Fri·Oct 29, 2021Friday·October 29, 2021

1. 01*

   Signatures of muonic activation in the Majorana Demonstrator

   I.J. Arnquist🇺🇸 · F.T. Avignone III🇺🇸 · A.S. Barabash🇷🇺 · C.J. Barton🇺🇸 · F.E. Bertrand🇺🇸 · E. Blalock🇺🇸 · B. Bos🇺🇸 · M. Busch🇺🇸 · M. Buuck🇺🇸 · T.S. Caldwell🇺🇸 · Y-D. Chan🇺🇸 · C.D. Christofferson🇺🇸 and 46 other authors

   Experiments searching for very rare processes such as neutrinoless double-beta decay require a detailed understanding of all sources of background. Signals from radioactive impurities present in construction and detector materials can be suppressed using a number of well-understood techniques. Background from in-situ cosmogenic interactions can be reduced by siting an experiment deep underground. However, the next generation of such experiments have unprecedented sensitivity goals of 10${}^{28}$ years half-life with background rates of 10${}^{-5}$cts/(keV kg yr) in the region of interest. To achieve these goals, the remaining cosmogenic background must be well understood. In the work presented here, Majorana Demonstrator data is used to search for decay signatures of meta-stable germanium isotopes. Contributions to the region of interest in energy and time are estimated using simulations, and compared to Demonstrator data. Correlated time-delayed signals are used to identify decay signatures of isotopes produced in the germanium detectors. A good agreement between expected and measured rate is found and different simulation frameworks are used to estimate the uncertainties of the predictions. The simulation campaign is then extended to characterize the background for the LEGEND experiment, a proposed tonne-scale effort searching for neutrinoless double-beta decay in ${}^{76}$Ge.

   nucl-exphysics.ins-detPRC(2022)·9 citations
2. 02*

   Momentum-Current Gravitational Multipoles of Hadrons

   Xiangdong Ji🇺🇸 · Yizhuang Liu🇵🇱

   We study multipole expansion of the momentum currents in hadrons, with three series $S^{(J)}$, ${\tilde{T}}^{(J)}$, and $T^{(J)}$, in connection with the gravitational fields generated nearby. The momentum currents are related to their energy-momentum form factors, which in principle can be probed through processes like deeply-virtual Compton scattering currently studied at JLab 12 GeV facility and future Electron Ion Collider. We define the leading momentum-current multipoles, tensor monopole $\tau$ ($T0$) and scalar quadrupole ${\hat{\sigma }}^{ij}$ ($S2$) moments, relating the former to the so-called $D$-term in the literature. We calculate the momentum current distribution in hydrogen atom and its monopole moment in the basic unit of ${\tau }_0={\hslash }^2/4M$, showing that the sign of $D$-term has little to do with mechanical stability. The momentum current distribution also strongly modifies the static gravitational field inside hadrons.

   ↳ hep-phhep-latnucl-exnucl-thPRD(2022)·49 citations
3. 03*

   Flow decorrelation in heavy-ion collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}$=27 and 200 GeV with 3D event-by-event viscous hydrodynamics

   Jakub Cimerman🇨🇿 · Iurii Karpenko🇨🇿 · Boris Tomasik🇨🇿 · Barbara Antonina Trzeciak🇨🇿

   We present the first calculation of longitudinal decorrelation of anisotropic flow at RHIC Beam Energy Scan (BES) energies using event-by-event viscous hydrodynamic model (vHLLE), with two different initial states (GLISSANDO2 and UrQMD) and hadronic cascade. We investigate the origin of the observed decorrelation by checking separately flow angle and flow magnitude decorrelation and by calculating decorrelation in the initial state eccentricity.

   ↳ nucl-thnucl-exSciPost Phys.Proc.(2022)·0 citations
4. 04*

   ${}^{222}$Rn content variations at ground and underground conditions

   R.A.Etezov🇷🇺 · Yu.M.Gavrilyuk🇷🇺 · A.M.Gangapshev🇷🇺 · A.M.Gezhaev · V.V.Kazalov🇷🇺 · A.Kh.Khokonov🇷🇺 · V.V.Kuzminov · S.I.Panasenko🇺🇦 · S.S.Ratkevich🇺🇦

   The activity of ${}^{222}$Rn and its daughter isotopes was measured in the air of several underground laboratories of the Baksan Neutrino Observatory at various distances from the entrance. The measurements were carried out with the help of the cylindrical ionionization air chamber. We found that the radon content in the ventilated airflow within the measurement accuracy does not depend on the distance travelled along the adit. In addition, we observed that the radon content increases abruptly in those locations where underground gases and water are released. As a result, we review various mechanisms of air enrichment with radon. We also outline our research methodology and present the results of our measurements of radon release from the rocky walls of the underground laboratory. Finally, we present the results of the measurements of the radon content of various ground and underground water sources.

   ↳ physics.ins-detnucl-ex1 citation

* 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.