Observation of an ultralow-Q-value electron-capture channel decaying to 75As via a high-precision mass measurement
Ramalho, M., Ge, Z., Eronen, T., Nesterenko, D. A., Jaatinen, J., Jokinen, A., Kankainen, A., Kostensalo, J., Kotila, J., Krivoruchenko, M. I., Suhonen, J., Tyrin, K. S., & Virtanen, V. (2022). Observation of an ultralow-Q-value electron-capture channel decaying to 75As via a high-precision mass measurement. Physical Review C, 106(1), Article 015501. https://doi.org/10.1103/PhysRevC.106.015501
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Physical Review CAuthors
Ge, Z. |
Date
2022Copyright
©2022 American Physical Society
A precise determination of the atomic mass of 75As has been performed utilizing the double Penning trap mass spectrometer, JYFLTRAP. The mass excess is measured to be −73035.519(42)keV/c2, which is a factor of 21 more precise and 1.3(9)keV/c2 lower than the adopted value in the newest Atomic Mass Evaluation (AME2020). This value has been used to determine the ground-state–to–ground-state electron-capture decay Q value of 75Se and β− decay Q value of 75Ge, which are derived to be 866.041(81) keV and 1178.561(65) keV, respectively. Using the nuclear energy-level data of 860.00(40) keV, 865.40(50) keV (final states of electron capture), and 1172.00(60) keV (final state of β− decay) for the excited states of 75As∗, we have determined the ground-state–to–excited-state Q values for two transitions of 75Se→75As∗ and one transition of 75Ge→75As∗. The ground-state–to–excited-state Q values are determined to be 6.04(41) keV, 0.64(51) keV, and 6.56(60) keV, respectively, thus confirming that the three low Q-value transitions are all energetically valid and one of them is a possible candidate channel for antineutrino mass determination. Furthermore, the ground-state–to–excited-state Q value of transition 75Se→75As∗ [865.40(50) keV] is revealed to be ultralow (<1 keV) and the first-ever confirmed electron capture transition possessing an ultralow Q value from direct measurements.
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https://converis.jyu.fi/converis/portal/detail/Publication/151671720
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Research Council of Finland; European CommissionFunding program(s)
Research costs of Academy Research Fellow, AoF; Academy Research Fellow, AoF; Academy Project, AoF; ERC Consolidator Grant![](/themes/JYX2/images/funders/erc_logo_thumb.jpg)
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The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about funding
We acknowledge the support by the Academy of Finland under the Finnish Centre of Excellence Programme 2012–2017 (Nuclear and Accelerator Based Physics Research at JYFL) and projects Nos. 306980, 312544, 275389, 284516, 295207, 314733, 318043, 327629, and 320062. The support by the EU Horizon 2020 research and innovation program under Grant No. 771036 (ERC CoG MAIDEN) is acknowledged. The experiment was carried out in the year 2021.![showless](/themes/JYX2//images/showless.png)
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