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Title

Measurements of multipolarities in 227Ra as tests of evidence for stable octupole deformation

AuthorsGarcía Borge, María José ; Burke, D. G.; Gietz, H.; Hill, P.; Kaffrell, N.; Kurcewicz, W.; Løvhøiden, G.; Mattsson, S.; Naumann, R. A.; Nybø, K.; Nyman, G.; Thorsteinsen, T. F.
KeywordsRadioactivity 227Fr(β-) [from U(p, X)]
Measured I(e), γγ-, eγ-coin
227Ra deduced levels, ICC, γ-multipolarity
Uranium carbide target
On-line mass separation
Ge, Si(Li) detector
Mini-orange spectrometer
Issue Date9-Mar-1987
PublisherElsevier
CitationNuclear Physics A 464(2): 189-204 (1987)
AbstractMultipolarities of ~30 transitions in 227Ra have been established by measuring conversion electrons following the β− decay of 227Fr. For this purpose a "mini-orange"-type electron spectrometer has been constructed. The 227Fr isotopes were produced by the ISOLDE on-line separator at the CERN Synchro-cyclotron. Internal conversion coefficients were obtained from singles spectra and also from simultaneous γe− and γγ coincidence measurements. The new results support the placement of levels and transitions in the earlier level scheme but require changes in the previously assigned parities for four of the levels. Also, one E0 transition was identified. The results are consistent with previous interpretations for most of the levels that have been used to argue in favour of a small permanent octupole deformation for 227Ra.
Description16 pages, 2 tables, 5 figures.
Publisher version (URL)http://dx.doi.org/10.1016/0375-9474(87)90334-4
URIhttp://hdl.handle.net/10261/16337
DOI10.1016/0375-9474(87)90334-4
ISSN0375-9474
Appears in Collections:(CFMAC-IEM) Artículos
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