Thu·Oct 10, 2024Thursday·October 10, 2024

1. 01*

   Statistical properties and photon strength functions of the ${}^{112,114}$Sn isotopes below the neutron separation threshold

   P.-A. Söderström🇩🇪 · M. Markova🇳🇴 · N. Tsoneva · Y. Xu🇨🇳 · A. Kuşoğlu🇹🇷 · S. Aogaki🇷🇴 · D. L. Balabanski🇷🇴 · S. R. Ban · R. Borcea🇷🇴 · M. Brezeanu · F. Camera🇮🇹 · M. Ciemała🇵🇱 and 32 other authors

   Here, we report on the measurements of the $\gamma$-ray strength functions and nuclear level densities of ${}^{112,114}$Sn performed for the first time at the 9~MV Tandem accelerator facilities at IFIN-HH using the Oslo method. We extract thermodynamic properties and gross and fine properties of the pygmy dipole resonance for systematic comparison in the chain of Sn isotopes. The results are compared with microscopic models implemented in the TALYS reaction code and the fully microscopic quasiparticle-phonon model for the underlying nuclear structure of the dipole strength in ${}^{112,114}$Sn. The quasiparticle-phonon model results show the importance of complex configurations to the low-energy dipole response in the pygmy dipole resonance energy region. The experimental data are further included in the cross-section and reaction rate calculations for the $(\mathrm{n},\gamma )$ reaction of the $p$-process nuclei ${}^{112,114}$Sn showing a significant increase in reaction rates at high temperatures compared to existing nuclear databases.

   nucl-exPRC(2025)·4 citations
2. 02*

   First experimental study of multiple orientation muon tomography, with image optimization in sparse data environments

   Jesus J. Valencia (1)🇪🇸 · Adam A. Hecht (1) · C. L. Morris (2)🇺🇸 · E. Guardincerri (2)🇺🇸 · D. Poulson (2)🇺🇸 · J. Bacon (2)🇬🇧 · J. M. Durham (2) ((1) Department of Nuclear Engineering, University of New Mexico, Albuquerque, NM, USA, (2) Los Alamos National Laboratory, Los Alamos, NM, USA)🇺🇸

   Due to the high penetrating power of cosmic ray muons, they can be used to probe very thick and dense objects. As charged particles, they can be tracked by ionization detectors, determining the position and direction of the muons. With detectors on either side of an object, particle direction changes can be used to extract scattering information within an object. This can be used to produce a scattering intensity image within the object related to density and atomic number. Such imaging is typically performed with a single detector-object orientation, taking advantage of the more intense downward flux of muons, producing planar imaging with some depth-of-field information in the third dimension. Several simulation studies have been published with multi-orientation tomography, which can form a three-dimensional representation faster than a single orientation view. In this work we present the first experimental multiple orientation muon tomography study. Experimental muon-scatter based tomography was performed using a concrete filled steel drum with several different metal wedges inside, between detector planes. Data was collected from different detector-object orientations by rotating the steel drum. The data collected from each orientation were then combined using two different tomographic methods. Results showed that using a combination of multiple depth-of-field reconstructions, rather than a traditional inverse Radon transform approach used for CT, resulted in more useful images for sparser data. As cosmic ray muon flux imaging is rate limited, the imaging techniques were compared for sparse data. Using the combined depth-of-field reconstruction technique, fewer detector-object orientations were needed to reconstruct images that could be used to differentiate the metal wedge compositions.

   ↳ eess.IVnucl-exphysics.app-phPhys.Rev.Applied(2025)·1 citation
3. 03*

   Re-investigation of neutron capture by 84Kr and 86Kr in the s-process nucleosynthesis

   Abdul Kabir · Zain Ul Abideen · Jameel-Un Nabi🇵🇰

   The thermonuclear reaction rates and Maxwellian averaged cross sections (MACS) for the 84Kr(n,{\gamma}) 85Kr and 86Kr(n,{\gamma}) 87Kr processes were examined using the statistical model code Talys v1.96. The effects of nuclear level densities (NLDs) on Maxwellian averaged cross sections and neutron capture rates are examined both quantitatively and qualitatively. The present Talys based MACS and radiative capture rates for 84Kr(n,{\gamma}) 85Kr and 86Kr(n,{\gamma}) 87Kr processes agree well with the earlier reported findings. The statistical models nuclear properties (level density and gamma ray strength) were fine tuned to reproduce the existing experimental nuclear data.

   ↳ nucl-thastro-ph.SRnucl-exBraz.J.Phys.(2024)·4 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.