Thu·May 5, 2022Thursday·May 5, 2022

1. 01*

   Improved Limit on Tensor Currents in the Weak Interaction from ${}^8$Li $\beta$ Decay

   M. T. Burkey · G. Savard · A. T. Gallant · N. D. Scielzo · T. Y. Hirsh · L. Varriano · G. H. Sargsyan · K. D. Launey · M. Brodeur · D. P. Burdette · E. Heckmaier · K. Joerres and 19 other authors

   The electroweak interaction in the Standard Model (SM) is described by a pure vector-axial-vector structure, though any Lorentz-invariant component could contribute. In this work, we present the most precise measurement of tensor currents in the low-energy regime by examining the $\beta$-$\bar{\nu }$ correlation of trapped ${}^8$Li ions with the Beta-decay Paul Trap. We find $a_{\beta \nu }=-0.3325\pm 0.0013_{stat}\pm 0.0019_{syst}$ at $1\sigma$ for the case of coupling to right-handed neutrinos $(C_T=-C_T^{\prime })$, which is consistent with the SM prediction.

   nucl-exhep-phnucl-thPRL(2022)·37 citations
2. 02*

   QCD equation of state with Tsallis statistics for heavy-ion collisions

   K. Kyan🇯🇵 · A. Monnai🇯🇵

   Nonextensive statistics has attracted attention as a description of particle spectra in nuclear collisions at QCD energies. First, we construct the equation of state by incorporating Tsallis statistics based on the hadron resonance gas and parton gas models. Thermodynamic conditions are found to impose constraints on the $q$-parameter of Tsallis distribution. Next, we apply the equation of state to the relativistic hydrodynamic modeling of nuclear collisions. The Cooper-Frye prescription is consistently modified. Numerical demonstrations indicate that the model may describe charged particle spectra at Large Hadron Collider in the transverse momentum range up to 6-8 GeV. Elliptic flow, on the other hand, suggests a narrower range of applicability.

   ↳ nucl-thhep-phnucl-exPRD(2022)·14 citations
3. 03*

   Enhanced moments of inertia for rotation in neutron-rich nuclei

   Kenichi Yoshida🇯🇵

   Ground-state moments of inertia (MoI) are investigated for about 1700 even-even nuclei from the proton drip line to the neutron drip line up to $Z=120$ and $N=184$. The cranked Skyrme-Hartree-Fock-Bogoliubov equation is solved in the coordinate space. This model describes well the available experimental data of more than 300 nuclides possessing an appreciable deformation. I find that the MoI greatly increase near the drip line whereas the deformation is not as strong as estimated by the empirical relation. Systematic measurements of the excitation energy and the transition probability to the first $I^{\pi }=2^{+}$ state in neutron-rich nuclei not only reveal the evolution of deformation but can also constrain an effective pair interaction.

   ↳ nucl-thnucl-exPLB(2022)·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.