Spin Excitations in Nuclei

原子核中的自旋激发

• 批准号: 08044085
• 负责人: EJIRI Hiroyasu
• 金额: $ 3.33万
• 依托单位: Research Center for Nuclear Physics (RCNP), Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044085/
• 关键词: Sun; Neutrino; Gamow-Teller Resonance; Spin Dipole Resonance; Giant Resonances; gamma-rays; (^3He, t) reactions; Silicon Detectors; スピン・ダイボール共鳴; シリコン・ポール検出器; スピンアイソスピン共鳴; 陽子崩壊; 中性子崩壊; ガンマ線崩壊; 水素標的; 原子核のミクロ構造

We studied the techinical problems to measure proton and neutrom decays followtng the (^3He, t) reactions at 450 MeV.The data taking system was greatly inproved. The coincidence technique using multe silicon- and neutron- detectors has been developed for the neutron and proton decays in coincidence with the focal plane detector system of the spectrometer "Grand Raiden". The following subjects were studied in this fiscal year ;1.Nuclear spin giant resonances via charge exchange reactions.2.Particle decays from the mirror ^<12>N and ^<12>B nuclei.3.Solar neutrinos and ^<176>Yb(^3He, t) reaction.4.gamma-ray production mechanism in proton-proton collision.5.Neutrino absorption cross section of ^<71>Ga6.Nuclear Structure of mirror sysmetry nuclei via the (^3He, t) and (t, ^3He) reactions.7.Neutrinos and Nuclear spin responses.As the next subject, we prepare some new experiments at KVI and RCNP.Sophisticated theoretical calculations in understanding the proton and neutron decays from the spin excitations in nuclei have started.

研究了450 MeV下(^3He,t)反应测量质子和中子衰变的技术问题，对数据采集系统进行了很大改进。使用多硅和中子探测器的符合技术已经开发出来，用于与光谱仪“Grand Raiden”的焦平面探测器系统相一致的中子和质子衰变。本财年研究了以下课题；1.通过电荷交换反应进行的核自旋巨共振。2.镜子^<12>N和^<12>B核的粒子衰变。3.太阳中微子和^<176> Yb(^3He, t)反应。4.质子-质子碰撞中伽马射线产生机制。5.^<71>Ga6的中微子吸收截面。核通过 (^3He, t) 和 (t, ^3He) 反应形成镜像核的结构。7.中微子和核自旋反应。作为下一个主题，我们在 KVI 和 RCNP 准备一些新的实验。复杂的理论计算有助于理解原子核中自旋激发引起的质子和中子衰变已经开始。

项目成果

M.Fujiwara, I.Daito, H.Fujimura, H.Akimune, T.Inomata, F.Ihara, K.Ishibashi: "Spin-isospin giant resonances by charge exchange reactions" Acta Physica Polonica B. (to be published.).

M.Fujiwara、I.Daito、H.Fujimura、H.Akimune、T.Inomata、F.Ihara、K.Ishibashi：“电荷交换反应的自旋-同位旋巨共振”Acta Physica Polonica B.（待出版）

H.Akimune, H.Ejiri, 他: "GT Strengths Studied by (^3He,t) Reactions and Nuclear Matrix Elements for Double Bete Decays" Phys.Lett.B. 394. 23-28 (1997)

H.Akimune、H.Ejiri 等人：“通过 (^3He,t) 反应和核基质元素研究双贝特衰变的 GT 强度”Phys.Lett.B. 394. 23-28 (1997)

R.De Leo,M.Fujiwara et al.,: "Isospin Character of Low-Lying States in ^Fe" Phys.Rev.C53. 2718-2731 (1996)

R.De Leo、M.Fujiwara 等人：“^<56>Fe 中低位态的同位旋特征”Phys.Rev.C53。

T.Yamaya,M.Fujiwara,et al.,: "α-cluster states aboce the threshold energy in ^Ti" Phys.Rev.C53. 131-136 (1996)

T. Yamaya、M. Fujiwara 等人：“α 团簇状态高于 ^<44>Ti 中的阈值能量”Phys.Rev.C53 (1996)。

T.Inomata, H.Akimune, I.Daito, H.Ejiri, H.Fujimura, M.Fujiwara, M.N.Harakeh, K.Ishibashi, H.Kohri, N.Matsuoka, S.Nakayama, A.Tamii, M.Tanaka, H.Toyokawa, M.Yoshimura, and M.Yosoi: "Particle decays from ^B and ^N mirror nuclei" Phys.Rev.C. in press

T.Inomata、H.Akimune、I.Daito、H.Ejiri、H.Fujimura、M.Fujiwara、M.N.Harakeh、K.Ishibashi、H.Kohri、N.Matsuoka、S.Nakayama、A.Tamii、M.Tanaka