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Coulomb excitation ...
Coulomb excitation of a Am-242 isomeric target: E2 and E3 strengths, rotational alignment, and collective enhancement
- Article/chapterEnglish2010
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LIBRIS-ID:oai:lup.lub.lu.se:655e1c14-121b-4cd2-9037-bba14bd2fca2
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https://lup.lub.lu.se/record/1752979URI
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https://doi.org/10.1103/PhysRevC.82.044319DOI
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Language:English
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Summary in:English
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A 98% pure Am-242m ( K = 5(-), t(1/2) = 141 years) isomeric target was Coulomb excited with a 170.5-MeV Ar-40 beam. The selectivity of Coulomb excitation, coupled with the sensitivity of Gammasphere plus CHICO, was sufficient to identify 46 new states up to spin 18h in at least four rotational bands; 11 of these new states lie in the isomer band, 13 in a previously unknown yrast K-pi = 6(-) rotational band, and 13 in a band tentatively identified as the predicted yrast K-pi = 5(+) band. The rotational bands based on the K-pi = 5- isomer and the 6(-) bandhead were populated by Coulomb excitation with unexpectedly equal cross sections. The gamma-ray yields are reproduced by Coulomb excitation calculations using a two-particle plus rotor model (PRM), implying nearly complete Delta K = 1 mixing of the two almost-degenerate rotational bands, but recovering the Alaga rule for the unperturbed states. The degeneracy of the 5(-) and 6(-) bands allows for precise determination of the mixing interaction strength V, which approaches the strong-mixing limit; this agrees with the 50% attenuation of the Coriolis matrix element assumed in the model calculations. The fractional admixture of the I-K(pi) = 6(6)(-) state in the nominal 6(5)(-) isomer band state is measured within the PRM as 45.6(-1.1)(+0.3)%. The E2 and M1 strengths coupling the 5(-) and 6(-) bands are enhanced significantly by the mixing, while E1 and E2 couplings to other low-K bands are not measurably enhanced. The yields of the 5(+) band are reproduced by an E3 strength of approximate to 15 W.u., competitive with the interband E2 strength. Alignments of the identified two-particle Nilsson states in Am-242 are compared with the single-particle alignments in Am-241.
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Cline, D.
(author)
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Moody, K. J.
(author)
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Ragnarsson, IngemarLund University,Lunds universitet,Matematisk fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Mathematical Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)matf-ira
(author)
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Wu, C. Y.
(author)
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Becker, J. A.
(author)
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Carpenter, M. P.
(author)
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Carroll, J. J.
(author)
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Gohlke, D.
(author)
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Greene, J. P.
(author)
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Hecht, A. A.
(author)
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Janssens, R. V. F.
(author)
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Karamian, S. A.
(author)
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Lauritsen, T.
(author)
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Lister, C. J.
(author)
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Macri, R. A.
(author)
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Propri, R.
(author)
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Seweryniak, D.
(author)
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Wang, X.
(author)
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Wheeler, R.
(author)
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Zhu, S.
(author)
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Matematisk fysikFysiska institutionen
(creator_code:org_t)
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In:Physical Review C (Nuclear Physics)82:40556-2813
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Hayes, A. B.
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Cline, D.
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Moody, K. J.
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Ragnarsson, Inge ...
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Wu, C. Y.
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Becker, J. A.
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Carpenter, M. P.
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Carroll, J. J.
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Gohlke, D.
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Greene, J. P.
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Hecht, A. A.
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Janssens, R. V. ...
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Karamian, S. A.
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Lauritsen, T.
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Lister, C. J.
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Macri, R. A.
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Propri, R.
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Seweryniak, D.
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Wang, X.
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Wheeler, R.
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Zhu, S.
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