Invariant mass spectroscopy of <sup>15</sup>C*

Abstract Invariant-mass spectroscopy has been performed to search for possible resonance states in the loosely bound neutron-rich 15 C nucleus. By detecting alpha and 11 Be in coincidence, we reconstruct the excitation energy spectrum for 15 C. To estimate the physical background from non-resonant prompt alpha particles, we employ a recently proposed weighted event-mixing method with phenomenological reduced weighting at around the alpha-decay threshold to account for the depletion in the prompt alpha's contribution owing likely to the Coulomb final-state interactions. A new weighted mixed-event method that focuses on a robust treatment of the Coulomb effect is also proposed. Through fitting the spectrum using the background estimated with these two methods, up to two resonance state candidates are proposed. Further experiments with improved statistics and theoretical calculations are called for to confirm these resonance states.

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Publication Details

Journal
Chinese Physics C
Published
2025-04-26
DOI
https://doi.org/10.1088/1674-1137/add10c
Primary Topic
Nuclear physics research studies
Type
article
Field-Weighted Citation Impact
0.00

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article

Invariant mass spectroscopy of 15C*

Zhi-Yu 孙志宇 Sun, Yanlin Ye, Dexin Wang, K. Wang et al.
Chinese Physics C
Nuclear physics research studies
article

Invariant mass spectroscopy of 15C*

Zhi-Yu 孙志宇 Sun, Yanlin Ye, Dexin Wang, K. Wang, Yan-Yun 杨彦云 Yang, H. J. Ong, Xiao-Dong Xu, Shu-Ya Jin, Jiaxing Han, Jingjing Li, Yan Liu, Longchun Tao, B. F. Lv, Peng Ma, Satoru Terashima, Ma Junbing, Jian-Ling 楼建玲 Lou, Jian-Song 王建松 Wang
article en

Abstract

Abstract Invariant-mass spectroscopy has been performed to search for possible resonance states in the loosely bound neutron-rich 15 C nucleus. By detecting alpha and 11 Be in coincidence, we reconstruct the excitation energy spectrum for 15 C. To estimate the physical background from non-resonant prompt alpha particles, we employ a recently proposed weighted event-mixing method with phenomenological reduced weighting at around the alpha-decay threshold to account for the depletion in the prompt alpha's contribution owing likely to the Coulomb final-state interactions. A new weighted mixed-event method that focuses on a robust treatment of the Coulomb effect is also proposed. Through fitting the spectrum using the background estimated with these two methods, up to two resonance state candidates are proposed. Further experiments with improved statistics and theoretical calculations are called for to confirm these resonance states.

Chinese Physics CVol. 49(8)
Inner Mongolia University for Nationalities (CN), Harbin Engineering University (CN), Chinese Academy of Sciences (CN), Peking University (CN), Huzhou Normal University (CN), Institute of Modern Physics (CN), RIKEN Nishina Center (JP), University of Chinese Academy of Sciences (CN), State Key Laboratory of Nuclear Physics and Technology, The University of Osaka (JP)
National Natural Science Foundation of China, Natural Science Foundation of Gansu Province, National Key Research and Development Program of China
Openalex Percentile: Top 96%
Nuclear physics research studies
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