12Be中子转移截面的测量

In recent years, di-neutron halo nucleus 6He, 11Li，14Be and so on are found in the radioactive beam experiment. And there are Borromean nuclei too. The correlations between two valence neutrons is strong. In experimental measurement the cross section of two neutron transfer is bigger than cross section of single neutron transfer. Three body structure of 12Be was found in experiments too. But it is not borromean nucleus. 11Be is single neutron halo nucleus. So it's unclear whether 12Be has strong di-neutron correlation or not. It’s important to research di-neutron structure. Measurement on neutron transfer reaction of 12Be particle (both charged and neutral) γcoincidences, the single neutron and di-neutron transfer cross section can be obtained. It’s the direction result on structure of 12Be.

通过近些年来的放射性束实验测量，发现6He、11Li、14Be等双中子晕核。而且实验发现，这些双中子晕核都属于Borromean核。其核内的2个价中子之间有着很强的关联效应。表现在实验中，是其双中子转移截面比单中子转移截面大很多。实验也发现12Be也具有三体核结构。但是12Be不是Borromean核。11Be为单中子晕核。因此，12Be的内部是否仍然存在强的2n关联有着重要意义。对于2n集团的形成机制的研究找到新的途径。.现在通过三重符合的方法测量12Be的中子转移截面，可以得到准确的单中子和双中子转移截面。得到关于12Be内部结构的直接实验依据。