Mon·Apr 17, 2023Monday·April 17, 2023

1. 01*

   ${}^{179}$Ta(n,$\gamma$) cross-section measurement and the astrophysical origin of ${}^{180}$Ta isotope

   R. Garg (1 and 2)🇮🇳 · S. Dellmann (3)🇩🇪 · C. Lederer-Woods (1)🇬🇧 · C. G. Bruno (1)🇬🇧 · K. Eberhardt (4) · C. Geppert (4) · T. Heftrich (3)🇩🇪 · I. Kajan (5) · F. Käppeler (6)🇩🇪 · B. Phoenix (7)🇬🇧 · R. Reifarth (3)🇩🇪 · D. Schumann (5)🇨🇭 · M. Weigand (3)🇩🇪 · C. Wheldon (7) ((1) School of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3FD, UK, (2) Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan, 48824, USA, (3) Goethe Universität Frankfurt, Frankfurt, 60438, Germany, (4) Johannes Gutenberg Universität Mainz, Mainz, 55128, Germany, (5) Paul Scherrer Institute, Villigen, 5232, Switzerland, (6) Karlsruhe Institute of Technology, Campus North, Karlsruhe, 76021, Germany, (7) School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK)🇬🇧

   Tantalum-180m is nature's rarest (quasi) stable isotope and its astrophysical origin is an open question. A possible production site of this isotope is the slow neutron capture process in Asymptotic Giant Branch stars, where it can be produced via neutron capture reactions on unstable ${}^{179}$Ta. We report a new measurement of the ${}^{179}$Ta($n,\gamma$)${}^{180}$Ta cross section at thermal neutron energies via the activation technique. Our results for the thermal and resonance-integral cross-sections are 952 $\pm$ 57 b and 2013 $\pm$ 148 b, respectively. The thermal cross section is in good agreement with the only previous measurement (Phys. Rev C {\bf 60} 025802, 1999), while the resonance integral is different by a factor of $\approx$1.7. While neutron energies in this work are smaller than the energies in a stellar environment, our results may lead to improvements in theoretical predictions of the stellar cross section.

   nucl-exPRC(2023)·0 citations
2. 02*

   Jet substructure observables for jet quenching in Quark Gluon Plasma: a Machine Learning driven analysis

   Miguel Crispim Romão🇵🇹 · José Guilherme Milhano🇵🇹 · Marco van Leeuwen🇳🇱

   We present a survey of a comprehensive set of jet substructure observables commonly used to study the modifications of jets resulting from interactions with the Quark Gluon Plasma in Heavy Ion Collisions. The \jewel{} event generator is used to produce simulated samples of quenched and unquenched jets. Three distinct analyses using Machine Learning techniques on the jet substructure observables have been performed to identify both linear and non-linear relations between the observables, and to distinguish the Quenched and Unquenched jet samples. We find that most of the observables are highly correlated, and that their information content can be captured by a small set of observables. We also find that the correlations between observables are resilient to quenching effects and that specific pairs of observables exhaust the full sensitivity to quenching effects. The code, the datasets, and instructions on how to reproduce this work are also provided.

   ↳ hep-phnucl-exnucl-thSciPost Phys.(2024)·16 citations
3. 03*

   miniBELEN: a modular neutron counter for (alpha,n) reactions

   N Mont-Geli🇪🇸 · A Tarifeño-Saldivia🇪🇸 · L M Fraile🇪🇸 · S Viñals🇪🇸 · A Perea🇪🇸 · M Pallàs🇪🇸 · G Cortés🇪🇸 · E Nácher🇪🇸 · J L Tain🇪🇸 · V Alcayne🇪🇸 · A Algora🇪🇸 · J Balibrea-Correa🇪🇸 and 29 other authors

   miniBELEN is a modular and transportable neutron moderated counter with a nearly flat neutron detection efficiency up to 10 MeV. Modularity implies that the moderator can be reassembled in different ways in order to obtain different types of response. The detector has been developed in the context of the Measurement of Alpha Neutron Yields (MANY) collaboration, which is a scientific effort aiming to carry out measurements of (alpha,n) production yields, reaction cross-sections and neutron energy spectra. In this work we present and discuss several configurations of the miniBELEN detector. The experimental validation of the efficiency calculations using 252Cf sources and the measurement of the 27Al(alpha,n)30P reaction is also presented.

   ↳ physics.ins-detnucl-exEPJ Web Conf.(2023)·0 citations
4. 04*

   Commissioning of miniBELEN-10A, a moderated neutron counter with a flat efficiency for thick-target neutron yields measurements

   N Mont-Geli🇪🇸 · A Tarifeño-Saldivia🇪🇸 · L M Fraile🇪🇸 · S Viñals🇪🇸 · A Perea🇪🇸 · M Pallàs🇪🇸 · G Cortés🇪🇸 · G Garcia · E Nácher🇪🇸 · J L Tain🇪🇸 · V Alcayne🇪🇸 · O Alonso-Sañudo and 31 other authors

   miniBELEN-10A is a modular and transportable moderated neutron counter with a nearly flat detection efficiency up to 8 MeV. The detector was designed to carry out measurements of (alpha, n) reactions in the context of the Measurement of Alpha Neutron Yields (MANY) project. In this work we present the results of the commissioning of miniBELEN-10A using the relatively well-known thick-target neutron yields from 27Al(alpha, n)30P.

   ↳ physics.ins-detnucl-exEPJ Web Conf.(2023)·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.