通过4-α衰变观测^(16)O中可能的玻色凝聚态  

Searching for Possible Bose-Einstein Condensate States in ^(16)O via Its 4-α Decay

作　　者：陈家豪 叶沿林[1] 马凯 韩家兴 王东玺 林承键[2,3] 贾会明 杨磊[2] 李根[1] 阳黎升 胡梓瑶 谭智威 魏康 蒲伟良 陈莹 楼建玲 杨晓菲[1] 李奇特 杨再宏[1] 骆天鹏[2] 黄大湖 钟善豪 李智焕 许金艳[1] CHEN Jiahao;YE Yanlin;MA Kai;HAN Jiaxing;WANG Dongxi;LIN Chengjian;JIA Huiming;YANG Lei;LI Gen;YANG Lisheng;HU Ziyao;TAN Zhiwei;WEI Kang;PU Weiliang;CHEN Ying;LOU Jianling;YANG Xiaofei;LI Qite;YANG Zaihong;LUO Tianpeng;HUANG Dahu;ZHONG Shanhao;LI Zhihuan;XU Jinyan(School of Physics and State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China;Department of Nuclear Physics,China Institute of Atomic Energy,Beijing 102413,China;College of Physics and Technology,Guangxi Normal University,Guilin 541004,Guangxi,China)

机构地区：[1]北京大学物理学院和核物理与核技术国家重点实验室,北京100871 [2]中国原子能科学研究院核物理研究所,北京102413 [3]广西师范大学物理科学与技术学院,广西桂林541004

出　　处：《原子核物理评论》2024年第1期292-298,共7页Nuclear Physics Review

基　　金：国家重点研发计划项目(2023YFA1606403,2023YFE0101600,2022YFA1602302);国家自然科学基金资助项目(12235020,12027809,11961141003,U1967201,U2167204);国家财政部稳定支持研究经费(WDJC-2019-13);领创科研项目(LC192209000701,LC202309000201)。

摘　　要：近期在中国原子能科学研究院北京串列加速器核物理国家实验室开展的^(16)O+^(12)C非弹散射实验,给出了^(16)O中存在4-α玻色凝聚状态的新证据。实验采用多套双面硅微条带电粒子望远镜,首次在^(16)O衰变中实现了4个α粒子的准确识别(Particle Identification,PID)和符合测量。在此基础上获得了高分辨的反应O值谱并重建了清晰的4-α共振态。其中在阈值附近观察到4个高显著度(大部分高于5σ)的共振态,它们按照^(12)C(Hoyle state)+α的特征模式衰变,与理论预言的类Hoyle-BEC结构及其转动带特征相一致。本观测结果将推动进一步的理论研究,实验上也需要对上述共振态做更多物理量的观测。Recently,an inelastic scattering experiment of ^(16)O+^(12)C 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 ^(16)O has been obtained.Employing a series of double-sided-silicon-strip-based telescopes,this experiment achieved accurate particle identification and coincidence measurement of 4-αin the decay of ^(16)O for the first time.Based on this,high-resolution reaction Q-value spectra was obtained and clear 4-αresonance states were reconstructed.In the vicinity of the 4-αseparation threshold,4 highly significant(3 of them above 5σ)resonance states were observed,which decay to the characteristic pattern of ^(12)C(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.

关 键 词：集团结构 类Hoyle态 ^(16)O的共振态 高激发 

分 类 号：O571.21[理学—粒子物理与原子核物理]