A method for determination of the s orbital component of ^(12)Be ground state  

作　　者：蔡晓鹭 樊广伟 许杭华 安振东 范功涛 徐本基 李永江 潘强岩 阎喆 徐望 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences [3]School of Chemical Engineering,Anhui University of Science and Technology [4]Shanghai Synchrotron Radiation Facility,Chinese Academy of Sciences

出　　处：《Nuclear Science and Techniques》2014年第2期71-78,共8页核技术（英文）

基　　金：Supported by the National Natural Science Foundation of China(No.11179018 and 11305238);the Instrument Developing Project of the Chinese Academy of Sciences(No.YZ201246)

摘　　要：The ambiguity of the structure of ^(12)Be especially in the configuration of Be ground state has attracted a lot of attention recently.We notice that the nuclear reaction cross section or at low energy region is sensitive to the surface structure of ^(12)Be,which is greatly impacted by the ground state configuration of ^(12)Be especially by the occupancy probability of the s orbital component.By using existed interaction cross section data of ^(12)Be on C at 790 MeV/nucleon and Glauber model,the upper limit of the s orbital occupation probability of ^(12)Be 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 ^(12)Be with proper nuclear-matter density distribution calculations for different orbitals of ^(12)Be ground state.Hence we bring forward to determine the s orbital component of ^(12)Be by measuring the ctr of ^(12)Be on C and Al at several tens of MeV/nucleon.In this paper,the feasibility and detailed experimental scheme of the ctr measurement are carefully studied.The precision of the s orbital occupation probability of ^(12)Be ground state is expected to achieve 9%by using the proposed 2%ctr data.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 err at low energy region is sensitive to the surface structure of lBe, 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 rR of 12Be on C and A1 at several tens of MeV/nucleon. In this paper, the feasibility and detailed experimental scheme of the err 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% cR data.

关 键 词：基态结构 轨道 测定方法 组件 单粒子模型 种用 作用截面 分布计算 

分 类 号：O571[理学—粒子物理与原子核物理]