A method for determination of the s orbital component of ¹²Be ground state 后印本

摘要: The ambiguity of the structure of ¹²Be especially in the configuration of ¹²Be ground state has attracted a lot of attention recently. We notice that the nuclear reaction cross section σ_R at low energy region is sensitive to the surface structure of ¹²Be, which is greatly impacted by the ground state configuration of ¹²Be especially by the occupancy probability of the s orbital component. By using existed interaction cross section data of ¹²Be on C at 790 MeV/nucleon and Glauber model, the upper limit of the s orbital occupation probability of ¹²Be ground state is roughly determined to be about 56% with Single Particle Model calculations. This demonstrates that the method is very promising to determine the s orbital component of ¹²Be with proper nuclear-matter density distribution calculations for different orbitals of ¹²Be ground state. Hence we bring forward to determine the s orbital component of ¹²Be by measuring the σ_R of ¹²Be on C and Al at several tens of MeV/nucleon. In this paper, the feasibility and detailed experimental scheme of the σ_R measurement are carefully studied. The precision of the s orbital occupation probability of ¹²Be ground state is expected to achieve 9% by using the proposed 2% σ_R data.