Measurement of the prompt fission -rays from slow neutron-induced fission of U with STEFF

T. Wright; A. G. Smith; N. V. Sosnin; S. A. Bennett; P. J. Davies; A. V. Popescu; J. A. Ryan; A. Sekhar; S. Warren; O. Aberle; S. Amaducci; J. Andrzejewski; L. Audouin; M. Bacak; J. Balibrea; M. Barbagallo; F. Bečvář; E. Berthoumieux; J. Billowes; D. Bosnar; A. Brown; M. Caamaño; F. Calviño; M. Calviani; D. Cano-Ott; R. Cardella; A. Casanovas; F. Cerutti; Y. H. Chen; E. Chiaveri; N. Colonna; G. Cortés; M. A. Cortés-Giraldo; L. Cosentino; L. A. Damone; M. Diakaki; C. Domingo-Pardo; R. Dressler; E. Dupont; I. Durán; B. Fernández-Domínguez; A. Ferrari; P. Ferreira; P. Finocchiaro; V. Furman; K. Göbel; A. R. García; A. Gawlik-Ramięga; S. Gilardoni; T. Glodariu; I. F. Gonçalves; E. González-Romero; E. Griesmayer; C. Guerrero; F. Gunsing; H. Harada; S. Heinitz; J. Heyse; D. G. Jenkins; E. Jericha; F. Käppeler; Y. Kadi; A. Kalamara; P. Kavrigin; A. Kimura; N. Kivel; M. Kokkoris; M. Krtička; D. Kurtulgil; E. Leal-Cidoncha; C. Lederer-Woods; H. Leeb; J. Lerendegui-Marco; S. Lo Meo; S. J. Lonsdale; D. Macina; A. Manna; J. Marganiec; T. Martínez; A. Masi; C. Massimi; P. Mastinu; M. Mastromarco; E. A. Maugeri; A. Mazzone; E. Mendoza; A. Mengoni; P. M. Milazzo; F. Mingrone; A. Musumarra; A. Negret; R. Nolte; A. Oprea; N. Patronis; A. Pavlik; J. Perkowski; I. Porras; J. Praena; J. M. Quesada; D. Radeck; T. Rauscher; R. Reifarth; C. Rubbia; M. Sabaté-Gilarte; A. Saxena; P. Schillebeeckx; D. Schumann; P. Sedyshev; A. Stamatopoulos; G. Tagliente; J. L. Tain; A. Tarifeño-Saldivia; L. Tassan-Got; S. Valenta; G. Vannini; V. Variale; P. Vaz; A. Ventura; V. Vlachoudis; R. Vlastou; A. Wallner; C. Weiss; P. J. Woods; P. Žugec

doi:10.1140/epja/s10050-024-01277-8

2024 Impact factor 2.8

Hadrons and Nuclei

Open Access

Eur. Phys. J. A (2024) 60: 70
https://doi.org/10.1140/epja/s10050-024-01277-8

Regular Article - Experimental Physics

Measurement of the prompt fission $γ$ $\gamma$ -rays from slow neutron-induced fission of $^{235}$ $^{235}$ U with STEFF

The n_TOF Collaboration (www.cern.ch/ntof), T. Wright¹^b, A. G. Smith¹, N. V. Sosnin², S. A. Bennett¹, P. J. Davies³, A. V. Popescu⁴^,5, J. A. Ryan¹, A. Sekhar¹, S. Warren¹, O. Aberle⁶, S. Amaducci⁷^,8, J. Andrzejewski⁹, L. Audouin¹⁰, M. Bacak⁶^,11^,12, J. Balibrea¹³, M. Barbagallo¹⁴, F. Bečvář¹⁵, E. Berthoumieux¹², J. Billowes¹, D. Bosnar¹⁶, A. Brown³, M. Caamaño¹⁷, F. Calviño¹⁸, M. Calviani⁶, D. Cano-Ott¹³, R. Cardella⁶, A. Casanovas¹⁸, F. Cerutti⁶, Y. H. Chen¹⁰, E. Chiaveri¹^,6^,19, N. Colonna¹⁴, G. Cortés¹⁸, M. A. Cortés-Giraldo¹⁹, L. Cosentino²⁰, L. A. Damone¹⁴^,21, M. Diakaki¹², C. Domingo-Pardo²², R. Dressler²³, E. Dupont¹², I. Durán¹⁷, B. Fernández-Domínguez¹⁷, A. Ferrari⁶, P. Ferreira²⁴, P. Finocchiaro²⁰, V. Furman⁴⁴, K. Göbel²⁵, A. R. García¹³, A. Gawlik-Ramięga⁹, S. Gilardoni⁶, T. Glodariu²⁶, I. F. Gonçalves²⁴, E. González-Romero¹³, E. Griesmayer¹¹, C. Guerrero¹⁹, F. Gunsing⁶^,12, H. Harada²⁷, S. Heinitz²³, J. Heyse²⁸, D. G. Jenkins³, E. Jericha¹¹, F. Käppeler²⁹, Y. Kadi⁶, A. Kalamara³⁰, P. Kavrigin¹¹, A. Kimura²⁷, N. Kivel²³, M. Kokkoris³⁰, M. Krtička¹⁵, D. Kurtulgil²⁵, E. Leal-Cidoncha¹⁷, C. Lederer-Woods², H. Leeb¹¹, J. Lerendegui-Marco¹⁹, S. Lo Meo⁷^,31, S. J. Lonsdale², D. Macina⁶, A. Manna⁷^,8, J. Marganiec⁹, T. Martínez¹³, A. Masi⁶, C. Massimi⁷^,8, P. Mastinu³², M. Mastromarco¹⁴, E. A. Maugeri²³, A. Mazzone¹⁴^,33, E. Mendoza¹³, A. Mengoni³¹, P. M. Milazzo³⁴, F. Mingrone⁶, A. Musumarra³⁵^,36, A. Negret²⁶, R. Nolte³⁷, A. Oprea²⁶, N. Patronis³⁸, A. Pavlik³⁹, J. Perkowski⁹, I. Porras⁴⁰, J. Praena⁴⁰, J. M. Quesada¹⁹, D. Radeck³⁷, T. Rauscher⁴¹^,42, R. Reifarth²⁵, C. Rubbia⁶, M. Sabaté-Gilarte¹^,19, A. Saxena⁴³, P. Schillebeeckx²⁸, D. Schumann²³, P. Sedyshev⁴⁴, A. Stamatopoulos³⁰, G. Tagliente¹⁴, J. L. Tain²², A. Tarifeño-Saldivia¹⁸, L. Tassan-Got¹⁰, S. Valenta¹⁵, G. Vannini⁷^,8, V. Variale¹⁴, P. Vaz²⁴, A. Ventura⁷, V. Vlachoudis⁶, R. Vlastou³⁰, A. Wallner⁴⁵, C. Weiss¹¹, P. J. Woods² and P. Žugec⁶^,16

¹ University of Manchester, Manchester, UK
² University of Edinburgh, Edinburgh, UK
³ University of York, Heslington, UK
⁴ Institut Laue-Langevin, Grenoble, France
⁵ Technische Univeristat Munchen, Munich, Germany
⁶ European Organization for Nuclear Research (CERN), Meyrin, Switzerland
⁷ Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Italy
⁸ Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy
⁹ University of Lodz, Lodz, Poland
¹⁰ Institut de Physique Nucléaire, CNRS-IN2P3, Univ. Paris-Sud, Université Paris-Saclay, 91406, Orsay Cedex, France
¹¹ TU Wien, Atominstitut, Stadionallee 2, 1020, Wien, Austria
¹² CEA Irfu, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
¹³ Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
¹⁴ Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Italy
¹⁵ Charles University, Prague, Czech Republic
¹⁶ Department of Physics, Faculty of Science, University of Zagreb, Zagreb, Croatia
¹⁷ University of Santiago de Compostela, Santiago, Spain
¹⁸ Universitat Politècnica de Catalunya, Barcelona, Spain
¹⁹ Universidad de Sevilla, Sevilla, Spain
²⁰ INFN Laboratori Nazionali del Sud, Catania, Italy
²¹ Dipartimento Interateneo di Fisica, Università degli Studi di Bari, Bari, Italy
²² Instituto de Física Corpuscular, CSIC - Universidad de Valencia, Valencia, Spain
²³ Paul Scherrer Institut (PSI), Villigen, Switzerland
²⁴ Instituto Superior Técnico, Lisbon, Portugal
²⁵ Goethe University Frankfurt, Frankfurt, Germany
²⁶ Horia Hulubei National Institute of Physics and Nuclear Engineering, Măgurele, Romania
²⁷ Japan Atomic Energy Agency (JAEA), Tokai-Mura, Japan
²⁸ European Commission, Joint Research Centre (JRC), Geel, Belgium
²⁹ Karlsruhe Institute of Technology, Campus North, IKP, 76021, Karlsruhe, Germany
³⁰ National Technical University of Athens, Athens, Greece
³¹ Agenzia Nazionale per le Nuove Tecnologie (ENEA), Roma, Italy
³² INFN Laboratori Nazionali di Legnaro, Legnaro, Italy
³³ Consiglio Nazionale delle Ricerche, Bari, Italy
³⁴ Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Italy
³⁵ Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Italy
³⁶ Department of Physics and Astronomy, University of Catania, Catania, Italy
³⁷ Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116, Braunschweig, Germany
³⁸ University of Ioannina, Ioannina, Greece
³⁹ University of Vienna, Faculty of Physics, Vienna, Austria
⁴⁰ University of Granada, Ioannina, Spain
⁴¹ Department of Physics, University of Basel, Basel, Switzerland
⁴² Centre for Astrophysics Research, University of Hertfordshire, Hertfordshire, UK
⁴³ Bhabha Atomic Research Centre (BARC), Mumbai, India
⁴⁴ Affiliated with an Institute Covered by a Cooperation Agreement with CERN, Meyrin, Switzerland
⁴⁵ Australian National University, Canberra, Australia

^b tobias.wright@manchester.ac.uk

Received: 19 September 2023
Accepted: 21 February 2024
Published online: 19 March 2024

Abstract

The average energy and multiplicity of prompt $γ$ $\gamma$ -rays from slow neutron-induced fission of $^{235}$ $^{235}$ U have been measured using the STEFF spectrometer at the neutron time-of-flight facility n_TOF. The individual responses from 11 NaI scintillators were corrected for multiple $γ$ $\gamma$ -ray interactions, prompt fission neutrons and background counts before being deconvolved to estimate the emitted spectrum of prompt fission $γ$ $\gamma$ -rays. The results give an average $γ$ $\gamma$ -ray energy ${\bar{E}}_{γ}$ ${\bar{E}}_{\gamma }$ of 1.71(5) MeV and multiplicity ${\bar{ν}}_{γ}$ $\bar{\nu }_{\gamma }$ of 2.66(18) considering $γ$ $\gamma$ -rays emitted within the energy range 0.8–6.8 MeV. The n_TOF data has a slightly larger ${\bar{E}}_{γ}$ ${\bar{E}}_{\gamma }$ and smaller ${\bar{ν}}_{γ}$ $\bar{\nu }_{\gamma }$ than other recent measurements, however the product of the two is in agreement within quoted uncertainties.

© The Author(s) 2024

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Measurement of the prompt fission γ-rays from slow neutron-induced fission of 235U with STEFF

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Measurement of the prompt fission $γ$ $\gamma$ -rays from slow neutron-induced fission of $^{235}$ $^{235}$ U with STEFF