Facility for the (p, n) polarization transfer measurement
Facility for the (p, n) polarization transfer measurement
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(p, n) 偏振传输测量设备
DOI：
10.1016/0168-9002(95)00716-4
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发表时间：
1996
影响因子：
1.4
通讯作者：
K. Hatanaka
中科院分区：
文献类型：
--
作者：
H. Sakai;H. Okamura;H. Otsu;T. Wakasa;S. Ishida;N. Sakamoto;T. Uesaka;Y. Satou;S. Fujita;K. Hatanaka
我们设计并建造了一个装置来测量中间能量下 (p, n) 反应的完整偏振传递系数 Dij。该设施由用于角分布测量的摆束偶极磁体和用于通过飞行时间法测量中子能量的 100 m 隧道组成。对于 290 MeV 中子，典型的中子能量分辨率约为 1.85 MeV，其中包括由于靶厚度而产生的 1 MeV 贡献。与该隧道系统相关的背景经过仔细研究，发现其小到可以忽略不计。用于中子自旋旋转的偶极磁体安装在中子飞行路径中，以测量纵向极化和感生极化。搭建了由6个平面二维位敏中子探测器组成的中子旋光计，尺寸为1 m×1 m×0.1 m。其有效左右分析能力〈Ayeff〉已被校准为194、290和384 MeV。 〈Ayeff〉2× εDSat 290 MeV 定义的品质因数值为 4.05 × 10−4，其中 εDS 是双散射效率。
We have designed and constructed a facility to measure the complete polarization transfer coefficient Dijfor the (p, n) reaction at intermediate energies. The facility consists of a beam swinger dipole magnet used for angular distribution measurements and a 100 m tunnel for the neutron energy measurement by the time-of-flight method. Typical neutron energy resolution is about 1.85 MeV for 290 MeV neutrons including a contribution of 1 MeV due to the target thickness. The background associated with this tunnel system was carefully investigated and found to be negligibly small. A dipole magnet for the neutron spin rotation is installed in the neutron flight path to measure the longitudinal polarization as well as the induced polarization. The neutron polarimeter which consists of 6 planes of the two-dimensional position-sensitive neutron detectors with a size of 1 m × 1 m × 0.1 m has been constructed. Its effective left-right analyzing power 〈Ayeff〉 has been calibrated at 194, 290 and 384 MeV. The figure-of-merit value defined by 〈Ayeff〉2× εDSat 290 MeV is 4.05 × 10−4, where εDSis the double scattering efficiency.