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High-precision measurement of a low Q value for allowed β−-decay of 131I related to neutrino mass determination (2022)

Eronen, T., Ge, Z., de Roubin, A., Ramalho, M., Kostensalo, J., Kotila, J., Beliushkina, O., Delafosse, C., Geldhof, S., Gins, W., Hukkanen, M., Jokinen, A., Kankainen, A., Moore, I.D., Nesterenko, D.A., Stryjczyk, M., & Suhonen, J. (2022). High-precision measurement of a low Q value for allowed β−-decay of 131I related to neutrino mass determination. Physics Letters B, 830, Article 137135. https://doi.org/10.1016/j.physletb.2022.137135

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Julkaisun kaikki tekijät tai toimittajatEronen, T.; Ge, Z.; de Roubin, A.; Ramalho, M.; Kostensalo, J.; Kotila, J.; Beliushkina, O.; Delafosse, C.; Geldhof, S.; Gins, W.; et al.

Lehti tai sarjaPhysics Letters B








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Julkaisu on rinnakkaistallennettu (JYX)https://jyx.jyu.fi/handle/123456789/80992


The ground-state-to-ground-state β−-decay 131I (7/2+) → 131Xe (3/2+) Q value was determined with high precision utilizing the double Penning trap mass spectrometer JYFLTRAP at the IGISOL facility. The Q value of this β−-decay was found to be Q = 972.25(19) keV through a cyclotron frequency ratio measurement with a relative precision of 1.6 × 10−9. This was realized using the phase-imaging ion-cyclotron-resonance technique. The new Q value is more than 3 times more precise and 2.3σ higher (1.45 keV) than the value extracted from the Atomic Mass Evaluation 2020. Our measurement confirms that the β−-decay to the 9/2+ excited state at 971.22(13) keV in 131Xe is energetically allowed with a Q value of 1.03(23) keV while the decay to the 7/2+ state at 973.11(14) keV was found to be energetically
forbidden. Nuclear shell-model calculations with established two-body interactions, alongside an accurate phase-space factor and a statistical analysis of the log f t values of known allowed β decays, were used to estimate the partial half-life for the low-Q -value transition to the 9/2+ state. The half-life was found to be (1.97+2.24−0.89) ×107 years, which makes this candidate feasible for neutrino mass searches.


Vapaat asiasanatPenning trap; Low Q value; β− decay; Neutrino mass

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Viimeisin päivitys 2024-15-06 klo 20:26