The energy level structure of 154Sm from the (n, n′γ) reaction

doi:10.1016/0375-9474(73)90439-9

Nuclear Physics A

Volume 211, Issue 3, 10 September 1973, Pages 493-508

https://doi.org/10.1016/0375-9474(73)90439-9 Get rights and content

Abstract

Gamma rays from levels in ¹⁵⁴Sm between 921 and 1817 keV excitation were observed following neutron inelastic scattering at neutron energies ranging from 1.1 to 2.3 MeV. Level positions and decay mode information were obtained. Gamma-ray production cross sections were determined and then used to deduce neutron inelastic cross sections. The results were compared with the predictions of the compound nuclear statistical theory to establish level spins and parities.

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Lifetimes of the 0₂⁺ and 2_γ⁺ states in $^{154}$ Sm were measured using the Doppler-shift Attenuation Method following Coulomb excitation. The experiment employed the gamma-ray detector array YRAST Ball at Yale University in conjunction with an array of photo-electric cells. $^{154}$ Sm was identified as one of the few deformed nuclei where the first excited 0⁺ state is the β-vibration of the ground state. The 0₃⁺ level has no collective decay to the ground state band and is interpreted as a spherical shape coexisting state based on its decay properties and calculations in the framework of the interacting boson model (IBM) and geometric collective model (GCM).
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^‡: This work was supported in part by the Atomic Energy Control Board of Canada.

^†: Present address: Department of Physics, University of Manitoba, Winnipeg 19, Manitoba, Canada.

^††: Present address: Southern Universities Nuclear Institute, PO Box 17, Faure, South Africa.

^†††: Present address: Department of Physics, Queen's University, Kingston, Ontario, Canada.

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Nuclear Physics A

Abstract

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Nuclear Data Sheets for A = 154

Nature of excited 0<sup>+</sup> states in <sup>154</sup> Sm

Nuclear data sheets for A = 154

Nuclear data sheets update for A = 154

Nuclear Data Sheets for A = 154

Bulk elemental analysis using γ rays from inelastic scattering of neutrons produced by the <sup>13</sup>C(α,n)<sup>16</sup>O reaction