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Experimental investigation of the 0(2)(+) band in Sm-154 as a beta-vibrational band

Abstract : A study of Sm-154 through gamma-ray and internal conversion electron coincidence measurements was performed using the Silicon And GErmanium spectrometer (SAGE). An upper limit for the rho(2)(E0; 2(2)(+) -> 2(1)(+)) and measurement of the rho(2) (E0; 4(2)(+) -> 4(1)(+)) monopole transitions strengths were determined. The extracted transition strength for each is significantly lower than that predicted by either the Bohr and Mottelson beta-vibration description or the interacting boson model. Hence, the long standing interpretation of these states as a collective band built on the 0(2)(+) state, which is conventionally assigned as a Bohr and Mottelson beta vibration is questionable. (C) 2014 The Authors. Published by Elsevier B.V.
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http://hal.in2p3.fr/in2p3-01057375
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Submitted on : Friday, August 22, 2014 - 2:24:15 PM
Last modification on : Wednesday, September 16, 2020 - 5:42:40 PM

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J. Smallcombe, P. J. Davies, C. J. Barton, D. G. Jenkins, L. L. Andersson, et al.. Experimental investigation of the 0(2)(+) band in Sm-154 as a beta-vibrational band. Physics Letters B, Elsevier, 2014, 732, pp.161-166. ⟨10.1016/j.physletb.2014.03.034⟩. ⟨in2p3-01057375⟩

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