arXiv · 2510.06575
Precise measurement of the $\gamma$-decay probability of the Hoyle state with a new triple coincidence-detection method
Abstract
We measured the $\gamma$-decay probability of the Hoyle state with a new method of triple coincidence detection of a scattered $\alpha$ particle, a recoil $\rm ^{12}C$ nucleus, and a $\gamma$ ray in inelastic alpha scattering on $\rm ^{12}C$. This method successfully enabled a low-background measurement and a precise determination of the $\gamma$-decay probability of the Hoyle state as $\Gamma_\mathrm{\gamma}/\Gamma=[4.00 \pm 0.22 \mathrm{(sta.)} \pm 0.18 \mathrm{(sys.)}]\times10^{-4}$, which is consistent with the previous literature value. Therefore, we concluded that the literature value can be reliably used in the study of nucleosynthesis in the universe.
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K. Sakanashi, T. Kawabata, S. Adachi, H. Akimune, S. Aogaki, D. L. Balabanski, S. R. Ban, R. Borcea, S. Călinescu, C. Clisu, R. Corbu, C. Costache, A. Covali, M. Cuciuc, A. Dhal, I. Dinescu, N. Florea, T. Furuno, I. Gheorghe, A. Ionescu, M. Itoh, S. Kubono, A. Kuşoğlu, Y. Matsuda, C. Mihai, R. E. Mihai, C. Neacsu, D. Nichita, R. Niina, S. Okamoto, H. Pai, T. Petruse, M. Sferrazza, O. Sîrbu, P-A. Söderström, A. Spătaru, L. Stan, A. Tamii, D. A. Testov, A. Turturica, G. Turturică, S. Ujeniuc, V. Vasilca. 2025-10-08. Precise measurement of the $\gamma$-decay probability of the Hoyle state with a new triple coincidence-detection method. https://doi.org/10.1016/j.physletb.2025.139893
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