On the enhanced E1 transitions in the K = 3/2 parity doublet band in 223Ra

H. Mach; A. Lindroth; E. Ruchowska; J. Kvasil; B. Fogelberg; K. Gulda; A. J. Aas; M. J. G. Borge; I. S. Grant; E. Hagebø; W. Kurcewicz; T. Martinez; B. Rubio; J. F. Smith; K. Steffensen; J. L. Tain; O. Tengblad; T. F. Thorsteinsen

doi:10.1140/epja/i2016-16172-4

EPJ

On the enhanced E1 transitions in the K = 3/2 parity doublet band in ²²³Ra

H. Mach¹^,2, A. Lindroth², E. Ruchowska¹, J. Kvasil³, B. Fogelberg², K. Gulda⁴^,1, A. J. Aas⁵, M. J. G. Borge⁶, I. S. Grant⁷, E. Hagebø⁵, W. Kurcewicz⁴^*, T. Martinez⁸, B. Rubio⁸, J. F. Smith⁹, K. Steffensen⁵, J. L. Tain⁸, O. Tengblad⁶^,10 and T. F. Thorsteinsen¹¹

¹ National Centre for Nuclear Research, BP1, Hoża 69, PL 00-681, Warsaw, Poland
² Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20, Uppsala, Sweden
³ Department of Nuclear Physics, Charles University, V Holesovičkach 2, 18000, Prague 8, Czech Republic
⁴ Faculty of Physics, University of Warsaw, Pasteura 5, PL 02-093, Warsaw, Poland
⁵ Department of Chemistry, University of Oslo, P.O. Box 1033, N-0315, Oslo, Norway
⁶ Insto. De Estructura de la Materia, CSIC, E-28006, Madrid, Spain
⁷ Schuster Laboratory, University of Manchester, M13 9PL, Manchester, UK
⁸ Insto. de Física Corpuscular, CSIC-Univ. Valencia, E-46100, Burjassot, Spain
⁹ Oliver Lodge Laboratory, University of Liverpool, L69 7ZE, Liverpool, UK
¹⁰ PPE Division, CERN, CH-1211, Geneva 23, Switzerland
¹¹ Department of Physics, University of Bergen, N-5007, Bergen, Norway

Received: 13 March 2016
Revised: 17 May 2016
Accepted: 28 May 2016
Published online: 24 June 2016

Abstract

We have applied the fast timing $\beta\gamma\gamma (t)$ technique to remeasure lifetimes of selected states in ²²³Ra populated in the $\beta^{-}$ decay of ²²³Fr. $T_{1/2}=587(12)$ ps and 210(13)ps have been obtained for the $3/2^{-}$ and $5/2^{-}$ states at 50.1 and 79.7 keV, that are more accurate than the previous values of 630(70)ps and 166(55)ps, respectively. Our $\vert D_{0}\vert$ value of 0.155(10)e·fm obtained for the $ K=3/2$

configuration together with the available values of $\vert D_{0}\vert$ for the $ K=1/2$

and

parity doublet bands establish the configuration dependence of $\vert D_{0}\vert$ at low spins in this nucleus. Results of theoretical calculations performed for ²²³Ra, using the quasiparticle-phonon model (QPM) with inclusion of the Coriolis coupling, reasonably well reproduce octupole correlations in this nucleus.

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EPJ

On the enhanced E1 transitions in the K = 3/2 parity doublet band in 223Ra

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On the enhanced E1 transitions in the K = 3/2 parity doublet band in ²²³Ra