Hindered E1 decay of the 6 keV individual particle state of73Ta181

Half-life of the 6.21 keV level in181Ta

“…The result obtained in the present study is significantly lower than those previously published by Hauser [1] and Clark [2]. In both studies thin NaI(TI) crystals were used for the tantalum K X-ray detection and proportional counters for the detection of the 6.21keV 7-ray and the tantalum L Xrays.…”

“…The spectrum of the 6.21 keV 7-rays and the L X-rays was measured in coincidence with the K Xrays for several fixed delay times. From these experiments values of about 10gs [1] and (6.1 +0.7)Its [2] have been deduced for the half-life. In a second set of experiments the TAC method had been applied resulting in values of (6.8• [1] and (7.0 • [2].…”

“…From these experiments values of about 10gs [1] and (6.1 +0.7)Its [2] have been deduced for the half-life. In a second set of experiments the TAC method had been applied resulting in values of (6.8• [1] and (7.0 • [2]. Both authors come to final average values of TI/2 =(6.8 +0.4) ~ts [1,2].…”

“…Earlier measurements of the half-life of the 6.21 keV level [1,2] date back to 1961 and were performed with detectors of poor energy resolution and with relatively unsophisticated electronics. In both studies an uncertainty of 6~o on the half-life was quoted.…”

Influence of pairing correlations on E1 transition probabilities in odd-mass deformed, rare-earth nuclei

“…The retardation of EI transitions in deformed nu<:;lei has been the subject of several papers [1][2][3][4][5][6][7] in the past few years .. The reduction factor E of a tra,nsition is defined as equal to the ratio of the theoretical to the experimental tninsitio~ probabilities.…”