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n_TOF Collaboration(Martinez-Cañadas, M. A. et al), Torres-Sanchez, P., Babiano-Suarez, V., Caballero, L., Domingo-Pardo, C., Ladarescu, I., et al. (2026). Measurement of the 35Cl(n, p)35S cross-section at the CERN n_TOF facility from subthermal energy to 120 keV. Eur. Phys. J. A, 62(5), 90–15pp.
Abstract: The Cl-35(n, p)S-35 reaction plays a key role in neutron dosimetry for Boron Neutron Capture Therapy, in the synthesis of the isotope S-36, whose astrophysical origin remains unresolved, and in the design of next-generation molten-salt reactors. Its relevance has motivated its inclusion in the High Priority Request List (HPRL) of NEA. The goal of this work is to determine the Cl-35(n, p)S-35 cross-section from thermal energy to 120 keV for the first time ever in a single measurement, thus reducing systematic uncertainties related to the normalization to the thermal value. This had been a subject of concern in previous evaluations of this reaction. 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 B-10 (n , alpha)Li-7 and U-235(n, f) reactions were used as references. Rutherford Back-scattering Spectrometry was performed at Centro Nacional de Aceleradores (CNA) in Sevilla, in order to accurately determine the masses of the irradiated samples. We obtained a thermal cross-section of 0.470 +/- 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 resonance parameters extracted using SAMMY. Maxwellian Averaged Cross-Section (MACS) was calculated for k(B)T from 1 to 100 keV, and lower values compared to estimations from ENDF were found, e.g., 1.07 +/- 0.20 mb at k(B)T = 30 keV. The thermal cross-section and first two resonances are in agreement with the latest evaluation in ENDF/B-VIII.1, while remarkably lower resonance strengths were found for high energy resonances.
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Bruni, G., Bassani, L., Alves Garre, S., Molina, M., Malizia, A., Fiocchi, M., et al. (2026). 3C 403: a candidate neutrino-emitting radio galaxy. J. Cosmol. Astropart. Phys., 05(5), 007–20pp.
Abstract: 3C 403 is a well-known FRII radio galaxy with jets extending up to kiloparsec scales. We report its identification as the second most significant candidate among more than 150 sources examined using the 15-year neutrino dataset from the ANTARES collaboration, making it one of the most promising radio-galaxy candidates for high-energy neutrino emission. Motivated by previous associations between blazars and neutrino events, we investigated the jet properties of 3C 403 and their possible role in neutrino production. Multi-scale radio observations, from parsec to kiloparsec scales, reveal a stable, twosided jet lying close to the plane of the sky, with no evidence of strong Doppler boosting, while X-ray data indicate a dominant, heavily absorbed accretion-related component. We also examined the recently proposed correlation between neutrino and hard X-ray fluxes – originally identified in blazars and Seyfert galaxies – and find that 3C 403 occupies an intermediate location in the L nu-LhX plane between jet-dominated and corona-dominated systems. However, the current upper limit on its neutrino flux prevents a firm assessment of whether it follows the proposed relation. With radiatively efficient accretion (lambda Edd similar to 10-2), strong hard X-ray emission, and a powerful but misaligned jet, 3C 403 provides a physically motivated laboratory for exploring the interplay between coronal activity and jet environments in multimessenger scenarios of neutrino production in active galaxies.
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Celestino-Ramirez, J. M., Escrihuela, F. J., Flores, L. J., Miranda, O. G., & Sanchez-Velez, R. (2026). Searching for generalized neutrino interactions in direct detection experiments with EνES. J. High Energy Phys., 05(5), 71–14pp.
Abstract: We investigate the sensitivity of present and future direct detection experiments to generalized neutrino interactions (GNI) with electrons through elastic neutrino-electron scattering. Using data from LUX-ZEPLIN, PandaX-4T, and XENONnT, we derive constraints on vector, axial-vector, scalar, and tensor effective couplings, and compare them with existing limits. Our results show that current xenon-based detectors already provide competitive bounds, with XENONnT offering the most stringent constraints due to its larger exposure and reduced backgrounds. Among the GNI couplings, the scalar contributions remain more weakly constrained, while tensor interactions yield the strongest limits. We also present projected sensitivities for the DARWIN experiment, showing potential improvements. These results demonstrate the capability of direct detection experiments, originally designed for dark matter searches, to provide complementary and competitive constraints on generalized neutrino interactions.
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de Montigny, M., Ouimet, P. P. A., Pinfold, J., Shaa, A., & Staelens, M. (2026). Minicharged particles at accelerators: progress and prospects. Eur. Phys. J.-Spec. Top., , 17pp.
Abstract: Minicharged particles (mCPs), hypothetical free particles with effective electric charges muchsmaller than the elementary charge,e, offer a valuable probe of dark sectors and fundamental physicsthrough several clear experimental signatures. Various models of physics beyond the Standard Modelpredict such particles, the existence of which could help elucidate the ongoing mysteries regarding electriccharge quantization and the nature of dark matter. Moreover, a hypothetical scenario involving a smallminicharged subcomponent of dark matter has recently been demonstrated as a viable explanation ofthe anomaly in the 21 cm hydrogen absorption signal reported by the EDGES collaboration. Althoughseveral decades of indirect observations and direct experimental searches for mCPs at particle acceleratorshave led to severe constraints, a substantial window of the mCP mass-mixing parameter space remainsunexplored at the energy frontier accessible to current state-of-the-art accelerators, such as the LargeHadron Collider (LHC). Consequently, mCPs have remained topical over the years, and new experimentalsearches at accelerators have been gaining interest. In this article, we review the theoretical frameworks inwhich mCPs emerge and their phenomenological implications, the current direct and indirect constraintson mCPs, and the present state of the ongoing and upcoming searches for mCPs at particle accelerators.
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Zhang, S. C., Lyu, W. T., Wang, G. Y., Ma, B. Q., & Wang, E. (2026). Search for the Low-Lying Excited Baryon Σ*(1/2-) through Process Λc+ →Λ K0 π+. Chin. Phys. Lett., 43(5), 050203–8pp.
Abstract: Motivated by recent BESIII measurements of the singly Cabibbo-suppressed processes Lambda c+->Lambda K+pi 0 and Lambda c+->Lambda KS0 pi+ , we investigate the process Lambda c+->Lambda K0 pi+ by taking into account the contribution from the low-lying excited baryon Sigma*(1/2-), dynamically generated via the S-wave pseudoscalar meson-octet baryon interaction, as well as from the intermediate resonances K*(892) and N (1535). Our model successfully reproduces the BESIII pi+K0 invariant mass distribution, and predicts a distinct cusp structure around 1.43 GeV in the pi+Lambda invariant mass distribution, which is associated with the predicted Sigma*(1/2-). Future high-precise measurements of this process at BESIII, Belle II, and the proposed Super Tau-Charm Facility experiments will be crucial for testing the existence of Sigma*(1/2-) and advancing our understanding of the light baryon spectrum.
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