Study of ${0}^{+}$ excitations in $^{158}\mathrm{Gd}$ with the ($n,{n}^{'}\ensuremath{\gamma}$) reaction

Study of $0^{+}$ excitations in ${}^{158}{Gd}$ with the ( $n, n^{'} γ$ ) reaction

S. R. Lesher, J. N. Orce, Z. Ammar, C. D. Hannant, M. Merrick, N. Warr, T. B. Brown, N. Boukharouba, C. Fransen, M. Scheck, M. T. McEllistrem, and S. W. Yates

Phys. Rev. C 76, 034318 – Published 19 September 2007

Abstract

We have examined ${}^{158}{Gd}$ with the ( $n, n^{'} γ$ ) reaction at neutron energies up to 3.3 MeV to determine the collective character of $0^{+}$ excitations revealed in previous ${}^{160}{Gd}$ ( $p$ , $t$ ) reaction studies. Moderately large $B (E 2; 0^{+} \to 2_{1}^{+})$ values are observed for transitions from some of the $0^{+}$ states lying above the pairing gap. From its excitation energy and decay properties, the $0^{+}$ excitation at 2276.7 keV is suggested as exhibiting two-phonon $γ γ$ strength. The high density of levels at similar excitation energies makes the identification of the other two-phonon states improbable.

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Received 12 March 2007

DOI:https://doi.org/10.1103/PhysRevC.76.034318

Authors & Affiliations

S. R. Lesher^1,2, J. N. Orce¹, Z. Ammar¹, C. D. Hannant¹, M. Merrick¹, N. Warr^1,*, T. B. Brown^1,†, N. Boukharouba¹, C. Fransen^1,*, M. Scheck¹, M. T. McEllistrem¹, and S. W. Yates^1,3

¹Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055, USA
²Department of Physics, University of Richmond, Richmond, Virginia 23173, USA
³Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA

^*Present address: Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany.
^†Present address: SRTC, Westinghouse, Savannah River Co, Aiken, South Carolina 29808, USA.

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Vol. 76, Iss. 3 — September 2007

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Physical Review C

covering nuclear physics

Study of $0^{+}$ excitations in ${}^{158}{Gd}$ with the ( $n, n^{'} γ$ ) reaction

S. R. Lesher, J. N. Orce, Z. Ammar, C. D. Hannant, M. Merrick, N. Warr, T. B. Brown, N. Boukharouba, C. Fransen, M. Scheck, M. T. McEllistrem, and S. W. Yates

Phys. Rev. C 76, 034318 – Published 19 September 2007

Abstract

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Physical Review C

covering nuclear physics

Study of 0+ excitations in Gd158 with the (n,n'γ) reaction

S. R. Lesher, J. N. Orce, Z. Ammar, C. D. Hannant, M. Merrick, N. Warr, T. B. Brown, N. Boukharouba, C. Fransen, M. Scheck, M. T. McEllistrem, and S. W. Yates

Phys. Rev. C 76, 034318 – Published 19 September 2007

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Study of $0^{+}$ excitations in ${}^{158}{Gd}$ with the ( $n, n^{'} γ$ ) reaction