2010 Fiscal Year Final Research Report
Beta-decay of very neutron-rich nuclei relevant to nucleosynthesis
| Project/Area Number |
19340074
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | The Institute of Physical and Chemical Research |
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Principal Investigator |
NISHIMURA Shunji The Institute of Physical and Chemical Research, 櫻井RI物理研究室, 先任研究員 (90272137)
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| Project Period (FY) |
2007 – 2010
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| Keywords | 元素合成 / ベータ崩壊 / 半減期 / 不安定核 / 超新星爆発 / r過程 |
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| Research Abstract |
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.
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