Nuclear structure of Ac-231
2008 (English)In: Nuclear Physics A, ISSN 0375-9474, Vol. 811, no 3-4, 244-275 p.Article in journal (Refereed) Published
The low-energy structure of Ac-231 has been investigated by means of gamma ray spectroscopy following the beta(-) decay of Ra-231. Multipolarities of 28 transitions have been established by measuring conversion electrons with a MINI-ORANGE electron spectrometer. The decay scheme of Ra-231 -> Ac-231 has been constructed for the first time. The Advanced Time Delayed beta gamma gamma(t) method has been used to measure the half-lives of five levels. The moderately fast B(EI) transition rates derived suggest that the octupole effects., albeit weak, are still present in this exotic nucleus.
Place, publisher, year, edition, pages
2008. Vol. 811, no 3-4, 244-275 p.
RADIOACTIVITY Fr-231, Ra-231(beta(-)) [from U-238(p, X), E-p=1 GeV and subsequent mass separation], measured E gamma, I gamma, E-beta, gamma gamma(-), beta gamma-coincidence, T-1/2, deduced log ft.Ac-231 deduced levels, J, pi, ICC, multipolarities, B(E1), B(M1), T-1/2. Mini-orange spectrometer. Advanced Time Delayed (ATD) beta gamma gamma (t) method
IdentifiersURN: urn:nbn:se:uu:diva-107831DOI: 10.1016/j.nuclphysa.2008.08.005ISI: 000260103400002OAI: oai:DiVA.org:uu-107831DiVA: diva2:233287