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Coulomb Excitation of $^{80}$Sr and the limits of the $N = Z = 40$ island of deformation by Russell, R.; Heery, J.; Henderson, J.; Wadsworth, R.; Kaneko, K.; Shimizu, N.; Mizusaki, T.; Sun, Y.; Andreoiu, C.; Annen, D. W.; Avaa, A. A.; Ball, G. C.; Bildstein, V.; Buck, S.; Cousins, C.; Garnsworthy, A. B.; Gillespie, S. A.; Greaves, B.; Grimes, A.; Hackman, G.; Hughes, R. O.; Jenkins, D. G.; Kowalewski, T. M.; Martin, M. S.; Müller-Gatermann, C.; Murias, J. R.; Murillo-Morales, S.; Pascu, S.; Rhodes, D. M.; Smallcombe, J.; Spagnoletti, P.; Svensson, C. E.; Wallis, B.; Williams, J.; Wu, C. Y.; Yates, D. is a scholarly article available to read on EtoBox.

What is Coulomb Excitation of $^{80}$Sr and the limits of the $N = Z = 40$ island of deformation about?

The region of $N\approx Z\approx 40$ has long been associated with strongly deformed nuclear configurations. The presence of this strong deformation was recently confirmed through lifetime measurements in $N\approx Z$ Sr and Zr nuclei. Theoretically, however, these nuclei present a challenge due to the vast valence space required to incorporate all deformation driving interactions. Recent state-of-the-art predictions indicate a near axial prolate deformation for $N=Z$ and $N=Z+2$ nuclei between $N=Z=36$ and $N=Z=40$. In this work we investigate the shores of this island of deformation through a sub-barrier Coulomb excitation study of the $N=Z+4$ nucleus, \textsuperscript{80}Sr. Extracting a spectroscopic quadrupole moment of $Q_s(2^+_1) = 0.45^{+0.83}_{-0.88}$~eb, we find that \textsuperscript{80}Sr is inconsistent with significant axial prolate deformation. This indicates that the predicted region of strong prolate deformation around $N=Z=40$ is tightly constrained to the quartet of nuclei: \textsuperscript{76,78}Sr and \textsuperscript{78,80}Zr.

Author

Russell, R.; Heery, J.; Henderson, J.; Wadsworth, R.; Kaneko, K.; Shimizu, N.; Mizusaki, T.; Sun, Y.; Andreoiu, C.; Annen, D. W.; Avaa, A. A.; Ball, G. C.; Bildstein, V.; Buck, S.; Cousins, C.; Garnsworthy, A. B.; Gillespie, S. A.; Greaves, B.; Grimes, A.; Hackman, G.; Hughes, R. O.; Jenkins, D. G.; Kowalewski, T. M.; Martin, M. S.; Müller-Gatermann, C.; Murias, J. R.; Murillo-Morales, S.; Pascu, S.; Rhodes, D. M.; Smallcombe, J.; Spagnoletti, P.; Svensson, C. E.; Wallis, B.; Williams, J.; Wu, C. Y.; Yates, D.

Published

2024

Language

EN