||Photodisintegration cross section of 9Be up to 16 MeV in the α + α + n three-body model
Kikuchi, Yuma ,
Odsuren, Myagmarjav ,
Myo, TakayukiKatō, Kiyoshi
, p.054605 , 2016-05-06 , American Physical Society (APS)
The photodisintegration of 9Be in the energy region lower than Eγ
= 16 MeV is investigated by using the
α + α + n three-body model and the complex scaling method. The cross section exhibits two aspects in two
different energy regions. In the low-energy region up to Eγ
= 6 MeV, the cross section is explained by the
transition strengths into the excited resonant states of 9Be, while the dipole transition into the nonresonant
continuum states of 8Be(2+) + n dominates the cross section in the energy region of 6 Eγ 16 MeV.
Furthermore, it is shown that the dipole strength at Eγ
∼ 8MeV is understood to be caused by the single-neutron
excitation from the 8Be(2+) ⊗ νp3/2 configuration in the ground state.