CNPC2023 Searching for the possible Bose–Einstein condensate states in $^{16}$O via its 4-$\alpha$ decay

Subjects: Physics >> Nuclear Physics submitted time 2024-02-06

Jiahao Chen Yanlin Ye Kai Ma Jiaxing Han Dongxi Wang Chengjian Lin Huiming Jia Lei Yang Gen Li Lisheng Yang Ziyao Hu Zhiwei Tan Kang Wei Weiliang Pu Ying Chen Jianling Lou Xiaofei Yang Qite Li Zaihong Yang Tianpeng Luo

Abstract： Recently, an inelastic scattering experiment of 16O + 12C was performed at the Beijing Tandem Accelerator Nuclear Physics National of China Institute of Atomic Energy. New evidence for the existence of Bose-Einstein condensation state of 16𝑂 has been obtained. Employing a series of double-sided-silicon-strip-based telescopes, this experiment achieved accurate particle identification and coincidence measurement of 4-𝛼 in the decay of 16O for the first time. Based on this, high-resolution reaction 𝑄-value spectra was obtained and clear 4-𝛼 resonance states were reconstructed. In the vicinity of the 4-𝛼 separation threshold, 4 highly significant (3 of them above 5𝜎) resonance states were observed, which decay to the characteristic pattern of 12C(Hoyle state) + 𝛼, consistent with the predicted Hoyle-BEC structure and its rotating band features. The observation results will promote further theoretical research, and more measurements are needed for these resonance states in experiments.

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