Study of Decay Modes from Nuclear Deep Hole States
核深孔态衰变模式的研究
基本信息
- 批准号:09440105
- 负责人:
- 金额:$ 8.19万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:1997
- 资助国家:日本
- 起止时间:1997 至 1998
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Nuclear hole states have provided direct evidence of the existence of inner orbital shell structure in nucleus. However, we did not have rich information on the decay modes of the highly excited deep-hole states whether the spreading width dominates or there exists the large escape width, until now. Nuclear deep hole states also have a close connection with the structure and decay of hypernuclei and are relevant to the nucleon decay measurement with the water Cerenkov Detector.After we developed the thin ィイD116ィエD10 target (a pair of SiOィイD22ィエD2 and Si of 2 mg/cmィイD12ィエD1) and a Peltier cooling system, we have measured the ィイD112ィエD1C(p,2p)ィイD111ィエD1BィイD1*ィエD1 and ィイD116ィエD1O(p,2p)ィイD115ィエD1NィイD1*ィエD1 reaction at EィイD2pィエD2 = 392 MeV together with decay charged particles (p,d,t and α) from s-hole states in ィイD111ィエD1B and ィイD115ィエD1N (A new experimental proposal on the neutron and γ decay has just approved as well.) The experiment has been performed at the Research Center for Nuclear Physics, Osaka University, using the double-arm spectrometer and ΔE-E SSD-ball telescope.α decay probabilities have been found to be suppressed in both s-hole states in spite of their large Q-values. Our results of decay branching ratios can not be reproduced by the statistical model calculation but are qualitatively consistent with the calculation of the microscopic cluster model assuming the decay from the doorway s-hole states. The excitation energy spectra around s-hole states show two or three bump structures, which suggests that the s-hole states split into some different components.
核空穴态为原子核内轨道壳结构的存在提供了直接证据。然而,关于高激发态深空穴态的衰变模式是否以扩展宽度为主或是否存在大逃逸宽度,到目前为止还没有丰富的信息。核深空穴态也与超核的结构和衰变密切相关,并与用水切伦科夫探测器测量核子衰变有关。在我们开发了薄ィイD116ィエD10靶(一对SiOィイD22ィエD2和2 mg/cmィイD12ィエD1的硅)和帕尔蒂埃冷却系统后,我们测量了ィイD112ィエD1C(p,2p)ィイD111ィエD1BィイD1*ィエD1和ィイD116ィエD10(p,2p)ィイD115ィエD1NィイD_1*ィエD_1在E_ィイ_D_2P_ィエ_2=392 MeV时与来自S空穴态的衰变带电粒子(p、d、t和α)一起在ィイD111ィエD_1B和ィイ_D115_ィエD_1N中发生反应(关于中子和γ衰变的新实验方案也得到了批准)。这项实验是在大阪大学核物理研究中心用双臂能谱仪和ΔE-E固体遮盖球望远镜进行的,发现α衰变几率在两个S空穴态下都是被抑制的,尽管它们的Q值很大。我们的衰变分支比的计算结果不能被统计模型计算重现,但与假定从门口S空穴态衰变的微观团簇模型的计算定性地一致。S空穴态周围的激发能谱显示出两个或三个凸起结构,这表明S空穴态分裂成一些不同的分量。
项目成果
期刊论文数量(17)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
M. Yosoi et al.: "Giant Resonance Study by Proton and Alpha Inelastic Scattering at and near zero degrees at RCNP"Riken Review. 23. 168-171 (1999)
M. Yosoi 等人:“RCNP 零度及附近质子和阿尔法非弹性散射的巨型共振研究”Riken Review。
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- 影响因子:0
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T.Noro 他: "NN Interactions in Nuclear Fields Studied by (p,2p) Reactions?" Proceedings of the 8th International Symposium on “New Facet of Spin-Giant Resonances in Nuclei"(Tokyo), edited by H.Sakai他. 378-390 (1998)
T. Noro 等人:“通过 (p,2p) 反应研究核场中的 NN 相互作用?”第八届“原子核自旋巨共振的新方面”国际研讨会论文集(东京),H. Sakai 编辑等人,378-390(1998)
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- 影响因子:0
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T.Noro、他: "A Study of Nucleon Properties in Nuclei through (p,2p)Reactions"Nuclear Physics A. 629. 324c-333c (1998)
T. Noro 等人:“通过 (p,2p) 反应研究原子核中的核子性质”核物理 A. 629. 324c-333c (1998)
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- 影响因子:0
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T. Noro et al.: "A Study of Nucleon Properties in Nuclei through (p, 2p) Reactions"Nuclear Physics A. 629. 324c-333c (1998)
T. Noro 等人:“通过 (p, 2p) 反应研究原子核中的核子性质”核物理 A. 629. 324c-333c (1998)
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- 影响因子:0
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M. Yosoi et al.: "Particle Decays from the Deep-Hole States in Light Nuclei"Proc. Workshop. On Frontiers in Nuclear Physics. (to be finished). (2000)
M. Yosoi 等人:“轻核深洞态的粒子衰变”Proc。
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YOSOI Masaru其他文献
YOSOI Masaru的其他文献
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{{ truncateString('YOSOI Masaru', 18)}}的其他基金
Baryon spectroscopy studied by the photoproduction reaction with a polarized HD target
通过偏振高清目标的光产生反应研究重子光谱
- 批准号:
25400300 - 财政年份:2013
- 资助金额:
$ 8.19万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Search for the pentaquark-particle hypernuclei
寻找五夸克粒子超核
- 批准号:
18340064 - 财政年份:2006
- 资助金额:
$ 8.19万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Study of Nuclear Spin Excitations through All Polarization Transfer Measurements
通过全偏振转移测量研究核自旋激发
- 批准号:
07454051 - 财政年份:1995
- 资助金额:
$ 8.19万 - 项目类别:
Grant-in-Aid for Scientific Research (B)