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Shedding light on the Mercury Mass Discrepancy by weighing Hg52+ ions in a Penning trap
Stockholm University, Faculty of Science, Department of Physics.
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2003 (English)In: Nuclear Physics A, ISSN 0375-9474, Vol. 723, no 1-2, 3-16 p.Article in journal (Refereed) Published
Abstract [en]

In their nuclear tables Audi and Wapstra have pointed out a serious mass discrepancy between their extrapolated values for the mercury isotopes and those from a direct measurement by the Manitoba group. The values deviate by as much as 85 ppb from each other with claimed uncertainties of about 16 and 7 ppb, respectively. In order to decide which values are correct the masses of the 198Hg and 204Hg isotopes have been measured in the Stockholm Penning trap mass spectrometer SMILETRAP using 52+ ions. This charge state corresponds to a filled Ni electron configuration for which the electron binding energy can be accurately calculated. The mass values obtained are 197.966 768 44(43) u for 198Hg and 203.973 494 10(39) u for 204Hg. These values agree with those measured by the Manitoba group, with a 3 times lower uncertainty. This measurement was made possible through the implementation of a cooling technique of the highly charged mercury ions during charge breeding in the electron beam ion source used for producing the Hg52+ ions.

Place, publisher, year, edition, pages
Elsevier Science B.V. , 2003. Vol. 723, no 1-2, 3-16 p.
Keyword [en]
Atomic masses, 198, 240Hg; Measured masses; Penning trap mass spectrometer; Comparison with previous results
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-23966DOI: 10.1016/S0375-9474(03)01228-4OAI: diva2:196119
Part of urn:nbn:se:su:diva-616Available from: 2002-08-30 Created: 2002-08-30 Last updated: 2010-09-14Bibliographically approved
In thesis
1. Precision Improvements of Penning Trap Mass Measurements Using Highly Charged Ions: Applications to solving current problems in fundamental physics
Open this publication in new window or tab >>Precision Improvements of Penning Trap Mass Measurements Using Highly Charged Ions: Applications to solving current problems in fundamental physics
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In my thesis I describe the improvements of the Penning trap mass spectrometer SMILETRAP. The objective of these improvements have been to increase the reliability and the accuracy with which an atomic mass can be measured using highly charged ions. The improvements have been achieved by stabilizing both the electric and magnetic fields of the trap and by improving the technical performance of the trap system. As a result it has been possible to measure accurately the mass of several atoms ranging from hydrogen to mercury using charge states from 1+ to 52+. It was only possible to use the highest charge states after applying a successful cooling of these ions with Helium during the charge breeding.

The technical improvements made a number of interesting accurate mass measurements possible. The measurements of the 3H, 3He, and 4He masses showed that the previously values were wrong. The mass difference between 3H and 3He which is the Q-value of the tritium beta decay has been determined to 18.588(3) keV. The Q-value of the double β-decay of 76Ge was measured at an accuracy of 50 eV. This value is indispensable for the evaluation the Heidelberg-Moscow experiment which aims at finding a possible neutrino-less decay which if present would be a violation of the standard model. The mass ratio of mCs/mp is used to determine the fine structure constant independent of QED calculations. The two decades old anomaly in the mass values of Hg was solved by the mass determination of 198Hg and 204Hg. The mass of 24Mg was measured at an uncertatinty of 0.6 ppb and will be used in the determination of the g-factor of a bound electron in a hydrogen like ions.

Place, publisher, year, edition, pages
Stockholm: Fysikum, 2002. 61 p.
National Category
Atom and Molecular Physics and Optics
Research subject
urn:nbn:se:su:diva-616 (URN)91-7265-510-0 (ISBN)
Public defence
2002-09-20, sal FB53, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Available from: 2002-08-30 Created: 2002-08-30 Last updated: 2009-12-15Bibliographically approved

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