학술논문
Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive $^{222}$Ra and $^{228}$Ra Beams
Document Type
Working Paper
Author
Butler, P. A.; Gaffney, L. P.; Spagnoletti, P.; Abrahams, K.; Bowry, M.; Cederkäll, J.; De Angelis, G.; De Witte, H.; Garrett, P. E.; Goldkuhle, A.; Henrich, C.; Illana, A.; Johnston, K.; Joss, D. T.; Keatings, J. M.; Kelly, N. A.; Komorowska, M.; Konki, J.; Kröll, T.; Lozano, M.; Singh, B. S. Nara; O'Donnell, D.; Ojala, J.; Page, R. D.; Pedersen, L. G.; Raison, C.; Reiter, P.; Rodriguez, J. A.; Rosiak, D.; Rothe, S.; Scheck, M.; Seidlitz, M.; Shneidman, T. M.; Siebeck, B.; Sinclair, J.; Smith, J. F.; Stryjczyk, M.; Van Duppen, P.; Vinals, S.; Virtanen, V.; Warr, N.; Wrzosek-Lipska, K.; Zielińska, M.
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Subject
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Abstract
There is sparse direct experimental evidence that atomic nuclei can exhibit stable pear shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole ($E3$) matrix elements have been determined for transitions in $^{222,228}$Ra nuclei using the method of sub-barrier, multi-step Coulomb excitation. Beams of the radioactive radium isotopes were provided by the HIE-ISOLDE facility at CERN. The observed pattern of $E$3 matrix elements for different nuclear transitions is explained by describing $^{222}$Ra as pear-shaped with stable octupole deformation, while $^{228}$Ra behaves like an octupole vibrator.
Comment: to be published in Physical Review Letters
Comment: to be published in Physical Review Letters