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 Electron-Capture: A New Candidate for Neutrino Mass Determination

Zhuang, G.; Eronen, T.; Tyrin, K. S.; Kotila, J.; Kostensalo, Joel; Nesterenko, D. A.; Beliuskina, O.; Groote, R. P. de; Roubin, A. de; Geldhof, S.; Gins, W.; Hukkanen, M.; Jokinen, A.; Kankainen, A.; Koszorús, Á.; Krivoruchenko, M. I.; Kujanpää, S.; Moore, Iain; Raggio, A.; Rinta‐Antila, S.; Suhonen, J.; Virtanen, V.; Weaver, A.; Zadvornaya, A.

doi:10.1103/physrevlett.127.272301

Cited by 24 publications

(14 citation statements)

References 38 publications

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“…The electron shell structure is modeled using the software package GRASP2018 [60]. [71,12]. For the considered value of EC , the level 2 1∕2 shows up in the physical region as a narrow peak with a width of 2.42 eV [72] at a distance of 3 eV from the endpoint.…”

Section: Ec Rate Estimates and Energy Spectrummentioning

confidence: 99%

“…The energy is carried away by the neutrino without interactions. For comparison, the EC spectra in 159 Dy and 163 Ho are shown [71,12]. The spectra are normalized to a unit area.…”

Section: Ec Rate Estimates and Energy Spectrummentioning

confidence: 99%

“…Symbols M1, M2, N1, O1 indicate electron holes formed in the 111 Cd atom; the holes N2 and O2, which are faintly distinguishable, are not indicated. The EC energy spectra in 159 Dy and 163 Ho atoms are from Refs [71,12]…”

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confidence: 99%

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High-precision electron-capture $Q$ value measurement of $^{111}$In for electron-neutrino mass determination

Ge,

Eronen,

deRoubin

et al. 2022

Preprint

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A precise determination of the ground state 111 In (9∕2 + ) electron capture to ground state of 111 Cd (1∕2 + ) value has been performed utilizing the double Penning trap mass spectrometer, JYFLTRAP. A value of 857.63(17) keV was obtained, which is nearly a factor of 20 more precise than the value extracted from the Atomic Mass Evaluation 2020 (AME2020). The high-precision electron-capture value measurement along with the nuclear energy level data of 866.60(6) keV, 864.8(3) keV, 855.6(10) keV, and 853.94(7) keV for 111 Cd was used to determine whether the four states are energetically allowed for a potential ultra-low -value decay or electron-capture decay. Our results confirm that the excited states of 866.60(6) keV with spin-parity ( ) of 3/2 + and 864.8(3) keV with = 3/2 + are ruled out due to their deduced electron-capture value being smaller than 0 keV at the level of around 20 and 50 , respectively. Electron-capture decays to the excited states at 853.94( 7) keV ( = 7/2 + ) and 855.6( 10) keV ( = 3/2 + ), are energetically allowed with values of 3.69(19) keV and 2.0(10) keV, respectively. The allowed decay transition 111 In (9/2 + ) → 111 Cd (7/2 + ), with a value of 3.69( 19) keV, is a potential a new candidate for neutrino-mass measurements by future EC experiments featuring new powerful detection technologies. The results show that the indium level 2 1∕2 for this decay branch leads to a significant increase in the number of EC events in the energy region sensitive to the electron neutrino mass.

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Section: Ec Rate Estimates and Energy Spectrummentioning

confidence: 99%

“…The energy is carried away by the neutrino without interactions. For comparison, the EC spectra in 159 Dy and 163 Ho are shown [71,12]. The spectra are normalized to a unit area.…”

Section: Ec Rate Estimates and Energy Spectrummentioning

confidence: 99%

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High-precision electron-capture $Q$ value measurement of $^{111}$In for electron-neutrino mass determination

Ge,

Eronen,

deRoubin

et al. 2022

Preprint

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“…A low, especially ultra-low (< 1 keV), Q-value β or EC decay is of great interest for possible future (anti)neutrinomass determination experiments [13][14][15][16][17]. If an excited state in the daughter nucleus can be found with an excitation energy close to the mass difference of the parent and decay-daughter atoms, which is equal to the ground-state-to-ground-state Q value, the decay energy of the corresponding transition can be very low.…”

Section: Introductionmentioning

confidence: 99%

“…Two potential ultra-low Q value candidate transitions, β − decay 76 As (ground-state) → 76 Se * (680.1035 (17) keV [22]) and EC 155 Tb (ground-state) → 155 Gd * (2968.4 (7) keV [22]), are of particular interest. Both of the transitions are possibly of the allowed type as shown in Table I.…”

Section: Introductionmentioning

confidence: 99%

Direct determination of the atomic mass difference of the pairs $^{76}$As-$^{76}$Se and $^{155}$Tb-$^{155}$Gd rules out $^{76}$As and $^{155}$Tb as possible candidates for electron (anti)neutrino mass measurements

Ge,

Eronen,

de Roubin

et al. 2022

Preprint

Self Cite

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The first direct determination of the ground-state-to-ground-state Q values of the β − decay 76 As → 76 Se and the electron-capture decay 155 Tb → 155 Gd was performed utilizing the double Penning trap mass spectrometer JYFLTRAP. By measuring the atomic mass difference of the decay pairs via the phase-imaging ioncyclotron-resonance (PI-ICR) technique, the Q values of 76 As → 76 Se and 155 Tb → 155 Gd were determined to be 2959.265(74) keV and 814.94(18) keV, respectively. The precision was increased relative to earlier measurements by factors of 12 and 57, respectively. The new Q values are 1.33 keV and 5 keV lower compared to the values adopted in the most recent Atomic Mass Evaluation 2020. With the newly determined groundstate-to-ground-state Q values combined with the excitation energy from γ-ray spectroscopy, the Q values for ground-state-to-excited-state transitions 76 As (ground state) → 76 Se * (2968.4(7) keV) and 155 Tb (ground state) → 155 Gd * (815.731(3) keV) were derived to be -9.13(70) keV and -0.79(18) keV. Thus we have confirmed that both of the β − -decay and EC-decay candidate transitions are energetically forbidden at a level of at least 4σ , thus definitely excluding these two cases from the list of potential candidates for the search of low-Q-value β − or EC decays to determine the electron-(anti)neutrino mass.

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Neutrino Mass Measurements Using Cryogenic Detectors

Gastaldo

2022

J Low Temp Phys

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The determination of the absolute mass scale of neutrinos is one of the most important challenges in Particle Physics. The shape of the endpoint region of $$\beta ^-$$ β - -decay and electron capture (EC) spectra depends on the phase space factor, which, in turn, is function of the masses of the neutrino mass eigenstates. High energy resolution and high statistics measurements of $$\beta ^-$$ β - and EC spectra are therefore considered a model-independent way for the determination of the neutrino mass scale. Since almost four decades, low temperature microcalorimeters are used for the measurement of low energy $$\beta ^-$$ β - and EC spectra. The first efforts were focused on the development of large arrays for the measurement of the $$^{187}$$ 187 Re $$\beta ^-$$ β - -spectrum. In the last ten years, the attention moved to EC of $$^{163}$$ 163 Ho. This choice was mainly motivated by the very good performance which could be achieved with low temperature microcalorimeters enclosing $$^{163}$$ 163 Ho with respect to microcalorimeters with absorber containing $$^{187}$$ 187 Re. The development of low temperature microcalorimeters for the measurement of the finite neutrino mass is discussed and, in particular, the reasons for moving from $$^{187}$$ 187 Re to $$^{163}$$ 163 Ho. The possibility to reach sub-eV sensitivity on the effective electron neutrino mass with $$^{163}$$ 163 Ho, thanks to the multiplexing of large microcalorimeter arrays is demonstrated. In conclusion, an overview on other nuclides which have been proposed as good candidates, motivated by the excellent performance of low temperature microcalorimeters is presented.

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Dy159 Electron-Capture: A New Candidate for Neutrino Mass Determination

Cited by 24 publications

References 38 publications

High-precision electron-capture $Q$ value measurement of $^{111}$In for electron-neutrino mass determination

High-precision electron-capture $Q$ value measurement of $^{111}$In for electron-neutrino mass determination

Direct determination of the atomic mass difference of the pairs $^{76}$As-$^{76}$Se and $^{155}$Tb-$^{155}$Gd rules out $^{76}$As and $^{155}$Tb as possible candidates for electron (anti)neutrino mass measurements

Neutrino Mass Measurements Using Cryogenic Detectors

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