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郑永男 周冬梅 袁大庆 M. Mihara K. Matsuta M. Fukuda T. Minamisono T. Suzuki 张锡珍 左翼 徐勇军 朱佳政 王志强 骆海龙 范平 朱升云 《中国物理 C》2008,32(Z2):174-176
The spin polarized β-emitting mirror nuclei 12B(Iπ=1+,T1/2=20.18 ms) and 12N(Iπ=1+,T1/2=11 ms) are produced by the low nuclear reactions 11B(d, p) 12B and 10B(3He,n) 12N and by selecting the projectile energy and the recoil angle. Their magnetic moments are measured by the β-NMR technique. The magnetic moments obtained after Knight shift correction are μ(12B)=1.001(17) μN and μ(12N)=0.4571(1) μN. The calculation using the existing shell model could not reproduce the measured magnetic moments for 12B and 12N simultaneously. 相似文献
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The extoic structure of 29P was investigated by measuring its magnetic moment in the ground state with β-NMR method. We got the experimental value of 1.2346 μN after diamagnetism correction. It is very close to the calculated value of 1.1009 μN computed with shell model. The shell model calculation also gave a proton density distribution of 29P with a long tail. The present results show that 2s1/2 proton in the 29P may lead to the proton-skin structure. 相似文献
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利用中国原子能科学研究院核工业放射性计量测试中心的5SDH-2串列加速器进行了ST-401薄塑料闪烁体的能量响应实验.选用T(p,n)3He反应和D(d,n)3He反应作为中子源,子源,中子束流采用复合屏蔽体进行准直,源强采用正比计数管和半导体望远镜进行监测,实验测量了厚度从0.16mm到2.00mm的八种规格薄闪烁体的能量响应曲线,对实验的结果的不确定度进行了分析.结果表明探测器的灵敏度随着晶体厚度的增加而增加,对于一定厚度的薄闪烁体,随着中子能量的增加,探测器的能量响应曲线坡度不大.
关键词:
塑料闪烁体
能量响应
正比计数器
半导体反冲质子望远镜 相似文献
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郑永男 周冬梅 袁大庆 左翼 范平 M. Mihara K. Matsuta M. Fukuda T. Minamisono T. Suzuki 徐勇军 朱佳政 王志强 骆海龙 张锡珍 朱升云 《中国物理快报》2010,(2):58-60
Magnetic moments of the A=12 unstable mirror pair nuclides 12B and 12N have been measured by the β-NMR technique. The experimentally measured magnetic moments are μ(12B)=1.001(17)μN and μ(12N)=0.4571(1)μN. The improved shell model using an SFO Hamiltonian with enhanced spin-isospin monopole proton-neutron interaction and modified single-particle energies is employed to calculate the magnetic moments of 12B and 12N. The calculation yields μ (12B)=0.929μN and μ(12N)=0.452μN and has produced a new magic number 6 for the short-lived unstable mirror pair nuclides 12B and 12N. 相似文献
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周冬梅郑永男 朱佳政徐勇军杜恩鹏 王志强骆海龙袁大庆 容超凡M.Mihara M.Fukuda K.Matsuta T.Minamisono 朱升云 《中国物理快报》2003,20(10):1698-1701
The β-NMR (nuclear magnetic resonance) and β-NQR (nuclear quadrupole resonance) technique and its ex-perimental set-up have been developed for the first time in China. The lifetime, magnetic moment and spin polarization of ^12B were determ/ned. The experimental results show the reliability of this newly developed β-NMR and β-NQR set-up. 相似文献
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