The Level Structure of Tm^<169>

概要

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The eneruies and intensities of various :amma rav transitions in Tm"' nuclidepopulated in the electron capture decay of Yb"' have been measured usinga 64.1 cc. Ge(Li) detector coupled with 4096 charmel analyser. The coincidencemeasurements have been made using Ge(Li)-Nal(Tl) slow-fast coincidence set up.The singles and coincidence measurements confirm the existance of 285, 295, 304.0,328.0, 336.5, 354.7, 370.8, 579.5 and 600.3 keV 7-transitions from the decay ofYb"'. The presence of 718.5 keV level in the level scheme of Tm"' is alsoconfirmed from the electron capture decay of Yb"'. In addition to the energy andintensity measurements, gamma-gamma angular correlation measurements onfive cascades, namely 198-118, 198-110, 261 -110, 177-130 and 177-(21)-1l0keVhave been done using Ge(Li)-Nal(Tl) fast coincidence set up. Out of these,the 261-1 10 keV cascade has been attempted for the first time. On the basis ofthese measurements, the multipole mixing in 261, 198, 177, 130 and 1IOkeV7-transitions have been calculated. A comparison of experimental transitionprobabilities with those of single particle estimates show a collective behaviourof Tm"' nucleus.
社団法人日本物理学会の論文
1978-08-15