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

The isomeric ratios for the neutron capture reaction $^{176}$Lu($n,\gamma$) to the $J^{\pi}=5/2^-$ 761.7 keV, $T_{1/2}$ =32.8 ns and the $J^{\pi}=15/2^+$, 1356.9 keV, $T_{1/2}$=11.1 ns levels of $^{177}$Lu have been measured for the first time. The experiment was carried out with the Detector for Advanced Neutron Capture Experiments (DANCE) at the Los Alamos National Laboratory. Measured isomeric ratios are compared with talys calculations using different models for photon strength functions, level densities, and optical potentials. In order to reproduce the experimental γ-ray spectra, a low-energy resonance must be added in the photon strength function used in our Hauser-Feshbach calculations.

Isomeric ratio measurements for the radiative neutron capture $^{176}$Lu($n,\gamma$) at the LANL DANCE facility

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

Semi-empirical frameworks are widely used in calculating the bandhead energies of three-quasiparticle (3qp) configurations observed in well-deformed odd-A nuclei. In the present study, our aim is to improve the previous version of the semi-empirical model [Physical Review C. 1992, 45(6), 3013]. This is achieved by incorporating the ignored vital contributions owing to the irrotational motion of valance protons/neutrons, diagonal components of particle–particle coupling (ppc), and rotor–particle coupling (rpc) terms. We tested the validity of the improved version of the model by calculating the bandhead energies of twelve 3qp npp/pnn quadruplets observed in 163Er, 171,175,177Lu, 177Ta, and 183Re nuclides. Our new results show better agreement with the experimental data indicating the importance of newly added terms. We strongly expect that the present version of the model will provide support to future experimental campaigns for making configuration assignments to the newly observed 3qp bands and also in the identification of exact Nilsson’s configurations of 3qp quadruplets where experimental data that differentiate among the competing configuration are scarce.

/pdf/bandhead-energies-of-npp-pnn-three-quasiparticle-quadruplets-2mz7fqua.pdf

Bandhead Energies of npp/pnn Three-Quasiparticle Quadruplets

Neutron capture resonances produced in {sup 177}Lu by thermal neutrons are shown to gamma decay with intensities which are dependent on a {Delta}{ital K} selection rule. The difference between {Delta}{ital K}- forbidden (and {Delta}{ital K}-allowed) transition rates, corrected for the energy dependence, when summed over all forbidden (and allowed) transitions and divided by the number of transitions is 1.37 photons/10{sup 7} neutron captures/MeV{sup 5} for the forbidden transitions and 5.49 photons/10{sup 7} neutron captures/MeV{sup 5} for the allowed transitions which gives a ratio between forbidden and allowed transitions of 0.26. If we require that allowed and forbidden transitions only be compared within the same spin and parity group, many transitions are excluded because there are no forbidden transitions to negative parity states. The average values for the forbidden and allowed transition ensembles are then 0.59 and 1.31, respectively, giving a ratio of forbidden to allowed transition intensities of 0.45.

Delta K forbiddenness in neutron capture resonances in 177Lu.

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Delta K forbiddenness in neutron capture resonances in 177Lu.

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