The results obtained from electron and in-beam spectroscopy experiments reveal that the 44 S nucleus is located in a transitional region between the spherical 48 Ca and the oblate 42 Si. The comparison of the results with Large Scale Shell Model calculations points towards prolate-spherical shape coexistence where the ground state becomes the intruder configuration due to quadrupole excitations across the Z = 14 and N = 28 shell gaps.

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British Library Cataloguing-in-Publication Data A catalogue record for this book is available from the British Library. Cover design by E. CherepanovCover photo by A. Popeko Photos compilation