D. Y. Pang

Study of the halo nucleus 6He through the direct nuclear reactions

Differential cross sections for quasi-elastic scattering, breakup reaction as well as 1n- and 2n-transfer reactions induced by 6He at 25 MeV/nucleon from a 9Be target are reported. The experimental data were analysed in the context of the coupled-channel calculations. The internal structure of 6He is discussed and further studies are proposed.

Efficiency calibration of a large-area neutron detector by using Am/Be neutron source

Neutron detection efficiency for a long wedge-shaped plastic scintillation detector was measured by using the Am/Be neutron source. The overall efficiency attains 23% at around 2 MeV and decreases to 15% at about 5 MeV. The experimental results are in agreement with the Monte Carlo simulation calculations.

Observation of a new transition in the {beta}-delayed neutron decay of {sup 18}N

A new transition is reported in the beta-delayed neutron decay of {sup 18}N. The observed neutron energy is 3.78{+-}0.05 MeV with a branching ratio of 0.05{+-}0.03%, which corresponds to an excitation energy of 12.05{+-}0.05 MeV in the daughter nucleus {sup 18}O. The log ft value of this transition is 5.24{+-}0.3, which, together with the previously reported electron scattering data, determines the J{sup {pi}} value of this level to be 1{sup -}. The experimental data are compared to the shell model calculations in different model spaces.

Elastic 3He‐transfer Reaction of 6He on the 9Be Target at 25 MeV/nucleon

Angular distribution of the cross sections of the elastic 3He‐transfer of the 6He nucleus on the 9Be target were measured at the incident energy of 25 MeV/nucleon. The experimental data at the backward angles were analyzed within the finite‐range DWBA framework. A large spectroscopic amplitude of 1.41 for the 3He‐cluster in the ground state of the 9Be nucleus was needed for this experiment, which is much larger than its theoretical prediction of 0.286.