Virtual-state character of the 9Be 1/2+ state in the 9Be(γ,n)8Be reaction

被引：32

作者：

Odsuren, Myagmarjav ^{[1
]}

Kikuchi, Yuma ^{[2
]}

Myo, Takayuki ^{[3
,4
]}

Aikawa, Masayuki ^{[5
]}

Kato, Kiyoshi ^{[5
]}

机构：

[1] Natl Univ Mongolia, Nucl Res Ctr, Ulaanbaatar 210646, Mongolia

[2] RIKEN, Nishina Ctr, Wako, Saitama 3510198, Japan

[3] Osaka Inst Technol, Fac Engn, Gen Educ, Osaka 5358585, Japan

[4] Osaka Univ, RCNP, Ibaraki 5670047, Japan

[5] Hokkaido Univ, Fac Sci, Nucl React Data Ctr, Sapporo, Hokkaido 0600810, Japan

来源：

PHYSICAL REVIEW C | 2015年 / 92卷 / 01期

关键词：

R-PROCESS NUCLEOSYNTHESIS; UNBOUND STATES; CROSS-SECTIONS; LIGHT-NUCLEI; RESONANCES; BERYLLIUM;

D O I：

10.1103/PhysRevC.92.014322

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We study the character of the first excited 1/2(+) state of Be-9, which is observed as a low-lying sharp peak in the cross section of Be-9(gamma,n)2(4)He just above the Be-8 + n threshold. Using the alpha + alpha + n three-body model, we describe the ground and excited unbound states of Be-9 above the alpha + alpha + n threshold. Applying the complex scaling method to the three-body model, we find no 1/2(+) resonant solutions with the scaling angle of theta <= 15 degrees, while the low-lying peak in the photodisintegration cross section is reproduced in the present calculation. It is found that the Be-8 + n continuum states dominate the low-lying peak in the cross section. Furthermore, using the analytical continuation of the coupling constant of the three-body interaction for the alpha + alpha + n system, we discuss the virtual-state character of the 1/2(+) state.

引用

页数：6

共 38 条

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