Symmetries in mirror nuclei 31S and 31P
Instittute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Tzarigradsko chaussee 72 Blvd. BG-1784, Sofia, Bulgaria
2 INFN, Laboratori Nazionali di Legnaro, Legnaro, Italy
3 CSNSM, CNRS and Université Paris-Sud XI, 91405 Orsay Campus, France
4 Department of Nuclear Physics, CIAE, Beijing, P.R. China
5 Dipartimento di Fisica and INFN Padova, Padova, Italy
6 University of Jyväskylä, Jyväskylä, Finland
7 Inter-university Accelerator Centre, New Delhi, India
8 Ludwig-Maximilians Universität München, Germany
* e-mail: Dimitar.Tonev@inrne.bas.bg
Published online: 14 November 2018
Excited states in mirror nuclei 31S and 31P were populated in the 1n and 1p exit channels, respectively, of the reaction 20Ne + 12C. The beam of 20Ne, with an energy of 33 MeV, was delivered for the first time by the Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro. Angular correlations of coincident pairs and Doppler-shift attenuation lifetime measurements in 31S and 31P were performed using the multidetector array GASP in conjunction with the EUCLIDES charged particle detector. A comparison of the determined B(E1) strengths of the analog mirror 7/2- → 5/2+ transitions indicates the presence of a violation of isospin symmetry.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.