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  • Hayes, A. B. (author)

Coulomb excitation of a Am-242 isomeric target: E2 and E3 strengths, rotational alignment, and collective enhancement

  • Article/chapterEnglish2010

Publisher, publication year, extent ...

  • 2010

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  • LIBRIS-ID:oai:lup.lub.lu.se:655e1c14-121b-4cd2-9037-bba14bd2fca2
  • https://lup.lub.lu.se/record/1752979URI
  • https://doi.org/10.1103/PhysRevC.82.044319DOI

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  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • 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)
  • Moody, K. J. (author)
  • 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)
  • Wu, C. Y. (author)
  • Becker, J. A. (author)
  • Carpenter, M. P. (author)
  • Carroll, J. J. (author)
  • Gohlke, D. (author)
  • Greene, J. P. (author)
  • Hecht, A. A. (author)
  • Janssens, R. V. F. (author)
  • Karamian, S. A. (author)
  • Lauritsen, T. (author)
  • Lister, C. J. (author)
  • Macri, R. A. (author)
  • Propri, R. (author)
  • Seweryniak, D. (author)
  • Wang, X. (author)
  • Wheeler, R. (author)
  • Zhu, S. (author)
  • Matematisk fysikFysiska institutionen (creator_code:org_t)

Related titles

  • In:Physical Review C (Nuclear Physics)82:40556-2813

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