Nuclear Structure Study Using Low-Temperature Nuclear Orientation

随后在欧洲核子研究中心利用Isolde和Nicol装置对Au核区进行了实验。对于^&lt；184Gt；Au，发现了这两个异构体，它们的半衰期分别为53 S和12 S。这两个异构体的自旋分别为2，5或3，6。由于这种同位素的高度碎片化衰变和具有类似半衰期的初级离子的辐射强度过高，研究^&lt；181&gt；Au的时间分辨核取向是不可能的。因此，这种测量需要等待伊索尔德独立金梁的供应。为了取代^&lt；181&gt；autr-olno研究，在Nicol装置上对Z=82以下的富质子核基态性质的系统测量扩展到了最轻的可获得的Ir同位素^&lt；183-176；Ir。测量了同位素^&lt；183&gt；Ir，^&lt；182&gt；Ir，^&lt；180&gt；Ir，^&lt；179&gt；Ir(通过^&lt；183&gt；Hg的α衰变)、^&lt；178&gt；Ir(通过^&lt；182&gt；Hg的α衰变)和^&lt；176&gt；Ir(通过^&lt；180&gt；Hg的α衰变)的取向温度依赖关系。观察到了很大的影响，这些实验现在正在进行分析。在8MK的低温下，对^&lt；124&gt；ini进行了核磁共振测量。磁性超精细分裂频率为165.8(1)MHz。在已知磁矩^&lt；124&gt；i的条件下，测得超精细场为B&lt；Hf&gt；(^&lt；124&gt；ini)=30.08(8)T，在8mK，外加磁场为0.2T时，有效驰豫时间为3.7(7)S。

Following experiments for Au nuclear region have done at CERN using ISOLDE and NICOL facilities. For ^<184>Au, the two isomers are found and these half-life are 53 s and 12 s. The spin of the two isomers are proposed to be either 2, 5 or 3, 6. The intention to study Time Resolved Nuclear Orientation of ^<181>Au was rendered impossibly by the highly fragmented decay of this isotope and the overwhelming intensity of radiations from the ^<181>Hg primary implant which has comparable half-life. Accordingly this measurement needs to await the availability of separated gold beams at ISOLDE. To replace the ^<181>Au TR-OLNO study, the systematic measurement of ground state properties of proton rich nuclei below Z=82 implanted at the NICOL facility was extended to the lightest accessible Ir isotopes, ^<183-176>Ir. Measurements were made on the temperature depedence of orientation of the isotope ^<183>Ir, ^<182>Ir, ^<180>Ir, ^<179>Ir (by alpha decay of ^<183>Hg), ^<178>Ir (by alpha decay of ^<182>Hg) and ^<176>Ir (by alpha decay of ^<180>Hg). Large effects were observed and these experiments are now being analyzed.In Niigata Univ. NMR-ON measurements have been performed for ^<124>INi at low temperature of 8 mK. The magnetic hyperfine splitting frequency was determined to be 165.8 (1) MHz. With the known magnetic moment of ^<124>I, the hyperfine field could be determined as B_<HF>(^<124>INi)=30.08 (8) T. The effective relaxation time was determined to be 3.7 (7) s at 8 mK and with the external magnetic field of 0.2 T.