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First experimental determination of the 40Ar( $n, 2 n$ )39Ar reaction cross section and 39Ar production in Earth’s atmosphere

https://doi.org/10.1016/j.gca.2025.12.041

Bhattacharya, S; Paul, M; Sahoo, RN; Purtschert, R; Hoffmann, HFR; Pichotta, M; Zuber, K; Bemmerer, D; Döring, T; Schwengner, R; et al (February 2026, Geochimica et Cosmochimica Acta)

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The ⁴¹ Ar(n,y) ⁴² Ar reaction

https://doi.org/10.1051/epjconf/202328401037

Sahoo, R. N.; Paul, M.; Köster, U.; Scott, R.; Tessler, M.; Zylstra, A.; Avila, M. L.; Dickerson, C.; Jayatissa, H.; Kohen, M.S.; et al (January 2023, EPJ Web of Conferences)
Mattoon, C.M.; Vogt, R.; Escher, J.; Thompson, I. (Ed.)
The cross-section of the thermal neutron capture⁴¹Ar(n,γ)⁴²Ar(t_1/2=32.9 y) reaction was measured by irradiating a⁴⁰Ar sample at the high-flux reactor of Institut Laue-Langevin (ILL) Grenoble, France. The signature of the two-neutron capture has been observed by measuring the growth curve and identifying the 1524.6 keV γ-lines of the shorter-lived⁴²K(12.4 h) β⁻daughter of⁴²Ar. Our preliminary value of the⁴¹Ar(n,γ)⁴²Ar thermal cross section is 240(80) mb at 25.3 meV. For the first time, direct counting of⁴²Ar was performed using the ultra-high sensitivity technique of noble gas accelerator mass spectrometry (NOGAMS) at Argonne National Laboratory, USA.
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⁴⁰ Ar proposed as probe of neutron-induced reactions in a high-density stellar-like plasma at the National Ignition Facility

https://doi.org/10.1051/epjconf/202327913004

Paul, M.; Sahoo, R. N.; Tessler, M.; Jeet, J.; Velsko, C.; Zylstra, A.; Avila, M.; Dickerson, C.; Fougères, C.; Jayatissa, H.; et al (January 2023, EPJ Web of Conferences)
Freeman, S.; Lederer-Woods, C.; Manna, A.; Mengoni, A. (Ed.)
The thermodynamical conditions and the neutron density produced in a laser-induced implosion of a deuterium-tritium (DT) filled capsule at the National Ignition Facility (NIF) are the closest laboratory analog of stellar conditions. We plan to investigate neutron-induced reactions on 40 Ar, namely the 40 Ar( n , 2 n ) 39 Ar( t 1/2 =268 y), the 40 Ar( n , γ) 41 Ar(110 min) and the potential rapid two-neutron capture reaction 40 Ar(2 n , γ) 42 Ar(33 y) in an Ar-loaded DT capsule. The chemical inertness of noble gas Ar enables reliable collection of the reaction products.
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Stellar ${}^{36, 38}{Ar} (n, γ) {}^{37, 39}{Ar}$ Reactions and Their Effect on Light Neutron-Rich Nuclide Synthesis

https://doi.org/10.1103/PhysRevLett.121.112701

Tessler, M.; Paul, M.; Halfon, S.; Meyer, B. S.; Pardo, R.; Purtschert, R.; Rehm, K. E.; Scott, R.; Weigand, M.; Weissman, L.; et al (September 2018, Physical Review Letters)

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