High-precision direct decay energy measurements of the electron-capture decay of $^{97}$Tc
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arXiv
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2025
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| author | Ge, Zhuang Eronen, Tommi Sevestrean, Vasile Alin Ramalho, Marlom Nitescu, Ovidiu Ghinescu, Stefan Stoica, Sabin 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 Ruotsalainen, Jouni Stryjczyk, Marek Virtanen, Ville |
| author_facet | Ge, Zhuang Eronen, Tommi Sevestrean, Vasile Alin Ramalho, Marlom Nitescu, Ovidiu Ghinescu, Stefan Stoica, Sabin 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 Ruotsalainen, Jouni Stryjczyk, Marek Virtanen, Ville |
| contents | A direct measurement of the ground-state-to-ground-state electron-capture decay $Q$ ($Q_{\rm EC}$) value of $^{97}$Tc has been conducted employing the high resolving power phase-imaging ion-cyclotron-resonance technique with the double Penning trap mass spectrometer JYFLTRAP. The resulting $Q_{\rm EC}$ value for $^{97}$Tc is 324.82(21) keV, exhibiting a precision approximately 19 times higher than the value adopted in the newest Atomic Mass Evaluation (AME2020) and differing by 1.2$σ$. Furthermore, by combining this refined $Q$ value with nuclear energy-level data for the decay-daughter $^{97}$Mo, a potential ultra-low Q-value transition, possibly of allowed type, $^{97}$Tc (9/2$^{+}$, ground state) $\rightarrow$ $^{97}$Mo$^{*}$ (320(1) keV), was evaluated for future long-term neutrino-mass determination experiments. The ground-state-to-excited-state electron-capture decay $Q$ value ($Q^{*}_{\rm EC}$) of this transition was determined to be 4.8(10) keV, confirming it to be energetically allowed with a confidence level of exceeding 4$σ$. The captures of electrons occupying the L and higher shells for this transition are energetically allowed, giving a value of 2.0(10) keV for the closest distance of $Q^{*}_{\rm EC}$ to the allowed binding energy of the L1 shell. To predict partial half-lives and energy-release distributions for this transition, the atomic self-consistent many-electron Dirac--Hartree--Fock--Slater method and the nuclear shell model have been employed. Dominant correction terms such as exchange and overlap corrections, as well as shake-up and shake-off effects, were included in the final results. Moreover, the normalized distribution of released energy in the electron-capture decay of $^{97}$Tc to excited states of $^{97}$Mo, is compared with that of $^{163}$Ho, which is being used for electron-neutrino-mass determination. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_04490 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-precision direct decay energy measurements of the electron-capture decay of $^{97}$Tc Ge, Zhuang Eronen, Tommi Sevestrean, Vasile Alin Ramalho, Marlom Nitescu, Ovidiu Ghinescu, Stefan Stoica, Sabin 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 Ruotsalainen, Jouni Stryjczyk, Marek Virtanen, Ville Nuclear Experiment Nuclear Theory A direct measurement of the ground-state-to-ground-state electron-capture decay $Q$ ($Q_{\rm EC}$) value of $^{97}$Tc has been conducted employing the high resolving power phase-imaging ion-cyclotron-resonance technique with the double Penning trap mass spectrometer JYFLTRAP. The resulting $Q_{\rm EC}$ value for $^{97}$Tc is 324.82(21) keV, exhibiting a precision approximately 19 times higher than the value adopted in the newest Atomic Mass Evaluation (AME2020) and differing by 1.2$σ$. Furthermore, by combining this refined $Q$ value with nuclear energy-level data for the decay-daughter $^{97}$Mo, a potential ultra-low Q-value transition, possibly of allowed type, $^{97}$Tc (9/2$^{+}$, ground state) $\rightarrow$ $^{97}$Mo$^{*}$ (320(1) keV), was evaluated for future long-term neutrino-mass determination experiments. The ground-state-to-excited-state electron-capture decay $Q$ value ($Q^{*}_{\rm EC}$) of this transition was determined to be 4.8(10) keV, confirming it to be energetically allowed with a confidence level of exceeding 4$σ$. The captures of electrons occupying the L and higher shells for this transition are energetically allowed, giving a value of 2.0(10) keV for the closest distance of $Q^{*}_{\rm EC}$ to the allowed binding energy of the L1 shell. To predict partial half-lives and energy-release distributions for this transition, the atomic self-consistent many-electron Dirac--Hartree--Fock--Slater method and the nuclear shell model have been employed. Dominant correction terms such as exchange and overlap corrections, as well as shake-up and shake-off effects, were included in the final results. Moreover, the normalized distribution of released energy in the electron-capture decay of $^{97}$Tc to excited states of $^{97}$Mo, is compared with that of $^{163}$Ho, which is being used for electron-neutrino-mass determination. |
| title | High-precision direct decay energy measurements of the electron-capture decay of $^{97}$Tc |
| topic | Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2502.04490 |