Decay modes of the Hoyle state in C-12
Decay modes of the Hoyle state in C-12
复制标题
C-12 霍伊尔态的衰变模式
DOI：
10.1016/j.physletb.2018.02.040
复制
发表时间：
2018
影响因子：
4.4
通讯作者：
Zhang S.
中科院分区：
文献类型：
--
作者：
Zheng H.;Bonasera A.;Huang M.;Zhang S.
最近的实验结果给出了Hoyle态直接衰变到3α相对于顺序衰变到Be 8+ α的上限小于0.043%（95%CL）。我们进行了一维和二维隧道计算来估计这样的比率，发现它比实验小一个数量级以上，这取决于核力的范围。这是在高统计实验能力范围内。我们的结果也可以通过测量12 C的高激发能态的衰变模式来检验，其中在E_（12 C）= 10.3 MeV时，直接衰变与顺序衰变的比率可能达到10%。玻色爱因斯坦凝聚（BEC）和霍伊尔态的直接衰变之间的联系也得到了解决。我们讨论了一个假设的Efimov态，其能量为E_（12 C）= 7.458 MeV，它主要以3α的等能量顺序衰变：这是一个违反直觉的隧穿结果。这样的状态，如果存在的话，至少比霍伊尔的状态少8个数量级，因此低于最近和过去实验的灵敏度。
Recent experimental results give an upper limit less than 0.043%(95% CL) to the direct decay of the Hoyle state into 3α respect to the sequential decay into Be 8+ α. We performed one and two-dimensional tunneling calculations to estimate such a ratio and found it to be more than one order of magnitude smaller than experiment depending on the range of the nuclear force. This is within high statistics experimental capabilities. Our results can also be tested by measuring the decay modes of high excitation energy states of 12 C where the ratio of direct to sequential decay might reach 10% at E⁎(12 C)= 10.3 MeV. The link between a Bose Einstein Condensate (BEC) and the direct decay of the Hoyle state is also addressed. We discuss a hypothetical ‘Efimov state’at E⁎(12 C)= 7.458 MeV, which would mainly sequentially decay with 3α of equal energies: a counterintuitive result of tunneling. Such a state, if it would exist, is at least 8 orders of magnitude less probable than the Hoyle's, thus below the sensitivity of recent and past experiments.