| Budget Amount *help |
¥44,850,000 (Direct Cost: ¥34,500,000、Indirect Cost: ¥10,350,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥12,740,000 (Direct Cost: ¥9,800,000、Indirect Cost: ¥2,940,000)
Fiscal Year 2013: ¥25,480,000 (Direct Cost: ¥19,600,000、Indirect Cost: ¥5,880,000)
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| Outline of Final Research Achievements |
High efficiency γ-ray detectors (Cluster Germanium detector) and β-ray detectors were introduced to investigate the role of the neutron-rich nuclei in the rapid-neutron capture process (r process) nucleosynthesis. In total, 234 β-decay half-lives were measured successfully during this research program. We found that newly measured 122 β-decay half-lives play important role in the determination of the shape of 1st and 2nd peaks of r-process elements. In addition, our results reduce the uncertainty of synthesis in the formation of heavier rare-earth elements. The neutron magic number N = 50 and 82 were investigated by studying the systematics of β-decay half-lives and excited states of 78Ni and 128Pd, respectively. The results suggest that neutron shell closure at N = 50 and 82 are still robust for such very neutron-rich nuclei.
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