Wed·Jan 24, 2024Wednesday·January 24, 2024

1. 01*

   Mass measurements in the ${}^{132}$Sn region with the JYFLTRAP double Penning trap mass spectrometer

   O. Beliuskina🇫🇮 · D.A. Nesterenko🇫🇮 · A. Jaries🇫🇮 · M. Stryjczyk🇫🇮 · A. Kankainen🇫🇮 · L. Canete🇫🇮 · R.P. de Groote🇫🇮 · C. Delafosse🇫🇮 · T. Eronen🇫🇮 · Z. Ge🇫🇮 · S. Geldhof🇫🇮 · W. Gins🇫🇮 and 15 other authors

   We report on new precision mass measurements of neutron-rich ${}^{137}$Sb and ${}^{136-142}$I isotopes from the JYFLTRAP double Penning trap mass spectrometer. We confirm the value from the previous Penning-trap measurement of ${}^{137}$Sb at the Canadian Penning Trap and therefore rule out the conflicting result from the Experimental Storage Ring. The ground state and isomer in ${}^{136}$I were resolved and measured directly for the first time. The isomer excitation energy, $E_x=215.1(43)$ keV, agrees with the literature but is three times more precise. The measurements have improved the precision of the mass values and confirmed previous results in the majority of cases. However, for ${}^{138,140}$I the results differ by 17(6) keV and 23(12) keV, respectively. This could be explained by an unresolved contamination or different ratio of unresolved isomeric states in the case of ${}^{140}$I.

   nucl-exPRC(2024)·3 citations
2. 02*

   Proton-cluster femtoscopy with the HADES experiment

   Maria Stefaniak🇺🇸

   The matter created in Ag+Ag collisions at $\sqrt{s_{NN}}$ = 2.55 GeV, as measured with the HADES experiment, can be characterized by similar thermodynamic quantities as Neutron Star Mergers, thus becoming an essential reference for the understanding of these compact stellar objects. One of the methods applied to investigate heavy-ion collisions are femtoscopic correlations. They are a unique tool for the determination of the interactions between hadrons and allow to search for possible exited or unbound states of nuclear matter. We performed precise experimental studies of the correlations between protons and different clusters and compared them with the existing theoretical descriptions.

   nucl-exhep-exEPJ Web Conf.(2024)·4 citations
3. 03*

   Understanding Gravitational Form Factors with the Weizsäcker-Williams Method

   Yoshikazu Hagiwara🇨🇳 · Xuan-Bo Tong🇫🇮 · Bo-Wen Xiao🇨🇳

   Understanding the internal structure of nucleons and nuclei has been a topic of enduring interest in high-energy physics. Gravitational form factors (GFFs) provide an important portal for us to probe the energy-momentum/mass distribution of nucleons and nuclei. This letter presents the study of the photon and gluon momentum GFFs, also known as the A-GFFs, of relativistic hadrons using the Weizsäcker-Williams method. To begin, we express the photon A-GFFs in terms of charge form factors and discuss the corresponding photon radius. Furthermore, an integral relation between the gluon A-GFF and the Laplacian of dipole scattering amplitude is derived in the small-$x$ framework, and it allows us to unravel the gluon energy momentum distribution inside hadrons through measurements at the upcoming Electron-Ion Collider. In addition, we generalize the analysis to study the A-GFF of nuclei and propose employing the nuclear gluon mean square radius, together with the charge distribution, to constrain the neutron distribution for large nuclei. This work provides an interesting perspective into the fundamental structure of high-energy hadrons.

   ↳ hep-phnucl-exnucl-thPRD(2025)·17 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.