【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¹⁶O+¹²C非弹散射实验,给出了¹⁶O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¹⁶O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¹²C（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。更多还原

【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 of¹⁶0 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.更多还原