Neutron-driven collectivity in light tin isotopes: Proton inelastic scattering from Sn-104

作者：Corsi A^*; Boissinot S; Obertelli A; Doornenbal P; Dupuis M; Lechaftois F; Matsushita M; Peru S; Takeuchi S; Wang H; Aoi N; Baba H; Bednarczyk P; Ciemala M; Gillibert A; Isobe T; Jungclaus A; Lapoux V; Lee J; Martini M; Matsui K; Motobayashi T; Nishimura D; Ota S; Pollacco E; Sakurai H; Santamaria C; Shiga Y; Sohler D; Steppenbeck D; Taniuchi R

来源：Physics Letters B, 2015, 743: 451-455.

DOI：10.1016/j.physletb.2015.03.018

• Collectivity
• Inelastic scattering
• Gamma spectroscopy

Inelastic scattering cross sections to individual bound excited states of Sn-104 were measured at 150 MeV/u beam energy and analyzed to evaluate the contribution of neutron and proton collectivity. State-of-the-art Quasi-Particle Random Phase Approximation (QRPA) with the D1M Gogny interaction reproduces the experimental proton collectivity and our inelastic scattering cross sections once used as input for a reaction calculation together with the Jeukenne-Lejeune-Mahaux (JLM) potentials. Experimental inelastic scattering cross section decreases by 40(24)% from Sn-112 to Sn-104. The present work shows that (i) proton and neutron collectivities are proportional over a large range of tin isotopes (including Sn-104), as is typical for isoscalar excitations, and (ii) the neutron collectivity dominates. It suggests that the plateau in the mass range A = 106-112 displayed by E2 transition probabilities is driven by neutron collectivity.

• 出版日期2015-4-9
• 单位中国地震局; RIKEN; 北京大学