CERN Accelerating science

Article
Report number	arXiv:2001.09681
Title	Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive $^{222}\mathrm{Ra}$ and $^{228}\mathrm{Ra}$ Beams
Author(s)	Butler, P.A. (U. Liverpool (main)) ; Gaffney, L.P. (U. Liverpool (main) ; CERN) ; Spagnoletti, P. (Paisley U.) ; Abrahams, K. (Western Cape U.) ; Bowry, M. (Paisley U. ; TRIUMF) ; Cederkäll, J. (Lund U.) ; de Angelis, G. (INFN, Legnaro) ; De Witte, H. (Leuven U.) ; Garrett, P.E. (Guelph U.) ; Goldkuhle, A. (Cologne U.) ; Henrich, C. (Darmstadt, Tech. U.) ; Illana, A. (INFN, Legnaro) ; Johnston, K. (CERN) ; Joss, D.T. (U. Liverpool (main)) ; Keatings, J.M. (Paisley U.) ; Kelly, N.A. (Paisley U.) ; Komorowska, M. (Warsaw U., Heavy Ion Lab) ; Konki, J. (CERN) ; Kröll, T. (Darmstadt, Tech. U.) ; Lozano, M. (CERN) ; Nara Singh, B.S. (Paisley U.) ; O'Donnell, D. (Paisley U.) ; Ojala, J. (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Page, R.D. (U. Liverpool (main)) ; Pedersen, L.G. (Oslo U.) ; Raison, C. (York U., England) ; Reiter, P. (Cologne U.) ; Rodriguez, J.A. (CERN) ; Rosiak, D. (Cologne U.) ; Rothe, S. (CERN) ; Scheck, M. (Paisley U.) ; Seidlitz, M. (Cologne U.) ; Shneidman, T.M. (Dubna, JINR) ; Siebeck, B. (Cologne U.) ; Sinclair, J. (Paisley U.) ; Smith, J.F. (Paisley U.) ; Stryjczyk, M. (Leuven U.) ; Van Duppen, P. (Leuven U.) ; Vinals, S. (CSIC, Madrid) ; Virtanen, V. (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Warr, N. (Cologne U.) ; Wrzosek-Lipska, K. (Warsaw U., Heavy Ion Lab) ; Zielińska, M. (IRFU, Saclay)
Publication	2020-02-01
Imprint	2020-01-27
Number of pages	6
Note	to be published in Physical Review Letters
In:	Phys. Rev. Lett. 124 (2020) 042503
DOI	10.1103/PhysRevLett.124.042503
Subject category	physics.atom-ph ; Other Fields of Physics ; nucl-th ; Nuclear Physics - Theory ; hep-ph ; Particle Physics - Phenomenology ; nucl-ex ; Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN ISOLDE ; HIE ISOLDE
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.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2020-2025 authors (License: CC-BY-4.0)

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