Direct Observation of Competing M1 and M3 Transitions in ^{10}B

• Published in: Physical review letters Vol. 133; no. 7; p. 072502
• Main Authors: Kuşoğlu, A, Balabanski, D L, Hu, R Z, Fan, S Q, Xu, F R, Constantin, P, Söderström, P-A, Cuciuc, M, Aogaki, S, Ban, R S, Borcea, R, Coman, A, Corbu, R, Costache, C, Covali, A, Dinescu, I, Florea, N M, Iancu, V, Ionescu, A, Mărginean, N M, Mihai, C, Mihai, R E, Nedelcu, C V, Petruse, T, Pai, H, Pappalardo, A, Sirbu, O A, Sotty, C O, Stan, L, State, A N, Testov, D A, Tozar, T, Turturica, A, Turturica, G, Ujeniuc, S, Ur, C A, Vasilca, V, Zhu, F
• Format: Journal Article
• Language: English
• Published: United States 16.08.2024
• ISSN: 1079-7114
• DOI: 10.1103/PhysRevLett.133.072502

Excited states in ^{10}B were populated with the ^{10}B(p,p^{'}γ)^{10}B^{*} reaction at 8.5 MeV and their γ decay was investigated via coincidence γ-ray spectroscopy. The emitted γ rays were measured using large-volume LaBr_{3}:Ce and CeBr_{3} detectors placed in anti-Compton shields. This allowed the observation of weak γ-ray transitions, such as the M3 transition between the J^{π},T=0^{+},1 isobaric analog state (IAS) and the J^{π},T=3^{+},0 ground state and the E2 transition between the J^{π},T=2_{1}^{+},0 state and the IAS, i.e., performing measurements of branching ratios at the level of λ≥10^{-4}. For the first time in ^{10}B, the competing M1 and M3 transitions from the decay of the IAS have been observed in a γ spectroscopy experiment. The experimental results are compared with ab initio no-core shell model calculation using the newest version of the local position-space chiral N^{3}LO nucleon-nucleon interaction. The calculations reproduce correctly the ordering of the bound states in ^{10}B, and are in reasonable agreement with the observed branching ratios and reduced transition probabilities.