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| 2. |
- Fritioff, Tomas, et al.
(författare)
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Precise measurements of ionic masses for QED tests
- 2006
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Ingår i: International Journal of Mass Spectrometry. - : Elsevier BV. - 1387-3806 .- 1873-2798. ; 251:2-3, s. 281-285
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Tidskriftsartikel (refereegranskat)abstract
- The Penning trap mass spectrometer SMILETRAP is designed for precision mass measurements using the merits of highly charged ions. In this paper we describe the feature of SMILETRAP and give examples of mass measurements involving , , and ions. These emphasize the importance of accurate masses of hydrogen-like and lithium-like ions that are required in the evaluation of g-factor measurements of electrons bound to even–even nuclei and test of QED effects. Highly precise mass measurements can also be used for testing atomic structure calculations and determining atomic binding energies. Relevance of such measurements throughout the periodic system is discussed.
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| 3. |
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| 4. |
- Schuch, Reinhold, et al.
(författare)
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Q value related mass determinations using a Penning trap
- 2007
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Ingår i: Hyperfine Interactions. - Nederländerna : Springer. - 0304-3843 .- 1572-9540. ; 173:1-3, s. 73-83
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Tidskriftsartikel (refereegranskat)abstract
- We report here about measurements of reaction and decay Q values by precise determination of pairs of atomic masses. These were performed with the Penning trap mass spectrometer SMILETRAP. Measurements with Penning traps give reliable and accurate masses, in particular Q values, due to the fact that certain systematic errors to a great deal cancel in the mass difference between the two atoms defining the Q value. Some Q values that are of fundamental interest will be discussed here, for example, a new Q value for the 6Li (n,γ) 7Li reaction, for the β-decay of tritium, related to properties of the electron neutrino mass, and for the neutrino-less double β-decay of 76Ge, related to the question of whether the neutrino is a Majorana particle or not. In case of the latter two we report the most accurate Q values, namely 18,589.8(12) eV for the tritium decay and 2,038.997(46) keV for the neutrino-less double β-decay of 76Ge.
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| 5. |
- Solders, Andreas, et al.
(författare)
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Determination of the proton mass from a measurement of the cyclotron frequencies of D+ and H2+ in a Penning trap
- 2008
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Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - Maryland, USA : American Physical Society. - 1050-2947 .- 1094-1622. ; 78:1, s. 2514-2520
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Tidskriftsartikel (refereegranskat)abstract
- We determine the cyclotron frequency ratio of H2+ and D+, applying the two-pulse Ramsey-excitation technique in the Penning-trap mass spectrometer SMILETRAP. The final result, based on probing more than 100 000 ions, is a frequency ratio of 0.999 231 659 33(17). Using a value of the D+ mass recently measured by the Seattle group, we obtain so far the most precise experimental H2+ mass value of 2.015 101 497 16(34) u. From this value a proton mass value of 1.007 276 466 95(18) u (0.18 ppb relative uncertainty) could be derived, in good agreement with the value of 1.007 276 466 89(14) u published by Van Dyck et al.
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| 6. |
- Suhonen, Markus, 1972-, et al.
(författare)
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High-frequency Ramsey excitation in a Penning trap
- 2007
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Ingår i: Journal of Instrumentation. - England/Italien : IOP, SISSA. - 1748-0221. ; 2:P06003, s. 1-14
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Tidskriftsartikel (refereegranskat)abstract
- The Ramsey excitation method for high-precision mass-measurements of highly-charged ions has been investigated and benchmarked using H2+ ions in the Penning-trap mass-spectrometer SMILETRAP. The reason for using H2+ ions are their high cyclotron frequency which is typical for the highly-charged ions usually used at SMILETRAP. Two-, three- and four-pulse Ramsey excitation data are analyzed with the help of recent theoretical work and are compared with the previously used single-pulse excitation data. An improvement factor of 2.9 in the statistical uncertainty is achieved. Furthermore the mass of 76Se, included in the previous Q-value measurement of the 76Ge neutrinoless double beta decay, is checked using 76Se25+ ions and a three-pulse Ramsey excitation. The results show a convincing agreement with the measurement when using single-pulse excitation and therefore our Q-value of 2039.006(50) keV, performed with single-pulse excitation, is confirmed.
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