| タイトル | On the importance of interstellar helium for the propagation of heavy cosmic rays |
| 本文（外部サイト） | http://hdl.handle.net/2060/19850026566 |
| 著者（英） | Soutoul, A.; Ferrando, P.; Goret, P. |
| 著者所属（英） | Commissariat a l'Energie Atomique |
| 発行日 | 1985-08-01 |
| 言語 | eng |
| 内容記述 | The influence of interstellar He on the fragmentation of heavy cosmic rays in the interstellar medium (ISM) has long been a controversial subject. While H-induced cross section data are now avialable over broad mass and energy ranges, little data for He-induced fragmentation exists. With the recent reports of accurate measurements of the secondary/primary ratios in cosmic rays and of H-induced cross sections the problem of including interstellar He in propagation calculations becomes even more critical. As is argued the escape lengths lambda e deduced from the B/C+) and Sc-Cr/Fe ratios cannot be reconciled within the frame of a simple leaky box model assuming the ISM composed of pure H. It is quite remarkable that the discrepancy is especially large in the GeV region where (1) secondary/primary ratios measured by several groups agree fairly well and (2) fragmentation cross sections have been recently measured with good accuracy. |
| NASA分類 | SPACE RADIATION |
| レポートNO | 85N34879
OG-7.2-11 |
| 権利 | No Copyright |
