Ab initio study of the J(pi)=0(+/-) continuum structures in He-4

作者：Aoyama S^*; Baye D

来源：PHYSICAL REVIEW C, 2018, 97(5): 054305.

DOI：10.1103/PhysRevC.97.054305

The J(pi) = 0(+/-) continuum structures in He-4 are investigated by using an ab initio reaction theory with the microscopic R-matrix method. In the E-x >=similar to 20 MeV excitation energy region of He-4, the continuum states are mainly described by the t + p, h + n, and d + d channels. The J(pi) = 0(+/-) elastic phase shifts of the t + p and h + n channels show an apparently resonant behavior which might indicate the existence of excited 0(3)(+) and 0(2)(-) resonance states of He-4 above the known 0(2)(+) and 0(1)(-) ones. However, the corresponding 0(3)(+) and 0(2)(-) resonances have not been observed yet, although an experimental candidate with a large decay width is reported for 0(2)(-). In this paper, by analyzing the J(pi) = 0(+/-) S matrices, we discuss why the observation of these states is unlikely.

• 出版日期2018-5-3