Data di Pubblicazione:
2007
Citazione:
Band structures extending to very high spin in 126Xe / C. Ronn Hansen, G. Sletten, G. B. Hagemann, B. Herskind, D. R. Jensen, P. Bringel, C. Engelhardt, H. Hubel, A. Neusser-Neffgen, A. K. Singh, M. P. Carpenter, R. V. F. Janssens, T. L. Khoo, T. Lauritsen, P. Bednarczyk, T. Byrski, D. Curien, G. Benzoni, A. Bracco, F. Camera, S. Leoni, R. M. Clark, P. Fallon, A. Korichi, J. Roccaz, A. Maj, J. N. Wilson, J.C. Lisle, T. Steinhardt, O. Thelen, S. W. Odegard. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 76:3(2007), pp. 034311.034311.1-034311.034311.16.
Abstract:
High-spin states in 126Xe have been populated in the 82Se(48Ca,4n)126Xe reaction in two experiments, one at
the VIVITRON accelerator in Strasbourg using the Euroball detector array, and a subsequent one with ATLAS
at Argonne using the Gammasphere Ge-detector array. Levels and assignments made previously for 126Xe up
to I = 20 have been confirmed and extended. Four regular bands extending to a spin of almost I = 60, which
are interpreted as two pairs of signature partners with opposite parity, are identified for the first time. The α = 0 partner of each pair is connected to the lower-lying levels, whereas the two α = 1 partners remain floating. A
fractional Doppler shift analysis of transitions in the strongest populated (π, α) = (−, 0) band provides a value
of 5.20.4
0.5 b for the transition quadrupole moment, which can be related to a minimum in the potential-energy
surface calculated by the ULTIMATE CRANKER cranked shell-model code at ≈ 0.35 and γ ≈ 5◦. The four lowest
bands calculated for this minimum compare well with the two signature pairs experimentally observed over a
wide spin range. A sharp upbend at ¯hω ∼ 1170 keV is interpreted as a crossing with a band involving the j15/2
neutron orbital, for which pairing correlations are expected to be totally quenched. The four long bands extend
to within ∼5 spin units of a crossing with an yrast line defined by calculated hyperdeformed transitions and will
serve as important stepping stones into the spin region beyond 60¯h for future experiments.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
C. Ronn Hansen, G. Sletten, G. B. Hagemann, B. Herskind, D. R. Jensen, P. Bringel, C. Engelhardt, H. Hubel, A. Neusser-Neffgen, A. K. Singh, M. P. Carpenter, R. V. F. Janssens, T. L. Khoo, T. Lauritsen, P. Bednarczyk, T. Byrski, D. Curien, G. Benzoni, A. Bracco, F. Camera, S. Leoni, R. M. Clark, P. Fallon, A. Korichi, J. Roccaz, A. Maj, J. N. Wilson, J.C. Lisle, T. Steinhardt, O. Thelen, S. W. Odegard
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