Neutron capture cross section measurements of $^{241}$Am at the n_TOF facility

A. Oprea , F. Gunsing (1) , P. Schillebeeckx , O. Aberle , M. Bacak (1) , E. Berthoumieux (1) , D. Cano-Ott , M. Diakaki , E. Dupont (1) , B. Geslot (2) , T. Glodariu , J. Heyse , E. Mendoza , A. Negret , V. Alcayne , S. Amaducci , J. Andrzejewski , L. Audouin (3) , V. Bécares , V. Babiano-Suarez , M. Barbagallo , F. Becčvář , G. Bellia , J. Billowes , D. Bosnar , A. Brown , M. Busso , M. Caamaño , L. Caballero-Ontanaya , F. Calviño , M. Calviani , A. Casanovas , F. Cerutti , Y.H. Chen (3) , E. Chiaveri , N. Colonna , G. Cortés , M.A. Cortés-Giraldo , L. Cosentino , S. Cristallo , L.A. Damone , M. Dietz , C. Domingo-Pardo , R. Dressler , I. Durán , Z. Eleme , B. Femández-Domínguez , A. Ferrari , P. Finocchiaro , V. Furman , K. Göbel , R. Garg , A. Gawlik , S. Gilardoni , I.F. Goncalves , E. González-Romero , C. Guerrero , H. Harada , S. Heinitz , D.G. Jenkins , E. Jericha , F. Käppeler , Y. Kadi , A. Kimura , N. Kivel , M. Kokkoris , Y. Kopatch , M. Krtička , D. Kurtulgil , I. Ladarescu , C. Lederer-Woods , J. Lerendegui-Marco , S. Lo Meo , S.J. Lonsdale , D. Macina , A. Manna , T. Martínez , A. Masi , C. Massimi , P. Mastinu , M. Mastromarco , F. Matteucci , E.A. Maugeri , A. Mazzone , A. Mengoni , V. Michalopoulou , P.M. Milazzo , F. Mingrone , A. Musumarra , R. Nolte , F. Ogállar , N. Patronis , A. Pavlik , J. Perkowski , L. Persanti , I. Porras , J. Praena , J.M. Quesada , D. Radeck , D. Ramos-Doval (3) , R. Reifarth , D. Rochman , C. Rubbia , M. Sabaté-Gilarte , A. Saxena , D. Schumann , A.G. Smith , N.V. Sosnin , A. Stamatopoulos , G. Tagliente , J.L. Tain , T. Talip , A. Tarifeño-Saldivia , L. Tassan-Got (3) , P. Torres-Sánchez , A. Tsinganis , J. Ulrich , S. Urlass , S. Valenta , G. Vannini , V. Variale , P. Vaz , A. Ventura , V. Vlachoudis , R. Vlastou , A. Wallner , P.J. Woods , T. Wright , P. Žugec

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
2 CEA Cadarache
3 IPNO - Institut de Physique Nucléaire d'Orsay

Neutron capture on $^{241}$ Am plays an important role in the nuclear energy production and also provides valuable information for the improvement of nuclear models and the statistical interpretation of the nuclear properties. A new experiment to measure the $^{241}$ Am(n,$\gamma$) cross section in the thermal region and the first few resonances below 10 eV has been carried out at EAR2 of the n_TOF facility at CERN. Three neutron-insensitive C$_{6}$D$_{6}$ detectors have been used to measure the neutron-capture gamma cascade as a function of the neutron time of flight, and then deduce the neutron capture yield. Preliminary results will be presented and compared with previously obtained results at the same facility in EAR1. In EAR1 the gamma-ray background at thermal energies was about 90% of the signal while in EAR2 is up to a 25 factor much more favorable signal to noise ratio. We also extended the low energy limit down to subthermal energies. This measurement will allow a comparison with neutron capture measurements conducted at reactors and using a different experimental technique.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

A. Oprea, F. Gunsing, P. Schillebeeckx, O. Aberle, M. Bacak, et al.. Neutron capture cross section measurements of $^{241}$Am at the n_TOF facility. 2019 International Conference on Nuclear Data for Science and Technology, May 2019, Beijing, China. pp.01009, ⟨10.1051/epjconf/202023901009⟩. ⟨hal-03224706⟩