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beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes

Alkhomashi, N, Regan, PH, Podolyak, Z, Pietri, S, Garnsworthy, AB, Steer, SJ, Benlliure, J, Caserejos, E, Casten, RF, Gerl, J, Wollersheim, HJ, Grebosz, J, Farrelly, G, Gorska, M, Kojouharov, I, Schaffner, H, Algora, A, Benzoni, G, Blazhev, A, Boutachkov, P, Bruce, AM, Bacelar, AMD, Cullen, IJ, Caceres, L, Doornenbal, P, Estevez, ME, Fujita, Y, Gelletly, W, Hoischen, R, Kumar, R, Kurz, N, Lalkovski, S, Liu, Z, Mihai, C, Molina, F, Morales, AI, Muecher, D, Prokopowicz, W, Rubio, B, Shi, Y, Tamii, A, Tashenov, S, Valiente-Dobon, JJ, Walker, PM, Woods, PJ and Xu, FR (2009) beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes PHYSICAL REVIEW C, 80 (6). ? - ?. ISSN 0556-2813

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The low-lying structure of 188,190,192Whave been studied following beta-decays of the neutron-rich mother nuclei 188,190,192Ta, produced following the projectile fragmentation of a 1 GeV per nucleon 208Pb primary beam on a natural Be target at the GSI Fragment Separator. The beta-decay half lives of 188,190,192Ta have been measured, together with gamma-ray decays of low-lying states in their respective W daughter nuclei using heavy-ion-beta-gamma correlations utilising a position sensitive silicon detector set-up. The data provide information on the low-lying excited states in 188,190,192W, which highlight a change in nuclear shape at 190W compared with lighter W isotopes. This evolution of ground state structure along the W isotopic chain is discussed as evidence for a possible proton sub-shell effect for the A 190 region and is consistent with the maximisation of the -softness of the nuclear potential around N 116.

Item Type: Article
Additional Information: Copyright 2009 The American Physical Society.
Uncontrolled Keywords: Science & Technology, Physical Sciences, Physics, Nuclear, Physics, RELATIVISTIC HEAVY-IONS, ISOMER SPECTROSCOPY, ATOMIC-NUCLEI, STATES, FRAGMENTATION, O(6), W-190(116), STABILITY, SYMMETRY, PT-196
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Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Symplectic Elements
Date Deposited: 11 Jan 2012 12:09
Last Modified: 23 Sep 2013 18:58

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