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Spectroscopy and lifetime measurements of states in 76Kr populated in 76Rb decay

AuthorsGiannatiempo, A.; Perego, A.; Sona, P.; Nannini, A.; Mach, H.; Fogelberg, B.; García Borge, María José ; Tengblad, Olof ; Fraile, Luis M. ; Aas, A. J.; Gulda, K.
Keywords[PACS]γ transitions and level energies
[PACS]Internal conversion and extranuclear effects (including Auger electrons and internal bremsstrahlung)
[PACS]Lifetimes, widths
[PACS]Properties of specific nuclei listed by mass ranges: 59 ≤ A ≤ 89
Issue Date24-Oct-2005
PublisherAmerican Physical Society
CitationPhysical Review C 72(4): 044308 (2005)
AbstractThe properties of the excited states of Kr-76, populated in the decay of Rb-76 produced at ISOLDE isotopic separator, have been investigated by using K-conversion electron, gamma-ray, and gamma-gamma coincidence measurements. The lifetimes of several levels have been measured by means of the advanced time-delayed beta gamma gamma(t) method. The identification of 19 new levels and 55 transitions and the information deduced on spin and/or parity of the observed states from K-conversion coefficients, log ft values and decay properties have led to an improved knowledge of the level scheme. In particular, six 1(-) states have been definitely identified and J(pi)=2(-) has been assigned to the 2227 keV level, on which a band proposed to have negative-parity and even-spin had been previously observed. The strengths of the E0 and E2 transitions deexciting the 0(2)(+) and 0(3)(+) states (the latter is here identified with the state at 1598 keV) have been measured. The experimental data concerning the 0(2)(+) state have been analyzed in a simple two states mixing model and in the framework of the proton-neutron interacting boson model.
Description15 pages, 6 tables, 10 figures.--PACS nrs.: 23.20.Lv; 23.20.Nx; 21.10.Tg; 27.50.+e
Publisher version (URL)http://link.aps.org/doi/10.1103/PhysRevC.72.044308
Appears in Collections:(CFMAC-IEM) Artículos
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