Measurement of spinflip probability and spin giant resonance

自旋翻转概率和自旋巨共振的测量

基本信息

批准号：
10044058
负责人：
SAKAI Hideyuki
金额：
$ 2.3万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

The initial intention of this research was two fold 1) search for the isoscalar spin giant reso-nance through the (d, d'γ) reaction and 2) study of ィイD13ィエD1He-N effective interactions through (ィイD13ィエD1He,tγ) reaction. Since this proposal has been approve as the 2-year term and with large. budget cut to half, we adjusted our plan and we decided to pursue the second subject, namely the spinflip measurement of the ィイD126ィエD1Mg(ィイD13ィエD1He,tγ) ィイD126ィエD1Al[1ィイD1+ィエD1 ; 1.06 MeV] reaction at 178 MeV.The experiments were performed two times (December, 1998 and November 1999) at KVI, Groningen University, The Netherlands by using the AGOR cyclotron and BBS spectrometer system.The following data have been obtained :1. The elastic scattering for the ィイD126ィエD1Mg(ィイD13ィエD1He, ィイD13ィエD1He) ィイD126ィエD1Mg at 178 MeV has been measured at θィイD2labィエD2 = 9° - 42° to extract the optical potential parameters, which is needed for the later DWBA analysis.2. The differential cross sections for the Gamow-T … More eller transition to the 1ィイD1+ィエD1 state at 1.06 MeV in ィイD126ィエD1Al have been measured for the ィイD126ィエD1Mg(ィイD13ィエD1He, t ) ィイD126ィエD1Al reaction at 178 MeV atθィイD2labィエD2 = 0° - 30°. Obtained angular distribution will be used for the later DWBA analysis.3. Coincidence measurement has been performed for the ィイD126ィエD1Mg(ィイD13ィエD1He, tγ)ィイD126ィエD1Al[1ィイD1+ィエD1 ; 1.06 MeV] reaction at 178 MeV. The spinflip probability has deduced for θィイD2c.m.ィエD2 = 0.3° - 3.8°as 0.55 - 0.65.4. The DWBA analyses are carried out by using the optical potential, ィイD13ィエD1He-N effective interac-tions and Brown-Wildenthal shell model wave functions. It turns out that the calculation underpredicts largely the measured spinflip probabilities. This fact clearly indicates the deficiency of the ィイD13ィエD1He-N effective interactions.This project has been completed very smoothly with fruitful results. Finally this is the first spinflip measurement for the (ィイD13ィエD1He, t ) reaction at intermediate energies and thus it bears very precious information regarding 3He spin-interactions. Less

这项研究的初衷有两个：1) 通过 (d, d'γ) 反应寻找等标量自旋巨共振；2) 研究预算削减一半，我们调整了计划，决定进行第二个课题，即旋转翻转测量。 178 MeV 下的 D126D1Mg(D13D1He,tγ) D126D1Al[1D1+D1; 1.06 MeV] 反应。实验在荷兰格罗宁根大学 KVI 进行了两次（1998 年 12 月和 1999 年 11 月），使用 AGOR 回旋加速器和论坛获得了以下数据： 1. 在 θD2 = 9° - 42° 处测量了 D126D1Mg(D13D1He, D1He) D126D1Mg 在 178 MeV 处的弹性散射，以提取光学势参数。后来的DWBA分析.2. 在 178 MeV 下测量了 D13D1He, t) D126D1Al 反应在 D126D1Al 中在 1.06 MeV 下向 1D1+D1 态的 Gamow-T … More 埃勒跃迁的微分截面atθD2labD2 = 0° - 30°。获得的角分布将用于后面的 DWBA 分析。3. 对 178 处的 D126D1Mg(D13D1He, tγ )IID126IeD1Al[1IiD1+IeD1] 进行了符合测量。 MeV。通过使用光学势、D13D1He-N 有效相互作用和 Brown-Wildenthal 壳层，推导出 θD2c.m.D2 = 0.3° - 3.8° 的自旋翻转概率为 0.55 - 0.65.4。事实证明，计算很大程度上低估了测量的自旋翻转概率。这一事实清楚地表明了D13D1He-N有效相互作用的不足。该项目非常顺利地完成，并取得了丰硕的成果。最后，这是第一次对中间能量的(D13D1He, t )反应进行自旋翻转测量，因此它具有非常宝贵的信息。 3他自旋相互作用较少。