Coincidence recoil-distance Doppler-shift lifetime measurements in {sup 129,130}Ba with EUROBALL Ge cluster detectors

Journal Article · Sat Apr 01 04:00:00 EST 2000 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.61.044325· OSTI ID:20215890

Stuch, O ^[1]; Jessen, K ^[1]; Chakrawarthy, R S ^[1]; Dewald, A ^[1]; Kuehn, R ^[1]; Kruecken, R ^[1]; Petkov, P ^[1]; Peusquens, R ^[1]; Tiesler, H ^[1]; Weil, D ^[1]

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1. Institut fuer Kernphysik der Universitaet zu Koeln, Zuelpicher Str. 77, D-50937 Koeln, (Germany)

Picosecond lifetimes in {sup 129,130}Ba were determined using the recoil distance technique with a plunger device coupled to an array of EUROBALL-cluster-detectors for the first time. The differential decay curve method in coincidence mode was employed to derive lifetimes for six states in {sup 129}Ba and twelve states in {sup 130}Ba. The resulting B(E2) values are compared with triaxial rotor plus particle calculations for {sup 129}Ba and, in {sup 130}Ba, to the predictions of the general collective model, the interacting boson model, as well as to the symmetric and asymmetric rotor models. In {sup 130}Ba, the transitional quadrupole moment in the ground state band is remarkably constant before and after the backbend. With this data the two-quasiparticle negative parity band in {sup 130}Ba was confirmed to be based on a {pi}(h{sub 11/2}(multiply-in-circle sign)d{sub 5/2}/g{sub 7/2}) configuration. (c) 2000 The American Physical Society.

• OSTI ID: 20215890
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 61; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARIUM 129
BARIUM 130
COLLECTIVE MODEL
DOPPLER EFFECT
ENERGY LEVELS
EXPERIMENTAL DATA
GAMMA SPECTRA
INTERACTING BOSON MODEL
LIFETIME
QUADRUPOLE MOMENTS