β-delayed neutron decay of 21N

摘要

The β-delayed neutron and γ spectra of neutron-rich nucleus 21N using β-γ and β-n coincidence measurements were presented in this paper.Thirteen new neutron groups ranging from 0.28 MeV to 4.98 MeV and with a total branching ratio 88.7±4.2% were observed.One γ transition among the excited states of 21O,and four γ transitions among the excited states of 20O were identified in the β decay chain of 21N.The ungated half-life of 83.8±2.1 ms was also determined for 21N.