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.

通过观察来自 ^<192>IrFe 源的 ^<192>Pt 中混合 (E2, M1) 伽马跃迁的线性偏振的角分布来研究伽马跃迁的时间反转不变性。 9.3（1）mK.作为旋光仪，四片薄盘型（两个44mmPHIx15mm，两个51mmPHIx20mm）使用了探测器。这些探测器可以在单次伽马射线测量中探测到线性偏振。通过这种方法，可以以高能量分辨率测量线性偏振，而无需符合电路的麻烦。它们被放置在彼此对称的位置，并且相对于自旋方向成54.7度和125.3度的角度。测量了 308-、484-和 604-ke Vgamma 射线的不对称性。 308 的 sin (eta+xi) 相位角值为 1(14) x10^<-3>、0 (30) x10^<-3> 和 2.1 (53) x10^<-3>分别为-、484-和604-ke Vgamma 跃迁。这些结果与时间反转不变性一致。为了提高偏振灵敏度，我们采用了更薄的探测器（两个51mmPHIx7mm）。测量进行了大约35天。现在初步得到了604-keV跃迁的sin(eta+xi)值结果； -26 (25) x10^<-4>, -80 (74) x10^<-4>, -30 (28) x10^<-4>,90 (94) x10^<-4> 用于检测器编号分别为.1-4。目前正在进行详细分析。