Abstract
To investigate the interplay between collective and single particle degrees of freedom in odd nuclei, Recoil distance Doppler-shift and Doppler-shift attenuation lifetime measurements were carried out for levels in 155Dy in coincidence detection of gamma-rays. 26 lifetimes were determined using the Differential decay curve method. Particle plus triaxial rotor model (PTRM) calculations were performed to compare the experimental level scheme and transition strengths with theoretical ones in order to get information on the quadrupole deformation (є,γ) of the bands. As a result, different quadrupole deformations for the one-quasineutron bands at low and medium spins are deduced.
Highlights
The nucleus 155 Dy is positioned in the mass region A∼150 [1], which is characterized by a rapid shape transition
The results from our analysis of the Recoil distance Doppler-shift (RDDS) data are 18 lifetimes determined in 6 different bands, all of them for the first time
From the Doppler-shift attenuation method (DSAM) data, 10 lifetimes have been determined in Band 6 and Band 7
Summary
The nucleus 155 Dy is positioned in the mass region A∼150 [1], which is characterized by a rapid shape transition. The main goal of the present work was to measure electromagnetic transition strengths, at low, intermediate and high spins in the different bands observed. Dy was available before the present study only at high spins [2]. We performed lifetime measurements using the Recoil distance Doppler-shift (RDDS) and Doppler-shift attenuation method (DSAM). The second aim of the study was to perform PTRM calculations of the level scheme and transition strengths. On the basis of the comparison between experiment and theory, conclusions are made about the nuclear structure and the collectivity of 155 Dy
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