Photodisintegration of deuterium by linearly polarized gamma rays

线偏振伽马射线对氘的光分解

基本信息

批准号：
16340080
负责人：
UTSUNOMIYA Hiroaki
金额：
$ 8.26万
依托单位：
KONAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Linearly polarized γ rays were produced in the inverse Compton scattering of linearly polarized photons from a Nd : YVO_4 laser with relativistic electrons in the storage ring TERAS at the National Institute of Advanced Industrial Science and Technology. An encapsulated deuterated liquid scintillator (BICRON BC-537) was irradiated with polarized γ ray beams at 2.5 and 3.0 MeV. The target scintillator served as an active target. Four neutron detectors, each consisting of five ^3He proportional counters embedded in a polyethylene were mounted at 90° with respect to the y-ray beam; a pair of neutron detectors was mounted parallel to the electric field of the linearly polarized γ rays and the other pair was mounted perpendicular to the electric field. Anisotopic neutron emissions were observed in the photodisintegration of deuterium. The ratio of M1 and E1 components in photodisintegration of deuterium was determined from the anisotropy. Cross talks of neutron events between the detectors were simulated with a Monte Carlo code MCNP. The cross-talk effect was taken into account in the data analysis. It was found that the ratio is consistent with theoretical predictions at both energies. We will perform a systematic measurement of the M1 and E1 photodisintegration of deuterium in the energy region of direct relevance to big bang nucleosynthesis.

在国家先进工业科学技术研究院的存储环Teras中，来自ND：YVO_4激光的线性极化照片的逆综合散射中产生线性极化的γ射线。用偏振γ射线梁在2.5和3.0 meV处辐照了包裹的氘化液体闪光灯（Bicron BC-537）。目标闪光灯是主动目标。四个中子探测器，每个探测器由嵌入聚乙烯中的五个 ^3he比例计数器组成，相对于Y射线束在90°°组成；将一对中子检测器平行于线性极化γ射线的电场平行安装，另一对垂直于电场安装。在氘的光分散化中观察到各向异性中子排放。从各向异性确定氘的光分散性中M1和E1成分的比率。用蒙特卡洛代码MCNP模拟了探测器之间的中子事件的串扰。在数据分析中考虑了串扰效应。发现该比率与两个能量的理论预测一致。我们将对在与大爆炸核合成直接相关的能量区域中的M1和E1光分散性进行系统测量。

项目成果

期刊论文数量（25）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Photonuclear reaction studies at synchrotron radiation facilities in Japan

日本同步加速器辐射设施的光核反应研究

DOI：
发表时间：
2004
期刊：
Nuclear, Physics Vol.A738
影响因子：
0
作者：
H.Utsunomiya;et al.
通讯作者：
et al.

Photodisintegration cross section measurements on ^<186>W, ^<187>Re, and ^<188>Os; Implications for the Re-Os cosmochronology

^<186>W、^<187>Re和^<188>Os的光崩解截面测量；

DOI：
发表时间：
2005
期刊：
Phys. Rev. 72
影响因子：
0
作者：
T.Shizuma;H.Utsunomiya;P.Mohr;T.Hayakawa;S.Goko;A.Makinaga;H.Akimune;T.Yamagata;M.Ohta;H.Ohgaki;Y.-W.Lui;H.Toyokawa;A.Uritani;S.Goriely
通讯作者：
S.Goriely

Measurement of Photo-Desctruction Cross Sections for ^<180>Ta at SPring-8

SPring-8处^ 180 Ta的光破坏横截面的测量