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Precision Improvements of Penning Trap Mass Measurements Using Highly Charged Ions: Applications to solving current problems in fundamental physics
Stockholm University, Faculty of Science, Department of 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
Physics
Identifiers
URN: urn:nbn:se:su:diva-616Libris ID: 8553698ISBN: 91-7265-510-0 (print)OAI: oai:DiVA.org:su-616DiVA: diva2:196120
Public defence
2002-09-20, sal FB53, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2002-08-30 Created: 2002-08-30 Last updated: 2017-12-01Bibliographically approved
List of papers
1. SMILETRAP: A Penning trap facility for precision mass measurements using highly charged ions
Open this publication in new window or tab >>SMILETRAP: A Penning trap facility for precision mass measurements using highly charged ions
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2002 In: Nuclear instruments and methods in physics research sect. A, ISSN 0168-9002, Vol. 487, no 3, 618-651 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-23959 (URN)
Note
Part of urn:nbn:se:su:diva-616Available from: 2002-08-30 Created: 2002-08-30Bibliographically approved
2. A new determination of the 4He and 3He masses in a Penning trap
Open this publication in new window or tab >>A new determination of the 4He and 3He masses in a Penning trap
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2001 In: The European physical journal D, ISSN 1434-6060, Vol. 15, no 2, 141-143 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-23960 (URN)
Note
Part of urn:nbn:se:su:diva-616Available from: 2002-08-30 Created: 2002-08-30Bibliographically approved
3. Mass determination of 22Ne, 36Ar, and 86Kr using highly charged ions in a Pening trap
Open this publication in new window or tab >>Mass determination of 22Ne, 36Ar, and 86Kr using highly charged ions in a Pening trap
In: Nuclear Physics AArticle in journal (Refereed) Submitted
Identifiers
urn:nbn:se:su:diva-23961 (URN)
Note
Part of urn:nbn:se:su:diva-616Available from: 2002-08-30 Created: 2002-08-30Bibliographically approved
4. High-precision Mass Measurements of Hydrogen-Like 24Mg11+ and 26Mg11+ ions in a Pening Trap
Open this publication in new window or tab >>High-precision Mass Measurements of Hydrogen-Like 24Mg11+ and 26Mg11+ ions in a Pening Trap
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2002 (English)In: European Physical Journal D: Atomic, Molecular and Optical Physics, ISSN 1434-6060, E-ISSN 1434-6079, Vol. 22, no 1, 41-45 p.Article in journal (Refereed) Accepted
Abstract [en]

For the determination of the bound-electron g factor in hydrogen-like heavy ions the mass of the ion is needed at a relative uncertainty of at least 1 ppb. With the SMILETRAP Penning trap mass spectrometer at the Manne Siegbahn Laboratory in Stockholm several mass measurements of ions with even-even nuclei at this level of precision have been performed so far, exploiting the fact that the mass precision increases linearly with the ion charge. Measurements of masses of the hydrogen-like ions of the two Mg-isotopes 24Mg and 26Mg are reported. The masses of the hydrogen-like ions are 23.979011054(14) u and 25.976562354(34) u, corresponding to the atomic masses 23.985041690(14) u and 25.982592986(34) u, respectively. The possibility to use these two isotopes for the first observation of an isotope effect in the bound-electron g factor in hydrogen-like heavy ions is discussed.

National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-23962 (URN)10.1140/epjd/e2002-00216-x (DOI)
Note
Part of urn:nbn:se:su:diva-616Available from: 2002-08-30 Created: 2002-08-30 Last updated: 2017-12-13Bibliographically approved
5. On the Masses of 28Si and the Proton Determined in a Penning Trap
Open this publication in new window or tab >>On the Masses of 28Si and the Proton Determined in a Penning Trap
2002 In: Physica Scripta, Vol. 66, no 3, 201-207 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-23963 (URN)
Note
Part of urn:nbn:se:su:diva-616Available from: 2002-08-30 Created: 2002-08-30Bibliographically approved
6. Determination of the 76Ge Double Beta Decay Q Value
Open this publication in new window or tab >>Determination of the 76Ge Double Beta Decay Q Value
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2001 In: Physical Review Letters, ISSN 0031-9007, Vol. 86, no 19, 4259-4262 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-23964 (URN)
Note
Part of urn:nbn:se:su:diva-616Available from: 2002-08-30 Created: 2002-08-30Bibliographically approved
7. Determination of the 133Cs and Proton Mass Ratio Using Highly Charged Ions
Open this publication in new window or tab >>Determination of the 133Cs and Proton Mass Ratio Using Highly Charged Ions
1999 In: Physical Review Letters, ISSN 0031-9007, Vol. 83, no 22, 4506-4509 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-23965 (URN)
Note
Part of urn:nbn:se:su:diva-616Available from: 2002-08-30 Created: 2002-08-30Bibliographically approved
8. Shedding light on the Mercury Mass Discrepancy by weighing Hg52+ ions in a Penning trap
Open this publication in new window or tab >>Shedding light on the Mercury Mass Discrepancy by weighing Hg52+ ions in a Penning trap
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2003 (English)In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, 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
Keyword
Atomic masses, 198, 240Hg; Measured masses; Penning trap mass spectrometer; Comparison with previous results
National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-23966 (URN)10.1016/S0375-9474(03)01228-4 (DOI)
Note
Part of urn:nbn:se:su:diva-616Available from: 2002-08-30 Created: 2002-08-30 Last updated: 2017-12-13Bibliographically approved

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