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Improved Mo94 neutron resonance parameters from neutron capture and transmission measurements at n_TOF and GELINA

R. Mucciola1,2,*, S. Cristallo1,3, S. Kopecky4, N. Liu5, C. Massimi6,7, A. Mengoni6,8, A. Manna6,7, C. Paradela4, P. Schillebeeckx4 et al. (n_TOF Collaboration)

P. Schillebeeckx4, G. Sibbens4, D. Vescovi1,3, O. Aberle9, V. Alcayne10, S. Altieri11,12, S. Amaducci13, J. Andrzejewski14, V. Babiano-Suarez15, M. Bacak9, J. Balibrea-Correa15, C. Beltrami11, S. Bennett16, A. P. Bernardes9, E. Berthoumieux17, R. Beyer18, M. Boromiza19, D. Bosnar20, M. Caamaño21, F. Calviño22, M. Calviani9, D. Cano-Ott10, A. Casanovas22, D. M. Castelluccio6,8, F. Cerutti9, G. Cescutti23,24, S. Chasapoglou24, E. Chiaveri16,9, P. Colombetti26,27, N. Colonna28, P. Console Camprini6,8, G. Cortés22, M. A. Cortés-Giraldo29, L. Cosentino13, S. F. Dellmann30, M. Diakaki25, M. Di Castro9, M. Dietz31, S. Di Maria32, C. Domingo-Pardo15, R. Dressler33, E. Dupont17, I. Durán21, Z. Eleme34, S. Fargier9, B. Fernández29, B. Fernández-Domínguez21, P. Finocchiaro13, S. Fiore37,8, V. Furman35, F. García-Infantes36,9, A. Gawlik-Ramięga14, G. Gervino26,27, S. Gilardoni9, E. González-Romero10, S. Goula34, C. Guerrero29, F. Gunsing17, C. Gustavino38, J. Heyse4, W. Hillman16, D. G. Jenkins38, E. Jericha39, A. Junghans18, Y. Kadi9, K. Kaperoni25, G. Kaur17, A. Kimura40, I. Knapová41, M. Kokkoris25, Y. Kopatch35, M. Krtička41, N. Kyritsis25, I. Ladarescu15, S. Lanzi6,7, C. Lederer-Woods42, J. Lerendegui-Marco15, G. Lerner9, T. Martínez10, A. Masi9, P. Mastinu43, M. Mastromarco28,44, E. A. Maugeri33, A. Mazzone28,45, E. Mendoza10, V. Michalopoulou25, P. M. Milazzo23, F. Murtas46, E. Musacchio González43, A. Musumarra47,48, A. Negret19, N. Patronis34,9, J. A. Pavón29,9, M. G. Pellegriti47, P. Pérez-Maroto29, A. Pérez de Rada Fiol10, J. Perkowski14, C. Petrone19, L. Piersanti1,3, E. Pirovano31, J. Plaza del Olmo10, S. Pomp49, I. Porras36, J. Praena36, J. M. Quesada29, R. Reifarth30, D. Rochman33, Y. Romanets32, C. Rubbia9, A. Sánchez-Caballero10, M. Sabaté-Gilarte9, D. Schumann33, A. Sekhar16, A. G. Smith16, N. V. Sosnin42, M. E. Stamati34,9, A. Sturniolo26, G. Tagliente28, A. Tarifeño-Saldivia22, D. Tarrío49, P. Torres-Sánchez36, S. Urlass18,9, E. Vagena34, S. Valenta41, V. Variale28, P. Vaz32, G. Vecchio13, V. Vlachoudis9, R. Vlastou25, A. Wallner18, P. J. Woods42, T. Wright16, R. Zarrella6,7, and P. Žugec20 (n_TOF Collaboration)

  • 1Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, Italy
  • 2Dipartimento di Fisica e Geologia, Università di Perugia, Italy
  • 3Istituto Nazionale di Astrofisica - Osservatorio Astronomico d'Abruzzo, Italy
  • 4European Commission, Joint Research Centre (JRC), Geel, Belgium
  • 5Insitute for Astrophysical Research, Boston University, Boston, Massachusetts 02215, USA
  • 6Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Italy
  • 7Dipartimento di Fisica e Astronomia, Università di Bologna, Italy
  • 8Agenzia Nazionale per le Nuove Tecnologie, l'energia e lo Sviluppo Economico Sostenibile (ENEA), Italy
  • 9European Organization for Nuclear Research (CERN), Switzerland
  • 10Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT), Spain
  • 11Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Italy
  • 12Department of Physics, University of Pavia, Italy
  • 13INFN Laboratori Nazionali del Sud, Catania, Italy
  • 14University of Lodz, Poland
  • 15Instituto de Física Corpuscular, CSIC - Universidad de Valencia, Spain
  • 16University of Manchester, United Kingdom
  • 17CEA Irfu, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
  • 18Helmholtz-Zentrum Dresden-Rossendorf, Germany
  • 19Horia Hulubei National Institute of Physics and Nuclear Engineering, Romania
  • 20Department of Physics, Faculty of Science, University of Zagreb, Zagreb, Croatia
  • 21University of Santiago de Compostela, Spain
  • 22Universitat Politècnica de Catalunya, Spain
  • 23Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Italy
  • 24Department of Physics, University of Trieste, Italy
  • 25National Technical University of Athens, Greece
  • 26Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Italy
  • 27Department of Physics, University of Torino, Italy
  • 28Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Italy
  • 29Universidad de Sevilla, Spain
  • 30Goethe University Frankfurt, Germany
  • 31Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany
  • 32Instituto Superior Técnico, Lisbon, Portugal
  • 33Paul Scherrer Institut (PSI), Villigen, Switzerland
  • 34University of Ioannina, Greece
  • 35Affiliated with an institute covered by a cooperation agreement with CERN
  • 36University of Granada, Spain
  • 37Istituto Nazionale di Fisica Nucleare, Sezione di Roma1, Roma, Italy
  • 38University of York, United Kingdom
  • 39TU Wien, Atominstitut, Stadionallee 2, 1020 Wien, Austria
  • 40Japan Atomic Energy Agency (JAEA), Tokai-Mura, Japan
  • 41Charles University, Prague, Czech Republic
  • 42School of Physics and Astronomy, University of Edinburgh, United Kingdom
  • 43INFN Laboratori Nazionali di Legnaro, Italy
  • 44Dipartimento Interateneo di Fisica, Università degli Studi di Bari, Italy
  • 45Consiglio Nazionale delle Ricerche, Bari, Italy
  • 46INFN Laboratori Nazionali di Frascati, Italy
  • 47Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Italy
  • 48Department of Physics and Astronomy, University of Catania, Italy
  • 49Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden

  • *Also at INFN-Bari, Via Giovanni Amendola, 173, 70125 Bari BA, Italy.
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Phys. Rev. C 114, 034623 – Published 22 September, 2026

DOI: https://doi.org/10.1103/y9zl-61c5

Abstract

We report high-resolution measurements of the Mo94(n,γ)Mo95 cross section in the neutron energy range from a few eV up to about 250 keV, performed at the n_TOF facility (CERN), and of the Mo94(n,tot) cross section up to 32 keV, measured at GELINA (JRC Geel). A combined R-matrix analysis of capture and transmission data yields significantly improved neutron-resonance parameters for Mo94. A total of 186 resonances were observed in this analysis, of which 127 were not present in latest evaluations. The resulting Maxwellian-averaged cross section at stellar temperatures relevant to the slow neutron-capture process (s-process) is approximately 25% lower than previous evaluations and literature values. To assess the astrophysical impact of the revised cross section, we performed s-process nucleosynthesis calculations for low-mass asymptotic giant branch stars. Despite the substantial reduction in the Mo94(n,γ)Mo95 rate, the final yields vary by only 3%–4%. This demonstrates that the isotopic budget of Mo94 in asymptotic giant branch stars is primarily governed by the branching flow at Nb94 rather than by the neutron-capture destruction on Mo94 itself. The new cross section thus helps disentangle nuclear cross-section uncertainties from branching-flow effects in the s-process production of Mo94.

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Phys. Rev. C 114, 034623– Published 22 September, 2026
  • Received 12 June 2026
  • Accepted 31 August 2026
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