深垒下能区的^(12)C+^(13)C熔合截面测量对检验天体中熔合反应外推模型具有很重要的意义。目前在库仑位垒以下能区存在的各种测量结果,都利用了统计模型来修正得到熔合截面,但对于这些方法间的系统误差仍没有很好地研究。实验采用离线活度测量的方法,在Ec.m.=4.4～5.8 Me V能区内对^(12)C+^(13)C熔合截面进行测量。经Hauser-Feshbach统计模型对分支比的修正后,熔合总截面由24Na活度推导出。通过本实验数据与其它实验方法获得的数据进行比较,确定了统计模型的系统误差为14%。
Our previous experimental result for proton-rich nucleus ^(8)B at above the Coulomb barrier shows that in spite of its low proton separation energy(0.136 MeV)there is no strong breakup coupling effects[1].The fact is in contrast to the observation of neutron-rich nuclei ^(11)Be around the Coulomb barrier.A systematic study for elastic scattering cross sections of neutron-rich nucleus ^(11)Be and the proton-halo nucleus ^(8)B at low and higher energies shows that the Coulomb rainbow in the elastic scattering of ^(11)Be is still strongly suppressed at high energies[2].In order to examine the predictions,experimental measurements for 11Be elastic scattering and breakup for ^(11)Be+^(208)Pb system at 141 and 209 MeV were performed at the National Laboratory of Heavy Ion Research of the Institute of Modern Physics,Lanzhou,China.
