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- W2253207887 abstract "The height of the fission barrier and the character of the low lying single particle levels have been determined for the fission transition nucleus $^{227}mathrm{Ra}$ by fitting the energy variation of the previously reported fission cross section and fragment angular distributions in the neutron energy range $3.6<{E}_{n}<4.1$ MeV using a Hauser-Feshbach formalism. The best fit to the experimental data gave a fission barrier height ${E}_{f}=8.2ifmmodepmelsetextpmfi{}0.1$ MeV and a single particle state sequence at the barrier of $frac{3}{2}$, textonehalf{}, $frac{5}{2}$, textonehalf{}, which agrees very well with the theoretical predictions of Nix and Moller. An extension of the calculations to higher neutron energies ($4.7<{E}_{n}<9.0$) allowed deduction of $K_{0}^{}{}_{}{}^{2}$ and the transition nucleus level density as a function of excitation energy. A discontinuity in the $K_{0}^{}{}_{}{}^{2}$ values suggests a value of the pairing gap parameter ($2{ensuremath{Delta}}_{f}=2.7$ MeV) that is considerably larger than the corresponding one at the equilibrium deformation ($2{ensuremath{Delta}}_{0}=1.7$ MeV). The transition nucleus and residual nucleus level densities were compared with theoretical calculations and support the view that a collective rotational and vibrational enhancement of the intrinsic nuclear level density is necessary to account for the experimental data.NUCLEAR REACTIONS, FISSION $^{226}mathrm{Ra}(n,f)$, $E=3.6ensuremath{-}9.0$ MeV; $^{227}mathrm{Ra}^{*}$ deduced levels, $K$, $ensuremath{pi}$, $K_{0}^{}{}_{}{}^{2}$, and level density." @default.
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- W2253207887 date "1974-08-01" @default.
- W2253207887 modified "2023-10-18" @default.
- W2253207887 title "Structure of the fission transition nucleusRa227" @default.
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- W2253207887 doi "https://doi.org/10.1103/physrevc.10.697" @default.
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