Mon·Aug 5, 2024Monday·August 5, 2024

1. 01*

   Comment on "Surface nuclear spin relaxation of ${}^{199}$Hg," [J. Chem. Phys. 120, 1511 (2004)]

   S.K. Lamoreaux🇺🇸

   The possible use of optically pumped ${}^{199}$Hg nuclear spin magnetometry for fundamental physics studies, particularly in the search for electric dipole moments, remains of great interest. Understanding surface-induced relaxation is necessary for the development of both large- and small-volume cells that have a long and stable nuclear spin lifetime. Such cells are critical to several ongoing experiments, including the measurement of the neutron electric dipole moment, zero or otherwise. ${}^{199}$Hg, due to its large mass, has a multitude of bound surface states that affect the interaction time with the surface and are an important factor in the interpretation of previously acquired data. It is shown that the inclusion of these states brings consistency to the derived surface interaction properties.

   nucl-exJ.Chem.Phys.(2025)·0 citations
2. 02*

   Restricting Sterile Neutrinos by Neutrinoless Double Beta Decay

   Sudip Jana🇩🇪 · Lucas Puetter🇩🇪 · Alexei Yu. Smirnov🇩🇪

   The bounds on parameters of the eV and higher scale sterile neutrinos from the $0\nu \beta \beta$ decay have been refined and updated. We present a simple and compact analytic expression for the bound in the $\Delta m_{41}^2-{\sin }^{2}2{\theta }_{14}$ plane, which includes all relevant parameters. Dependencies of the bound on unknown CP-phases and the type of mass spectrum of light neutrinos (mass ordering and level of degeneracy) are studied in detail. We have computed the bounds using the latest and most stringent data from KamLAND-Zen. The projected constraints from future experiments are estimated. The obtained bounds are confronted with positive indications of the presence of sterile neutrinos as well as with the other existing bounds. The $0\nu \beta \beta$ decay results exclude the regions of parameters implied by BEST and Neutrino-4, and the regions indicated by LSND and MiniBooNE are in conflict with $0\nu \beta \beta$ results combined with ${\nu }_{\mu }-$ disappearance bounds.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2025)·8 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.