Experimental investigation of the 02+ band in Sm154 as a β-vibrational band

J. Smallcombe, P.J. Davies, C.J. Barton, D.G. Jenkins, L.L. Andersson, P.A. Butler, D.M. Cox, R.-D. Herzberg, A. Mistry, E. Parr, T. Grahn, P.T. Greenlees, K. Hauschild, A. Herzan, U. Jakobsson, P. Jones, R. Julin, S. Juutinen, S. Ketelhut, M. LeinoA. Lopez-Martens, P. Nieminen, J. Pakarinen, P. Papadakis, P. Peura, P. Rahkila, S. Rinta-Antila, P. Ruotsalainen, M. Sandzelius, J. Sarén, C. Scholey, J. Sorri, J. Uusitalo

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A study of Sm154 through γ-ray and internal conversion electron coincidence measurements was performed using the Silicon And GErmanium spectrometer (SAGE). An upper limit for the ρ2(E0;22+→21+) and measurement of the ρ2(E0;42+→41+) monopole transitions strengths were determined. The extracted transition strength for each is significantly lower than that predicted by either the Bohr and Mottelson β-vibration description or the interacting boson model. Hence, the long standing interpretation of these states as a collective band built on the 02+ state, which is conventionally assigned as a Bohr and Mottelson β vibration is questionable.
Original languageEnglish
Pages (from-to)161-166
Number of pages6
JournalPhysics Letters B : Nuclear, Elementary Particle and High-Energy Physics
Early online date22 Mar 2014
Publication statusPublished - 1 May 2014

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