High-precision measurements of the atomic mass and electron-capture decay $Q$ value of $^{95}$Tc
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916465472438272 |
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| author | Ge, Zhuang Eronen, Tommi Sevestrean, Vasile Alin Niţescu, Ovidiu Stoica, Sabin Ramalho, Marlom Suhonen, Jouni de Roubin, Antoine Nesterenko, Dmitrii Kankainen, Anu Ascher, Pauline Andres, Samuel Ayet San Beliuskina, Olga Delahaye, Pierre Flayol, Mathieu Gerbaux, Mathias Grévy, Stéphane Hukkanen, Marjut Jaries, Arthur Jokinen, Ari Husson, Audric Kahl, Daid Kostensalo, Joel Kotila, Jenni Moore, Iain Nikas, Stylianos Stryjczyk, Marek Virtanen, Ville |
| author_facet | Ge, Zhuang Eronen, Tommi Sevestrean, Vasile Alin Niţescu, Ovidiu Stoica, Sabin Ramalho, Marlom Suhonen, Jouni de Roubin, Antoine Nesterenko, Dmitrii Kankainen, Anu Ascher, Pauline Andres, Samuel Ayet San Beliuskina, Olga Delahaye, Pierre Flayol, Mathieu Gerbaux, Mathias Grévy, Stéphane Hukkanen, Marjut Jaries, Arthur Jokinen, Ari Husson, Audric Kahl, Daid Kostensalo, Joel Kotila, Jenni Moore, Iain Nikas, Stylianos Stryjczyk, Marek Virtanen, Ville |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_05273 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | High-precision measurements of the atomic mass and electron-capture decay $Q$ value of $^{95}$Tc Ge, Zhuang Eronen, Tommi Sevestrean, Vasile Alin Niţescu, Ovidiu Stoica, Sabin Ramalho, Marlom Suhonen, Jouni de Roubin, Antoine Nesterenko, Dmitrii Kankainen, Anu Ascher, Pauline Andres, Samuel Ayet San Beliuskina, Olga Delahaye, Pierre Flayol, Mathieu Gerbaux, Mathias Grévy, Stéphane Hukkanen, Marjut Jaries, Arthur Jokinen, Ari Husson, Audric Kahl, Daid Kostensalo, Joel Kotila, Jenni Moore, Iain Nikas, Stylianos Stryjczyk, Marek Virtanen, Ville Nuclear Experiment Nuclear Theory 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. |
| title | High-precision measurements of the atomic mass and electron-capture decay $Q$ value of $^{95}$Tc |
| topic | Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2406.05273 |