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Closed Access item Beta-decay of the N = Z nucleus Kr-72

Authors:Piqueras, 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 Date:6-Mar-2003
Publisher:Società Italiana di Fisica
Springer
Citation:The European Physical Journal A: Hadrons and Nuclei 16(3): 313–329 (2003)
Abstract:The 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.
Description:17 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
URI:http://hdl.handle.net/10261/7248
ISSN:1434-6001 (Print)
1434-601X (Online)
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Appears in Collections:(CFMAC-IEM) Artículos

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