Program - Brookhaven National Laboratory

The np Cross Section Determination below 1000 MeV
A.B. Laptev, Los Alamos National Laboratory. W.J. Briscoe, I.I. Strakovsky, R.L. Workman, The George
Washington University.
The absolute cross section for np scattering below 1000 MeV are determined based on partial-wave analyses
(PWAs) of nucleon-nucleon scattering data along with that for pp scattering [1]. These cross sections are
compared with most recent ENDF/B and JENDL data files, and experimental data. Systematic deviations
from the ENDF/B and JENDL evaluations in both total and angular differential cross sections are found
to exist in the low-energy region.
[1] R. A. Arndt, W. J. Briscoe, A. B. Laptev, I. I. Strakovsky and R. L. Workman, Nucl. Sci. Eng. 162,
312 (2009)
PR 107
Extensions of GENEUS Towards a Mature Evaluation Tool
H. Leeb, G. Schnabel, V. Wildpaner, Atominstitut, TU Wien, wiedner Hauptstrasse 8-10, 1040 Vienna,
Austria. D. Neudecker, T-2, Theoretical Division, Nuclear and Particle Physics, Astrophysics &
Cosmology, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
The evaluation tool GENEUS (General Nuclear Data Evaluation and Uncertainty System) is a program
package which provides evaluated cross sections and associated covariance matrices above the resonance
range. It is based on the Full Bayesian Evaluation Technique [1] which consistently combines a-priori
knowledge and experimental data. Much care is devoted to generate a proper prior resulting in a method
well suited for evaluations strongly relying on modelling. The first version was focused on evaluations of
angle-integrated cross sections and associated uncertainties of structural materials and was presented at the
ND2010 [2]. With regard to routine applications, improvements concerning the stability of the algorithms
were performed first [3]. In this contribution recent extensions of GENEUS are presented: (a) inclusion of
fissionable nuclei, (b) generation of a more complete output with additional MF-numbers and (c) transfer
of the smoothness of nuclear models to evaluated data. The progress achieved by these extensions is also
discussed. Work supported in part by EURATOM via the project ANDES and F4E within the FPA-168.
[1] H. Leeb, D. Neudecker, Th. Srdinko, Nucl. Data Sheets 109 (2008) 2762. [2] H. Leeb, St. Gundacker,
D. Neudecker, Th. Srdinko, V. Wildpaner, J. Korean Phys. Soc. 59 No. 2, (2011) 959. [3] V. Wildpaner,
D. Neudecker, Th. Srdinko, H. Leeb, EPJ Web of Conferences 27 (2012) 00003.
PR 108
Charge-exchange QRPA with the Gogny Force for Axially-Symmetric Deformed Nuclei
M. Martini, S. Goriely, Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, Belgium.
S. Péru, CEA/DAM/DIF, Arpajon, France.
In recent years fully consistent quasiparticle random-phase approximation (QRPA) calculations using finite
range Gogny force have been performed to study electromagnetic excitations of several axially-symmetric
deformed nuclei [1] up to the 238 U [2]. Here we present the generalization of this approach to the chargeexchange
nuclear excitations. In particular we focus on the Isobaric Analog and Gamow-Teller resonances.
A comparison of the results with existing experimental data, as well as predictions for some short-lived
neutron-rich nuclei are presented.
[1] M. Martini, S. Peru, M. Dupuis, Phys.Rev. C83 (2011) 034309 [2] S. Peru, G. Gosselin, M. Martini, M.
Dupuis, S. Hilaire, J.-C. Devaux, Phys.Rev. C83 (2011) 014314
317