Difficulties in probing density dependent symmetry potential with the HBT interferometry

作者：Li QingFeng; Shen CaiWan

来源：Science in China - Series G: Physics Mechanics and Astronomy , 2009, 52(10): 1530-1535.

DOI：10.1007/s11433-009-0210-2

• density dependence of the symmetry energy
• sensitive observables
• HBT correlation

Based on the updated UrQMD transport model, the effect of the symmetry potential energy on the two-nucleon HBT correlation is investigated with the help of the coalescence program for constructing clusters, and the CRAB analyzing program of the two-particle HBT correlation. An obvious nonlinear dependence of the neutron-proton (or neutron-neutron) HBT correlation C (np,nn) ) at small relative momenta on the stiffness factor gamma of the symmetry potential energy is found: when gamma a parts per thousand(2) 0.8, C (np,nn) increases rapidly with increasing gamma, while it starts to saturate if gamma a parts per thousand(3)0.8. It is also found that both the symmetry potential energy at low densities and the conditions of constructing clusters at the late stage of the whole process influence the two-nucleon HBT correlation with the same power.

• 出版日期2009-10
• 单位湖州师范学院