Recent experiments at the JYFLTRAP Penning trap

Kankainen, A.; Eronen, T.; Nesterenko, D. A.; Roubin, A. de; Vilén, M.

doi:10.1007/s10751-020-01711-5

Cited by 8 publications

(9 citation statements)

References 68 publications

(113 reference statements)

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“…This study was inspired by the theoretical findings reported in [23]. The measurement confirmed that the decay is energetically allowed with an ultra-low value of 0.44 (31) keV, which makes this first-forbidden unique transition with a simple universal spectral shape a potential candidate for antineutrino-mass measurements with almost an order of magnitude lower value than in presently running or planned direct (anti)neutrino-mass experiments [28]. Also, the electron capture of 159 Dy (3∕2 − ) to the 5∕2 − state in 159 Tb was recently studied at JYFLTRAP [29].…”

Section: Introductionmentioning

confidence: 58%

“…The EC value of 111 In, the mass difference of the parent nucleus 111 In and its EC decaying daughter 111 Cd, was measured at the new Ion Guide Isotope Separator On-Line facility (IGISOL) utilizing the JYFLTRAP double Penning trap mass spectrometer [30,31], at the University of Jyväskylä [32,33]. A primary beam of protons with an energy of 40 MeV from the K-130 cyclotron impinged into a naturally abundant indium target with a thickness of a few mg/cm 2 at the entrance of the IGISOL gas cell [34].…”

Section: Experimental Methodsmentioning

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: Introductionmentioning

confidence: 58%

Section: Experimental Methodsmentioning

confidence: 99%

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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“…The first ultra-low Q-value decay, 115 In (9/2 + , ground state) → 115 Sn (9/2 + , excited state), was discovered by Cattadori et al [26] and the ultra-low Q value was confirmed by the JYFLTRAP Penning trap [27] and the FSU Penning trap [28]. The second ultra-low Q-value case of 135 Cs (7/2 + , ground state) decaying to 135 Ba (11/2 − , second excited state) was dis-covered at JYFLTRAP [21,29] recently. These are the only two cases that are confirmed to possess ultra-low Q values from direct measurements, and they both belong to the category of β − decay.…”

Section: Introductionmentioning

confidence: 87%

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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“…Since atomic masses obtained via nuclear reaction data are not always reliable, and because the mass of 114 Cd was determined from an older mass spectrometry technique, a direct Penning trap measurement of the 115 Cd Q value is called for. Recently, the ground-state Q value of 135 Cs was measured with the JYFLTRAP Penning trap and the Q value of the potential UL decay branch was determined to be Q UL = 0.44 (31) keV [23], showing that it is indeed energetically allowed with Q UL < 1 keV.…”

Section: Introductionmentioning

confidence: 99%

“…The JYFLTRAP group recently ruled out potential UL Q value decays in 72 As [29], and showed that 159 Dy does have an electron capture decay branch to an excited state in the daughter with a Q UL value of around 1 keV [30]. They are also investigating other candidates [31].…”

Section: Introductionmentioning

confidence: 99%

Precise Q value measurements of $^{112,113}$Ag and $^{115}$Cd with the Canadian Penning trap for evaluation of potential ultra-low Q value $β$-decays

Gamage¹,

Sandler²,

Buchinger³

et al. 2022

Preprint

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Background: An ultra-low Q value β-decay can occur from a parent nuclide to an excited nuclear state in the daughter such that QUL 1 keV. These decay processes are of interest for nuclear β-decay theory and as potential candidates in neutrino mass determination experiments. To date, only one ultra-low Q value β-decay has been observed-that of 115 In with Q β = 147(10) eV. A number of other potential candidates exist, but improved mass measurements are necessary to determine if these decay channels are energetically allowed and, in fact, ultra-low.Purpose: To perform precise β-decay Q value measurements of 112,113 Ag and 115 Cd and to use them in combination with nuclear energy level data for the daughter isotopes 112,113 Cd and 115 In to determine if the potential ultra-low Q value β-decay branches of 112,113 Ag and 115 Cd are energetically allowed and 1 keV. Method:The Canadian Penning Trap at Argonne National Laboratory was used to measure the cyclotron frequency ratios of singly-charged 112,113 Ag and 115 Cd ions with respect to their daughters 112,113 Cd and 115 In. From these measurements, the ground-state to ground-state β-decay Q values were obtained. Results: The 112 Ag → 112 Cd, 113 Ag → 113 Cd, and 115 Cd → 115 In β-decay Q values were measured to be Q β ( 112 Ag) = 3990.16(22) keV, Q β ( 113 Ag) = 2085.7(4.6) keV, and Q β ( 115 Cd) = 1451.36(34) keV. These results were compared to energies of excited states in 112 Cd at 3997.75(14) keV, 113 Cd at 2015.6(2.5) and 2080(10) keV, and 115 In at 1448.787(9) keV, resulting in precise QUL values for the potential decay channels of -7.59(26) keV, 6(11) keV, and 2.57(34) keV, respectively. Conclusion:The potential ultra-low Q value decays of 112 Ag and 115 Cd have been ruled out. 113 Ag is still a possible candidate until a more precise measurement of the 2080(10) keV, 1/2 + state of 113 Cd is available. In the course of this work we have found the ground state mass of 113 Ag reported in the 2020 Atomic Mass Evaluation [Wang, et al., Chin. Phys. C 45, 030003 (2021)] to be lower than our measurement by 69(17) keV (a 4σ discrepancy).

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Recent experiments at the JYFLTRAP Penning trap

Cited by 8 publications

References 68 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

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

Precise Q value measurements of $^{112,113}$Ag and $^{115}$Cd with the Canadian Penning trap for evaluation of potential ultra-low Q value $β$-decays

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