Wed·Jun 8, 2022Wednesday·June 8, 2022

1. 01*

   Measurement of alpha-induced reaction cross-sections for ${}^{nat}$Zn with detailed covariance analysis

   Mahesh Choudhary · Aman Sharma · Namrata Singh · A. Gandhi · S. Dasgupta🇮🇹 · J. Datta · K. Katovsky · A. Kumar🇨🇦

   The production cross-section of ${}^{68}$Ge, ${}^{69}$Ge, ${}^{65}$Zn and ${}^{67}$Ga radioisotopes from alpha-induced nuclear reaction with ${}^{nat}$Zn have been measured using the stacked foil activation technique followed by the off-line $\gamma$-ray spectroscopy in the incident alpha energy range 14-37 MeV. The obtained nuclear reaction cross-sections are compared with previous experimental data available in the EXFOR data library, evaluated nuclear data from TENDL-2019 and theoretical results, calculated using TALYS nuclear reaction code. We have also performed the detailed uncertainty analysis for these nuclear reactions and their respective correlation metrics are presented. Since $\alpha$-induced reactions are important in nuclear medicine and developing the nuclear reaction codes so needful corrections related to the coincidence summing factor and the geometric factor have been considered during the data analysis in the present study.

   nucl-exNPA(2023)·6 citations
2. 02*

   Closing in on critical net-baryon fluctuations at LHC energies: cumulants up to third order in Pb$-$Pb collisions

   ALICE Collaboration

   Fluctuation measurements are important sources of information on the mechanism of particle production at LHC energies. This article reports the first experimental results on third-order cumulants of the net-proton distributions in Pb$-$Pb collisions at a center-of-mass energy $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV recorded by the ALICE detector. The results on the second-order cumulants of net-proton distributions at $\sqrt{s_{\mathrm{NN}}}=2.76$ and $5.02$ TeV are also discussed in view of effects due to the global and local baryon number conservation. The results demonstrate the presence of long-range rapidity correlations between protons and antiprotons. Such correlations originate from the early phase of the collision. The experimental results are compared with HIJING and EPOS model calculations, and the dependence of the fluctuation measurements on the phase-space coverage is examined in the context of lattice quantum chromodynamics (LQCD) and hadron resonance gas (HRG) model estimations. The measured third-order cumulants are consistent with zero within experimental uncertainties of about 4% and are described well by LQCD and HRG predictions.

   nucl-exhep-exPLB(2023)·36 citations
3. 03*

   Towards the understanding of the genuine three-body interaction for p$-$p$-$p and p$-$p$-\Lambda$

   ALICE Collaboration

   Three-body nuclear forces play an important role in the structure of nuclei and hypernuclei and are also incorporated in models to describe the dynamics of dense baryonic matter, such as in neutron stars. So far, only indirect measurements anchored to the binding energies of nuclei can be used to constrain the three-nucleon force, and if hyperons are considered, the scarce data on hypernuclei impose only weak constraints on the three-body forces. In this work, we present the first direct measurement of the p$-$p$-$p and p$-$p$-\Lambda$ systems in terms of three-particle correlation functions carried out for pp collisions at $\sqrt{s}=13$ TeV. Three-particle cumulants are extracted from the correlation functions by applying the Kubo formalism, where the three-particle interaction contribution to these correlations can be isolated after subtracting the known two-body interaction terms. A negative cumulant is found for the p$-$p$-$p system, hinting to the presence of a residual three-body effect while for p$-$p$-\Lambda$ the cumulant is consistent with zero. This measurement demonstrates the accessibility of three-baryon correlations at the LHC.

   nucl-exhep-exEPJA(2023)·51 citations
4. 04*

   Combined theoretical analysis of the parity-violating asymmetry for ${}^{48}$Ca and ${}^{208}Pb$

   Paul-Gerhard Reinhard🇩🇪 · Xavier Roca-Maza🇮🇹 · Witold Nazarewicz🇺🇸

   The recent experimental determination of the parity violating asymmetry $A_{\mathrm{pv}}$ in ${}^{48}$Ca and ${}^{208}$Pb at Jefferson Lab is important for our understanding on how neutrons and protons arrange themselves inside the atomic nucleus. To better understand the impact of these measurements, we present a rigorous theoretical investigation of $A_{\mathrm{pv}}$ in ${}^{48}$Ca and ${}^{208}$Pb and assess the associated uncertainties. We complement our study by inspecting the static electric dipole polarizability in these nuclei. The analysis is carried out within nuclear energy density functional theory with quantified input. We conclude that the simultaneous accurate description of $A_{\mathrm{pv}}$ in ${}^{48}$Ca and ${}^{208}$Pb cannot be achieved by our models that accommodate a pool of global nuclear properties, such as masses and charge radii, throughout the nuclear chart, and describe -- within one standard deviation -- the experimental dipole polarizabilities ${\alpha }_{\mathrm{D}}$ in these nuclei.

   ↳ nucl-thnucl-exPRL(2022)·121 citations
5. 05*

   Radioactive Decay

   Roland Diehl🇩🇪

   Radioactive decay of unstable atomic nuclei leads to liberation of nuclear binding energy in the forms of gamma-ray photons and secondary particles (electrons, positrons); their energy then energises surrounding matter. Unstable nuclei are formed in nuclear reactions, which can occur either in hot and dense extremes of stellar interiors or explosions, or from cosmic-ray collisions. In high-energy astronomy, direct observations of characteristic gamma-ray lines from the decay of radioactive isotopes are important tools to study the process of cosmic nucleosynthesis and its sources, as well as tracing the flows of ejecta from such sources of nucleosynthesis. These observations provide a valuable complement to indirect observations of radioactive energy deposits, such as the measurement of supernova light in the optical. Here we present basics of radioactive decay in astrophysical context, and how gamma-ray lines reveal details about stellar interiors, about explosions on stellar surfaces or of entire stars, and about the interstellar-medium processes that direct the flow and cooling of nucleosynthesis ashes once having left their sources. We address radioisotopes such as ${}^{56}$Ni, ${}^{44}$Ti, ${}^{26}$Al, ${}^{60}$Fe, ${}^{22}$Na, ${}^7$Be, and also how characteristic gamma-ray emission from the annihilation of positrons is connected to these.

   ↳ astro-ph.HEastro-ph.SRnucl-ex2 citations
6. 06*

   Nuclear $\text{C}(e,e^{\prime }p)$ Transparencies in a Relativistic Glauber Model

   Wim Cosyn🇺🇸 · Jan Ryckebusch🇧🇪

   In light of the recent Jefferson Laboratory (JLab) data for the nuclear ${}^{12}\text{C}(e,e^{\prime }p)$ transparencies, calculations, obtained in a relativistic multiple scattering Glauber approximation, are discussed. The shell-separated ${}^{12}$C transparencies are shown and it is concluded that the $p$-shell nucleons are 75\% more transparent than the $s$-shell ones. The presented comparisons between the calculations made here and the current ${}^{12}\text{C}(e,e^{\prime }p)$ data show no clear indication for the onset of color transparency when implemented within the color diffusion model with standard parameters.

   ↳ nucl-thnucl-exMDPI Physics(2022)·1 citation

* 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.