Energy and angular distribution of photo-neutrons for 16.6 MeV polarized photon on medium?heavy targets
Energy and angular distribution of photo-neutrons for 16.6 MeV polarized photon on medium?heavy targets
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中重目标上16.6 MeV偏振光子的光中子能量和角分布
DOI：
10.1016/j.nima.2020.164965
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Asano Yoshihiro
中科院分区：
文献类型：
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作者：
Kim Tuyet Tran;Sanami Toshiya;Yamazaki Hirohito;Itoga Toshiro;Takeuchi Akihiro;Namito Yoshihito;Miyamoto Shuji;Asano Yoshihiro
测量了16.6 MeV线偏振光在Pb，Au，Sn，Cu，Fe和Ti靶上的（γ，xn）反应的能谱和光中子角分布，称为双微分截面（DDXs）。在BL 01，NewSUBARU，Hyogo，Japan使用激光康普顿散射技术制备偏振光子。光中子的测量使用液体有机闪烁器，放置在六个不同的角度。飞行时间技术被用来确定中子能量。对所有靶标鉴定了DDX上的低能量和高能量组分。对于低能量分量观察到平坦的角度依赖性;然而，对于高能量分量观察到cos（2 Θ）分布，其中Θ是光子偏振方向和中子发射之间的角度。通过对实验数据的拟合，对角度依赖性进行了参数化。所获得的参数与几十年前进行的先前研究进行了比较。
The energy spectra as well as the angular distribution of photo-neutrons, called the double differential cross sections (DDXs) of the (γ, xn) reaction were measured for 16.6 MeV linearly polarized photons on Pb, Au, Sn, Cu, Fe, and Ti targets. Polarized photons were prepared using the laser Compton scattering technique at BL01, NewSUBARU, Hyogo, Japan. The photo-neutrons were measured using liquid organic scintillators, placed at six different angles. The time-of-flight technique was used to determine the neutron energy. The low energy and high energy components on the DDXs were identified for all the targets. Flat angular dependence was observed for the low energy component; however, a cos (2 Θ) distribution was observed for the high energy component, where Θ is the angle between the photon polarization direction and neutron emission. The angular dependences were parameterized by fitting the experimental data. The obtained parameters were compared with those from previous studies conducted decades ago.