Wed·Oct 27, 2021Wednesday·October 27, 2021

1. 01*

   Intermittency analysis in relativistic heavy-ion collisions

   Zhiming Li🇨🇳 · Jin Wu🇨🇳

   Local density fluctuations near the QCD critical point can be probed by an intermittency analysis of power-law behavior on scaled factorial moments in relativistic heavy-ion collisions. We study the second-order scaled factorial moment in Au + Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 7.7-200 GeV from the UrQMD model. Since the background subtraction and efficiency correction are two important aspects in this measurement, we propose a cumulative variable method to remove background contribution and a cell-by-cell method for efficiency correction in the intermittency analysis.

   ↳ nucl-thnucl-exSciPost Phys.Proc.(2022)·0 citations
2. 02*

   Shell-model study for GT-strengths corresponding to $\beta$ decay of ${}^{60}$Ge and ${}^{62}$Ge

   Vikas Kumar · Anil Kumar🇮🇳 · Praveen C. Srivastava🇮🇳

   In the present work, we have reported a comprehensive shell-model study of GT-strengths for recently available experimental data for ${}^{60}$Ga and ${}^{62}$Ga from RIKEN Nishina Center [Phys. Rev. C 103, 014324 (2021)] populated by $\beta$ decay of the ${}^{60}$Ge and ${}^{62}$Ge, respectively. We have performed shell-model calculations in two different model spaces, the first set of calculations in the $fp$ model space using KB3G and GXPF1A interactions, while the second set in $f_{5/2}p{g}_{9/2}$ model space using JUN45 and jj44b effective interactions. Our shell-model results in $fp$ model space are in a reasonable agreement with the available experimental data.

   ↳ nucl-thnucl-exNPA(2022)·7 citations
3. 03*

   Observation of non-linearity of generalized King plot in the search for new boson

   Koki Ono🇯🇵 · Yugo Saito🇯🇵 · Taiki Ishiyama🇯🇵 · Toshiya Higomoto🇯🇵 · Tetsushi Takano🇯🇵 · Yosuke Takasu🇯🇵 · Yasuhiro Yamamoto🇵🇱 · Minoru Tanaka🇯🇵 · Yoshiro Takahashi🇯🇵

   We measure isotope shifts for neutral Yb isotopes on an ultranarrow optical clock transition ${}^1{\text{S}}_0{-}^3{\text{P}}_0$ with an accuracy of a few Hz. The part-per-billion precise measurement was possible by loading the ultracold atoms into a three-dimensional magic-wavelength optical lattice and alternately interrogating the isotope pairs, thus minimizing the effects due to the optical lattice light-shift and inter-atomic interaction as well as the drifts of a clock laser frequency and a magnetic field. The determined isotope shifts, combined with one of the recently reported isotope-shift measurements of Yb${}^{+}$ on two optical transitions, allow us to construct the King plots. Extremely large nonlinearity with the corresponding ${\chi }^2$ on the order of $10^4$ is revealed, and is not explained by a quadratic field shift. We further carry out the generalized King plot for three optical transitions so that we can eliminate the contribution arising from a higher-order effect within the Standard Model which might explain the observed nonlinearity of King plots for two transitions. Our analysis of the generalized King plot shows a deviation from linearity at the 3$\sigma$ level, indicating that there exist at least two higher order contributions in the measured isotope shifts. Then, under the reasonable assumption to attribute them to higher-order field shifts within the Standard Model, we obtain the upper bound of the product of the couplings for a new boson mediating a force between electrons, and neutrons $|y_e{y}_n|/(\hslash c)<1\times 10^{-10}$ for the mass less than 1 keV with the 95% confidence level is derived, providing an important step towards probing new physics via isotope-shift spectroscopy.

   ↳ physics.atom-phhep-exhep-phnucl-exPRX(2022)·46 citations
4. 04*

   The Impact of the New ${}^{65}$As(p,$\gamma$)${}^{66}$Se Reaction Rate on the Two-Proton Sequential Capture of ${}^{64}$Ge, Weak GeAs Cycles, and Type-I X-Ray Bursts such as the Clocked Burster GS 1826$-$24

   Yi Hua Lam🇫🇷 · Zi Xin Liu · Alexander Heger🇦🇺 · Ning Lu · Adam Michael Jacobs · Zac Johnston🇺🇸

   We re-assess ${}^{65}$As(p,$\gamma$)${}^{66}$Se reaction rates based on a set of proton thresholds of ${}^{66}$Se, $S_{\mathrm{p}}$(${}^{66}$Se), estimated from the experimental mirror nuclear masses, theoretical mirror displacement energies, and full $pf$-model space shell-model calculation. The self-consistent relativistic Hartree-Bogoliubov theory is employed to obtain the mirror displacement energies with much reduced uncertainty, and thus reducing the proton-threshold uncertainty up to 161 keV compared to the AME2020 evaluation. Using the simulation instantiated by the one-dimensional multi-zone hydrodynamic code, KEPLER, that closely reproduces the observed GS 1826$-$24 clocked bursts, the present forward and reverse ${}^{65}$As(p,$\gamma$)${}^{66}$Se reaction rates based on a selected $S_{\mathrm{p}}$(${}^{66}$Se) = 2.469$\pm$0.054 MeV, and the latest ${}^{22}$Mg($\alpha$,p)${}^{25}$Al, ${}^{56}$Ni(p,$\gamma$)${}^{57}$Cu(p,$\gamma$)${}^{58}$Zn, ${}^{55}$Ni(p,$\gamma$)${}^{56}$Cu, and ${}^{64}$Ge(p,$\gamma$)${}^{65}$As reaction rates, we find that though the GeAs cycles is weakly established in the rapid-proton capture process path, the ${}^{65}$As(p,$\gamma$)${}^{66}$Se reaction still strongly characterizes the burst tail end due to the two-proton sequential capture on ${}^{64}$Ge, not found by Cyburt et al. (2016) sensitivity study. The ${}^{65}$As(p,$\gamma$)${}^{66}$Se reaction influences the abundances of nuclei $A$ = 64, 68, 72, 76, and 80 up to a factor of 1.4. The new $S_{\mathrm{p}}$(${}^{66}$Se) and the inclusion of the updated ${}^{22}$Mg($\alpha$,p)${}^{25}$Al reaction rate increases the production of ${}^{12}$C up to a factor of $4.5$ that is not observable and could be the main fuel for superburst. The waiting point status of and two-proton sequential capture on ${}^{64}$Ge, weak-cycle feature of GeAs at region heavier than ${}^{64}$Ge, and impact of other possible $S_{\mathrm{p}}$(${}^{66}$Se) are also discussed.

   ↳ astro-ph.HEnucl-exnucl-thApJ(2022)·17 citations
5. 05*

   MiniBooNE Data Releases

   A. A. Aguilar-Arevalo🇲🇽 · B. C. Brown🇺🇸 · J. M. Conrad🇺🇸 · R. Dharmapalan🇺🇸 · A. Diaz🇺🇸 · Z. Djurcic🇺🇸 · D. A. Finley🇺🇸 · R. Ford🇺🇸 · G. T. Garvey🇺🇸 · S. Gollapinni🇺🇸 · A. Hourlier🇺🇸 · E.-C. Huang🇺🇸 and 29 other authors

   The MiniBooNE experiment has provided data releases for most publications. Occasionally it is necessary to move data release pages. This document provides a single point of reference that will be updated by the collaboration to point to the present location of the MiniBooNE data releases.

   ↳ hep-exnucl-ex9 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.