A high-performance multiple-reflection time-of-flight mass spectrometer and isobar separator for the research with exotic nuclei

Dickel, T.; Becker, Anna; Czok, U.; Geißel, H.; Haettner, E.; Jesch, C.; Kinsel, Wadim; Petrick, Martin; Scheidenberger, C.; Simón, Adolfo; Yavor, M.I.

doi:10.1016/j.nima.2014.12.094

Cited by 132 publications

(81 citation statements)

References 62 publications

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“…The 1.8/2.0(EM) interaction [48][49][50] combines an SRG-evolved [51] next-to-next-to-next-to-leading order (N3LO) chiral NN potential [52] with a next-tonext-to-leading order (N2LO) non-renormalized chiral 3N force. The N 2 LO sat interaction [53] has NN and 3N terms fitted simultaneously to properties of A = 2, 3, 4 nuclei as well as to selected systems up to 24 O. The NN+3N(lnl), applied for the first time in this paper, is a variant of the NN+3N(400) interaction [54].…”

Section: T a N -M P E T T I T A N -M R -T O F -M S M E ( T I T A N -mentioning

confidence: 99%

Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes

Leistenschneider¹,

Reiter²,

Andrés³

et al. 2018

Phys. Rev. Lett.

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108

129

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A precision mass investigation of the neutron-rich titanium isotopes 51−55 Ti was performed at TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). The range of the measurements covers the N = 32 shell closure and the overall uncertainties of the 52−55 Ti mass values were significantly reduced. Our results conclusively establish the existence of weak shell effect at N = 32, narrowing down the abrupt onset of this shell closure. Our data were compared with state-of-the-art ab initio shell model calculations which, despite very successfully describing where the N = 32 shell gap is strong, overpredict its strength and extent in titanium and heavier isotones. These measurements also represent the first scientific results of TITAN using the newly commissioned Multiple-Reflection Time-of-Flight Mass Spectrometer (MR-TOF-MS), substantiated by independent measurements from TITAN's Penning trap mass spectrometer.Atomic nuclei are highly complex quantum objects made of protons and neutrons. Despite the arduous efforts needed to disentangle specific effects from their many-body nature, the fine understanding of their structures provides key information to our knowledge of fundamental nuclear forces. One notable quantum behavior of bound nuclear matter is the formation of shell-like structures for each fermion group [1], as electrons do in atoms. Unlike for atomic shells, however, nuclear shells are known to vanish or move altogether as the number of protons or neutrons in the system changes [2]. Particular attention has been given to the emergence of strong shell effects among nuclides with 32 neutrons, pictured in a shell model framework as a full valence ν2p 3/2 orbital. Across most of the known nuclear chart, this orbital is energetically close to ν1f 5/2 , which prevents the appearance of shell signatures in energy observables. However, the excitation energies of the lowest 2 + states show a relative, but systematic, local increase below proton number Z = 24 [3]. This effect, characteristic of shell closures, has been attributed in shell model calculations to the weakening of attractive proton-neutron interactions between the ν1f 5/2 and π1f 7/2 orbitals as the latter empties, making the neutrons in the former orbital less bound [4,5]. Ab initio calculations are also extending their reach over this sector of the nuclear chart, yet no systematic investigation of the N = 32 isotones has been produced so far.

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Section: T a N -M P E T T I T A N -M R -T O F -M S M E ( T I T A N -mentioning

confidence: 99%

Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes

Leistenschneider¹,

Reiter²,

Andrés³

et al. 2018

Phys. Rev. Lett.

Self Cite

108

129

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“…Likewise, t = t − t r is the difference in TOF of the considered ion from the reference ion. After a reflection in the MR TOF, ion properties can be expressed as [10] x =(x|x)x 0 + (x|a)a 0 + (x|xδ)x 0 δ + (x|aδ)a 0 δ + ...…”

Section: The Multi-reflection Time-of-flight Mass-spectrometermentioning

confidence: 99%

Design of a multiple-reflection time-of-flight mass spectrometer for barium-tagging

Murray¹,

Dilling²,

Gornea³

et al. 2019

Hyperfine Interact

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The search for neutrinoless double beta decay requires increasingly advanced methods of background reduction. A bold approach to solving this problem, in experiments using 136 Xe, is to extract and identify the daughter 136 Ba ion produced by double beta decay. Tagging events in this manner allows for a virtually background-free verification of double beta decay signals. Various approaches are being pursued by the nEXO collaboration to achieve Ba-tagging. A Multi-Reflection Time-of-Flight Mass Spectrometer (MR TOF) has been designed and optimized as one of the ion-identification methods, where it will investigate the ion-extraction efficiency, as well as provide further identification of the Ba isotope. The envisioned mode of operation allows the MR TOF to achieve a quickly adjustable mass-range and resolution, with simulations suggesting that a massresolving power of 140,000 is within reach. This work will discuss the MR TOF design and the methods employed to simulate and optimize it.

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“…The mirror field is optimized to provide an isochronous ion motion in the X-direction and spatial ion focusing in the Y-direction, while providing the aberration limit of analyzer resolution exceeding one million [38,44,65]. Comparable resolution is theoretically predicted and is experimentally achieved in trapping coaxial MR-TOF employed in nuclear physics research [111,112].…”

Section: R < (δK/k)*(l*v)/(δ X*δ V)/4mentioning

confidence: 99%

Multiplexing in Multi-Reflecting TOF MS

Verenchikov¹,

Kirillov²,

Khasin³

et al. 2016

J. Appl. Sol. Chem. Model.

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The paper presents an overview of original inventions, development and experimental results by the group of authors in the area of multi-reflecting time-of-flight mass spectrometry with Folded Flight Path (FFP ® ) (MR-TOFMS) with main focus on multiplexing methods for improving the analysis throughput, i.e. the amount of information per time unit. MR-TOF provides panoramic spectra (virtue of TOFMS), while significantly enhancing resolving power, thus, providing yet more information. Resolving power R=500,000 is demonstrated to resolve isobars and to improve mass accuracy to sub-ppm level. Encoded Frequent Pulsing (EFP TM ) method improves sensitivity, expands dynamic range and opens multiple incarnations of parallel and fast tandem methods of analysis based on using ion traps, TOFMS and ion mobility for rapid and lossless parent ion separations.

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A high-performance multiple-reflection time-of-flight mass spectrometer and isobar separator for the research with exotic nuclei

Cited by 132 publications

References 62 publications

Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes

Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes

Design of a multiple-reflection time-of-flight mass spectrometer for barium-tagging

Multiplexing in Multi-Reflecting TOF MS

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