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- Newsgroups: sci.physics.fusion
- Path: sparky!uunet!usc!sdd.hp.com!mips!pacbell.com!tandem!zorch!fusion
- From: Frank Close <FEC@v2.rl.ac.uk>
- Subject: DD->4He + gamma
- Message-ID: <199207300852.AA20319@ames.arc.nasa.gov>
- Sender: scott@zorch.SF-Bay.ORG (Scott Hazen Mueller)
- Reply-To: Frank Close <FEC@v2.rl.ac.uk>
- Organization: Sci.physics.fusion/Mail Gateway
- Date: Thu, 30 Jul 1992 13:34:16 GMT
- Lines: 55
-
- Someone wrote "I think dd->alpha violates some quantum transition rules"
- In fact it is even more basic: it violates energy momentum conservation and
- that is why something has to be radiated (gamma).
-
- For those interested in why: The mass of an alpha is *less* than that of two
-
- deuterons. The minimum initial energy that the two deuterons can have is if
- theyare at rest and they then fuse to make an alpha at rest. This satisfies
- momentumbut the *energy* (mass = rest energy/c**2) dont balance because of the
- mass
- defect of the alpha. The result is that the alpha is produced in a short lived
- eexcited state and sheds the excess by gamma radiation.
-
-
- Anyone who has studied QED knows that it costs probability to shed gammas -
- roughly alpha=1/137 per gamma in the matrix element. The more gamma you shed
- theless chance. So shedding 2,3 etc is less and less likely. Even one kills you
- by around a million relative to the "direct" strong processes of t+p or
- n+3He.
-
- Concerning Ying, and the whole world for that matter: forget theory and
- look for products. No products, no fusion. As explained in detail a
- couple of months ago these arguments about products depend only on
- *general* arguments of *energy conservation* and the order of magnitudes
- of nuclear binding energies (which are the *source* of any energy released
- in nuclear transmutations).
-
- Invoke as many miracles as you like to hide the products of dd fusion
- and you wont explain the lack of products in the data *unless* you are
- prepared to give up *energy conservation*. Even Jed Rothwell keeps
- on about energy conservation, so it seems even he is ont prepared to give
- up thta property (I am sure Jed will correct me if I am wrong; I have only
- quoted from memory). I am nopt prepared to, by the way, but here is an
- historical note that might amuse younger readers.
-
- Pauli invented the idea of the neutrino in order to explain the *apparent*
-
- violation of energy-momentum conservation in beta decay (193x). This is
- now confirmed exptally. What is less widely known is that people as eminent
- as Bohr seriously considered the possibility that E-mom might *not* be
- conserved in nuclear beta decay; their thesis being that we had seen a whole
- new change in outlook going from macroscopic to *atomic* dimensions, quantum
- theory etc; and now one was extrapolating those ideas to *nuclear* dimensions
- which was a comparable leap in scale.
-
- I posted this for three reasons.
- 1."Establishment" science *is* open to "crazy" ideas
- 2.Why have the believers in cold nuclear fusion (sic) been so conservative
- and not suggested this "obvious" explanation: energy *not* conserved.
- The ultimate free lunch.
- 3. Sorry. My memory has a half-life shorter than lithium-11 and I
- forgot what the third post was supposed to be. Maybe I recoiled from the
- enormity of the rest of this posting.
-
-
-