Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993asee.nasa..137m&link_type=abstract
In Old Dominion Univ., The 1993 NASA-ODU American Society for Engineering Education (ASEE) Summer Faculty Fellowship Program p 1
Other
Electromagnetic Radiation, Elementary Particles, Excitation, Extraterrestrial Radiation, Gamma Rays, Mercury Isotopes, Neutron Decay, Neutron Emission, Neutrons, Cooling, Evaporation
Scientific paper
The investigation indicates that nuclei with excitation energy of a few hundred MeV to BeV are more likely to radiate hot nuclear clusters than neutrons. These daughter clusters could, furthermore, de-excite emitting other hot nuclei, and the chain continues until these nuclei cool off sufficiently to evaporate primarily neutrons. A few GeV excited nuclei could radiate elementary particles preferentially over neutrons. Impact of space radiation with materials (for example, spacecraft) produces highly excited nuclei which cool down emitting electromagnetic and particle radiations. At a few MeV excitation energy, neutron emission becomes more dominant than gamma-ray emission and one often attributes the cooling to take place by successive neutron decay. However, a recent experiment studying the cooling process of 396 MeV excited Hg-190 casts some doubt on this thinking, and the purpose of this investigation is to explore the possibility of other types of nuclear emission which might out-compete with neutron evaporation.
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