Excitation Functions and Angular Distributions of the Reactions Al^<27>(p, α)Mg^<24> at 12.7〜14.1Mev and Cr^<52>(p, α)V^<49> at 9.0〜14.2Mev

概要

論文の詳細を見る
Making use of a proportional counter, alpha particles have been observed from the reactions Al^<27>(p, α)Mg^<24> resulting in the ground and first excited states of Mg^<24> and Cr^<52>(p, α)V^<49> resulting in the lowest three and a few higher states. Excitation curves have been measured at a laboratory angle of 50° with respect to the bombarding beam, from 12.7 to 14.1Mev for Al^<27>(p, α)Mg^<24> and from 9.0 to 14.8Mev for Cr^<52>(p, α)V^<49>. The former shows a sharp energy dependence, while the latter shows a fairly smooth structure. Angular distributions have been measured at 14.1, 13.0 and 12.8Mev for Al^<27>(p, α)Mg^<24> and at 14.2, 13.0, 12.0, 11.0, 10.0, 9.5 and 9.0Mev for Cr^<52>(p, α)V^<49>. Although the Al^<27>(p, α_0)Mg^<24> data can be partially fitted by [j_2(Q_<γ0>]^2 of Butler's theory, some angular distributions show strong backward peaking. Either interference between various direct interaction processes or between direct interaction and compound nuclear processes, or both are responsible for this reaction. The approximate 90° symmetry of Cr^<52>(p, α)V^<49> angular distribution does not appear to be inconsistent with the statistical theory of nuclear reactions. However, the conspicuous forward peak at higher energies, especially at 14.2Mev, is considered to indicate the increasing contribution of direct interaction processes.
社団法人日本物理学会の論文
1959-06-05