摘要
The dynamic coupling effects on fusion cross sections for reactions^(32)S + ^(94,96)Zr and ^(40)Ca + ^(94,96)Zr are studied with the universal fusion function formalism and an empirical coupled channel(ECC) model. An examination of the reduced fusion functions shows that the total effect of couplings to inelastic excitations and neutron transfer channels on fusion in ^(32)S +^(94)Zr(^(40)Ca +^(94)Zr) is almost the same as that in ^(32)S +^(96)Zr(^(40)Ca +^(96)Zr). The enhancements of the fusion cross section at sub-barrier energies due to inelastic channel coupling and neutron transfer channel coupling are evaluated separately by using the ECC model. The results show that effect of couplings to inelastic excitations channels in the reactions with94 Zr as target should be similar as that in the reactions with ^(96) Zr as target. This implies that the quadrupole deformation parameters β_2of ^(94)Zr and^(96) Zr should be similar to each other.However, β_2 's predicted from the finite-range droplet model, which are used in the ECC model, are quite different. Experiments on^(48) Ca +^(94)Zr or^(36) S +^(94)Zr are suggested to solve the puzzling issue concerning β_2for^(94)Zr.
The dynamic coupling effects on fusion cross sections for reactions^（32）S ＋ ^（94,96）Zr and ^（40）Ca ＋ ^（94,96）Zr are studied with the universal fusion function formalism and an empirical coupled channel（ECC） model. An examination of the reduced fusion functions shows that the total effect of couplings to inelastic excitations and neutron transfer channels on fusion in ^（32）S ＋^（94）Zr（^（40）Ca ＋^（94）Zr） is almost the same as that in ^（32）S ＋^（96）Zr（^（40）Ca ＋^（96）Zr）. The enhancements of the fusion cross section at sub-barrier energies due to inelastic channel coupling and neutron transfer channel coupling are evaluated separately by using the ECC model. The results show that effect of couplings to inelastic excitations channels in the reactions with94 Zr as target should be similar as that in the reactions with ^（96） Zr as target. This implies that the quadrupole deformation parameters β_2of ^（94）Zr and^（96） Zr should be similar to each other.However, β_2 ＇s predicted from the finite-range droplet model, which are used in the ECC model, are quite different. Experiments on^（48） Ca ＋^（94）Zr or^（36） S ＋^（94）Zr are suggested to solve the puzzling issue concerning β_2for^（94）Zr.
基金
supported by the National Key Basic Research Program of China(Grant No.2013CB834400)
the National Natural Science Foundation of China(Grant Nos.11175252
11120101005
11275248
11475115
and 11525524)
the Knowledge Innovation Project of the Chinese Academy of Sciences(Grant No.KJCX2-EW-N01)
关键词
聚变反应
ZR
锆
钙
形变
四极
模型评价
通道耦合
empirical coupled channel model barrier distribution universal fusion function neutron transfer
