PRECISE SEARCH FOR VIOLATION OF TIME-REVERSAL INVARIANCE IN NUCLEAR DECAY SUS IN GLOW-TEMPERATURE NUCLEAR POLARIZATION

精确搜索辉温核极化中核衰变SUS时间反转不变性的破坏

基本信息

批准号：
04452025
负责人：
OHYA Susumu
金额：
$ 4.42万
依托单位：
NIIGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452025/
关键词：
LOW-TEMPERATURE NUCLEAR ORIENTATION gamma DECAY TIME-REVERSAL INVARIANCE 核崩壊

项目摘要

Time-reversal invariance in the gamma transitions were investigated by observing the angular distribution of the linear polarization of the mixed (E2, M1) gamma transitions in ^<192>Pt from a source of ^<192>IrFe polarized at a low temperature of 9.3 (1) mK.As the polarimeters, four thin disk-type (two 44mmPHIx15mm, two 51mmPHIx20mm) detectors were used. The linear polarization could be detected in single gamma-ray measurements by these detectors. By this method it is possible to measure the linear polarization with high energy resolution without troubles of coincidence circuits. They were placed at the symmetric positions each other and at the angles of 54.7 and 125.3 degree with respect to the spin direction. The asymmetries of the 308-, 484- and 604-ke Vgamma rays were measured. Values of phase angles of sin (eta+xi) were obtained to be 1(14) x10^<-3>,0 (30) x10^<-3> and 2.1 (53) x10^<-3> for the 308-, 484- and 604-ke Vgamma transitions, respectively. These results are consistent with time reversal invariance.In order to improve the polarization sensitivity we employed more thinner detectors (two 51mmPHIx7mm) . The measurements were performed for about 35 days. Now the result of the value ofsin (eta+xi) for the 604-keV transition were tentatively obtainde ; -26 (25) x10^<-4>, -80 (74) x10^<-4>, -30 (28) x10^<-4>,90 (94) x10^<-4> for the detector Nos.1-4 respectively. Detailed analyzes are now in progress.

通过观察 ^<192> pt中混合（E2，M1）伽马过渡的线性极化的角度分布，从 ^<192> pt中的 ^<192> irfe源以9.3（1）Mk.的低温（1）Mk.作为极地disthimeters，四个the think-thek-ymmmphiack（ ^<192）> irfe（ ^<192）> pt（ ^<192）> pt两者（ ^<192）> pt两者（ ^<192）>两者（ ^<192）>两者，通过观察 ^<192> pt的混合（E2，M1）伽马过渡的线性极化的角度分布来研究伽马过渡的时间逆向不变。使用51mmphix20mm）检测器。这些检测器可以在单伽马射线测量中检测到线性极化。通过这种方法，可以通过高能分辨率测量线性极化，而不会偶然电路的麻烦。相对于自旋方向，它们彼此相互对称位置，其角度为54.7和125.3度。测量了308-，484和604-ke Vgamma射线的不对称性。对于308-，484-和604-ke vgamma transitions，sin（ETA+XI）的相位值为1（14）x10^<-3>，0（30）x10^<-3>和2.1（53）x10^<-3>。这些结果与时间逆转不变性一致。为了提高我们采用更薄的检测器（两个51mmphix7mm）的极化灵敏度。进行测量约35天。现在，暂时获得了604-KeV跃迁的值（ETA+XI）值的结果； -26（25）x10^<-4>，-80（74）x10^<-4>，-30（28）x10^<-4>，90（94）x10^<-4>分别为检测器NOS.1-4。现在正在进行详细的分析。