Resonant Enhancement of Neutrinoless Double-Electron Capture in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Gd</mml:mi><mml:mprescripts /><mml:none /><mml:mn>152</mml:mn></mml:mmultiscripts></mml:math>

Eliseev, Sergey; Roux, Christian; Blaum, Klaus; Block, M.; Droese, C.; Herfurth, F.; Kluge, H.-J.; Krivoruchenko, M. I.; Novikov, Yu. N.; Ramirez, E. Minaya; Schweikhard, L.; Shabaev, V. M.; Šimkovic, F.; Tupitsyn, I. I.; Zuber, Κ.; Zubova, N. A.

doi:10.1103/physrevlett.106.052504

Cited by 96 publications

(63 citation statements)

References 29 publications

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“…In total 19 frequency ratios were recorded with a weighted average of r = 1.0102223437 (35). The Birge ratio [43] of 0.88 (11) for this measurement indicates a negligible overestimation of the individual statistical uncertainties. The systematic shift due to the difference in the mass-to-charge ratio between the two ion species was accounted for by correcting the frequency ratio by 4.0 × 10 −10 .…”

Section: Resultsmentioning

confidence: 94%

“…While one transition in the 156 Dy decay was found to be almost perfectly resonant, the capture of two electrons from outer shells (M 1 N 3 ) reduces the nuclear matrix element significantly [12]. In case of 152 Gd the resonance could not be confirmed with ∆ = 0.91 (18) keV, but the nuclear matrix element is significantly higher due to the electron capture from the inner orbitals (KL 1 ) [13]. For 190 Pt, however, the situation is fortunate as several close-lying transitions can even enable a double resonance.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, several Penning trap experiments around the world started to measure Q εε values directly [6][7][8][9][10][11][12][13][14][15][16][17][18]. Up to now, resonant enhancement was found in two of the candidates, 152 Gd and 156 Dy, with an enhancement of up to 7.7 × 10 8 for the latter [12,13]. Among the list of potential resonantly enhanced doubleelectron captures, only the Q εε value of 190 Pt remained with an uncertainty of more than 1 keV.…”

Section: Introductionmentioning

confidence: 99%

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Double resonant enhancement in the neutrinoless double-electron capture ofPt190

et al. 2016

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Background: The observation of neutrinoless double-beta transitions would indicate physics beyond the standard model as the lepton number conservation is violated. For a complete degeneracy in the energy of the initial and final states, the neutrinoless double-electron capture is resonantly enhanced. This shortens the half-life to similar orders of magnitude as the neutrinoless double-beta decay and expands the set of nuclei for the search of neutrinoless double-beta transitions as the observation of either process would be equally likely. Purpose: In order to clearly identify transitions that are resonantly enhanced, among other parameters the total energy of the decay, Qεε, needs to be measured very precisely. Of the twelve initially identified candidates, the last remaining decay without a precise Qεε was 190 Pt(0νεε) 190 Os. Method: The Qεε value was determined with the Penning trap mass spectrometer LEBIT by measuring the ratio of the cyclotron frequencies of 190 Pt + and 190 Os + in a 9.4 T superconducting magnet. Result: The Qεε value was determined to be 1401.57(47) keV with an uncertainty reduction of an order of magnitude compared to its previously known value. The absolute value is shifted by 17.17(623) keV relative to the previously accepted one. Furthermore, the mass value of 190 Pt was found to be shifted by more than three standard deviations. In addition we improved the mass values for 186,190 Os, 194 Pt. Conclusion: Transitions to the two nuclear excited states of 190 Os with 1326.9(5) keV and 1387.00(2) keV energy were identified to be resonantly enhanced within a 1σ uncertainty. The significantly reduced uncertainty of Qεε confirmed the potential for a resonantly enhanced transition.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Double resonant enhancement in the neutrinoless double-electron capture ofPt190

et al. 2016

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“…This method is used at different facilities such as CPT [10], ISOLTRAP [11], JYFLTRAP [12], LEBIT [13], SHIPTRAP [14,15], SMILETRAP [16], TITAN [17] and TRIGA-TRAP [18,19]. A reduction of the uncertainty on the resonance frequency determination is achieved by applying Ramsey's method of separated oscillatory fields [20,21] compared to conventional one-pulse excitation [16,[22][23][24][25].…”

Section: Introductionmentioning

confidence: 98%

One- and two-pulse quadrupolar excitation schemes of the ion motion in a Penning trap investigated with FT-ICR detection

et al. 2012

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In a Penning ion trap the interconversion between the radial motional modes of stored particles can be accomplished by applying one- and two-pulse (Ramsey) azimuthal quadrupolar radio frequency fields. In this work the interaction of ions with the excitation fields has been probed by Fourier transform ion cyclotron resonance (FT-ICR) detection. A theoretical description of this interaction is derived by use of a quasi-classical coherent state and the interconversion of modes is interpreted in a quantum-mechanical context. The dipolar-detection FT-ICR signal at the modified cyclotron frequency has been studied as a function of the interaction parameters such as excitation frequency, amplitude and duration and is compared with the theoretical results

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“…To enable these ultra-high accuracies, Pentatrap employs a non-destructive imagecurrent detection technique [33], using a highly sensitive cryogenic detection system and a stack of five Penning traps. The mass ratios measured at Pentatrap will contribute arXiv:1110.2919v1 [physics.atom-ph] 13 Oct 2011 to a determination of neutrino properties [3,34]. To this end, the mass difference between the initial and final nucleus of radioactive processes of interest must be determined.…”

Section: Introductionmentioning

confidence: 99%

PENTATRAP: a novel cryogenic multi-Penning-trap experiment for high-precision mass measurements on highly charged ions

et al. 2012

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The novel five-Penning trap mass spectrometer Pentatrap is developed at the Max-Planck-Institut für Kernphysik (MPIK), Heidelberg. Ions of interest are long-lived highly charged nuclides up to bare uranium. Pentatrap aims for an accuracy of a few parts in 10 12 for mass ratios of mass doublets. A physics program for Pentatrap includes Q-values measurements of β-transitions relevant for neutrino physics, stringent tests of quantum electrodynamics in the regime of extreme electric fields, and a test of special relativity. Main features of Pentatrap are an access to a source of highly charged ions, a multi-trap configuration, simultaneous measurements of frequencies, a continuous precise monitoring of magnetic field fluctuations, a fast exchange between different ions, and a highly sensitive cryogenic non-destructive detection system. This paper gives a motivation for the new mass spectrometer Pentatrap, presents its experimental setup, and describes the present status.

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Resonant Enhancement of Neutrinoless Double-Electron Capture inGd152

Cited by 96 publications

References 29 publications

Double resonant enhancement in the neutrinoless double-electron capture ofPt190

Double resonant enhancement in the neutrinoless double-electron capture ofPt190

One- and two-pulse quadrupolar excitation schemes of the ion motion in a Penning trap investigated with FT-ICR detection

PENTATRAP: a novel cryogenic multi-Penning-trap experiment for high-precision mass measurements on highly charged ions

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