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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

本研究的最初目的有两个：1）通过（d，d 'γ）反应寻找等标自旋巨共振; 2）通过（イD13 D1 He，tγ）反应研究イD13 D1 He-N有效相互作用。由于该提案已被批准为2年任期，并与大。由于预算减少了一半，我们调整了计划，决定继续进行第二个课题，即对D126型自行车D1 Mg的自旋翻转测量（γ-D13-D1He，tγ）γ-D126-D1Al[1-D1+ D1]; 1.06 MeV]反应。实验进行了两次（1998年12月和1999年11月）在荷兰格罗宁根大学的KVI实验室，利用AGOR回旋加速器和BBS谱仪系统，获得了以下数据：1.测量了178 MeV的氘氚D126氘氚D1 Mg（氘氚D13氘氚D1 He，氘氚D13氘氚D1 He）氘氚D126氘氚D1 Mg在θ = 10 ° - 42°的弹性散射，提取了光学势参数，为后续的DWBA分析提供了必要的参数. Gamow-T的微分截面 ...更多信息在178 MeV，θ_（12）D_（13）He_（13）D_（12）He_（13）D_（12）Al反应中，测量了1.06MeV下He_（13）D_（12）Al到1 π π D_（1 + 1 π D_（1）态的埃勒跃迁.所得到的角分布将用于后面的DWBA分析.在178 MeV下对氘代D126氘代D1 Mg（氘代D13氘代D1 He，tγ）氘代D126氘代D1 Al [1氘代D1+氘代D1 ; 1.06MeV]反应进行了符合测量。推导出θ ψ D2 c. m. ψ D2 = 0.3° - 3.8°时的自旋翻转概率为0.55 - 0.65.4。用光学势、D_13、D_1He-N有效相互作用和Brown-Wildenthal壳模型波函数进行了DWBA分析。事实证明，这种计算大大低估了测量到的自旋翻转概率。这一事实清楚地表明了氘代D13氘代D1 He-N有效相互作用的不足。最后，这是第一次在中等能量下对（3 He D13）D1 He，t）反应的自旋翻转测量，因此它承载了关于3 He自旋相互作用的非常宝贵的信息。少