Visualizza la versione completa : La produzione del deuterio ultradenso

15-06-2009, 18:48
ScienceDirect - International Journal of Mass Spectrometry : High-energy Coulomb explosions in ultra-dense deuterium: Time-of-flight-mass spectrometry with variable energy and flight length (http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VND-4VP66CS-4&_user=10&_coverDate=04%2F15%2F2009&_rdoc=13&_fmt=high&_orig=browse&_srch=doc-info(%23toc%236176%232009%23997179998%231007095%23 FLA%23display%23Volume)&_cdi=6176&_sort=d&_docanchor=&_ct=14&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=d9f42733a8657090a61d79c4bcd36676)

Deuterio ultra denso ci siamo | La Tana Dell'Orso Motociclista . (http://www.lozioviaggiatore.altervista.org/?p=537)

Deuterio ultradenso prodotto in laboratorio | Le Scienze (http://lescienze.espresso.repubblica.it/articolo/articolo/1338379)

Ultra-dense Deuterium - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Ultra-dense_Deuterium#cite_note-0)

Rydberg matter - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Rydberg_matter)

16-06-2009, 11:58
Per par condico, riporto anche questo altro link:

Next Big Future: University of Gothenberg Making Microscopic Quantities of Ultradense Deuterium: 130,000 Times Denser than Water (http://nextbigfuture.com/2009/05/university-of-gothenberg-making.html)

dove, altre alla notizia, c'รจ un commento alla fine che vale la pena riportare:

"Boy, there are a lot of stretches here.

FIRST - there is no claim for an observable amount of matter in the D(-1) state. It isn't "microscopic amounts" - for "microscopic" means "visible in a microscope". Do the math, fellow NBF visionaries: 2.3 picometers ... if it were a lattice compound ... would be about 440^3 units per cubic nanometer, or 440,000^3 (about 85E15 or 85 quadrillion atoms in a cubic micrometer box. Nothing doing. They're measuring the energy (~600eV) spectroscopically, from the FRAGMENTS of the supposed union. This is not a union-of-deuterons lasting nanoseconds, or microseconds, or milliseconds, or seconds. No, these are the fragments that lasted just long enough for the D(-1) state to hold together in a laser beam for ATTOSECONDS. (That's what those little "as" annotations are on their viewgraph).

SECOND, while it is nice to foster the conjecture that such matter IF microscopically attainable, IF stable enought to survives the time-of-flight from source to fusion reactor, IF the energy-cost-of-production is far less than the increased odds (and useful energy return) of the attendant fusion exists ... THEN it is a great and wonderful thing.

THIRD, single D(-1) pseudonucleons may well exist for nanoseconds per KURT9's thesis, but again ... nanoseconds is very much too short for deeply sub-relativistic ballistic particles to traverse a source (the laser-and-"compression" chamber) to the fusion reaction chamber. Even if they only exist as single diatomic particles, lifetimes have to be raised at least into the microseconds. For practical energy production in the reactor proper (let's say, 250 MW thermal), 4.88E20 diatomic Rydberg nucleons would have to be created (assuming 3.23MeV per fusion of D(-1) to get to 4He) ... and remembering that 4He is the least likely product produced.

FOURTH (per last part of Third), the 2D + 2D = 4He reaction is well known to be very improbable in a single step, since there are LOWER ENERGY intermediate products that bleed off the excited spin-state fusion reaction (one of the key 'first principles' of fusion physics). Per the excellent if brief article in WikiPedia,

50% ... D + D = T + p
50% ... D + D = 3He + n

Researching further, D + D = 4He occurs about one in a dozen million fusion reactions nominally.

FIFTH, summing "GoatGuy's snake-oil factors" together, this looks like yet another fruitless (for fusion) avenues of research. There is only hope, and not a shred of evidence that the D(-1) Rydberg CAN be made in 1E20 nucleons/second quantities, no reference to the overall energy-of-formation, no evidence that the diatoms can exist for more than attoseconds, nothing but speculative wishes that such a material holds promise to D+D=4He reactions (which is just an uber-popular topic, anyway).

Therefore, it gets a 3 star SnakeOil award, coupled with 2 stars for the actual science, the novelty of the discovery, and the fine department of Physics at Gothenberg for letting these two obviously talented, and sketchy, researchers have their limelight.