| Budget Amount *help |
¥41,990,000 (Direct Cost: ¥32,300,000、Indirect Cost: ¥9,690,000)
Fiscal Year 2018: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥12,480,000 (Direct Cost: ¥9,600,000、Indirect Cost: ¥2,880,000)
Fiscal Year 2016: ¥12,610,000 (Direct Cost: ¥9,700,000、Indirect Cost: ¥2,910,000)
Fiscal Year 2015: ¥12,610,000 (Direct Cost: ¥9,700,000、Indirect Cost: ¥2,910,000)
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| Outline of Final Research Achievements |
This subject aims at precisely measuring γ-rays in 4ΛHe and 4ΛH hypernuclei and comparing their level structure to clarify a possible large charge symmetry breaking (CSB) effect in light Λ hypernuclei suggested by old experiments. We carried out a 4ΛHe experiment and oberved a γ-ray at 1.406 MeV. It is much larger than the corresponding energy for 4ΛH, 1.09 MeV. Thus we clearly confirmed the existence of a very large CSB effect. In order to measure the 4ΛH γ-ray again but much precisely with a new beam line at J-PARC, we have developed all the detectors including a new fiber tracking detector and made the experiment ready to run.
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