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Binary-reaction spectroscopy of Mo-99,Mo-100: Intruder alignment systematics in N=57 and N=58 isotones

Regan, PH, Yamamoto, AD, Xu, FR, Wu, CY, Macchiavelli, AO, Cline, D, Smith, JF, Freeman, SJ, Valiente-Dobon, JJ, Andgren, K, Chakrawarthy, RS, Cromaz, M, Fallon, P, Gelletly, W, Gorgen, A, Hayes, A, Hua, H, Langdown, SD, Lee, IY, Pearson, CJ, Podolyak, Z, Teng, R and Wheldon, C (2003) Binary-reaction spectroscopy of Mo-99,Mo-100: Intruder alignment systematics in N=57 and N=58 isotones PHYSICAL REVIEW C, 68 (4). ? - ?. ISSN 0556-2813


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The near-yrast states of Mo-99,Mo-100 have been studied following their population via a binary reaction between a Xe-136 beam and a thin, self-supporting Mo-100 target. The yrast sequence in Mo-100 has been extended to a tentative spin/parity (20(+)), while the decoupled band built on the I-pi=11(-)/2 isomeric state in Mo-99 has been extended through the first alignment up to a tentative spin/parity of (43(-)/2). The results are compared with self-consistent, cranked-mean-field calculations using a Woods-Saxon potential. The alignment systematics of the intruder h(11/2) bands in the N=57 isotones from Mo (Z=42) to Cd (Z=48) and the yrast sequences in their N=58 even-even neighbors are discussed. An overall picture emerges, where the alignment properties evolve from being due to positive-parity neutrons in the Cd-105(48) to predominantly (g(9/2))(2) proton crossings closer to the Z=40 subshell. Qualitatively, this can be explained by an increase in the quadrupole deformation and a simultaneous lowering of the proton Fermi surface in the g(9/2) shell with decreasing proton number. These data provide excellent examples of rotational-alignment phenomena in weakly deformed nuclei.

Item Type: Article
Uncontrolled Keywords: Science & Technology, Physical Sciences, Physics, Nuclear, Physics, RARE-EARTH NUCLEI, NEUTRON ALIGNMENTS, SPIN STATES, GAMMASPHERE, ISOTOPES, PD-108, REGION, CD-105, PROTON, SHAPE
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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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