Gamow-Teller Transitions Ruling the Supernova Explosion
伽莫夫泰勒跃迁决定超新星爆炸
基本信息
- 批准号:15540274
- 负责人:
- 金额:$ 2.24万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2003
- 资助国家:日本
- 起止时间:2003 至 2005
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In the core-collapse stage of type II supernovae, weak-interaction processes of pf-shell nuclei play important roles. Therefore, studies of electron capture and beta decay caused by charged currents and neutrino-nucleus scattering caused by neutral currents are of great astrophysical interest. The charged-current processes are dominated by Fermi and Gamow-Teller (GT) transitions, but the knowledge for the important GT transitions in pf-shell nuclei is very poor. Direct information on the GT transition strength B(GT) can be derived from beta-decay measurements. However, B(GT) values were derived for at most a few low-lying states with large ambiguities.Charge-exchange (CE) reactions can access to GT transitions at higher excitations. In particular, it was shown that measurements at scattering angles around 0 deg and at intermediate beam energies above 100 MeV/nucleon were good probes of GT transitions. A development in precise beam matching techniques realized an energy resolution of about 30 keV in intermediate energy (311e, t) reactions at 0 deg. With this one-order of magnitude better resolution, we can now study GT and Fermi states that were unresolved in the pioneering (p, n) reactions. We performed experiments on T=1 targets 46Ti, 50Cr, 54Fe, and Ni isotopes 58Ni, 6ONi, 62Ni, and 64 Ni, and some additional reference nuclei. The B(GT) values have been extracted for some of the nuclei. The obtained strength distributions were compared with results of theoretical calculations. It was found that the modern shell-model calculations can reproduce the gross features of the distribution, but not the details.We plan to extend studies for a wider range of pf-shell nuclei, and the results will put restrictions on the theoretical studies of supernova explosion and also for the element synthesis.
在II型超新星的核心坍缩阶段,pf壳核的弱相互作用过程起着重要的作用。因此,研究带电电流引起的电子俘获和β衰变以及中性电流引起的中微子-核散射具有重要的天体物理意义。荷电过程主要由费米和伽莫夫-特勒(GT)跃迁所控制,但对pf壳层核中重要的GT跃迁的认识却很薄弱。关于GT转变强度B(GT)的直接信息可以从β衰变测量中导出。然而,B(GT)值只能在几个低激发态得到,并且有很大的不确定性。特别是,研究表明,在0度左右的散射角和高于100 MeV/核子的中间束能量下进行测量是GT跃迁的良好探针。精确束匹配技术的发展实现了在0 ℃下中能(311 e,t)反应中约30 keV的能量分辨率。有了这个一个数量级的更好的分辨率,我们现在可以研究GT和费米状态,在开创性的(p,n)反应中没有解决。我们对T=1靶46 Ti、50 Cr、54 Fe和Ni同位素58 Ni、6 ONi、62 Ni和64 Ni以及一些额外的参考核进行了实验。提取了某些核的B(GT)值。所得强度分布与理论计算结果进行了比较。结果表明,现代壳层模型计算只能再现pf壳层核分布的总体特征,而不能再现其细节,我们计划将研究范围扩大到更广泛的pf壳层核,其结果将对超新星爆发的理论研究和元素合成产生限制。
项目成果
期刊论文数量(41)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Y.Fujita, I.Hamamoto et al.: "Evidence for the Existence of the [202]3/2 Deformed Band in Mirror Nuclei ^<25>Mg and ^<25>Al"Physical Review Letters. 92. 062502-1-062502-4 (2004)
Y.Fujita、I.Hamamoto 等人:“镜核 ^<25>Mg 和 ^<25>Al 中存在 [202]3/2 变形带的证据”物理评论快报。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
High-resolution study of Gamow-Teller transitions from the Tz=1 nucleus 46Ti to the Tz=0 nucleus 46V
从 Tz=1 核 46Ti 到 Tz=0 核 46V 的 Gamow-Teller 跃迁的高分辨率研究
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:Akio Hosoya;Thomas Buchert;Masaaki Morita;細谷 暁夫;T.Adachi et al.
- 通讯作者:T.Adachi et al.
Y.Shimbara, Y.Fujita et al.: "Versatile Production Method of Thin Targets Supported by PVA"Nuclear Instruments and Methods in Physics Res.A. (accepted). (2004)
Y.Shimbara、Y.Fujita 等:“PVA 支持的薄靶材的多功能生产方法”物理研究中的核仪器和方法。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Suppression of Gamow-Teller and Ml Transitions in Deformed Mirror Nuclei 25Mg and 25Al
变形镜核 25Mg 和 25Al 中 Gamow-Teller 和 Ml 跃迁的抑制
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:Y.Fujiwara;C.Nakamoto;M.Kohno;Y.Suzuki;K.Miyagawa;小玉英雄;S.Banerjee et al.;Tomoaki Nagasawa;Y.Shimbara et al.
- 通讯作者:Y.Shimbara et al.
Level widths of 14O states studied in the high-resolution 14N(3He,t) 14O reaction
高分辨率 14N(3He,t) 14O 反应中研究的 14O 态能级宽度
- DOI:
- 发表时间:2005
- 期刊:
- 影响因子:0
- 作者:A.Negret;G.P.A.Berg;D.DeFrenne;Y.Fujita et al.
- 通讯作者:Y.Fujita et al.
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FUJITA Yoshitaka其他文献
FUJITA Yoshitaka的其他文献
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{{ truncateString('FUJITA Yoshitaka', 18)}}的其他基金
Weak interaction processes in nuclei studied by means of strong interaction
通过强相互作用研究原子核中的弱相互作用过程
- 批准号:
22540310 - 财政年份:2010
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Study of Gamow-Teller Transitions Playing Important Roles In the Neutrino Nucleosynthesis
伽莫夫-泰勒跃迁在中微子核合成中发挥重要作用的研究
- 批准号:
18540270 - 财政年份:2006
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Development of a crystal installing SQUID's for the detection of charged particles
开发安装 SQUID 的晶体,用于检测带电粒子
- 批准号:
02804011 - 财政年份:1990
- 资助金额:
$ 2.24万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)