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- W1993199295 abstract "The neutron total and neutron capture cross sections of $^{52}mathrm{Cr}$ have been measured using the neutron time-of-flight technique at a pulsed electron linear accelerator. Data analyses have been performed in the energy ranges 1 to 500 keV and 1 keV to 1 MeV, respectively, for capture and transmission, with R-matrix multilevel multichannel codes and with resonance shape fitting procedures, to determine the resonance parameters ${E}_{0}$, g${ensuremath{Gamma}}_{n}$, g${ensuremath{Gamma}}_{Y}$, J, and l. Subsequent values for the average resonance parameters for s-wave and p-wave neutron resonances are ${D}_{0}$=(43.4ifmmodepmelsetextpmfi{}4.7) keV and ${S}_{0}$=(2.85ifmmodepmelsetextpmfi{}0.25)ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}4}$ up to 1 MeV, and ${D}_{1}$=14.7 keV and ${S}_{1}$=(0.30ifmmodepmelsetextpmfi{}0.05)ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}4}$ up to 200 keV. The following nonstatistical effects are indicated in the resonance parameter set: two gaps are observed in the s-wave level distribution, where at least two resonances for each gap are missing; a strong discontinuity in the level spacing is observed for p-wave resonances whereby three energy ranges, up to 500 keV, with different level spacings may be distinguished. This energy-dependent behavior of the p-wave level density shows that the level density parameter (a) strongly depends on the excitation energy and causes parity dependence of nuclear states in the neutron energy range (200--500) keV. These deviations of the resonance parameters from statistical behavior may be explained by doorway structures with a small energy spread of states, as has been observed for $^{28}mathrm{Si}$ and $^{32}mathrm{S}$ which, like $^{52}mathrm{Cr}$, have a multiple of four nucleons in the target nucleus." @default.
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- W1993199295 date "1989-02-01" @default.
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- W1993199295 title "Nonstatistical effects observed with<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>Cr</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>52</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>+<i>n</i>resonances" @default.
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- W1993199295 doi "https://doi.org/10.1103/physrevc.39.426" @default.
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