Beta-decay of very neutron-rich nuclei relevant to nucleosynthesis

与核合成相关的高中子核的β衰变

• 批准号: 19340074
• 负责人: NISHIMURA Shunji
• 金额: $ 11.81万
• 依托单位: The Institute of Physical and Chemical Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19340074/
• 关键词: 元素合成; ベータ崩壊; 半減期; 不安定核; 超新星爆発; r過程; β崩壊; 中性子過剰核; R過程; R-過程; 半減期測定; beta-decay; Nuclear Structure; Astrophysics; Unstable nuclei

The beta-decay half-lives of 38 neutron-rich isotopes (18 for first time) from Kr to Tc, which play important role in the r-process nucleosynthesis, have been measured. The results when compared with previous standard models indicate the overestimation in the predicted half-lives by a factor of 2 or more in the A～110 region. The results suggest a more rapid flow of the rapid neutron capture process (r-matter flow) through this region around mass A=110～125 than previously predicted.

测量了在γ过程核合成中起重要作用的38个丰中子同位素（其中18个为首次测量）从Kr到Tc的β衰变半衰期。与以前的标准模型相比，结果表明，在A~110区域，预测半衰期高估了2倍或更多。结果表明，在质量A=110~125附近，快中子俘获过程（r-物质流）在该区域的流动比以前预测的要快。

项目成果

Single-particle resonanace levels in 140 examined by 13N + p elastic scattering

通过 13N p 弹性散射检查 140 中的单粒子共振水平

• 发表时间: 2007
• 期刊: Physic Letters B 650
• 作者: T.Teranishi;et. al.
• 通讯作者: et. al.

Spectroscopy of 32Ne and the "Island of Inversion".

• DOI: 10.1103/physrevlett.103.032501
• 发表时间: 2009-06
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: P. Doornenbal;H. Scheit;N. Aoi;S. Takeuchi;K. Li;E. Takeshita;H. Wang;H. Baba;S. Deguchi;N. Fukuda;H. Geissel;R. Gernhäuser;J. Gibelin;I. Hachiuma;Y. Hara;C. Hinke;N. Inabe;K. Itahashi;S. Itoh;D. Kameda;S. Kanno;Y. Kawada;N. Kobayashi;Y. Kondo;R. Krücken;T. Kubo;T. Kuboki;K. Kusaka;M. Lantz;S. Michimasa;T. Motobayashi;T. Nakamura;T. Nakao;K. Namihira;S. Nishimura;T. Ohnishi;M. Ohtake;N. Orr;H. Otsu;K. Ozeki;Y. Satou;S. Shimoura;T. Sumikama;M. Takechi;H. Takeda;K. Tanaka;K. Tanaka;Y. Togano;M. Winkler;Y. Yanagisawa;K. Yoneda;A. Yoshida;K. Yoshida;H. Sakurai

Development of wide-dynamic range readout system of silicon detector from 20keV to 4GeV

20keV至4GeV宽动态范围硅探测器读出系统的研制

• 发表时间: 2008
• 期刊: RIKEN Accel.Prog.Rep. 41
• 作者: N.Uematsu;S.Nishimura
• 通讯作者: S.Nishimura

Development of silicon-strip detector with wide-dynamic-range readout system from 20keV to 4GeV

开发具有20keV至4GeV宽动态范围读出系统的硅条探测器

• 发表时间: 2008
• 期刊: RIKEN Accel. Prog. Rep. 41
• 作者: N. Uematsu;S. Nishimura
• 通讯作者: S. Nishimura

Low-lying non-normal parity states in 8B measured by proton elastic scattering on 7Be

通过 7Be 上的质子弹性散射测量 8B 中的低位非正态宇称态

• 发表时间: 2009
• 期刊: Phys.Lett.B 672
• 作者: H. Yamaguchi;et al.;(15名;9番目)
• 通讯作者: 9番目)