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Title

Structure of Ac-231: Measurements of level half-lives

AuthorsBoutami, Rafik ; García Borge, María José ; Mach, H.; Fraile, Luis M. ; Gulda, K.; Aas, A. J.; García Raffi, Luis M. ; Hagebø, E.; Kurcewicz, W.; Løvhøiden, G.; Martínez Pérez, Trinitario; Rubio, Berta ; Taín, José Luis ; Tengblad, Olof
KeywordsNeutron-rich nuclei
RA-231
[PACS] Lifetimes
[PACS] Gamma transitions and level energies
[PACS] Properties of specific nuclei listed by mass ranges: 220 ≤ A
[PACS] X- and gamma-ray spectroscopy
Issue DateNov-2007
PublisherEDP Sciences
Società Italiana di Fisica
Springer
SeriesEuropean Physical Journal-Special Topics 150: 87–88 (2007)
AbstractThere is lack of knowledge of the structure of the Ac-231 nucleus located in the upper border of the island of octupole deformation centered around A = 225. We have populated the excited states in Ac-231 by beta-decay from the parent Ra-231 produced at ISOLDE, CERN. The low-energy structure of Ac-231 has been investigated by means of γ, conversion electrons, γ-γ and γ-e(-) spectroscopy. We report here in the precise determination in Ac-231 of the half-life of the most intensively populated states by the Advanced Time Delayed ββγ(t) technique.
Description2 pages, 2 figures.-- PACS nrs.: 21.10.Tg; 23.20.Lv; 27.90.+b; 29.30.Kv.
Publisher version (URL)http://dx.doi.org/10.1140/epjst/e2007-00273-9
URIhttp://hdl.handle.net/10261/8860
DOI10.1140/epjst/e2007-00273-9
ISSN1951-6355
E-ISSN1951-6401
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