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Stability of the N=50 shell gap in the neutron-rich Rb, Br, Se, and Ge isotones

Zhang, YH, Podolyak, Z, de Angelis, G, Gadea, A, Ur, C, Lunardi, S, Marginean, N, Rusu, C, Schwengner, R, Kroll, T, Napoli, DR, Menegazzo, R, Bazzacco, D, Farnea, E, Lenzi, S, Martinez, T, Axiotis, M, Tonev, D, Gelletly, W, Langdown, S, Regan, PH, Dobon, JJV, von Oertzen, W, Rubio, B, Quintana, B, Medina, N, Broda, R, Bucurescu, D, Ionescu-Bujor, M and Iordachescu, A (2004) Stability of the N=50 shell gap in the neutron-rich Rb, Br, Se, and Ge isotones PHYSICAL REVIEW C, 70 (2). ? - ?. ISSN 0556-2813


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The low- and medium-spin states of the N=50 neutron-rich, Rb-87(37), Br-85(35), Se-84(34) and Ge-82(32) isotones have been populated in deep-inelastic processes produced by the interaction of 460 MeV Se-82 ions with a Os-192 target. The subsequent gamma decay has been investigated at the Laboratori Nazionali di Legnaro using the GASP gamma-ray detector array. The comparison of the experimentally observed excited states with shell-model calculations performed with and without neutron degrees of freedom has allowed the investigation of the role of the neutron-core breaking excitations and therefore of the N=50 shell gap. The inclusion of neutron configurations in the shell-model calculations results in an improved agreement between the experimental and calculated level energies at medium and high spin. These results highlight the considerable contribution of neutron-core particle-hole excitations across the N=50 shell gap to the level configurations. The overall agreement of the measured excited states with the shell-model predictions is indicative of the persistence of the N=50 shell gap down to Z=32.

Item Type: Article
Uncontrolled Keywords: Science & Technology, Physical Sciences, Physics, Nuclear, Physics, N = 20, HEAVY-ION COLLISIONS, DRIP-LINE NUCLEI, SE-82(T,P)SE-84 REACTION, COULOMB-EXCITATION, EXCITED-STATES, RB-87, ISOTOPES, ISOMER, DECAY
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Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:08
Last Modified: 23 Sep 2013 18:27

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