Physics Letters B (Dec 2024)
High-precision measurements of the atomic mass and electron-capture decay Q value of 95Tc
- Zhuang Ge,
- Tommi Eronen,
- Vasile Alin Sevestrean,
- Ovidiu Niţescu,
- Sabin Stoica,
- Marlom Ramalho,
- Jouni Suhonen,
- Antoine de Roubin,
- Dmitrii Nesterenko,
- Anu Kankainen,
- Pauline Ascher,
- Samuel Ayet San Andres,
- Olga Beliuskina,
- Pierre Delahaye,
- Mathieu Flayol,
- Mathias Gerbaux,
- Stéphane Grévy,
- Marjut Hukkanen,
- Arthur Jaries,
- Ari Jokinen,
- Audric Husson,
- Daid Kahl,
- Joel Kostensalo,
- Jenni Kotila,
- Iain Moore,
- Stylianos Nikas,
- Marek Stryjczyk,
- Ville Virtanen
Affiliations
- Zhuang Ge
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland; Corresponding authors at: Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland.
- Tommi Eronen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
- Vasile Alin Sevestrean
- International Centre for Advanced Training and Research in Physics (CIFRA), POB MG-12, RO-077125, Bucharest-Măgurele, Romania; Faculty of Physics, University of Bucharest, 405 Atomiştilor, POB MG-11, RO-077125, Bucharest-Măgurele, Romania; “Horia Hulubei” National Institute of Physics and Nuclear Engineering, 30 Reactorului, POB MG-6, RO-077125, Bucharest-Măgurele, Romania; Corresponding author at: International Centre for Advanced Training and Research in Physics (CIFRA), POB MG-12, RO-077125, Bucharest-Măgurele, Romania.
- Ovidiu Niţescu
- International Centre for Advanced Training and Research in Physics (CIFRA), POB MG-12, RO-077125, Bucharest-Măgurele, Romania; “Horia Hulubei” National Institute of Physics and Nuclear Engineering, 30 Reactorului, POB MG-6, RO-077125, Bucharest-Măgurele, Romania
- Sabin Stoica
- International Centre for Advanced Training and Research in Physics (CIFRA), POB MG-12, RO-077125, Bucharest-Măgurele, Romania
- Marlom Ramalho
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
- Jouni Suhonen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland; International Centre for Advanced Training and Research in Physics (CIFRA), POB MG-12, RO-077125, Bucharest-Măgurele, Romania; Corresponding authors at: Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland.
- Antoine de Roubin
- KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001, Leuven, Belgium; Université de Bordeaux, CNRS/IN2P3, UMR 5797, F-33170, Gradignan, France
- Dmitrii Nesterenko
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
- Anu Kankainen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
- Pauline Ascher
- Université de Bordeaux, CNRS/IN2P3, UMR 5797, F-33170, Gradignan, France
- Samuel Ayet San Andres
- Instituto de Fisica Corpuscular, CSIC-UV, 46980, Gradignan, Spain
- Olga Beliuskina
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
- Pierre Delahaye
- GANIL, CEA/DSM-CNRS/IN2P3, Bd Henri Becquerel, 14000, Caen, France
- Mathieu Flayol
- Université de Bordeaux, CNRS/IN2P3, UMR 5797, F-33170, Gradignan, France
- Mathias Gerbaux
- Université de Bordeaux, CNRS/IN2P3, UMR 5797, F-33170, Gradignan, France
- Stéphane Grévy
- Université de Bordeaux, CNRS/IN2P3, UMR 5797, F-33170, Gradignan, France
- Marjut Hukkanen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland; Université de Bordeaux, CNRS/IN2P3, LP2I Bordeaux, UMR 5797, F-33170, Gradignan, France
- Arthur Jaries
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
- Ari Jokinen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
- Audric Husson
- Université de Bordeaux, CNRS/IN2P3, UMR 5797, F-33170, Gradignan, France
- Daid Kahl
- Extreme Light Infrastructure - Nuclear Physics, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 077125, Bucharest-Magurele, Romania
- Joel Kostensalo
- Natural Resources Institute Finland, Yliopistokatu 6B, FI-80100, Joensuu, Finland
- Jenni Kotila
- International Centre for Advanced Training and Research in Physics (CIFRA), POB MG-12, RO-077125, Bucharest-Măgurele, Romania; Finnish Institute for Educational Research, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland; Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, CT 06520-8120, USA
- Iain Moore
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
- Stylianos Nikas
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
- Marek Stryjczyk
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
- Ville Virtanen
- Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
- Journal volume & issue
-
Vol. 859
p. 139094
Abstract
A direct measurement of the ground-state-to-ground-state electron-capture decay Q value of 95Tc 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 95Tc (excitation energy of 38.910(40) keV) from the ground state. The mass excess of 95Tc was measured to be −86015.95(18) keV/c2, 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 95Mo, 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 95Tc to excited states of 95Mo is compared to that of 163Ho currently being used for electron-neutrino-mass determination.
