Thu·Nov 30, 2023Thursday·November 30, 2023

1. 01*

   First results of evaporation residue cross-section measurements of ${}^{32}$S+${}^{208}$Pb system

   R. Sariyal · I. Mazumdar🇮🇳 · D. Mehta · N. Madhavan · S. Nath · J. Gehlot · Gonika · S. M. Patel · P. B. Chavan · S. Panwar🇮🇳 · V. Ranga🇮🇳 · A. Parihari

   The dynamics of heavy ion-induced reactions play a critical role in forming super heavy elements (SHE), and one clear signature of the SHE formation is the evaporation residue (ER). In our pursuit of SHE, we present the heaviest element populated in India for ER cross-section measurements. These are the first-ever measurements of the Evaporation Residue (ER) cross-sections for the nuclear reactions between ${}^{32}$S and ${}^{208}$Pb. These measurements were conducted above the Coulomb barrier at four distinct beam energies in the laboratory frame, ranging from 176 to 191 MeV at the pelletron Linac facility at the Inter-University Accelerator Centre (IUAC), New Delhi. The Hybrid Recoil Mass Analyzer (HYRA) in a gas-filled mode was employed for these experiments. The obtained range of ER cross-sections enriches our knowledge and helps advance the field of heavy ion-induced reactions, especially in the context of super heavy element formation.

   nucl-ex0 citations
2. 02*

   Polarization Measurements of $p^{\uparrow }$ and ${}^3$He${}^{\uparrow }$ Beams at RHIC and Future EIC Using the Polarized Atomic Hydrogen Gas Jet Target

   Andrei Poblaguev🇺🇸

   At the Relativistic Heavy-Ion Collider (RHIC), the Polarized Atomic Hydrogen Gas Jet Target polarimeter (HJET) is employed for the precise measurement of the absolute transverse (vertical) polarization of proton beams, achieving low systematic uncertainties of approximately ${\sigma }_P^{\text{syst}}/P\le 0.5\%$. The acquired experimental data not only facilitated the determination of single $A_{\text{N}}(t)$ and double $A_{\text{NN}}(t)$ spin analyzing powers for 100 and 255 GeV proton beams but also revealed a non-zero Pomeron spin-flip contribution through a Regge fit. Preliminary results obtained for forward inelastic $p^{\uparrow }p$ and elastic $p^{\uparrow }A$ analyzing powers will be discussed. The success of HJET at RHIC suggests its potential application for proton beam polarimetry at the upcoming Electron-Ion Collider (EIC), aiming for an accuracy of 1\%. Moreover, the provided analysis indicates that the RHIC HJET target can serve as a tool for the precision calibration, with the required accuracy, of the ${}^3$He beam polarization at the EIC.

   nucl-exhep-exhep-phUniverse(2024)·4 citations
3. 03*

   pynucastro 2.1: an update on the development of a python library for nuclear astrophysics

   Alexander Smith Clark · Eric T. Johnson · Zhi Chen🇨🇳 · Kiran Eiden · Michael Zingale🇺🇸 · Brendan Boyd🇬🇧 · Parker T. Johnson🇺🇸 · Luis Rangel DaCosta

   pynucastro is a python library that provides visualization and analyze techniques to classify, construct, and evaluate nuclear reaction rates and networks. It provides tools that allow users to determine the importance of each rate in the network, based on a specified list of thermodynamic properties. Additionally, pynucastro can output a network in C++ or python for use in simulation codes, include the AMReX-Astrophysics simulation suite. We describe the changes in pynucastro since the last major release, including new capabilities that allow users to generate reduced networks and thermodynamic tables for conditions in nuclear statistical equilibrium.

   ↳ nucl-thastro-ph.IMastro-ph.SRnucl-exJ.Phys.Conf.Ser.(2024)·2 citations
4. 04*

   Anticipations and Discoveries of the Heavy Hydrogen Isotopes, 1913-1939

   Helge Kragh

   Just as the chemical elements from hydrogen (Z = 1) to oganesson (Z = 118) once were discovered, so were the numerous isotopes. The histories of how the isotopes were discovered are less well known, but in a few cases they are as interesting and instructive as those of the elements figuring in the periodic table. Following an overview of criteria usually associated with the concept of discovery in general, this paper examines in detail the historical developments that led to the discoveries of deuterium and tritium and also, as a by-product, the helium-3 isotope. It also includes a brief section on the neutron, which in the 1920s, when it was still a hypothetical particle, was sometimes discussed together with the mass-2 and mass-3 hydrogen isotopes. The paper concludes with a discussion of priority questions relating to suggestions of the two heavy isotopes as well as to their actual discoveries.

   ↳ physics.hist-phnucl-ex0 citations
5. 05*

   Exploring Photoproduction with the GlueX Experiment

   Matthew Shepherd🇺🇸

   The GlueX experiment at Jefferson Lab (Newport News, VA USA) is designed to explore the spectrum of mesons up to about 3 GeV. We present results on the production of light-quark resonances with linearly polarized photons. These results enhance our understanding of photoproduction mechanisms, which is valuable in subsequent searches for exotic hybrid mesons. Measurements of the J/psi photoproduction cross section at threshold are also presented.

   ↳ hep-exnucl-exEPJ Web Conf.(2024)·2 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.