Physical review letters · 2026

First ^{94}Nb(n,γ) Measurement: Constraining the Nucleosynthetic Origin of ^{94}Mo in Presolar Grains.

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Balibrea-Correa J, Lerendegui-Marco J, Domingo-Pardo C, Babiano-Suarez V, Ladarescu I, Krtička M, Cescutti G, Cristallo S, Vescovi D, Liu N, Maugeri E A, Köster U, Mönch I, Casanovas A, Alcayne V, Cano-Ott D, Mendoza E, Aberle O, Andrzejewski J, Altieri S, Amaducci S, Bacak M, Beltrami C, Bennett S, Bernardes A P, Berthoumieux E, Beyer R, Boromiza M, Bosnar D, Caamaño M, Calviño F, Calviani M, Castelluccio D M, Cerutti F, Chasapoglou S, Chiaveri E, Colombetti P, Colonna N, Console Camprini P, Cortés G, Cortés-Giraldo M A, Cosentino L, Dellmann S F, Diakaki M, Di Castro M, Dietz M, Di Maria S, Dressler R, Dupont E, Durán I, Eleme Z, Fargier S, Fernández B, Fernández-Domínguez B, Finocchiaro P, Fiore S, Furman V, García-Infantes F, Gawlik-Ramięga A, Gervino G, Gilardoni S, González-Romero E, Guerrero C, Gunsing F, Gustavino C, Heyse J, Hillman W, Jenkins D G, Jericha E, Junghans A, Kadi Y, Kaperoni K, Kaur G, Kimura A, Knapová I, Kokkoris M, Kopatch Y, Kyritsis N, Lederer-Woods C, Lerner G, Manna A, Martínez T, Masi A, Massimi C, Mastinu P, Mastromarco M, Mazzone A, Mengoni A, Michalopoulou V, Milazzo P M, Mucciola R, Murtas F, Musacchio González E, Musumarra A, Negret A, Patronis N, Pavón J A, Pellegriti M G, Pérez-Maroto P, Pérez de Rada Fiol A, Perkowski J, Petrone C, Pirovano E, Plaza Del Olmo J, Pomp S, Porras I, Praena J, Quesada J M, Reifarth R, Rochman D, Romanets Y, Rubbia C, Sánchez-Caballero A, Sabaté-Gilarte M, Schillebeeckx P, Schumann D, Sekhar A, Smith A G, Sosnin N V, Stamati M E, Sturniolo A, Tagliente G, Tarifeño-Saldivia A, Tarrío D, Torres-Sánchez P, Urlass S, Vagena E, Valenta S, Variale V, Vaz P, Vecchio G, Vlachoudis V, Vlastou R, Wallner A, Woods P J, Wright T, Zarrella R, Žugec P, n_TOF Collaboration

Аннотация

Isotopic measurements of presolar silicon carbide grains from dying stars have revealed a puzzling overabundance of ^{94}Mo that stellar nucleosynthesis models have failed to reproduce for two decades. This discrepancy challenged our understanding of the slow neutron-capture process (s-process) that forges approximately half of the elements heavier than iron. The key uncertainty lies at ^{94}Nb, a radioactive branching point where competition between neutron capture and beta decay governs the ^{94}Mo production, yet the neutron-capture cross section had never been measured. Here, we report the first experimental determination of the ^{94}Nb(n,γ)^{95}Nb cross section important for Mo isotopic abundances. The measurement was enabled by a coordinated effort involving high-purity target preparation at Institute of Solid State and Materials Research Dresden, radioactive sample production at the Institut Laue-Langevin Grenoble, radiochemical characterization at Paul Scherrer Institut Villigen, and the time-of-flight CERN n_TOF facility using for the first time segmented total-energy detectors. Incorporation of the resulting Maxwellian-averaged cross section into fully coupled nucleosynthesis models of low-mass asymptotic giant-branch stars brings them into agreement with the presolar grain data. These results remove a major nuclear-physics input uncertainty at the ^{94}Nb branching point and provide a firmer foundation for understanding the origin of ^{94}Mo in the Solar System.

First ^{94}Nb(n,γ) Measurement: Constraining the Nucleosynthetic Origin of ^{94}Mo in Presolar Grains.

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Аннотация