Atomic masses of intermediate-mass neutron-deficient nuclei with relative uncertainty down to 35-ppb via multireflection time-of-flight mass spectrograph

Abstract

High-precision mass measurements of ${}^{63}$Cu, ${}^{64-66}$Zn, ${}^{65}$Ga, ${}^{65-67}$Ge, ${}^{67}$As, ${}^{78,81}$Br, ${}^{80}$Rb, and ${}^{79}$Sr were performed utilizing a multireflection time-of-flight mass spectrograph combined with the gas-filled recoil ion separator GARIS-II. In the case of ${}^{65}$Ga, a mass uncertainty of 2.1 keV, corresponding to a relative precision of $\delta m/m=3.5\times 10^{-8}$, was obtained and the mass value is in excellent agreement with the 2016 Atomic Mass Evaluation. For ${}^{67}$Ge and ${}^{81}$Br, where masses were previously deduced through indirect measurements, discrepancies with literature values were found. The feasibility of using this device for mass measurements of nuclides more neutron-deficient side, which have significant impact on the $rp$-process pathway, is discussed.

arXiv comment15 pages, 6 figures, 1 table

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Cited by in corpus (6)

• High-resolution, accurate MR-TOF-MS for short-lived, exotic nuclei of few events in their ground and low-lying isomeric states
• Mass measurements of As, Se and Br nuclei and their implication on the proton-neutron interaction strength towards the N=Z line
• Improving wide-band mass measurements in a multi-reflection time-of-flight mass spectrograph by usage of a concomitant measurement scheme
• Development of an "$\alpha$-ToF" detector for correlated measurement of atomic masses and decay properties
• Reduction of contaminants originating from primary beam by improving the beam stoppers in GARIS-II
• Accurately accounting for effects on times-of-flight caused by finite field-transition times during the ejection of ions from a storage trap: A study for TOF and MRTOF mass spectrometry