Measurement of spinflip probability and spin giant resonance

自旋翻转概率和自旋巨共振的测量

• 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
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10044058/
• 关键词: Spinflip probability; Spin giant resonance; Bohr theorem; Gamow-Teller transition; Effective interaction; ガモフテラー型遷移; ガモフテラー型ベータ崩壊; 磁気スペクトロメータ

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

这项研究的初衷是两个方面：1)通过(d，d‘γ)反应寻找等标量自旋巨共振；2)通过(ィイD13ィエD1He，tィイ)反应研究ィエD13 D1He-N有效相互作用。由于这项提案已获批准，任期为2年，并具有较大的影响力。预算削减了一半，我们调整了计划，决定进行第二个主题，即ィイD126ィエD1 MG(ィイD13ィエD1he，tγ)ィイD126ィエD1Al[1ィイd1+ィエd1；在1998年12月和1999年11月在荷兰格罗宁根大学的KVI用AGOR回旋加速器和BBS能谱仪系统进行了两次实验，获得了以下数据：1.在ィイD2LabィエD2=9°-42°下测量了ィイD126ィエD1He(ィイD13ィエD1He)ィイD126ィエD1 Mg在178 MeV的弹性散射，以提取光学势能参数，为以后的DWBA分析提供了所需的光学势参数。伽莫夫-T…的微分截面在1.06 MeV的ィイD126ィエD1Al中，ィイD126ィエD1 Mg(ィイD13ィエD1He，t)ィイD126ィエD1Al反应在178 MeV的ィイD2LabィエD2=0°-30°的θィイD126ィエD1Al态有更多的Eller跃迁。得到的角度分布将用于后面的DWBA分析。在178 MeV下，对ィイD126ィエD_1 Mg(ィイD_(13)ィエD_1He，tγ)ィイD_(126)ィエD_1Al[1ィイD_1+ィエD_1；1.06 MeV]反应进行了符合测量。推导了θィイD2c.m的自旋翻转概率。ィエD2=0.3°-3.8°AS 0.5 5-0.6 5.4。用光学势、ィイD13ィエD1He-N有效相互作用和布朗-威尔登塔尔壳模型波函数进行了波束理论分析。事实证明，该计算在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ィイD13ィエD1He-N有效相互作用的不足。该项目已经非常顺利地完成，并取得了丰硕的成果。最后，这是(ィイD13ィエD1He，t)反应在中能下的第一次自旋翻转测量，因此它包含了关于3He自旋相互作用的非常宝贵的信息。较少

项目成果

Y. Satou et al.: "Study of isoscalar spinstrength via the <@D112@>D1(d,d') reaction"Nucl. Phys.. A649. 275-278 (1999)

Y. Satou 等人：“通过 <@D112@>D1(d,d) 反应研究等标量自旋强度”Nucl。

T. Suguki & H. Sakai: "The Landau-Migdal parameter, g<@DNN@>D2 and g<@DN@>D2"Phys. Lett. B. 455. 25-29 (1999)

T·杉木

Y. Satou et al.: "Study of isoscalar spin strength via the ィイD112ィエD1C(d, d') reaction"Nucl. Phys.. A649. 275c-278c (1999)

Y. Satou 等人：“通过 D112D1C(d, d) 反应研究等标量自旋强度”Nucl. Phys.. A649。

T. Uesaka et al.: "Polarization correlation coefficient for the ィイD13ィエD1He(d, p) ィイD14ィエD1He reaction"Phys. Lett. B. B467. 199-204 (1999)

T. Uesaka 等人：“D13D1He(d, p) D1He 反应的偏振相关系数”Phys Lett. 199-204。

Ed. by H. Sakai et al.: "Nuclear Responses and Medium Effects"Universal Academy Press, Frontiers Science Series No. 28. (1999)

埃德。