Wed·Jun 21, 2023Wednesday·June 21, 2023

1. 01*

   High-precision measurements of low-lying isomeric states in ${}^{120-124}$In with JYFLTRAP double Penning trap

   D.A. Nesterenko🇫🇮 · J. Ruotsalainen🇫🇮 · M. Stryjczyk🇫🇮 · A. Kankainen🇫🇮 · L. Al Ayoubi🇫🇮 · O. Beliuskina🇫🇮 · P. Delahaye🇫🇷 · T. Eronen🇫🇮 · M. Flayol🇫🇷 · Z. Ge🇫🇮 · W. Gins🇫🇮 · M. Hukkanen🇫🇮 and 17 other authors

   Neutron-rich ${}^{120-124}$In isotopes have been studied utilizing the double Penning trap mass spectrometer JYFLTRAP at the IGISOL facility. Using the phase-imaging ion-cyclotron-resonance technique, the isomeric states were resolved from ground states and their excitation energies measured with high precision in ${}^{121,123,124}$In. In ${}^{120,122}$In, the $1^{+}$ states were separated and their masses were measured while the energy difference between the unresolved $5^{+}$ and $8^{-}$ states, whose presence was confirmed by post-trap decay spectroscopy was determined to be $\le 15$ keV. In addition, the half-life of ${}^{122}$Cd, $T_{1/2}=5.98(10)$ s, was extracted. Experimental results were compared with energy density functionals, density functional theory and shell-model calculations.

   nucl-exPRC(2023)·9 citations
2. 02*

   Two-particle Bose-Einstein correlations and their Lévy parameters in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

   CMS Collaboration

   Two-particle Bose-Einstein momentum correlation functions are studied for charged-hadron pairs in lead-lead collisions at a center-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV. The data sample, containing 4.27 $\times$ $10^9$ minimum bias events corresponding to an integrated luminosity of 0.607 nb${}^{-1}$, was collected by the CMS experiment in 2018. The experimental results are discussed in terms of a Lévy-type source distribution. The parameters of this distribution are extracted as functions of particle pair average transverse mass and collision centrality. These parameters include the Lévy index or shape parameter ($\alpha$), the Lévy scale parameter ($R$), and the correlation strength parameter ($\lambda$). The source shape, characterized by $\alpha$, is found to be neither Cauchy nor Gaussian, implying the need for a full Lévy analysis. Similarly to what was previously found for systems characterized by Gaussian source radii, a hydrodynamical scaling is observed for the Lévy $R$ parameter. The $\lambda$ parameter is studied in terms of the core-halo model.

   nucl-exhep-exPRC(2024)·27 citations
3. 03*

   Latest results of the ALICE Collaboration and plans for ALICE 3

   A. Marin (for the ALICE Collaboration)🇩🇪

   The ALICE experiment is devoted to the study of the quark-gluon plasma (QGP) created in heavy-ion collisions at the CERN LHC. The experimental setup allows for the study of many different observables that contributed to the characterization of the properties of the QGP. The ALICE experiment went through a major upgrade during LS2 to profit from the increased LHC luminosity and to improve the tracking r esolution. An additional upgrade is planned for LS3. A new experiment, ALICE 3, was proposed as next major upgrade in LS4. In this contribution, a selection of recent physics results was presented together with a glimpse of the next upgrades during LS3 and LS4, with the main focus on ALICE 3 and its physics program.

   nucl-exhep-exRev.Mex.Fis.Suppl.(2023)·0 citations
4. 04*

   Thickness Dependent Sensitivity of GAGG:Ce Scintillation detectors for Thermal Neutrons: GEANT4 Simulations and Experimental Measurements

   Annesha Karmakar · G. Anil Kumar · Mohit Tyagi · Anikesh Pal🇮🇳

   In the present work, we report extensive GEANT4 simulations in order to study the dependence of sensitivity of GAGG:Ce scintillation crystal based detector on thickness of the crystal. All the simulations are made considering a thermalised Am-Be neutron source. The simulations are validated, qualitatively and quantitatively, by comparing the simulated energy spectra and sensitivity values with those obtained from experimental measurements carried out using two different thicknesses of the crystal from our own experiment (0.5mm and 3mm) and validated with three other thicknesses (0.01mm, 0.1 mm and 1 mm) from literature. In this study, we define sensitivity of GAGG:Ce as the ratio of area under 77 keV sum peak to 45 keV peak. The present studies clearly confirm that, while it requires about 0.1 mm thickness for the GAGG:Ce crystal to fully absorb thermal neutrons, it requires about 3 mm to fully absorb the thermal neutron induced events. Further, we propose an equation, that can be used to estimate the thickness of the GAGG:Ce crystal directly from the observed sensitivity of the GAGG:Ce crystal. This equation could be very useful for the neutron imaging community for medical and space applications, as well as for manufactures of cameras meant for nuclear security purposes.

   ↳ physics.ins-detnucl-exJ.Radioanal.Nucl.Chem.(2025)·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.