A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Direct high-precision measurement of the mass difference of 77As–77Se related to neutrino mass determination (2024)

Ge, Z., Eronen, T., Ramalho, M., de Roubin, A., Nesterenko D., A., Kankainen, A., Beliuskina, O., de Groote, R., Geldhof, S., Gins, W., Hukkanen, M., Jokinen, A., Koszorús, Á., Kotila, J., Kostensalo, J., Moore I., D., Pirinen, P., Raggio, A., Rinta-Antila, S., . . . Zadvornaya, A. (2024). Direct high-precision measurement of the mass difference of 77As–77Se related to neutrino mass determination. European Physical Journal A, 60(5), Article 104. https://doi.org/10.1140/epja/s10050-024-01317-3

JYU-tekijät tai -toimittajat

Ge, Zhuang
Eronen, Tommi
De Oliveira Ramalho, Marlom
Nesterenko, Dmitrii
Kankainen, Anu
Beliuskina, Olga
de Groote, Ruben
Geldhof, Sarina
Gins, Wouter
Hukkanen, Marjut
Jokinen, Ari
Kotila, Jenni
Moore, Iain
Pirinen, Pekka
Raggio, Andrea
Rinta-Antila, Sami
Suhonen, Jouni
Virtanen, Ville
Zadvornaya, Alexandra

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Ge, Z.; Eronen, T.; Ramalho, M.; de Roubin, A.; Nesterenko D., A.; Kankainen, A.; Beliuskina, O.; de Groote, R.; Geldhof, S.; Gins, W.; et al.

Lehti tai sarja: European Physical Journal A

ISSN: 1434-6001

eISSN: 1434-601X

Julkaisuvuosi: 2024

Ilmestymispäivä: 08.05.2024

Volyymi: 60

Lehden numero: 5

Artikkelinumero: 104

Kustantaja: Springer

Julkaisumaa: Saksa

Julkaisun kieli: englanti

DOI: https://doi.org/10.1140/epja/s10050-024-01317-3

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Osittain avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/95487

Julkaisu on rinnakkaistallennettu: https://arxiv.org/abs/2401.15242

Tiivistelmä

The first direct determination of the ground-state-to-ground-state β−-decay Q-value of 77As to 77Se was performed by measuring their atomic mass difference utilizing the double Penning trap mass spectrometer, JYFLTRAP. The resulting Q-value is 684.463(70) keV, representing a remarkable 24-fold improvement in precision compared to the value reported in the most recent Atomic Mass Evaluation (AME2020). With the significant reduction of the uncertainty of the ground-state-to-ground-state Q-value and knowledge of the excitation energies in 77Se from γ-ray spectroscopy, the ground-state-to-excited-state Q-value of the transition 77As (3/2−, ground state) → 77Se∗ (5/2+, 680.1035(17) keV) was refined to be 4.360(70) keV. We confirm that this potential low Q-value β−-decay transition for neutrino mass determination is energetically allowed at a confidence level of about 60σ. Nuclear shell-model calculations with two well-established effective Hamiltonians were used to estimate the partial half-life for the low Q-value transition. The half-life was found to be of the order of 109 years for this first-forbidden non-unique transition, which rules out this candidate a potential source for rare-event experiments searching for the electron antineutrino mass.

YSO-asiasanat: ydinfysiikka; hiukkasfysiikka; neutriinot; massa (fysiikka)

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