| Project/Area Number |
19740151
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Japan Atomic Energy Agency |
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Principal Investigator |
KOURA Hiroyuki Japan Atomic Energy Agency, 先端基礎研究センター, 研究副主幹 (50391264)
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥2,830,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥330,000)
Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2008: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2007: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | 原子核理論 / 超重核 / 原子核質量 / 原子核崩壊 / r過程元素合成 / 理論核物理 / 原子核崩壞 |
|---|
| Research Abstract |
Total half-lives of nuclei in the whole nuclear mass region are obtained from four nuclear decay modes : alpha-decay, beta-decay, proton emission and spontaneous fission, which are estimated from theoretical nuclear ground-state masses of a global nuclear mass model, the KTUY (Koura-Tachibana-Uno-Yamada) mass formula. Number of nuclei with total half-lives of 1 nanosecond or longer is estimated to be approximately eleven thousands, that with half-lives of 1 second or longer is approximately four thousand, and so on. A area of existence of nuclei is also estimated to extend up to 170-180 of proton number and 330 of neutron number. We confirm a finiteness of the area of nuclei with certain lives in the chart of the nuclides.
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