Observation of three-neutron sequential emission from O*25
Observation of three-neutron sequential emission from O*25
复制标题
O*25三中子顺序发射的观测
DOI：
10.1103/physrevc.100.034323
复制
发表时间：
2019
影响因子：
3.1
通讯作者：
Thoennessen, M.
中科院分区：
文献类型：
--
作者：
Sword, C.;Brett, J.;Baumann, T.;Brown, B. A.;Frank, N.;Herman, J.;Jones, M. D.;Karrick, H.;Kuchera, A. N.;Thoennessen, M.
背景：中子非束缚态的测量可以检验丰中子核的核模型，在某些情况下，这些丰中子核不能用其他方法探测.目的：寻找三中子分离能以上的高激发中子非束缚态.方法：用不变质量谱方法重建了衰变能. 101.3 MeV/u束流与液氘靶碰撞。两个质子的去除反应激发了衰变成三个中子和一个碎片。中子由塑料闪烁棒阵列探测，而直接放置在靶后的4-Tm偶极磁体将带电碎片重定向到一系列带电粒子探测器。结果：在激发能约为9 MeV时，观测到了中子未束缚能级，该能级通过发射3个中子依次衰变到.结论：在激发能约为9 MeV时，观测到的共振强度与壳模型和程函计算结果一致.
Background:Measurements of neutron-unbound states can test nuclear models in very neutron-rich nuclei that, in some cases, cannot be probed with other methods.Purpose:Search for highly excited neutron-unbound states ofabove the three-neutron separation energy.Method:The decay energy ofwas reconstructed using the invariant mass spectroscopy method. A 101.3-MeV/ubeam collided with a liquid-deuterium target. Two-proton removal reactions populated excitedthat decayed into three neutrons and anfragment. The neutrons were detected by arrays of plastic scintillator bars, whereas a 4-Tm dipole magnet placed directly after the target redirected charged fragments to a series of charged-particle detectors. The data were compared with detailed Monte Carlo simulations of the reaction process and subsequent decay.Results:The data show evidence of neutron-unbound level(s) inat an excitation energy of about 9 MeV which decay sequentially by the emission of three neutrons to.Conclusion:The observation of resonance strength inat about 9 MeV is consistent with shell-model and eikonal calculations for the two-proton removal reaction from.