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Beta-decay of the N = Z nucleus Kr-72

AuthorsPiqueras, Inmaculada; García Borge, María José ; Dessagne, Ph.; Giovinazzo, J.; Huck, A.; Jokinen, A.; Knipper, A.; Longour, C.; Marguier, G.; Ramdhane, M.; Rauch, V.; Tengblad, Olof ; Walter, G.; Miehé, Ch.; ISOLDE Collaboration
Keywords[PACS] Spin, parity, and isobaric spin
[PACS] γ transitions and level energies
[PACS] Relation with nuclear matrix elements and nuclear structure
[PACS] Properties of specific nuclei listed by mass ranges: 59 ≤ A ≤ 89
Issue Date6-Mar-2003
PublisherSocietà Italiana di Fisica
CitationThe European Physical Journal A: Hadrons and Nuclei 16(3): 313–329 (2003)
AbstractThe beta-decay of the N = Z, even-even nucleus Kr-72 has been studied at the ISOLDE PSB facility at CERN. Measurements of βγ and βγγ coincidences have enriched the decay scheme of the daughter nucleus Br-72 with 27 new low spin levels. A more precise half-life of T-1/2 = 17.1(2) s has been determined. Strong feeding to the Br-72 ground state is established yielding an unambiguous J(π) = 1(+) assignment for this state. Candidates for the Br-72 g.s. wave function are discussed in the framework of a self-consistent deformed mean-field calculation with SG2 Skyrme force and pairing correlations. A search for beta-delayed particle emission was made and an upper limit of 10(-6) for this decay branch obtained. The cumulated experimental level density of 1(+) states has been fitted with the constant temperature formula. The comparison indicates that most likely all 1(+) levels up to 1.2 MeV have been observed in this investigation. The corresponding nearest-neighbour level spacing does not follow a Poisson distribution. The Gamow-Teller strength distribution is compared, in terms of nuclear deformation, with different calculations made in the framework of the quasiparticle random phase approximation.
Description17 pages, 4 tables, 9 figures.-- PACS nrs.: 21.10.Hw; 23.20.Lv; 23.40.Hc; 27.50.+e.
Dedicated to Christiane Miehé on her 60th Birthday.
Publisher version (URL)http://dx.doi.org/10.1140/epja/i2002-10105-x
Appears in Collections:(CFMAC-IEM) Artículos
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