Mass measurements on stable nuclides in the rare-earth region with the Penning-trap mass spectrometer TRIGA-TRAP

Ketelaer, Jens; Audi, G.; Beyer, Thomas; Blaum, Klaus; Block, M.; Cakirli, R. B.; Casten, R. F.; Droese, C.; Dworschak, M.; Eberhardt, Κ.; Eibach, M.; Herfurth, F.; Ramirez, E. Minaya; Nagy, Szilvia; Neidherr, D.; Nörtershäuser, W.; Smorra, Christian; Wang, M.

doi:10.1103/physrevc.84.014311

Cited by 14 publications

(6 citation statements)

References 66 publications

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“…This chain of connections mostly consists of (n, γ) reactions between stable isotopes, measured with uncertainties well below 200 eV, as well as connections between elements based on β-spectroscopy or measurements of mass doublets in mass spectrometers, both with typical uncertainties around 1 keV. Based on this input data, the most precisely reported atomic masses in the range of 140 ≤ A ≤ 180 are those of the gadolinium isotopes 152 to 159, with uncertainties of 1.6 keV -partly on the basis of previous measurements of our group [36]. Our measured atomic masses of 163 Ho and 163 Dy therefore represent the first mass measurements with uncertainties below 1 keV between 136 Xe (ME = −86429.152 (10) keV [37]) and 183 W (ME = −46367.2 (8) keV [38]).…”

Section: Resultsmentioning

confidence: 85%

Preparatory studies for a high-precision Penning-trap measurement of the 163Ho electron capture Q-value

et al. 2015

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The ECHo Collaboration (Electron Capture 163 Ho) aims to investigate the calorimetric spectrum following the electron capture decay of 163 Ho to determine the mass of the electron neutrino. The size of the neutrino mass is reflected in the endpoint region of the spectrum, i.e., the last few eV below the transition energy. To check for systematic uncertainties, an independent determination of this transition energy, the Q-value, is mandatory. Using the TRIGA-TRAP setup, we demonstrate the feasibility of performing this measurement by Penning-trap mass spectrometry. With the currently available, purified 163 Ho sample and an improved laser ablation mini-RFQ ion source, we were able to perform direct mass measurements of 163 Ho and 163 Dy with a sample size of less than 10 17 atoms. The measurements were carried out by determining the ratio of the cyclotron frequencies of the two isotopes to those of carbon cluster ions using the time-of-flight ion cyclotron resonance method. The obtained mass excess values are ME ( 163 Ho) = −66379.3(9) keV and ME ( 163 Dy) = −66381.7(8) keV. In addition, the Q-value was measured for the first time by Penning-trap mass spectrometry to be Q = 2.5(7) keV.

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Section: Resultsmentioning

confidence: 85%

Preparatory studies for a high-precision Penning-trap measurement of the 163Ho electron capture Q-value

et al. 2015

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“…Therefore experimental β-shape factors for 176 Lu have been, until now, unavailable in the literature. Similarly, precise, direct measurements of the Q value of 176 Lu have not been previously reported; an experimental Q value was previously obtained by Ketelaer et al [26] from individual Penning trap measurements of parent and daughter atomic masses, but with an uncertainty of ≈ 11 keV. Hence, a new direct measurement is called for.…”

Section: Introductionmentioning

confidence: 99%

Measurements and computational analysis of the natural decay of Lu176

et al. 2023

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Background: Mainly because of its long half-life and despite its scientific relevance, spectroscopic measurements of 176 Lu forbidden β decays are very limited and lack formulation of shape factors. A direct precise measurement of its Q value is also presently unreported. In addition, the description of forbidden decays provides interesting challenges for nuclear theory. The comparison of precise experimental results with theoretical calculations for these decays can help to test underlying models and can aid the interpretation of data from other experiments. Purpose: Perform the first precision measurements of 176 Lu β-decay spectra and attempt the observation of its electron capture decays, as well as perform the first precision direct measurement of the 176 Lu β-decay Q value. Compare the shape of the precisely determined experimental β spectra to theoretical calculations, and compare the end point energy to that obtained from an independent Q value measurement. Method: The 176 Lu β-decay spectra measurements and the search for electron capture decays were performed with an experimental setup that employed lutetium-containing scintillator crystals and a NaI(Tl) spectrometer for coincidence counting. The β decay Q value was determined via high-precision Penning trap mass spectrometry (PTMS) with the LEBIT facility at the National Superconducting Cyclotron Laboratory. The β-spectrum calculations were performed within the Fermi theory formalism with nuclear structure effects calculated using a shell model approach. Results: Both β transitions of 176 Lu were experimentally observed and corresponding shape factors formulated in their entire energy ranges. The search for electron capture decay branches led to an experimental upper limit of 6.3 × 10 −6 relative to its β decays. The 176 Lu β-decay and electron capture Q values were measured using PTMS to be 1193.0(6) and 108.9(8) keV, respectively. This enabled precise β end point energies of 596.2(6) and 195.3(6) keV to be determined for the primary and secondary β decays, respectively. The conserved vector current hypothesis was applied to calculate the relativistic vector matrix elements. The β-spectrum shape was shown to significantly depend on the Coulomb displacement energy and on the value of the axial vector coupling constant g A , which was extracted according to different assumptions. Conclusion:The implemented self-scintillation method has provided unmatched observations of 176 Lu, independently validated by the first direct measurements of its β-decay Q value by Penning trap mass spectrometry. Theoretical study of the main β transition led to the extraction of very different effective g A and log 10 f values, showing that a high-precision description of this transition would require a realistic nuclear structure with nucleus deformation.

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“…In particular, Penning traps have been known to measure the mass of radioactive nuclei with a precision down to 10 −8 − 10 −9 [2,3,4,5,6]. Many such setups are already in operation [7,8,9,10,11,12,13] or under construction [14,15,16,17], showing both the need for measuring the ground-state properties of exotic nuclei and the success of the Penning trap in doing so. The review presented in [18] overviews recent ion traps and the masses they have allowed to measure.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason most measurement Penning traps used in nuclear physics are preceded by a purification trap to clean the incoming ion bunch. While some systems use an independent magnet for the purification trap [2,9], most second-generation setups have mounted both traps within the same magnet [8,11,13,14,17,19].…”

Section: Introductionmentioning

confidence: 99%

Simulations of the novel double-Penning trap for MLLTRAP: Trapping, cooling and mass measurements

Chauveau

Hauschild²,

Лопез-Мартенс³

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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MLLTRAP is a double Penning trap mass spectrometer that was initially designed to be located at the Maier-Leibnitz-Laboratory (MLL) in Garching (Germany) for high precision mass measurements of exotic nuclei. A second doubletrap assembly, dedicated this time to in-trap α decay spectroscopy, has been developed and is the object of this paper. This assembly can optionally replace the current mass-measurement trap electrode assembly during future spectroscopy campaigns at DESIR/SPIRAL2 in France. Though the previous assembly will be the instrument of choice for high-precision mass measurements, the new double-trap has been designed to be compatible with the ToF-ICR and PI-ICR mass measurement techniques in addition to its initial decay spectroscopy purpose, as it would be a significant operational advantage not to have to switch between assemblies on a regular basis. We have undergone a number of simulations to design this double trap system and estimate its future capabilities. These simulations concern the cooling of ions of interest in the first trap, mass measurements in the second trap and the application of the new Decay and Recoil Imaging (DARING) technique to measure lifetimes of first excited nuclear states populated by α decay. The latter will be described in details in a forthcoming publication and thus the present contribution should be considered as "part one" of a two-part article on the design and simulation of the upcoming double-trap system for MLLTRAP. While the cooling and measurement techniques presented in this contribution have been extensively described and simulated in the past, this specific double-trap has a unique geometry, as the central electrode of the second trap has been replaced by a cubic arrangement of four Si-strip detectors. We study here the expected impact of this geometry on the mass measurement capabilities of the future trap.

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Mass measurements on stable nuclides in the rare-earth region with the Penning-trap mass spectrometer TRIGA-TRAP

Cited by 14 publications

References 66 publications

Preparatory studies for a high-precision Penning-trap measurement of the 163Ho electron capture Q-value

Preparatory studies for a high-precision Penning-trap measurement of the 163Ho electron capture Q-value

Measurements and computational analysis of the natural decay of Lu176

Simulations of the novel double-Penning trap for MLLTRAP: Trapping, cooling and mass measurements

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