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Titolo:
Proton-neutron structure of low lying collective quadrupole excitations inXe-126
Autore:
Gade, A; Wiedenhover, I; Gableske, J; Gelberg, A; Meise, H; Pietralla, N; von Brentano, P;
Indirizzi:
Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany Univ Cologne Cologne Germany D-50937 Kernphys, D-50937 Cologne, Germany
Titolo Testata:
NUCLEAR PHYSICS A
fascicolo: 3-4, volume: 665, anno: 2000,
pagine: 268 - 284
SICI:
0375-9474(20000228)665:3-4<268:PSOLLC>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERACTING-BOSON MODEL; MIXED-SYMMETRY STATES; NUCLEAR-STATES; NONYRAST STATES; LIMIT; O(6); DEFORMATION; REGION; BA-134; CE-142;
Keywords:
Xe-126 from Te-123(alpha,n); measured E-gamma, I-gamma, gamma gamma-coin, Xe-126 deduced levels, J, pi,delta, tau; comparison with IBM-2 calculations;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Gade, A Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany Univ Cologne Cologne Germany D-50937 s, D-50937 Cologne, Germany
Citazione:
A. Gade et al., "Proton-neutron structure of low lying collective quadrupole excitations inXe-126", NUCL PHYS A, 665(3-4), 2000, pp. 268-284

Abstract

Low spin states of the nucleus (126) Xc were studied by means of gamma-spectroscopy using the fusion evaporation reaction Te-123(alpha,n)Xe-126 performed at the Cologne FN TANDEM accelerator. The gamma gamma coincidence and singles spectra were measured with the OSIRIS-cube spectrometer. Beside theground and quasi-gamma bands many ther low lying states were observed. gamma gamma directional correlations from oriented states (DCO) were analyzed to determine the multipolarities of the gamma-transitions. We observed dominant E2-transitions in the quasi-gamma band and from the gamma- to the ground band but also a large M1-fraction in the 6(2)(+) -> 6(1)(+) transition. We additionally found a strong M1-decay depopulating the 2(4)(+)-state at 2064 keV. The lifetime of this state was measured using the Doppler shift attenuation technique. The experimental data are compared with a calculation using the proton-Neutron Interacting Boson Model (IBM-2). Good agreement isreached in the vicinity of the O(6)-limit. The observed M1-transition of the 2(4)(+) state is interpreted as due to a fragment of the lowest 2(+) mixed-symmetry state predicted by the IBM-2. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 01/12/20 alle ore 12:10:17