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

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.

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Publication Details

Journal
Physics Letters B
Published
2024-10-24
DOI
https://doi.org/10.1016/j.physletb.2024.139094
Citations
3
Primary Topic
Radioactive Decay and Measurement Techniques
Type
article
Field-Weighted Citation Impact
1.82

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article

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

Z. W. Ge, Ovidiu Niţescu, M. Hukkanen, J. Kotila et al.
3 citations
Physics Letters B
Radioactive Decay and Measurement Techniques
1.82
article

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

Z. W. Ge, Ovidiu Niţescu, M. Hukkanen, J. Kotila, P. Ascher, D. A. Nesterenko, A. Jokinen, M. Ramalho, D. Kahl, V. Virtanen, J. Suhonen, M. Gerbaux, A. Husson, Vasile Alin Sevestrean, A. Kankainen, S. Grévy, A. de Roubin, S. Ayet, T. Eronen, S. Nikas, A. Jaries, Sabin Stoica, P. Delahaye, Joel Kostensalo, M. Stryjczyk, O. Beliuskina, M. Flayol, I. D. Moore
article en
3 citations

Abstract

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.

Physics Letters BVol. 859
Centre National de la Recherche Scientifique (FR), University of Bucharest (RO), Université de Bordeaux (FR), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), Instituto de Física Corpuscular (ES), Laboratoire de Physique des deux infinis Bordeaux (FR), Institut National de Physique Nucléaire et de Physique des Particules (FR), Grand Accélérateur National d'Ions Lourds (FR), University of Jyväskylä (FI), KU Leuven (BE)
Ministerul Cercetării, Inovării şi Digitalizării, European Commission, Deutscher Akademischer Austauschdienst, Deutsche Forschungsgemeinschaft, Academy of Finland, Jyväskylän Yliopisto, Academia Româna, Horizon 2020 Framework Programme, Horizon 2020
Openalex Percentile: Top 15%
Radioactive Decay and Measurement Techniques
1.82
DOIOpen Access PDFOpenAlex
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