Thu·Oct 9, 2025Thursday·October 9, 2025

1. 01*

   Precise measurement of the $\gamma$-decay probability of the Hoyle state with a new triple coincidence-detection method

   K. Sakanashi · T. Kawabata🇯🇵 · S. Adachi · H. Akimune · S. Aogaki🇷🇴 · D.L. Balabanski🇷🇴 · S.R. Ban · R. Borcea🇷🇴 · S. Călinescu · C. Clisu🇷🇴 · R. Corbu · C. Costache🇷🇴 and 31 other authors

   We measured the $\gamma$-decay probability of the Hoyle state with a new method of triple coincidence detection of a scattered $\alpha$ particle, a recoil ${}^{12}\mathrm{C}$ nucleus, and a $\gamma$ ray in inelastic alpha scattering on ${}^{12}\mathrm{C}$. This method successfully enabled a low-background measurement and a precise determination of the $\gamma$-decay probability of the Hoyle state as ${\Gamma }_{\gamma }/\Gamma =[4.00\pm 0.22(sta.)\pm 0.18(sys.)]\times 10^{-4}$, which is consistent with the previous literature value. Therefore, we concluded that the literature value can be reliably used in the study of nucleosynthesis in the universe.

   nucl-exPLB(2025)·1 citation
2. 02*

   Measurement of the ${}^{35}Cl(n,p{)}^{35}S$ cross-section at the CERN n\_TOF facility from subthermal energy to 120 keV

   Marco Antonio Martínez-Cañadas🇪🇸 · Pablo Torres-Sánchez🇪🇸 · Javier Praena🇪🇸 · Ignacio Porras🇪🇸 · Marta Sabaté-Gilarte🇨🇭 · Oliver Aberle🇨🇭 · Victor Alcayne🇪🇸 · Simone Amaducci🇮🇹 · Józef Andrzejewski🇵🇱 · Laurent Audouin🇫🇷 · Vicente Bécares🇪🇸 · Victor Babiano-Suarez🇪🇸 and 121 other authors

   Background: The ${}^{35}Cl(n,p{)}^{35}S$ reaction is of special interest in three different applications. First, in Boron Neutron Capture Therapy due to the presence of ${}^{35}Cl$ in brain and skin tissue. Second, it is involved in the creation of ${}^{36}S$, whose astrophysical origin remains unresolved. Third, in the designing of fast nuclear reactors of new generation based on molten salts. Purpose: To measure the ${}^{35}Cl(n,p{)}^{35}S$ cross-section from thermal energy to 120 keV, determine the resonance parameters in this range and Maxwellian Averaged Cross-Section (MACS). Method: We made use of the Time-of-Flight technique with microMEGAS detectors at Experimental Area 2 (EAR-2) of n\_TOF facility at CERN. The ${}^{10}B(n,\alpha {)}^{7}Li$ and ${}^{235}U(n,f)$ reactions were used as references. Rutherford Back-scattering Spectrometry technique was performed at Centro Nacional de Aceleradores (CNA) in Sevilla, in order to accurately determine the masses of the irradiated samples. Results: We obtain a thermal cross-section of $0.470\pm 0.009$ barns. The $1/v$ energy dependence of the cross-section is observed up to the first resonance at 0.398 keV, the resonances up to 120 keV are analyzed and MACS calculated for $k_{B}T$ from 1 to 100 keV. Conclusions: The ${}^{35}Cl(n,p{)}^{35}S$ cross-section has been obtained over a wide energy range for the first time, with high accuracy across the aforementioned range. The thermal cross-section and first two resonances are in agreement with latest evaluation in ENDF/B-VIII.1, while lower resonance strength was found for high energy resonances. These data are used to calculate the MACS for different $k_{B}T$.

   nucl-exastro-ph.SRphysics.med-phEPJA(2026)·0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.