Glossary entry (derived from question below)
English term
spallation
There are many distinct methods of producing sufficiently strong neutron beams for science. Because of their flux (see below), that is higher by several orders of magnitude, nuclear reactors and spallation sources are nowadays preferred to radioisotope, photon or accelerator sources. (AUSTRON )
Finally, the pulsed proton beam will be directed onto a liquid mercury target, where 60-Hz pulses of neutrons will be created through spallation reactions of the protons with the mercury nuclei. (Spallation Neutron Source)
With the world's highest flux reactor-based neutron source (the High Flux Isotope Reactor) and the world's most intense pulsed accelerator-based neutron source (the Spallation Neutron Source), ORNL provides neutron scattering capabilities unavailable anywhere else in the world. (Oak Ridge National Laboratory)
5 +2 | spalaţie | Radu DANAILA |
Nov 10, 2008 17:00: Mauricio Zoch changed "Stage" from "Preparation" to "Submission"
Nov 13, 2008 17:54: changed "Stage" from "Submission" to "Selection"
Apr 29, 2009 10:54: changed "Stage" from "Selection" to "Completion"
Apr 29, 2009 11:12: Radu DANAILA changed "Edited KOG entry" from "<a href="/profile/0">'s</a> old entry - "spallation"" to ""spalaţie""
Apr 29, 2009 11:17: Radu DANAILA changed "Edited KOG entry" from "<a href="/profile/806327">Radu DANAILA's</a> old entry - "spallation"" to ""spalaţie""
Proposed translations
spalaţie
http://209.85.135.104/search?q=cache:13WTFrIZIEwJ:www3.fizic...
O definitie utila, insotita de detalii stiintifice, se poate gasi pe Wikipedia, la adresa:
http://en.wikipedia.org/wiki/Spallation
Energiile necesare fasciculelor hadronice pentru a ajunge la tumori localizate adanc, la peste 25 cm echivalent-apa este de ordinul a 200 MeV pentru protoni si 4800 MeV pentru ionii de carbon. Protonii si ionii grei cu aceste energii sufera procese nucleare complexe la interactia cu materia biologica. La inceputul procesului de stopare au loc reactii de spalatie, respectiv fragmentare in urma carora rezulta o multime de proiectile secundare care la randul lor pot produce diverse reactii nucleare nucleele din materia biologica. Pe masura ce fasciculul hadronic incident patrunde in substanta reactiile nucleare au loc prin mecanisme de preechilibru, reactii directe si de nucleu compus in apropierea picului Bragg aflat la finalul traiectoriei. (Proiect CNPM - Det. radioactiv. secund.)
Analiza posibilitatii transmutatiei elementelor radioactive prin reactii de spalatie induse de neutroni, posibilitatea aplicarii practice a acestei metode. (Raport final de activitate - CERES)
In toate experimentele cu fascicule radioactive relativiste sunt studiate marimi de inters pentru astrofizica cum ar fi tranzitii Gamow - Teller masurate prin reactii de schimb de sarcina, reactii de spalatie si disociere Coulomb. (Proiect - Fascicole radioactive)
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