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arXiv · 1511.01981

Statistical properties of $^{243}$Pu, and $^{242}$Pu(n,$γ$) cross section calculation

T. A. Laplace·F. Zeiser·M. Guttormsen·A. C. Larsen·D. L. Bleuel·L. A. Bernstein·B. L. Goldblum·S. Siem·F. L. Bello Garotte·J. A. Brown·L. Crespo Campo·T. K. Eriksen·F. Giacoppo·A. Görgen·K. Hadyńska-Klȩk·R. A. Henderson·M. Klintefjord·M. Lebois·T. Renstrøm·S. J. Rose·E. Sahin·T. G. Tornyi·G. M. Tveten·A. Voinov·M. Wiedeking·J. N. Wilson·W. Younes
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Abstract

The level density and gamma-ray strength function (gammaSF) of 243Pu have been measured in the quasi-continuum using the Oslo method. Excited states in 243Pu were populated using the 242Pu(d,p) reaction. The level density closely follows the constant-temperature level density formula for excitation energies above the pairing gap. The gammaSF displays a double-humped resonance at low energy as also seen in previous investigations of actinide isotopes. The structure is interpreted as the scissors resonance and has a centroid of omega_{SR}=2.42(5)MeV and a total strength of B_{SR}=10.1(15)mu_N^2, which is in excellent agreement with sum-rule estimates. The measured level density and gammaSF were used to calculate the 242Pu(n,gamma) cross section in a neutron energy range for which there were previously no measured data.

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T. A. Laplace, F. Zeiser, M. Guttormsen, A. C. Larsen, D. L. Bleuel, L. A. Bernstein, B. L. Goldblum, S. Siem, F. L. Bello Garotte, J. A. Brown, L. Crespo Campo, T. K. Eriksen, F. Giacoppo, A. Görgen, K. Hadyńska-Klȩk, R. A. Henderson, M. Klintefjord, M. Lebois, T. Renstrøm, S. J. Rose, E. Sahin, T. G. Tornyi, G. M. Tveten, A. Voinov, M. Wiedeking, J. N. Wilson, W. Younes. 2016-02-01. Statistical properties of $^{243}$Pu, and $^{242}$Pu(n,$γ$) cross section calculation. https://doi.org/10.1103/physrevc.93.014323

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