Electromagnetic properties of pseudo-Nilsson bands in 185Os

C. Wheldon; A. E. Stuchbery; A. N. Wilson; G. D. Dracoulis; A. M. Bruce; R. A. Bark; A. P. Byrne; F. M. Prados-Estevez; G. J. Lane; C.-B. Moon; J. N. Orce; R. Wood

doi:10.1140/epja/i2003-10131-2

EPJ

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2024 Impact factor 2.8

Hadrons and Nuclei

Open Access

Eur. Phys. J. A (2004) 19: 319-325
https://doi.org/10.1140/epja/i2003-10131-2

Electromagnetic properties of pseudo-Nilsson bands in ¹⁸⁵Os

C. Wheldon¹^,2^*, A. E. Stuchbery³, A. N. Wilson³, G. D. Dracoulis³, A. M. Bruce⁴, R. A. Bark³, A. P. Byrne³^,5, F. M. Prados-Estevez⁴, G. J. Lane³, C.-B. Moon³^,6, J. N. Orce⁴ and R. Wood¹

¹ Department of Physics, University of Surrey, GU2 7XH, UK
² Kernphysik II, Gesellschaft für Schwerionenforschung, Max-Planck-Straße 1, D-64291, Darmstadt, Germany
³ Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, ACT 0200, Canberra, Australia
⁴ School of Engineering, University of Brighton, BN2 4GJ, Brighton, UK
⁵ Joint appointment with Department of Physics, The Faculties , Australian National University, ACT 0200, Canberra, Australia
⁶ Department of Physics, Hoseo University, 336-795, Chung-Nam, Republic of Korea

^* e-mail: wheldon@hmi.de

Abstract

New data have been obtained for ¹⁸⁵Os following the ¹⁷⁶Yb(¹³C,4n)¹⁸⁵Os reaction, extendingthe pseudo-Nilsson $\frac{1}{2}^{-},\frac{3}{2}^{-}[\mathaccent126{4}\mathaccent126{1}\mathaccent126{1}]$ doublet structure and the $\frac{7}{2}^{-}[\mathaccent126{4}\mathaccent126{0}\mathaccent126{4}]$ band to significantly higher spins. Gamma-ray branching ratio data have been analysed to obtain extensive B(M1) and B(E2) ratios for intraband and interband transitions. The data are compared with particle-rotor calculations based on the pseudo-Nilsson potential and the Woods-Saxon potential. The results indicate that the pseudo-Nilsson approximation provides a good description of the $\frac{1}{2}^{-}$ , $\frac{3}{2}^{-}[\mathaccent126{4}\mathaccent126{1}\mathaccent126{1}]$ bands up to the first band crossing;the difference in magnitude between the model predictions and data for the $\frac{7}{2}^{-}[\mathaccent126{4}\mathaccent126{0}\mathaccent126{4}]$ band may be attributed to a lower deformation for the higher-K structure.