Measurement and resonance analysis of the Np-237 neutron capture cross section

Author(s)

C. Guerrero, D. Cano-Ott, E. Mendoza, U. Abbondanno, G. Aerts, F. Alvarez-Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulos, L. Audouin, G. Badurek, P. Baumann, F. Becvar, F. Belloni, E. Berthoumieux, F. Calvino, M. Calviani, R. Capote, C. Carrapico, A. Carrillo de Albornoz, P. Cennini, V. Chepel, E. Chiaveri, N. Colonna, G. Cortes, A. Couture, J. Cox, M. Dahlfors, S. David, I. Dillmann, R. Dolfini, C. Domingo-Pardo, W. Dridi, I. Duran, C. Eleftheriadis, M. Embid-Segura, L. Ferrant, A. Ferrari, R. Ferreira-Marques, L. Fitzpatrick, H. Frais-Koelbl, K. Fujii, W. Furman, I. Goncalves, E. Gonzalez-Romero, A. Goverdovski, F. Gramegna, E. Griesmayer, F. Gunsing, A. Pavlik,

Abstract

The neutron capture cross section of Np-237 was measured between 0.7 and 500 eV at the CERN n_TOF facility using the 4 pi BaF2 Total Absorption Calorimeter. The experimental capture yield was extracted minimizing all the systematic uncertainties and was analyzed together with the most reliable transmission data available using the SAMMY code. The result is a complete set of individual as well as average resonance parameters [D-0 = 0.56(2) eV, = 40.9(18) meV, 10(4)S(0) = 0.98(6), R' = 9.8(6) fm]. The capture cross section obtained in this work is in overall agreement with the evaluations and the data of Weston and Todd [Nucl. Sci. Eng. 79, 184 (1981)], thus showing sizable differences with respect to previous data from Scherbakov et al. [J. Nucl. Sci. Technol. 42, 135 (2005)] and large discrepancies with data Kobayashi et al. [J. Nucl. Sci. Technol. 39, 111 (2002)]. The results indicate that a new evaluation combining the present capture data with reliable transmission data would allow reaching an accuracy better than 4%, in line with the uncertainty requirements of the nuclear data community for the design and operation of current and future nuclear devices.

Organisation(s)

Isotope Physics

External organisation(s)

Universidad Politécnica de Madrid, University of Padova, Fachhochschule Wiener Neustadt, Centro de Investigaciones Energeticas Medioambientales y Tecnológica, European Organization for Nuclear Research (CERN), Istituto Nazionale di Fisica Nucleare (INFN), Roma, French Alternative Energies and Atomic Energy Commission (CEA), University of Lodz, University of Ioannina, Centre National De La Recherche Scientifique (CNRS), Technische Universität Wien, Centre National de la Recherche Scientifique (CNRS), Strasbourg , Charles University Prague, International Atomic Energy Agency (IAEA), Universidad de Sevilla, Universidade de Lisboa, Universidade de Coimbra, Universitat Politècnica de Catalunya, University of Notre Dame, Karlsruher Institut für Technologie, Università degli studi di Pavia, Instituto de Física Corpuscular (IFIC), Universidade de Santiago de Compostela (USC), Aristotle University of Thessaloniki, Joint Institute for Nuclear Research, Institute of Physics and Power Engineering (IPPE)

Journal

Physical Review C

Volume

85

No. of pages

15

ISSN

0556-2813

DOI

https://doi.org/10.1103/PhysRevC.85.044616

Publication date

04-2012

Peer reviewed

Yes

Austrian Fields of Science 2012

103014 Nuclear physics

Keywords

Portal url

https://ucrisportal.univie.ac.at/en/publications/bdf593ea-e2c4-4930-8409-7ee604683daf