40Ca(n, α)37Ar Reaction at 14.1 MeV

彭忠朝(Chung-Chaur Perng) ； 林松雲(Song-Yung Lin) ； 周木春(Muh-Chuen Chou) ； 許玉釧(Yi-Chuan Hsu) ； 黃振麟(Jenn-Lin Hwang) ； 許雲基(Yuin-Chi Hsu)

《Chinese Journal of Physics》 11卷2期 (1973/10) Pp. 119-129

並列摘要

Alpha particles produced by the interaction of 14.1MeV neutrons with 40Ca have been studied by using counter telescope technique.The well resolved groups of the alpha particles leading to 37Ar*=0, 1.41-1.61 and 2.22-3.52 MeV states were obtained. The strong forward peak in the angular distributions of these groups suggests a large contribution from direct reaction process, in contrast with the earlier investigations. The angular distribution of the ground state was analyzed with the incoherent combination of direct reaction process using DWBA method, and compound nucleus process by Hauser-Feshbach theory. The cross section of the ground state transition was found to be 1.7f0.2 mb, in which the contribution due to compound nucleus process was less than 12%.For the unresolved groups of the alpha particles, corresponding to the highly excited states of 37Ar the angular distribution is approximately symmetrical with respect to 90°, and is agreeable with the prediction of compound nucleus process. From the analysis of these groups, the level density parameter, nuclear temperature and spin cut-off parameter are evaluated.