γ-ray spectroscopic study of self-conjugate ¹⁰B nucleus with inelastic proton scattering

¹ Extreme Light Infrastructure-Nuclear Physics (ELI-NP), Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, 077125 Bucharest-Ma˘gurele, Romania
² Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, 34134 Istanbul, Turkey
³ School of Physics, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
⁴ Department of Nuclear Physics, Horia Hulubei National Institute for Physics and Nuclear Engineering, 30 Reactorului Street, Bucharest-Măgurele 077125, Romania
⁵ Institute of Experimental and Applied Physics, Czech Technical University in Prague, Husova 5, Prague, Czech Republic
⁶ Doctoral School in Engineering and Applications of Laser and Accelerators, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, Romania

^* e-mail: asli.kusoglu@eli-np.ro, kusoglu@istanbul.edu.tr

Published online: 28 October 2024

Abstract

A γ-ray spectroscopic study of ¹⁰B is reported. Excited states in ¹⁰B were populated in inelastic proton scattering and their γ-decays were measured with the ELIFANT array, a state-of-the-art spectrometer with large volume LaBr₃:Ce and CeBr₃ detectors placed in anti-Compton shields and having unprecedented efficiency for high-energy γ rays. A few weak transitions were observed in the experiment, namely M3 transition between J^π, T = 0⁺₁, 1 isobaric analog state to the J^π, T = 3⁺₁,0 ground state and E2 transition between the J^π, T = 2⁺₁,0 state and the isobaric analog state. The results are compared to a new set of ab initio no-core shell model calculation using the newest version of the local position-space chiral N³LO nucleon-nucleon interaction, which correctly reproduces the spectrum of the excited states in ¹⁰B, a problem of the theory in previous years.