Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8187286 | Physics Letters B | 2017 | 5 Pages |
Abstract
The momentum distribution of 11Be fragments produced by the breakup of 12Be interacting with a proton target at 700.5 MeV/u energy has been measured at GSI Darmstadt. To obtain the structure information on the anomaly of the N=8 neutron shell, the momentum distribution of 11Be fragments from the one-neutron knockout Be12(p,pn) reaction, measured in inverse kinematics, has been analysed in the distorted wave impulse approximation (DWIA) based on a quasi-free scattering scenario. The DWIA analysis shows a surprisingly strong contribution of the neutron 0d5/2 orbital in 12Be to the transverse momentum distribution of the 11Be fragments. The single-neutron 0d5/2 spectroscopic factor deduced from the present knock-out data is 1.39(10), which is significantly larger than that deduced recently from data of 12Be breakup on a carbon target. This result provides a strong experimental evidence for the dominance of the neutron ν(0d5/2)2 configuration in the ground state of 12Be.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Le Xuan Chung, Carlos A. Bertulani, Peter Egelhof, Stoyanka Ilieva, Dao T. Khoa, Oleg A. Kiselev,