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- W1971993338 abstract "Ground-state radiation widths (${ensuremath{Gamma}}_{ensuremath{gamma}0}$) for 36 ${p}_{frac{3}{2}}$ photoneutron resonances in $^{91}mathrm{Zr}$ have been measured from 5-225 keV above threshold at the Argonne National Laboratory threshold photoneutron facility. Reduced neutron widths (${{ensuremath{gamma}}_{n}}^{2}$) for the same resonances were obtained at the Oak Ridge Electron Linear Accelerator facility from total-cross-section measurements on $^{90}mathrm{Zr}$. A strong correlation ($ensuremath{rho}=+0.59$) is observed between the two sets of widths. Because of a lack of knowledge of the relative phase of the compound-nucleus and valence amplitudes in the individual resonances, the average valence component cannot be deduced from the correlation analysis. However, one can obtain a mean compound-nucleus contribution by studying those resonances where the valence amplitude is expected to be negligible. By using such a procedure, an average valence component is obtained which is in excellent agreement with the average valence strength calculated from the valence model. The $s$-wave neutron strength function is ${S}^{0}=(6.2ifmmodepmelsetextpmfi{}1.2)ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}5}$ and the $p$-wave strength function is ${S}^{1}$ = (3.2 ifmmodepmelsetextpmfi{} 0.8) ifmmodetimeselsetexttimesfi{} ${10}^{ensuremath{-}4}$. The reduced photon width for $E1$ transitions is $overline{k}(E1)=(3.2ifmmodepmelsetextpmfi{}0.6)ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}3}$, in agreement with the single-particle reduced width derived from the Weisskopf model. The neutron widths are observed to follow a Porter-Thomas distribution, while the photon widths appear to follow a ${ensuremath{chi}}^{2}$ distribution with two degrees of freedom.[NUCLEAR REACTIONS $^{91}mathrm{Zr}(ensuremath{gamma},n)$, ${E}_{ensuremath{gamma}}=9.0$ MeV; deduced ${ensuremath{Gamma}}_{ensuremath{gamma}0}$ of resonances. $^{90}mathrm{Zr}$($n$, total), ${E}_{n}=5ensuremath{-}225$ keV; measured $ensuremath{sigma}(E)$, deduced ${{ensuremath{gamma}}_{n}}^{2}$ of resonances. Determined correlation, calculated valence contribution to ${ensuremath{Gamma}}_{ensuremath{gamma}0}$; calculated strength functions.]" @default.
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- W1971993338 date "1974-01-01" @default.
- W1971993338 modified "2023-09-27" @default.
- W1971993338 title "Valence component in the threshold photoneutron spectrum ofZr91" @default.
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- W1971993338 doi "https://doi.org/10.1103/physrevc.9.346" @default.
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