美 英 un.宇宙射线散裂 英汉 un. 1. 宇宙射线散裂
A correlation in the plot of 124Xe/ 130Xe versus 129Xe/ 130Xe points to a 129Xe/ 126Xe ratio of ≤ 0.84 in xenon from cosmic ray spallation and allows us to set a lower limit on the amount of radiogenic 129Xe from the decay of extinct 129I in the achondrites. The average value...
Discovery of beryllium and boron in metal-deficient stars of the Galactic halo population raises raises serious problems about production of these elements by cosmic-ray spallation on interstellar CNO nuclei. Several solutions have been proposed, including confinement of cosmic rays by a strong magnetic...
The cosmic rays are comprised of essentially all the elements in the periodic table. With notable exceptions, their composition is similar to that measured in the solar system. The cosmic-ray flux decreases rapidly as energy increases, and the energy spectrum follows a power law that is ...
To better understand the early galactic production of Li, Be, and B by cosmic rayspallation and fusion reactions, the dependence of these production rates on cosmic ray models and model parameters is examined. The sensitivity of elemental and isotropic production to the cosmic ray pathlength magnit...
Cosmic-ray-produced neon and helium in the summit lavas of Maui A 3 He component attributed to cosmic-ray-induced spallation reactions ( 3 He c ) in silicate minerals has recently been identified in lava flows on the su... K Marti,H Craig - 《Nature》 被引量: 79发表: 1987年 加载更多...
Li, Be, B are secondary in cosmic rays, as are many of the odd-Z elements, as well as the sub-Fe elements. At very low energies, cosmic ray particles are subject to ionization losses, which produce a steep low energy cutoff; all particles below the cutoff are moved into the thermal ...
beryllium. and boron occurs because they are the spallation products of carbon. nitrogen. and oxygen which do occur with some abundance in the cosmic rays. Thus. as cosmic ray particles travel through the interstellar medium. the lighter elements of lithium. beryllium. and boron are cr...
indicates heavier elements at the highest energies beyond 109.3 GeV3,4,5,6,i.e., significantly heavier than helium and at most as heavy as iron. The study of interactions of nuclei is therefore critical for our understanding of cosmic ray astrophysics both within sources and during ...
1. The cosmic ray all particle spectrum (adapted studied by high ?ying balloon from Ref. [ 4]). Approximate integral ?uxes are indi- or satellite experiments. Such cated. measurements have provided important implications for the origin and transport properties of CRs in the interstellar medium...