The spin-parities of the 13.35 MeV state and high-lying excited states around 20 MeV in 12 C nucleus


Demyanova A. Starastsin V. Ogloblin A. Danilov A. Dmitriev S. Trzaska W. Heikkinen P. Belyaeva T. Goncharov S. Maslov V. Sobolev Y. Gurov Y. Chernyshev B. Burtebaev N. Janseitov D. Khlebnikov S.
June 2021Springer Science and Business Media Deutschland GmbH

European Physical Journal A
2021#57Issue 6

A study of the 11B(3He,d)12C reaction at incident 3He energy E lab = 25 MeV has been performed at the K-130 cyclotron at the University of Jyväskylä, Finland. Differential cross sections have been measured for the 13.35 MeV state and for the states with excitation energy around 20 MeV in 12C. The data were analyzed with the DWBA method. A tentative assignment, 4-, is given for the state at 13.35 MeV in a joint study of the reaction and inelastic scattering of α-particles with the energy of 110 MeV. For the state at 20.98 MeV, the possible spin-parity 3- and the isospin T = 0 are assigned for the first time. Our model description of the broad state at 21.6 MeV is consistent with the previous assignments of isospin T = 0 and spin-parity of 2+ or 3-. The excited state at 22.4 MeV may have possible spin-parities of either 6+ or 5-. The collected statistics was insufficient to solve this question. Rotational bands which can exist in 12C were presented.



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National Research Centre Kurchatov Institute, Akademika Kurchatova pl. 1, Moscow, 123182, Russian Federation
Department of Physics, University of Jyväskylä, Jyväskylä, Finland
Universidad Autonoma del Estado de Mexico, Toluca, Mexico
M.V. Lomonosov Moscow State University, Moscow, Russian Federation
Flerov Laboratory of Nuclear Reactions, JINR, Dubna, Russian Federation
National Research Nuclear University MEPhI, Moscow, Russian Federation
Institute of Nuclear Physics, Almaty, Kazakhstan
Al-Farabi Kazakh National University, Almaty, Kazakhstan
V. G. Khlopin Radium Institute, St. Petersburg, Russian Federation

National Research Centre Kurchatov Institute
Department of Physics
Universidad Autonoma del Estado de Mexico
M.V. Lomonosov Moscow State University
Flerov Laboratory of Nuclear Reactions
National Research Nuclear University MEPhI
Institute of Nuclear Physics
Al-Farabi Kazakh National University
V. G. Khlopin Radium Institute

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