Breakdown of the Isobaric Multiplet Mass Equation atA=33,T=3/2

Abstract

Mass measurements on (33,34,42,43)Ar were performed using the Penning trap mass spectrometer ISOLTRAP and a newly constructed linear Paul trap. This arrangement allowed us, for the first time, to extend Penning trap mass measurements to nuclides with half-lives below one second ( 33Ar: T(1/2) = 174 ms). A mass accuracy of about 10(-7) (deltam approximately 4 keV) was achieved for all investigated nuclides. The isobaric multiplet mass equation was checked for the A = 33, T = 3/2 quartet and found to be inconsistent with the generally accepted quadratic form.

High-precision mass measurement ofS31with the double Penning trap JYFLTRAP improves the mass value forClKankainen1, Eronen2, Gorelov3 et al. 2010Phys. Rev. C531220View full textAdd to dashboardCite

“…If the 32 Ar value was about 3σ (5.4 keV) higher, the quadratic fit with the data set E would yield a χ 2 /n = 1.7. The remeasurements of argon isotopes at ISOLTRAP have changed the mass excess values for 33 Ar [42,47] by −2.2 keV and for 34 Ar [47,48] by 1.3 keV, respectively. To confirm the breakdown of the IMME, a new mass measurement of 32 Ar would be desirable.…”

Atomic physics experiments with trapped and cooled highly charged ions

“…An even better accuracy of about 10 −11 was obtained at MIT by Pritchard et al [25] with a mass spectrometer now at Florida State University [26]. The masses of singly charged radionuclides have been measured with an accuracy in the range of 10 −7 to 10 −8 and better by Penning trap mass spectrometers installed at ISOLDE/CERN [27], Argonne [28], Jyväskylä [29], MSU [30], and GSI [31]. HCI for mass spectrometry will be used at TITAN at ISAC/TRIUMF, Vancouver [32], LEBIT/MSU [33], HITRAP/GSI [34], ISOLTRAP/ISOLDE [35], MAFFTRAP/Munich [36], and at MATS/Darmstadt [5].…”

Chapter 7 HITRAP: A Facility at GSI for Highly Charged Ions

“…Pritchard et al [25] at MIT even had a mass spectrometer, which is now at Florida State University [26], with an accuracy of about 10 −11 . The masses of singly charged radionuclides have been measured with an accuracy of 10 −7 to 10 −8 and better, by Penning trap mass spectrometers installed at ISOLDE/CERN [27,28], Argonne [29], Jyväskylä [30], MSU [31], and GSI [32]. Highly charged ions for mass spectrometry will be used at TITAN at ISAC/TRIUMF, Vancouver [33], LEBIT/MSU [34], HITRAP/GSI [35], ISOLTRAP/ISOLDE [36], MAFFTRAP/Munich [37], and at MATS/GSI [19].…”