Development of a Reference Database for Beta-Delayed Neutron Emission

P. Dimitriou , I. Dillmann , B. Singh , V. Piksaikin , K.P. Rykaczewski , J.L. Tain , A. Algora , K. Banerjee , I.N. Borzov , D. Cano-Ott , S. Chiba , Muriel Fallot (1) , D. Foligno (2) , R. Grzywacz , X. Huang , T. Marketin , F. Minato , G. Mukherjee , B.C. Rasco , A. Sonzogni , M. Verpelli , A. Egorov , Magali Estienne (1) , Lydie Giot (1) , D. Gremyachkin , M. Madurga , E.A. Mccutchan , E. Mendoza , K.V. Mitrofanov , M. Narbonne (1) , P. Romojaro , A. Sanchez-Caballero , N.D. Scielzo

1 SUBATECH - Laboratoire de physique subatomique et des technologies associées
2 CEA Cadarache

Beta-delayed neutron emission is important for nuclear structure and astrophysics as well as for reactor applications. Significant advances in nuclear experimental techniques in the past two decades have led to a wealth of new measurements that remain to be incorporated in the databases.We report on a coordinated effort to compile and evaluate all the available β -delayed neutron emission data. The different measurement techniques have been assessed and the data have been compared with semi-microscopic and microscopic-macroscopic models. The new microscopic database has been tested against aggregate total delayed neutron yields, time-dependent group parameters in 6-and 8-group re-presentation, and aggregate delayed neutron spectra. New recommendations of macroscopic delayed-neutron data for fissile materials of interest to applications are also presented. The new Reference Database for Beta-Delayed Neutron Emission Data is available online at: http://www-nds.iaea.org/beta-delayed-neutron/database.html .

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

P. Dimitriou, I. Dillmann, B. Singh, V. Piksaikin, K.P. Rykaczewski, et al.. Development of a Reference Database for Beta-Delayed Neutron Emission. Nucl.Data Sheets, 2021, 173, pp.144-238. ⟨10.1016/j.nds.2021.04.006⟩. ⟨hal-03143569⟩