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Pré-Publication, Document De Travail Année : 2024

High-precision measurements of the atomic mass and electron-capture decay $Q$ value of $^{95}$Tc

Zhuang Ge
  • Fonction : Auteur
Tommi Eronen
  • Fonction : Auteur
Vasile Alin Sevestrean
  • Fonction : Auteur
Ovidiu Niţescu
  • Fonction : Auteur
Sabin Stoica
  • Fonction : Auteur
Marlom Ramalho
  • Fonction : Auteur
Jouni Suhonen
  • Fonction : Auteur
Dmitrii Nesterenko
  • Fonction : Auteur
Anu Kankainen
  • Fonction : Auteur
Samuel Ayet San Andres
  • Fonction : Auteur
Olga Beliuskina
  • Fonction : Auteur
Arthur Jaries
  • Fonction : Auteur
Ari Jokinen
  • Fonction : Auteur
Daid Kahl
  • Fonction : Auteur
Joel Kostensalo
  • Fonction : Auteur
Jenni Kotila
  • Fonction : Auteur
Iain Moore
  • Fonction : Auteur
Stylianos Nikas
  • Fonction : Auteur
Marek Stryjczyk
  • Fonction : Auteur
Ville Virtanen
  • Fonction : Auteur

Résumé

A direct measurement of the ground-state-to-ground-state electron-capture decay $Q$ value of $^{95}$Tc has been performed utilizing the double Penning trap mass spectrometer JYFLTRAP. The $Q$ value was determined to be 1695.92(13) keV by taking advantage of the high resolving power of the phase-imaging ion-cyclotron-resonance technique to resolve the low-lying isomeric state of $^{95}$Tc (excitation energy of 38.910(40) keV) from the ground state. The mass excess of $^{95}$Tc was measured to be $-$86015.95(18) keV/c$^2$, exhibiting a precision of about 28 times higher and in agreement with the value from the newest Atomic Mass Evaluation (AME2020). Combined with the nuclear energy-level data for the decay-daughter $^{95}$Mo, two potential ultra-low $Q$-value transitions are identified for future long-term neutrino-mass determination experiments. The atomic self-consistent many-electron Dirac--Hartree--Fock--Slater method and the nuclear shell model have been used to predict the partial half-lives and energy-release distributions for the two transitions. The dominant correction terms related to those processes are considered, including the exchange and overlap corrections, and the shake-up and shake-off effects. The normalized distribution of the released energy in the electron-capture decay of $^{95}$Tc to excited states of $^{95}$Mo is compared to that of $^{163}$Ho currently being used for electron-neutrino-mass determination.

Dates et versions

hal-04609536 , version 1 (12-06-2024)

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Zhuang Ge, Tommi Eronen, Vasile Alin Sevestrean, Ovidiu Niţescu, Sabin Stoica, et al.. High-precision measurements of the atomic mass and electron-capture decay $Q$ value of $^{95}$Tc. 2024. ⟨hal-04609536⟩
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