OPEN QUESTIONS IN STUDY OF 13C EXOTIC EXCITED STATES


Danilov A.N. Demyanova A.S. Dmitriev S.V. Ogloblin A.A. Starastsin V.I. Goncharov S.A. Janseitov D.M.
2021Jagiellonian University

Acta Physica Polonica B, Proceedings Supplement
2021#14Issue 4781 - 786 pp.

13C is a good example of a “normal” nucleus that is well described within the shell model. Its level scheme is reliably determined up to excitation energies ∼ 10 MeV. However, some questions remain open regarding the structure of low-lying 13C states. This leads to the increased attention to 13C. In 2014, our group announced the discovery of a state of 13C with an abnormally small radius. In the framework of the modified diffraction model (MDM) method, analyzing data on α-scattering on 13C at 65 and 90 MeV, it was shown that this state has a radius reduced by 10%. At the same time, theoretical works predict dilute structure and increased radius for this state, and assumptions were made about its rotational structure. Another important question is the search for possible analogues of the Hoyle state in 13C. Confirmed analog of the Hoyle state is the 1/2− (8.86 MeV) state in 13C. Another possible candidate is the next 1/2− state - 11.08 MeV. Moreover, a hypothesis was put forward about a new type of symmetry in the 13C structure - D30h symmetry. On the basis of D30h symmetry, the rotational nature of a whole group of low-lying 13C states was predicted. In the work, 6 rotational bands were proposed, that is, almost all low-lying 13C states were distributed among the rotational bands. Thus, a critical analysis of the available data is required to answer the question about the nature of low-lying excited states in 13C.



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National Research Centre, Kurchatov Institute, Moscow, 123182, Russian Federation
Lomonosov Moscow State University, Moscow, 119991, Russian Federation
JINR, Moscow Region, Dubna, 141700, Russian Federation
Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan

National Research Centre
Lomonosov Moscow State University
JINR
Institute of Nuclear Physics
Al-Farabi Kazakh National University

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