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Neutron Resonance Spectroscopy. VI. Mo, Sb, Te, and Pr

Physical Review1968Vol. 166(4), pp. 1234–1254

Citations Over TimeTop 10% of 1968 papers

S. Wynchank, J. B. Garg, W. W. Havens, J. Rainwater

Abstract

The total neutron cross sections of natural Mo, Te, Sb, and Pr have been measured from about 6 eV to a maximum energy of 250 keV for Mo and Pr and to about 5 keV for Sb and Te, using the Nevis synchrocyclotron and a 200-m flight path. The maximum time resolution is 0.5 nsec/m. The resonance energies and the neutron reduced widths of about 1000 levels have been obtained, using area analysis. Values of ${\ensuremath{\Gamma}}_{\ensuremath{\gamma}}\ensuremath{\sim}100$ meV were obtained for the capture widths of 15 levels in natural Sb. Values of the spin $J$ of the compound nucleus were obtained for a number of levels of Pr. Our values for the $s$-wave strength function for Mo, Sb, Te, and Pr are ${S}_{0}=(0.35\ifmmode\pm\else\textpm\fi{}0.06), (0.34\ifmmode\pm\else\textpm\fi{}0.05), (0.15\ifmmode\pm\else\textpm\fi{}0.03), \mathrm{and} (1.72\ifmmode\pm\else\textpm\fi{}0.25)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, respectively. An average level spacing $〈D〉=75.2$ eV was obtained for Pr. The presence of many $p$-wave levels led to a strong energy dependence of the observed $〈D〉$ for Mo, Sb, and Te. The observed statistical distributions of the neutron reduced widths and nearest-neighbor level spacings for Pr and natural Sb are compared with the Porter-Thomas and Wigner distributions, respectively.

Citations Over TimeTop 10% of 1968 papers

Abstract

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