Eur. Phys. J. A (2017) 53: 25
https://doi.org/10.1140/epja/i2017-12212-y

Regular Article - Experimental Physics

Magnetic rotation phenomenon in the dipole () bands of transitional strontium (Sr) isotopes near N=50 shell closure

¹ Department of Physics and Astrophysics, University of Delhi, 110007, Delhi, India
² Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, 400005, Mumbai, India

^* e-mail: bhardwaj.physics10@gmail.com

Received: 21 October 2015
Accepted: 23 January 2017
Published online: 14 February 2017

Abstract

The lifetime measurements were done for the transitions of the dipole () bands in ^85,86Sr nuclei using the Doppler Shift Attenuation Method (DSAM). The high-spin states in these nuclei were populated in the ⁷⁶Ge(¹³C, 4n)⁸⁵Sr and ⁷⁶Ge(¹³C, 3n)⁸⁶Sr reactions. The B(M1) transition rates have been obtained for the states of two positive-parity dipole () bands in the ⁸⁵Sr nucleus and one positive-parity dipole () band in the ⁸⁶ Sr nucleus. The present results on the transition rates are important to know whether these dipole () bands have the signatures of Magnetic Rotation (MR). In order to investigate their magnetic character, the experimental results have been compared with the calculations within the framework of hybrid Tilted-Axis-Cranking (TAC) model. On the basis of the TAC calculations, band 2 of the ⁸⁵Sr nucleus is assigned the configuration and shows the MR character, while for band 3, the configuration is suggested. In the case of ⁸⁶Sr nucleus, band 3 has the configuration below the spin and above this spin the configuration plays an important role. The experimental B(M1) transition rates show a decreasing trend with the increase in spin and are comparable with the TAC calculations before the .