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arXiv · 2608.18775

Improved $^{94}$Mo neutron resonance parameters from neutron capture and transmission measurements at n_TOF and GELINA

R. Mucciola·S. Cristallo·S. Kopecky·N. Liu·C. Massimi·A. Mengoni·A. Manna·C. Paradela·P. Schillebeeckx·G. Sibbens·D. Vescovi·O. Aberle·V. Alcayne·S. Altieri·S. Amaducci·J. Andrzejewski·V. Babiano-Suarez·M. Bacak·J. Balibrea-Correa·C. Beltrami·S. Bennett·A. P. Bernardes·E. Berthoumieux·R. Beyer·M. Boromiza·D. Bosnar·M. Caamano·F. Calvino·M. Calviani·D. Cano-Ott·A. Casanovas·D. M. Castelluccio·F. Cerutti·G. Cescutti·S. Chasapoglou·E. Chiaveri·P. Colombetti·N. Colonna·P. Console Camprini·G. Cortes·M. A. Cortes-Giraldo·L. Cosentino·S. F. Dellmann·M. Diakaki·M. Di Castro·M. Dietz·S. Di Maria·C. Domingo-Pardo·R. Dressler·E. Dupont·I. Duran·Z. Eleme·S. Fargier·B. Fernandez·B. Fernandez-Dominguez·P. Finocchiaro·S. Fiore·V. Furman·F. Garcia-Infantes·A. Gawlik-Ramiega·G. Gervino·S. Gilardoni·E. Gonzalez-Romero·S. Goula·C. Guerrero·F. Gunsing·C. Gustavino·J. Heyse·W. Hillman·D. G. Jenkins·E. Jericha·A. Junghans·Y. Kadi·K. Kaperoni·G. Kaur·A. Kimura·I. Knapova·M. Kokkoris·Y. Kopatch·M. Krticka·N. Kyritsis·I. Ladarescu·S. Lanzi·C. Lederer-Woods·J. Lerendegui-Marco·G. Lerner·T. Martinez·A. Masi·P. Mastinu·M. Mastromarco·E. A. Maugeri·A. Mazzone·E. Mendoza·V. Michalopoulou·P. M. Milazzo·F. Murtas·E. Musacchio Gonzalez·A. Musumarra·A. Negret·N. Patronis
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Abstract

We report high-resolution measurements of the $^{94}\mathrm{Mo}(\mathrm{n},γ)^{95}\mathrm{Mo}$ 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 $^{94}\mathrm{Mo}(\mathrm{n},\mathrm{tot})$ 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 $^{94}$Mo. A total of 186 resonances were observed in this analysis of which 127 reported here for the first time. 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 $^{94}\mathrm{Mo}(\mathrm{n},γ)^{95}\mathrm{Mo}$ rate, the final yields vary by only 3-4%. This demonstrates that the isotopic budget of $^{94}$Mo in AGB stars is primarily governed by the branching flow at $^{94}\mathrm{Nb}$ rather than by the neutron-capture destruction on $^{94}$Mo itself. The new cross section thus helps disentangle nuclear cross-section uncertainties from branching-flow effects in the s-process production of $^{94}$Mo.

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R. Mucciola, S. Cristallo, S. Kopecky, N. Liu, C. Massimi, A. Mengoni, A. Manna, C. Paradela, P. Schillebeeckx, G. Sibbens, D. Vescovi, O. Aberle, V. Alcayne, S. Altieri, S. Amaducci, J. Andrzejewski, V. Babiano-Suarez, M. Bacak, J. Balibrea-Correa, C. Beltrami, S. Bennett, A. P. Bernardes, E. Berthoumieux, R. Beyer, M. Boromiza, D. Bosnar, M. Caamano, F. Calvino, M. Calviani, D. Cano-Ott, A. Casanovas, D. M. Castelluccio, F. Cerutti, G. Cescutti, S. Chasapoglou, E. Chiaveri, P. Colombetti, N. Colonna, P. Console Camprini, G. Cortes, M. A. Cortes-Giraldo, L. Cosentino, S. F. Dellmann, M. Diakaki, M. Di Castro, M. Dietz, S. Di Maria, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Duran, Z. Eleme, S. Fargier, B. Fernandez, B. Fernandez-Dominguez, P. Finocchiaro, S. Fiore, V. Furman, F. Garcia-Infantes, A. Gawlik-Ramiega, G. Gervino, S. Gilardoni, E. Gonzalez-Romero, S. Goula, C. Guerrero, F. Gunsing, C. Gustavino, J. Heyse, W. Hillman, D. G. Jenkins, E. Jericha, A. Junghans, Y. Kadi, K. Kaperoni, G. Kaur, A. Kimura, I. Knapova, M. Kokkoris, Y. Kopatch, M. Krticka, N. Kyritsis, I. Ladarescu, S. Lanzi, C. Lederer-Woods, J. Lerendegui-Marco, G. Lerner, T. Martinez, A. Masi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, V. Michalopoulou, P. M. Milazzo, F. Murtas, E. Musacchio Gonzalez, A. Musumarra, A. Negret, N. Patronis. 2026-08-19. Improved $^{94}$Mo neutron resonance parameters from neutron capture and transmission measurements at n_TOF and GELINA. https://arxiv.org/abs/2608.18775

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