Shedding light on the Mercury Mass Discrepancy by weighing Hg52+ ions in a Penning trap
2003 (English)In: Nuclear Physics A, ISSN 0375-9474, Vol. 723, no 1-2, 3-16 p.Article in journal (Refereed) Published
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.
Atomic masses, 198, 240Hg; Measured masses; Penning trap mass spectrometer; Comparison with previous results
IdentifiersURN: urn:nbn:se:su:diva-23966DOI: 10.1016/S0375-9474(03)01228-4OAI: oai:DiVA.org:su-23966DiVA: diva2:196119
Part of urn:nbn:se:su:diva-6162002-08-302002-08-302010-09-14Bibliographically approved