| Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
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| Outline of Final Research Achievements |
In order to clarify the interaction between Λ particles and nucleons, which is not well understood, we aim to determine the scattering length and effective range of Λ and neutron (n) with high accuracy, which have not been measured so far. In order to carry out the experiment, we have upgraded the NKS2 spectrometer, which has been used for the experiments on strangeness photoproduction reactions with real photon beams at the Research Center for Electron Photon Science, Tohoku University. We have collected data and are analyzing the data. In addition, we have performed a Λnn bound state search experiment with a tritium target at the Jefferson Laboratory in the USA. We obtained an upper limit on the production cross section and that provides a theoretical limit on the Λnn interaction.
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