Mon·Oct 30, 2023Monday·October 30, 2023

1. 01*

   Reinvestigation of ${}^{91}$Sr and ${}^{95}$Y atomic masses using the JYFLTRAP Penning trap

   A. Jaries🇫🇮 · M. Stryjczyk🇫🇮 · A. Kankainen🇫🇮 · T. Eronen🇫🇮 · Z. Ge🇫🇮 · M. Mougeot🇫🇮 · A. Raggio🇫🇮 · J. Ruotsalainen🇫🇮

   We report on the precise mass measurements of the ${}^{91}$Sr and ${}^{95}$Y isotopes performed using the JYFLTRAP double Penning trap mass spectrometer. The mass-excess values from this work, $\mathrm{ME}{(}^{91}\mathrm{Sr})=-83645.5(13)$ keV and $\mathrm{ME}{(}^{95}\mathrm{Y})=-81226.4(10)$ keV, deviate by 6.5(52) keV and $-18(7)$ keV from the Atomic Mass Evaluation 2020 (AME20). In the case of ${}^{91}$Sr the new result disagrees with the ISOLTRAP value, while for ${}^{95}$Y, it agrees with the older JYFLTRAP value.

   nucl-exEPJA(2024)·2 citations
2. 02*

   Ab initio no-core shell-model study of ${}^{20-23}$Na isotopes

   Chandan Sarma🇮🇳 · Praveen C. Srivastava🇮🇳

   We have done a systematic no-core shell-model study of ${}^{20-23}$Na isotopes. The low-energy spectra of these sodium isotopes consisting of natural and un-natural parity states were reported, considering three realistic interactions: inside nonlocal outside Yukawa (INOY), charge-dependent Bonn 2000 (CDB2K), and the chiral next-to-next-to-next-to-leading order (N${}^3$LO). We also present the mirror energy differences in the low-energy spectra of $|T_z|$ = 1/2 mirror pair (${}^{21}$Na - ${}^{21}$Ne). Apart from the energy spectra, we have also reported the electromagnetic transition strengths and moments. Finally, considering all three realistic interactions, we report the point-proton radii and neutron skin thicknesses.

   ↳ nucl-thnucl-exFew Body Syst.(2025)·6 citations
3. 03*

   Photon momentum anisotropies from the late stages of relativistic heavy-ion collisions

   Hannah Elfner🇩🇪 · Niklas Götz🇩🇪 · Oscar Garcia-Montero🇩🇪 · Jean-Francois Paquet🇺🇸 · Charles Gale🇨🇦

   The photon emission from the late stages of the dynamical evolution of heavy-ion reactions at the highest RHIC and LHC energies is investigated. A comparison between a calculation from hadronic rates from a fluid dynamic evolution down to temperatures of 120 MeV and a full non-equilibrium hadronic transport approach is performed. The photon yields are very similar in both cases while the elliptic flow is slightly smaller in the non-equilibrium scenario. This study is important, since it is crucial to apply the same dynamical evolution model for hadronic and electromagnetic observables.

   ↳ nucl-thnucl-exPoS(2024)·0 citations
4. 04*

   Search for dark energy with neutron interferometry

   Hauke Fischer🇦🇹 · Christian Käding🇦🇹 · Hartmut Lemmel🇦🇹 · Stephan Sponar🇦🇹 · Mario Pitschmann🇦🇹

   We use previously obtained experimental results by neutron interferometry to effectively constrain the parameter space of several prominent dark energy models. This investigation encompasses the environment-dependent dilaton field, a compelling contender for dark energy that emerges naturally within the strong coupling limit of string theory, alongside symmetron and chameleon fields. Our study presents substantial improvements over previous constraints of the dilaton and symmetron fields, improving parameter constraints by several orders of magnitude. However, the analysis does not yield any new constraints on the chameleon field. Furthermore, we establish constraints for the projected neutron split interferometer, which has recently concluded a decisive proof-of-principle demonstration. Our symmetron simulations reveal that depending on the parameter values there are multiple static solutions with increasing number of nodes and increasing energy inside a cylindrical vacuum chamber. This agrees with results obtained earlier in the literature for infinitely parallel plates. Interestingly, while these multiple solutions can correspond to domain walls forming inside the vacuum chamber, we also find solutions that do not reach their vacuum expectation value inside the vacuum chamber, but display multiple nodes nonetheless.

   ↳ hep-phastro-ph.COgr-qcnucl-ex+1PTEP(2024)·21 citations
5. 05*

   QCD equation of state and thermodynamic observables from computationally minimal Dyson-Schwinger Equations

   Yi Lu🇨🇳 · Fei Gao🇨🇳 · Yu-Xin Liu🇨🇳 · Jan M. Pawlowski🇩🇪

   We study the QCD equation of state and other thermodynamic observables including the isentropic trajectories and the speed of sound. These observables are of eminent importance for the understanding of experimental results in heavy ion collisions and also provide a QCD input for studies of the timeline of heavy-ion-collisions with hydrodynamical simulations. They can be derived from the quark propagator whose gap equation is solved within a minimal approximation to the Dyson-Schwinger equations of QCD at finite temperature and density. This minimal approximation aims at a combination of computational efficiency and simplification of the truncation scheme while maintaining quantitative precision. This minimal DSE scheme is confronted and benchmarked with results for correlation functions and observables from first principles QCD lattice at vanishing density and quantitative functional approaches at finite density.

   ↳ hep-phnucl-exnucl-thPRD(2024)·34 citations
6. 06*

   Orbital Angular Momentum at Small $x$ Revisited

   Yuri V. Kovchegov🇺🇸 · Brandon Manley🇺🇸

   We revisit the problem of the small Bjorken-$x$ asymptotics of the quark and gluon orbital angular momentum (OAM) distributions in the proton utilizing the revised small-$x$ helicity evolution derived recently. We relate the quark and gluon OAM distributions at small $x$ to the polarized dipole amplitudes and their (first) impact-parameter moments. To obtain the OAM distributions, we derive novel small-$x$ evolution equations for the impact-parameter moments of the polarized dipole amplitudes in the double-logarithmic approximation (summing powers of ${\alpha }_s{\ln }^2(1/x)$ with ${\alpha }_s$ the strong coupling constant). We solve these evolution equations numerically and extract the leading large-$N_c$, small-$x$ asymptotics of the quark and gluon OAM distributions, which we determine to be \begin{align} L_{q+\bar{q}}(x, Q^2) \sim L_{G}(x,Q^2) \sim \Delta \Sigma(x, Q^2) \sim \Delta G(x,Q^2) \sim \left(\frac{1}{x}\right)^{3.66 \, \sqrt{\frac{\alpha_s N_c}{2\pi}}}, \notag \end{align} in agreement with the existing results in the literature within the precision of our numerical evaluation. (Here $N_c$ is the number of quark colors.) We also investigate the ratios of the quark and gluon OAM distributions to their helicity distribution counterparts in the small-$x$ region.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2024)·29 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.