The ${}^{239}\mathrm{Pu}{(n,2n)}^{238}\mathrm{Pu}$ cross section has been deduced using a combination of measured partial $\ensuremath{\gamma}$-ray cross sections and enhanced Hauser-Feshbach reaction modeling from threshold to ${E}_{n}l~20 \mathrm{MeV}.$ Eight ${}^{239}\mathrm{Pu}(n,2n\ensuremath{\gamma}{)}^{238}\mathrm{Pu}$ partial $\ensuremath{\gamma}$-ray cross sections were measured using the GEANIE spectrometer, the time-of-flight technique, and energetic neutrons produced at the LANSCE/WNR facility. The $(n,2n)$ cross section was obtained by multiplying the sum of observed noncoincident partial $\ensuremath{\gamma}$-ray cross sections by the calculated ratio of the $(n,2n)$ cross section divided by the sum of the same partial $\ensuremath{\gamma}$-ray cross sections. A comparison between the data and model calculations indicates potential deficiencies in the modeling of the $\ensuremath{\gamma}$-ray cascade.

Pu-239 (n, 2n) Pu-238 cross-section deduced using a combination of experiment and theory

http://www.mi.infn.it/%7Esleoni/TEMP/articoli-silvia/NPA736-Matsuo-2004-223.pdf

Violation and persistence of the K-quantum number in warm rotating nuclei

http://www.mi.infn.it/~wieland/paper_wieland/is_k_conserved_PLB615_2005.pdf

Is the K-quantum number conserved in the order-to-chaos transition region?

The intensities of primary {gamma}-ray transitions following thermal and average resonance neutron capture have been found to display a dependence on the final-state K quantum number. The apparent K-hindrance effect is significantly stronger in the thermal than in the average resonance case. After thermal neutron capture, the intensity distributions indicate that the {open_quotes}K-allowed{close_quotes} transitions are associated with a higher number of degrees of freedom than the {open_quotes}K-forbidden{close_quotes} transitions. Possible explanations for the observed phenomena are discussed. {copyright} {ital 1997} {ital The American Physical Society}

K hindrance in primary {gamma} decay after thermal and average resonance neutron capture

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K hindrance in primary {gamma} decay after thermal and average resonance neutron capture