Program - Brookhaven National Laboratory

However, experiments often measure level densities, in which levels are counted without including their
spin degeneracies. A spin projection method [4] enables us to also calculate level densities in SMMC. We
have calculated the level density of 162Dy and found it to agree well with neutron resonance and level
counting data, and with the level density measured by the “Oslo” method [5]. This work was supported
in part by the Department of Energy grant DE-FG-0291-ER-40608.
[1] Y. Alhassid, L. Fang and H. Nakada, Phys. Rev. Lett. 101, 082501 (2008); Journal of Physics:
Conference Series 267, 012033 (2011). [2] C. Özen, Y. Alhassid and H. Nakada, arXiv:1206.6773 (2012).
[3] A. Mukherjee and Y. Alhassid, Phys. Rev. Lett. 109, 032503 (2012). [4] Y. Alhassid, S. Liu and H.
Nakada, Phys. Rev. Lett. 99, 162504 (2007). [5] Y. Alhassid and M. Bonett-Matiz (2012).
PC 4 4:40 PM
The Theoretical Calculation of Actinide Nuclear Reaction Data
Yinlu Han, Yongli Xu, Haiying Liang, Hairui Guo, Qingbiao Shen
China Institute of Atomic Energy, P.O. Box 275(41), Beijing 102413, People’s Republic of China
Chonghai Cai
Department of Physics, Nankai University, Tianjin 300071, People’s Republic of China
Neutron-induced reactions on Actinides in the energy range below 200 MeV are of fundamental importance
in the field of nuclear energy and nuclear transmutation. For example, these interactions dominate neutron
generation and neutron transport in accelerator supported nuclear reactors, such as proposed accelerator
driven systems. Knowledge of accurate neutron-induced fission cross sections is crucially important for the
design of various reactor systems. On the other hand, since neutron, proton, deuteron, triton, and alphaparticle
emission double differential cross sections and spectra provide a complementary information on
prompt fission neutrons and nuclear reaction mechanisms, theoretical model calculation can provide more
information about nucleus structure and nuclear reaction. All cross sections of neutron-induced reactions,
angular distributions, double differential cross sections, angle-integrated spectra, prompt fission neutron
spectra, γ-ray production cross sections and energy spectra are calculated by using theoretical models for
n+ 232 Th, 233,234,235,236,237,238 U, 237 Np, 239,240,241,242 Pu, 241,242,243 Am at incident neutron energies from 0.01
to 200 MeV. The optical model, the unified Hauser-Feshbach and exciton model which included the improved
Iwamoto-Harada model, the fission model, the linear angular momentum dependent exciton density
model, the coupled channel theory, the distorted wave Born approximation and recent experimental data
are used. The present consistent theoretical calculated results are in good agreement with recent experimental
data for incident neutron energy 200 MeV. The evaluated data of neutron induced nuclear reaction
from ENDF/B-VII, JENDL-4.0 are compared with present calculated results and existing experimental
data. The calculated results are given in ENDF/B format.
PC 5 5:00 PM
Cluster Emission for the Pre-Equilibrium Exciton Model with Spin Variables
E. Betak
Institite of Physics SAS, 84511 Bratislava, Slovakia and Fac.Filos.& Sci., Sliesian Univ, 74601 Opava,
Czech Rep.
Angular momentum variables have been added into the pre-equilibrium exciton model by Obloˇzinsk´y and
Chadwick [1] to handle the equilibration process, nucleon- and γ-emissions. The emission of ligth clusters
(complex particles), i.e. deuterons to α’s, remained essentially intact by this effort. Our approach stems
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