| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2019: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2018: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
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| Outline of Final Research Achievements |
We performed high precision spectroscopy of Lambda hypernuclei with the mass number less than 10 at Jefferson Lab which provides high quality electron beams. A system of two neutrons and a Lambda (nn-Lambda) was searched for, but no clear evidence of its existence was observed. However, the experimental data would be useful to derive the unknown Lambda-n interaction. In addition, a neutron-rich Lambda hypernucleus, Lambda-hyperlithium-9 was successfully measured with an excellent resolution of 1.3 MeV in FWHM, and the result indicates unexpectedly large effect of charge symmetry breaking (CSB) in the A = 9 system. A plan to measure Lambda-hyperhydrogen-3 and -4 which are of great importance to study CSB was approved by JLab Program Advisory Committee.
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