle ar_device) [wikipedia.org]

        http://www.guntruck.com/DavyCrockett.html [guntruck.com]
  • GASERs.... (Score:3, Insightful)

    by Jonsey ( 593310 ) on Thursday August 14, 2003 @02:36PM (#6698340) Journal
    That'll be a hard name to pull by the committees. GASERS or Gamma ray Amplification by Stimulated Emission of Radiation (I may have those last two wrong).

    So we're building gamma-ray shooting guns... Like lasers, but higher energy, and thus, with more chances of cell mutation & general badness. I'll call 'em nuclear weapons for now, and maybe later, only inhumane.
    • by AgentPhunk ( 571249 ) on Thursday August 14, 2003 @02:39PM (#6698377)
      Yes, but all I want to know is if I can get them mounted on the heads of a few sharks I have.
    • Well, the acronym I've generally seen used (esp. in Sci-Fi e.g. David Weber) is GRASER.

      And given that they have multi-year fallout effects within the target area, I'd definitely classify them as much "nuclear" weapons as dirty bombs -- in short, any weapon with non-trivial radioactive fallout.

      Xentax
      • Re:GRASERs.... (Score:3, Informative)

        by Valdrax ( 32670 )
        Well, it shouldn't matter anyway; these weapons aren't true grasers, though the principle is oddly symmetric.

        A graser, like any "?aser" device works by stimulating energized electrons to transition to a lower shell immediately (instead of at a random time) by smacking another photon into it, causing the atom emit a photon (always of a certain frequency) in the same direction that the original photon was moving. The gamma decay device works by stimulating the nucleus is a very similar way with X-rays until
  • err.. (Score:5, Insightful)

    by kmak ( 692406 ) on Thursday August 14, 2003 @02:37PM (#6698342)
    could blur the critical distinction between conventional and nuclear weapons

    Because you know, it's not how many people died, it's the weapons used!

    Gosh.
    • Re:err.. (Score:5, Insightful)

      by JohnsonJohnson ( 524590 ) on Thursday August 14, 2003 @03:18PM (#6698893)

      Because you know, it's not how many people died, it's the weapons used!

      No, it's whether the collateral damage makes the battlefield useless afterwards. Little chunks of gamma emitters with a 31 year half life lying all over the place means whoever is left around has to deal with the consequences of a fight they may have had no part in, or may not even remember what the conflict was all about to begin with.

      It seems that it will be the case that the ancient Greeks, Romans, Egyptians, Chinese etc. left beautiful ruins and philosophy, and Anglo-American civilization will leave little poison pills for future archeologists to uncover.

      • Re:err.. (Score:4, Funny)

        by Chris Y Taylor ( 455585 ) on Thursday August 14, 2003 @03:33PM (#6699057) Homepage
        With a half-life of only 31 years, the archeologists would have to work fast.
      • Re:err.. (Score:4, Interesting)

        by Guppy06 ( 410832 ) on Thursday August 14, 2003 @05:57PM (#6700954)
        "It seems that it will be the case that the ancient Greeks, Romans, Egyptians, Chinese etc. left beautiful ruins and philosophy,"

        You mean like the beautiful ruins the Romans left us in Carthage? Oh, wait...

        The ability for an army to raze a city is not something unique to the past century. Or the past millenium, for that matter. The "beautiful ruins and philosophy" you speak of are only there because they were built by the winning side. Note that you said:
        • "Greeks" instead of "Iranians"
        • "Romans" instead of "Lybians"
        • "Egyptians" instead of "Sudanese"
        And the only reason I can't think of somebody the Middle Kingdom raped/pillaged/slaughtered off of the top of my head is that the schools I attended had a "Western" bias.
  • Hulk Smash puny scientists and the DOD!!

    Arrgh!! Hulk hate gamma decay makes hulk look old and grey!

  • by in7ane ( 678796 ) on Thursday August 14, 2003 @02:38PM (#6698358)
    Dr. Evil not available for comment.

    However, this will soon be appearing in an online marketplace near you: http://www.villainsupply.com/superweapons.html
  • by darkstar949 ( 697933 ) on Thursday August 14, 2003 @02:38PM (#6698360)
    My basic question concerning this is two-fold, is this realy needed, and if it is created will we be able to control the techology. With world events the way they are now it seems like one of the last things that we end is a small high yeild weapon that can fall into the worng hands. At least with nuclear weapons there are some means of detecting their presence, but it seems that these weapons will not have the same signature.
    • Of course it isn't a good idea. Inventing new ways to kill others (and therefore to be killed, yourself) has always been a human fallacy. Scientists always do such research and make such discoveries strictly in the name of science. Those guys in Texas (who observed this effect) were likely not trying to pioneer new warfare (they were working towards super-batteries), but the militant and the paranoid ones immediately took over.

      The thing that needs to happen (in order for the human race to become truly e
  • birds and snakes, an aeroplane...
    um...
    gamma weapons blow us away?

    Everybody sing: "It's the end of the world as we know it..."
  • Neat (Score:4, Interesting)

    by mugnyte ( 203225 ) * on Thursday August 14, 2003 @02:39PM (#6698385) Journal
    While I don't condone weapons research, I think this is certainly interesting. If the RPGs flaunted around today were capable of Tomakawk-size destruction, i think we'd simple see skirmishes ending faster, in a "disease-burnout" kind of way. I'd hate to see this effect be used as weaponry by anyone, but if people are going to fight, the faster its over the better, in my mind. Maybe I'm mistaken?
    • Re:Neat (Score:5, Insightful)

      by mszeto ( 133525 ) <mszetoNO@SPAMscompton.ca> on Thursday August 14, 2003 @02:44PM (#6698445)
      but if people are going to fight, the faster its over the better, in my mind. Maybe I'm mistaken?

      I think that if you have super fast battles (read: anti tank missles against a house, or carpet bombing) people end up forgetting that there are real people on the other side. The slower it is (and the more they see), the more people remember that war is dumb. Things are only getting faster, unfourtunately.
      • Re:Neat (Score:4, Informative)

        by pmz ( 462998 ) on Thursday August 14, 2003 @03:44PM (#6699152) Homepage
        The slower it is (and the more they see), the more people remember that war is dumb.

        The History Channel had a documentary about one Christmas day during World War One, where the German and Allied soldiers started singing carols and eventually met each other for a one-day Christmas cease fire (they even held soccer matches with eachother). After that day, they had trouble gathering the motivation to kill eachother, and the military leaders basically had to force the war to continue.

        Any war relies on de-humanizing the enemy, which is most often a large collection of ordinary people under different circumstances and under the leadership of a psychopath (Adolph Hitler, Osama bin Laden, etc.).

    • Re:Neat (Score:4, Insightful)

      by Imabug ( 2259 ) on Thursday August 14, 2003 @02:58PM (#6698647) Homepage Journal
      the inventor of the Gatling gun had similar ideas. He thought that if he could create a weapon that was so devastating to use, nobody would want to go to war anymore. We all know where that led.
      • Re:Neat (Score:3, Insightful)

        by mikerich ( 120257 )
        the inventor of the Gatling gun had similar ideas. He thought that if he could create a weapon that was so devastating to use, nobody would want to go to war anymore. We all know where that led.

        And the developers of chemical weapons, and biological weapons, and the bomber, and the battleship, and nuclear weapons...

        I'm beginning to suspect they might all have been wrong.

        Best wishes,
        Mike.

    • Wars end lots faster than they used to; it used to take 6-12 months *minimum* to raise an army of 50,000 men that consisted primarily of poorly equipped hand-to-hand infantry. But once the hacking and slashing finished a year or so later, everybody was done for good long while.

      Now it seems that we (at least the US) can put an armored force of 200,000 anywhere it wants within a couple of months and win the war in 90 days..but the low-grade fighting just doesn't stop. The Israelis took the west bank in '67
  • by Pavan_Gupta ( 624567 ) <`pg8p' `at' `virginia.edu'> on Thursday August 14, 2003 @02:40PM (#6698390)
    "Such extraordinary energy density has the potential to revolutionise all aspects of warfare."

    This interesting technology could potentially lead to some better new-age energy sources. I'm not sure why we always focus on warfare, when there are other ways to use the explosive power of new military technology.
    • Because you have to pump energy into the system to get any back out. At best, it would be a way to increase the efficiency of existing power generators (nuclear plants, solar panels, etc).
    • I agree. In reading the article, I couldn't help but wonder what kind of side effects come from the reaction. It did mention the following:

      It would cause little fallout compared to a fission explosion, but any undetonated isomer would be dispersed as small radioactive particles, making it a somewhat "dirty" bomb. This material could cause long-term health problems for anybody who breathed it in.

      Could these undetonated isomers be "recycled" in a controlled reactor? In other words, are there any byproduc

    • Just how do you propose keeping those Hulks chained to those treadmills powering the turbines?
    • by LinuxParanoid ( 64467 ) * on Thursday August 14, 2003 @03:00PM (#6698671) Homepage Journal
      You raise a good point, but...

      Energy density != Energy efficiency.

      You want the former for weapons, the latter for commercial energy production.

      (Although in the case of fuel substitutes for cars, both are actually quite important. No matter how much you improve the efficiency and cost of hydrogen or fuel cells, its hard to beat oil's energy density.)

      Anyway, based on that article, it appears to me that it takes a heck of a lot of energy to make and "energize" the halfnium with protons (or eventually photons). A lot more than you get out when you eventually shoot the X-Ray in and get that 60-fold increase out. That 60-fold increase is just releasing energy you put in the substance gradually earlier. So it isn't necessarily energy efficient, just energy-dense. Of course, as they make the substance cheaper, that is a sign that they're improving the energy efficiency of the manufacturing process, so who knows how good they'll get at that. Clearly they have a long way to go in any case. Particle accelerators aren't cheap, either dollar-wise or energy-wise.
    • by Idarubicin ( 579475 ) on Thursday August 14, 2003 @03:00PM (#6698682) Journal
      This interesting technology could potentially lead to some better new-age energy sources.

      Well, it's a way to store energy, perhaps, but it can't act as a source in and of itself. Excited-state nuclei aren't just lying around in the ground--they tend to have short half-lives, from decades down to the tiniest fractions of a second. To create these metastable nuclei, you have to put in at least as much energy as you're taking out.

      Mind, these metastable isotopes already have nonmilitary uses. Technetium-99m has long been used as a radioactive tracer in medicine. It is produced from the decay of molybdenum-99, and has a half-life of about six hours.

  • Next Arms Race (Score:5, Insightful)

    by TrollBridge ( 550878 ) on Thursday August 14, 2003 @02:40PM (#6698395) Homepage Journal
    "The work has also raised fears that weapons based on this technology could trigger the next arms race."

    New warfare technology has ALWAYS triggered a new "arms race", starting with the first human being who ever beat another to death with a rock.

    Imagine their terror when the first knives, attlatls, and later bows & arrows started to be used in combat?

    This is simply the latest iteration of an age-old phenomenon.

  • This is actually a few years old in concept and the impetus behind a lot of supercomputer projects funded by the DOE and DOD to study explosions and high energy phenomena. There has been a move to miniaturize nuclear weapons for some time now for a couple of reasons 1) easier to transport and carry and 2) extremely low yeild small tactical nukes can be very effective and potentially tuneable. (General only wants damage limited to 5 sq miles and nothing beyond.) The other advantage that these folks are ta
  • by chia_monkey ( 593501 ) on Thursday August 14, 2003 @02:41PM (#6698406) Journal
    'One gram of fully charged hafnium isomer could store more energy than 50 kilograms of TNT.'

    That's just scary. Way scary.
    • Misleading title? (Score:3, Interesting)

      by ifwm ( 687373 )
      "The effect of a nuclear-isomer explosion would be to release high-energy gamma rays capable of killing any living thing in the immediate area." They call this an explosion, and they use tons of TNT as the benchmark. Is it really an explosion? The primary killing force in this device seems to be gamma radiation. I believe when they say "energy" in this article, they mean gamma radiation, and not explosive force, but I can't confirm it.
  • by Rhone ( 220519 ) on Thursday August 14, 2003 @02:42PM (#6698417) Homepage
    I can just picture the next headline at The Onion [theonion.com]:

    Iran Sends Weapons Inspectors to US to Search for Weapons of Mass Destruction
  • It really scares me that when a new way to release massive amounts of energy is discovered, it's first implementation is to end human lives.
  • Cool! (Score:2, Insightful)

    by Wakko Warner ( 324 ) *
    An arms race? With who?

    What is this country so fucking afraid of?

    - A.P.
  • Super Batteries (Score:2, Interesting)

    by notcreative ( 623238 )

    I'm suprised that the potential for batteries wasn't discussed. What if this technique allowed better energy storage than we have now? What if we could store electricity when and where we produce it, and move it to where and when we want to use it? I guess what I'm asking is: when can I run my laptop off of one, and will it cause "flipper-babies?"

  • by panurge ( 573432 ) on Thursday August 14, 2003 @02:47PM (#6698501)
    A weapon so small that a suicide bomber can use it to wipe out significant parts of city centres. So "we" have to have more and better of them first in case someone else develops them. How much security is going to be needed to make sure none of these interesting munitions escape into the wild? How much civil liberty will we have to give up so we can enjoy increased protection? I'm beginning to think what the world really needs is a development program for a weapon that destroys military installations and leaves people standing.
  • by LinuxParanoid ( 64467 ) * on Thursday August 14, 2003 @02:48PM (#6698507) Homepage Journal
    The effect of a nuclear-isomer explosion would be to release high-energy gamma rays capable of killing any living thing in the immediate area. It would cause little fallout compared to a fission explosion, but any undetonated isomer would be dispersed as small radioactive particles, making it a somewhat "dirty" bomb. This material could cause long-term health problems for anybody who breathed it in.

    I'm wondering how big a problem this "dirty bomb characteristics" issue is. How much of the isomer really doesn't detonate (and why?) Is this a 1% of the substance doesn't detonate (decay suddenly when hit with an X-ray) problem or a 50% doesn't detonate? And if the amount of the material is small enough (e.g. a gram), perhaps this falls below injurious-in-practice threshholds? I.e. how close to conventional low-yield nuclear really is it?

    --LP

  • by mkro ( 644055 ) on Thursday August 14, 2003 @02:51PM (#6698559)
    The work has also raised fears that weapons based on this technology could trigger the next arms race.

    Riight... Like the U.S. would let anyone else even participate in a race. Any country going in that direction will first be nudged lightly with reminders of economic sanctions, and if that doesn't stop them, nudged lightly with a sledgehammer.

    The race is over, the U.S. won, but they seem to go on racing on their own. (No poetry intended)
    • Yeah! (Score:3, Interesting)

      by Greyfox ( 87712 )
      You're absolutely right! Look how effective our sanctions have been with Cuba! Why they capitulated after only... oh... wait... Well the invasion was very... um... Well you see they don't really have oil...

      While we're on that subject (Since I'm gonna get modded down now anyway) did anyone read between the lines with the recent Liberia situation? I could just see Bush talking about how we were considering sending troops (Translation: "I asked for an oil report on the country, and if it looks good I might d

  • And this is legal under international laws and multilateral agreements, just how? Even the MOAB is disputable, due to its chemical base, and this will almost certainly be disputed?

    Regards,
    --
    *Art
  • by inertia187 ( 156602 ) * on Thursday August 14, 2003 @02:53PM (#6698586) Homepage Journal
    This is the best part of the article: "The hafnium explosive could be extremely powerful. One gram of fully charged hafnium isomer could store more energy than 50 kilograms of TNT. Miniature missiles could be made with warheads that are far more powerful than existing conventional weapons, giving massively enhanced firepower to the armed forces using them."

    In fifty years, we'll be defending our right to bare hafnium tipped bullets. God Bless America.
  • by praedor ( 218403 ) on Thursday August 14, 2003 @02:57PM (#6698637) Homepage

    and means of detonation, this isn't much different than neutron bombs. You could produce a small yield neutron bomb and do the same thing and be less dirty with the radioactive material.


    As a military member myself, I cannot say that this weapon is "attractive" to me. As a commander, I wouldn't want to use it as a matter of course any more than I would want to use a nuke. I WOULD use a nuke or this weapon, however, in a dire emergency, which appears to be precisely what this weapon is NOT intended for. It is seen as something with general use potential...to some in DOD halls where everything is clean theory but not to me, a line guy.


    As far as I am concerned, use of such a weapon would barely be a step up from use of a dirty bomb, which would rightly be seen as illegal and an act of terror. Not me, no thanks.

    • by Phanatic1a ( 413374 ) on Thursday August 14, 2003 @03:24PM (#6698953)
      You could produce a small yield neutron bomb and do the same thing and be less dirty with the radioactive material.


      Huh? A small-yield neutron bomb?

      A neutron bomb is a fusion warhead. As such, it requires a fission warhead to set it off. A 'small yield' fission warhead is, at the very least, going to be equivalent to anywhere from a few hundred to a few thousand tons of TNT, and the second stage fusion warhead, which releases the neutrons, is going to add to that. "Small-yield fusion bomb" is something of an oxymoron.

      And neutron bombs are rather dirty, indeed. In addition to the fallout from the fission primary, the intense neutron flux transmutes many substances, notably metals, in the surrounding area into radioisotopes. Some of those will have rather long half-lives.

  • teehee (Score:5, Funny)

    by CHatRPI ( 627527 ) on Thursday August 14, 2003 @02:57PM (#6698638)
    If I hear one more hulk joke, I'm going to get very angry. You wouldn't like me when I'm angry.
  • The question should be whether this is a relatively stable means of generating energy? What would be the resulting waste and can every house have its own power plant? That could be pivotal to the nations energy usage.

    Does anyone know the answers to these questions? I know its difficult to manufacture now, so don't flame me on that. Anyone know anything about the containment of hafnium?
    • Doubt it. From what it reads like, it seems like you need to put just as much of energy in as what you get out. The only difference is that the amount of rate of energy release is an incredible amount [ie explosion]. It's like when you overfill a balloon and it explodes.
  • by jakedata ( 585566 ) on Thursday August 14, 2003 @03:14PM (#6698859)
    How long could one of these weapons stay viable?
    They said that the Halfnium component has a 31 year half life. I bet the weapon becomes non-viable long before that.

    In one sense that is good. Proliferation of this weapon might not be as much of a long term threat. When the support infrastructure is removed, the weapon might decay rapidly enough to mitigate proliferation issues when compared to Plutonium and Uranium.
  • Next stop Pluto? (Score:4, Interesting)

    by iCat ( 690740 ) on Thursday August 14, 2003 @03:18PM (#6698895)
    If 1g hafnium > 50 kg TNT, wouldn't this make an excellent fuel for a spacecraft's propulsion system? How does the energy density stack up against conventional/current experimental rocket systems? As I understand it one of the difficulties in sending a probe to Pluto is not getting there, but carrying sufficient fuel to be able to slow and enter orbit once it arrives.
  • Next rocket fuel? (Score:3, Interesting)

    by Shishak ( 12540 ) on Thursday August 14, 2003 @03:26PM (#6698972) Homepage
    Could this be used for the next rocket fuel? Controlled explosion of high density hafnium-178m2. The research doesn't necessarily have to create the next bomb. Could this be the way we reach Mars?
  • by A55M0NKEY ( 554964 ) on Thursday August 14, 2003 @03:51PM (#6699227) Homepage Journal
    Some dudes discovered this with a dental X-Ray machine in like 2000 or something, and then in 2001, Lawrence Livermore tried to replicate it with a 'much larger xray machine' and said that they got nothing. This was before 9/11 when mini nukes were Taboo. But now that the gubmint wants mini nukes for bunker busting, Lawrence Livermore is researching this again, and think's it's promising.

    My conspiracy theory is that Lawrence Livermore or Area 51 or some such government run hush hush spot may have a weapon based on this on the drawing board, or even in development. When the dudes published the idea in 2000, Lawrence livermore published fake negative results to keep the other countries of the world from working on the idea, and then secretly have been working on it ever since. Now that mini-nukes are back in style since 9/11, they can even say they're working on it in public and don't have to hide their research.

  • by QuantumRiff ( 120817 ) on Thursday August 14, 2003 @03:54PM (#6699268)
    Of course, the Generals always want to build bombs out of stuff, but what about the line:

    The experiment released 60 times as much energy as was put in, and in theory a much greater energy release could be achieved.


    Is this counting the energy put into "loading" the isotope? Whith the kind of energy they are talking about, this could be huge for us. Think "Nuclear Fusion" without the Nuclear part!! cleaner power, and no hippy anti-nuke types protesting.. I'm trying to remember my old science classes here, aren't the "Gama" radiation bits realitively easy to block?.. A room with lead walls, a bit of this chemical, and X-ray generator, and a large vat of water to make steam... How many years have we spent trying to get Nuclear Fusion to produce more power than went in to making the reaction?! and this is 60 times the engery with a few x-rays!! Why does science always have to deal with weapons first? can't we just pretend that our planet as a whole is growing up and thinking about peace?

  • not very plausible (Score:5, Informative)

    by bcrowell ( 177657 ) on Thursday August 14, 2003 @04:55PM (#6700282) Homepage
    I did my thesis research on isomers like these, and this doesn't sound plausible to me at all. Here [lbl.gov] is some data on the isomer they're talking about. The reason this isomer is cool from a basic research point of view is that it has 16 units of spin, which is a huge amount for a long-lived state; most high-spin states decay rapidly (within nanoseconds) by emitting gamma-rays, which means there's no way to store them in bulk, not even in theory. The reason this particular state has such an unusually long half-life is that there aren't any lower-energy states with similar spins, and it's hard to get a gamma ray to carry off more than one or two units of spin.

    The article says they're planning to make this isomer in gram quantities by shooting gamma rays into a sample of ground-state 178Hf, which is the reverse of the decay process. The problem is that the cross-section is going to be very low, for exactly the same reason: it's hard to get a photon to carry many units of angular momentum into or out of a nucleus. People have discussed making small (microgram) quantities of it for use as a high-spin target in reactor experiments, but nobody could figure out any reasonable way to do it.

    You also have to realize that although the half-life of 31 years is long compared to most isomeric states, it's still relatively short compared to, say, 235U, which lives for gazillions of years. The relatively short half-life means that even if you could get a gram of this stuff, it'd be virtually impossible to handle safely. It would be much more radioactive than a subcritical mass of weapons-grade fissionables.

    There's a long history of impractical ideas like this, going back to the Reagan-era idea of a gamma-ray laser. Luckily we're still only faced with the same basic bomb threats that've been around since the Kennedy administration, but that's bad enough. The real thing to worry about, IMO, is the nuclear cauldron that's shaping up in Asia: Iran, Afghanistan, India, and North Korea.

    OT: Are other people finding Slashdot extremely slow and unresonsive recently? I can hardle even access it anymore.

  • Timeline (Score:5, Informative)

    by Oestergaard ( 3005 ) on Thursday August 14, 2003 @05:49PM (#6700877) Homepage
    The article claims that the AF supplier, SRS Technologies, said that technology to provide the materials needed in "gram quantities" would be about five years away (he say they "would exist within five years").

    Certainly, for a project such as this, it is completely unbelievable that one of the key entities in the weapon development would give anyone and everyone a remotely precise estimate as to when larger scale production (and real weapon production) could possibly begin.

    The true timeline must be years away from that. In one of the two directions possible... Which poses an interesting question: are real weapons based on this technology available today already, and did they agree to participate in the story simply to "prepare" the general public for real-world testing which will happen in the following year or two? Or do they know that others are working on this technology as well, and therefore need to tell their nation that "they're right on it", when some other country launches their tests within the next year or two?

    That's speculation. Time will show.

    What will be interesting to see, too, is how the real testing will commence. Currently they are working on three possibly viable materials. Most likely they will have different characteristics, and their exact effects in a real-world scenario will be impossible to simulate.

    In 1945, there were two materials available for fission weapons - uranium and plutonium. One bomb was made with each, and the two bombs were dropped on each their civilian target. Hiroshima got Uranium, Nagasaki got Plutonium.

    Which three cities will this new weapon be tested on? And to raise the bar, which city will get Hafnium, which one will get Thorium, and which one will get Niobium?

    Oh, and don't tell me war has gone soft and that the weapon would not be tested on civilian targets this time... A gamma discharge weapon has many of the properties of a neutron weapon - it is extremely useful mostly against people (and electronics - it will kill you *and* your Aibo, oh the wonders of modern civilization ;).

    On a second note... Did anyone notice how there is no longer anything called a "neutron bomb"? It is, today, called a "low yield" bomb. In the media at least. Because it's blast and heat isn't as great as "real" fusion weapons. Neutron weapons are now almost politically correct - at least, the public wouldn't raise an eye if they were told a low-yield bomb was dropped to stop riots in some third-world city.

    Now, to go find lead coating for my tinfoil hat.

"Pok pok pok, P'kok!" -- Superchicken

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