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FIELDS, PARTICLES, AND NUCLEI
Formation of $^8$He in the $^9$Be$(\pi^-,p)X$ and $^{10}$B$(\pi^-,pp)X$ stopped pion absorption reactions
Yu. B. Gurovab, S. V. Lapushkina, T. I. Leonovaa, V. G. Sandukovskyb, M. V. Tel'kusheva, B. A. Chernysheva a National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, 115409 Russia
b Joint Institute for Nuclear Research, Dubna, Moscow region, 141980 Russia
Abstract:
The structure of levels of the $^8$He heavy helium isotope has been studied in the $^9$Be$(\pi^-,p)X$ and $^{10}$B$(\pi^-,pp)X$ stopped pion absorption reactions. Measurements have been performed with a two-arm multilayer semiconductor spectrometer at the LANL. Indications to the existence of a soft dipole mode at the excitation energy $E_x \approx 3$ MeV have been obtained. A state with a high excitation energy of $12.2(5)$ MeV has been observed for the first time.
Received: 07.12.2020 Revised: 30.12.2020 Accepted: 30.12.2020
Citation:
Yu. B. Gurov, S. V. Lapushkin, T. I. Leonova, V. G. Sandukovsky, M. V. Tel'kushev, B. A. Chernyshev, “Formation of $^8$He in the $^9$Be$(\pi^-,p)X$ and $^{10}$B$(\pi^-,pp)X$ stopped pion absorption reactions”, Pis'ma v Zh. Èksper. Teoret. Fiz., 113:3 (2021), 147–151; JETP Letters, 113:3 (2021), 135–139
Linking options:
https://www.mathnet.ru/eng/jetpl6350 https://www.mathnet.ru/eng/jetpl/v113/i3/p147
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