Abstract
A study of the \(^{11}\)B(\(^{3}\)He,d)\(^{12}\)C reaction at incident \(^{3}\)He energy \(\hbox {E}_{{lab}}\) = 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 \(^{12}\)C. 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 \(\alpha \)-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 \(^{12}\)C were presented.
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Data Availability Statement
This manuscript has no associated data or the data will not be deposited. [Author’s comment:Experimental data present in the article is new, not yet published. Only our experimental data for the g.s. and 16.57 MeV states are published in article https://doi.org/10.1103/PhysRevC.102.054612. We plan to deposit our experimental data after article publication.]
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Acknowledgements
The work was partly supported by the Russian Science Foundation (project no. 18-12-00312) and a mobility grant from the Academy of Finland. We are very grateful to the staff of the Accelerator Laboratory for excellent working atmosphere and maintaining high-quality beams throughout the measurements.
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Communicated by Alessia Di Pietro.
This article is dedicated to memory of our leader and colleague, Professor Alexey Ogloblin. He passed on February 23, 2021. Alexey Ogloblin will be greatly missed as a Head of department of Nuclear Physics in Kurchatov Institute. His work in light exotic nuclei was widely cited and earned him great respect. He had the highest standards in research, publication, mentoring, and international collaboration. We will miss the contributions he could made else to the nuclear physics and to our lives as a leader, colleague and friend.
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Demyanova, A., Starastsin, V., Ogloblin, A. et al. The spin-parities of the 13.35 MeV state and high-lying excited states around 20 MeV in \(^{12}\)C nucleus. Eur. Phys. J. A 57, 204 (2021). https://doi.org/10.1140/epja/s10050-021-00515-7
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DOI: https://doi.org/10.1140/epja/s10050-021-00515-7