| Issue |
EPJ Web Conf.
Volume 271, 2022
HYP2022 - 14th International Conference on Hypernuclear and Strange Particle Physics
|
|
|---|---|---|
| Article Number | 01009 | |
| Number of page(s) | 4 | |
| Section | Production, Structure and Decay of S=-1 Hypernuclei | |
| DOI | https://doi.org/10.1051/epjconf/202227101009 | |
| Published online | 09 November 2022 | |
https://doi.org/10.1051/epjconf/202227101009
Feasibility study for measurement of beta-decay rates of Λ hypernuclei
1 Department of Physics, Tohoku University, Sendai, 980-0845, Japan
2 Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, 319-1184, Japan
* Email: kamada@lambda.phys.tohoku.ac.jp
Published online: 9 November 2022
The baryon structure may be modified in nuclear medium. The quark meson coupling model predicts that the beta decay rate of a Λ hyperon in Λ hypernuclei decreases by 20% at maximum. We propose an experiment to precisely measure the beta-decay rate of 5ΛHe at J-PARC via the (π+, K+) reaction. A feasibility study via GEANT4 simulation has been done, showing that the background can be suppressed down to ~ 3.9% of the betadecay electron yield, using a calorimeter covering the whole solid angle around the target. The measurement of the beta-decay of a Λ in a nucleus is found to be feasible.
© The Authors, published by EDP Sciences, 2022
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