Study of radial motion phase advance during motion excitations in a Penning trap and accuracy of JYFLTRAP mass spectrometer

Nesterenko, D. A.; Eronen, T.; Zhuang, G.; Kankainen, A.; Vilén, M.

doi:10.1140/epja/s10050-021-00608-3

“…The cyclotron frequencies of the parent nuclide ν p c and the daughter nuclide ν d c were alternately measured changing The systematic uncertainty due to non-linear changes of the magnetic field was negligible compared to the achieved statistical uncertainty [37]. The final cyclotron frequency ratio R was calculated as a weighted mean of R i .…”

Section: Experimental Methods and Resultsmentioning

confidence: 99%

High-precision Q-value measurement and nuclear matrix element calculations for the double-$$\beta $$ decay of $$^{98}$$Mo

Nesterenko

¹

,

Jokiniemi

²

,

Kotila

³

et al. 2022

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The $$^{98}$$ 98 Mo double-beta decay Q-value has been measured, and the corresponding nuclear matrix elements of neutrinoless double-beta ($$0\nu \beta \beta $$ 0 ν β β ) decay and the standard two-neutrino double-beta ($$2\nu \beta \beta $$ 2 ν β β ) decay have been provided by nuclear theory. The double-beta decay Q-value has been determined as $$Q_{\beta \beta }=113.668(68)$$ Q β β = 113.668 ( 68 ) keV using the JYFLTRAP Penning trap mass spectrometer. It is in agreement with the literature value, $$Q_{\beta \beta }=109(6)$$ Q β β = 109 ( 6 ) keV, but almost 90 times more precise. Based on the measured Q-value, precise phase-space factors for $$2\nu \beta \beta $$ 2 ν β β decay and $$0\nu \beta \beta $$ 0 ν β β decay, needed in the half-life predictions, have been calculated. Furthermore, the involved nuclear matrix elements have been computed in the proton–neutron quasiparticle random-phase approximation (pnQRPA) and the microscopic interacting boson model (IBM-2) frameworks. Finally, predictions for the $$2\nu \beta \beta $$ 2 ν β β decay are given, suggesting a much longer half-life than for the currently observed cases.

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“…The associated Birge ratio was about a unity. The systematic uncertainties specific to the PI-ICR method are discussed in [24]. The mass-dependent systematic effects for mass doublets are negligible [25], thus the statistical uncertainty is dominant in the final uncertainty.…”

Section: Experimental Methods and Resultsmentioning

confidence: 99%

Direct determination of the excitation energy of quasi-stable isomer $^{180m}$Ta

Nesterenko,

Blaum,

Delahaye

et al. 2022

Preprint

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180m Ta is a naturally abundant quasi-stable nuclide and the longest-lived nuclear isomer known to date. It is of interest for, among others, the search for dark matter, for the development of a gamma laser and for astrophysics. So far, its excitation energy has not been measured directly but has been based on an evaluation of available nuclear reaction data. We have determined the excitation energy of this isomer with high accuracy using the Penning-trap mass spectrometer JYFLTRAP. The determined mass difference between the ground and isomeric states of 180 Ta yields an excitation energy of 76.79(55) keV for 180m Ta. This is the first direct measurement of the excitation energy and provides a better accuracy than the previous evaluation value, 75.3(14) keV.

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“…A temporal fluctuation of the magnetic field δ B (ν re f )/ν re f = ∆t × 2.01(25) × 10 −12 /min [43], where ∆t is the time interval between two consecutive reference measurements, is considered in the analysis. Furthermore, a mass-dependent uncertainty of δ m (r)/r = ∆m × 2.35(81) × 10 −10 /u [43], was taken into account as there is one mass unit (1 u) difference of the two measured ion species.…”

Section: Initial Statementioning

confidence: 99%

“…A temporal fluctuation of the magnetic field δ B (ν re f )/ν re f = ∆t × 2.01(25) × 10 −12 /min [43], where ∆t is the time interval between two consecutive reference measurements, is considered in the analysis. Furthermore, a mass-dependent uncertainty of δ m (r)/r = ∆m × 2.35(81) × 10 −10 /u [43], was taken into account as there is one mass unit (1 u) difference of the two measured ion species. To check whether some other systematic error should be added due to this technique, a crosscheck [44] has been carried out using well-known mass pairs 77 Se-76 Se and 94 Mo-95 Mo [39,45], which both have one mass unit difference.…”

Section: Initial Statementioning

confidence: 99%

Observation of an ultra-low $Q$-value electron-capture channel decaying to $^{75}$As via high-precision mass measurement

Ramalho,

Ge,

Eronen

et al. 2022

Preprint

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A precise determination of the atomic mass of 75 As has been performed utilizing the double Penning trap mass spectrometer, JYFLTRAP. The mass excess is measured to be -73035.519(42) keV/c 2 , which is a factor of 21 more precise and 1.3(9) keV/c 2 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 75 Se and β − decay Q value of 75 Ge, 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 75 As * , we have determined the ground-state-to-excited-state Q values for two transitions of 75 Se → 75 As * and one transition of 75 Ge → 75 As * . 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 75 Se → 75 As * (865.40(50) keV) is revealed to be ultra-low (< 1 keV) and the first-ever confirmed EC transition possessing an ultra-low Q value from direct measurements.

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Study of radial motion phase advance during motion excitations in a Penning trap and accuracy of JYFLTRAP mass spectrometer

Cited by 33 publications

References 54 publications

High-precision Q-value measurement and nuclear matrix element calculations for the double-$$\beta $$ decay of $$^{98}$$Mo

High-precision Q-value measurement and nuclear matrix element calculations for the double-$$\beta $$ decay of $$^{98}$$Mo

Direct determination of the excitation energy of quasi-stable isomer $^{180m}$Ta

Observation of an ultra-low $Q$-value electron-capture channel decaying to $^{75}$As via high-precision mass measurement

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