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Suhonen, Markus
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Publications (8 of 8) Show all publications
Liu, Y., Hobein, M., Solders, A., Suhonen, M. & Schuch, R. (2010). Improved temperature regulation of Penning trap mass spectrometers. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 294(1), 28-32
Open this publication in new window or tab >>Improved temperature regulation of Penning trap mass spectrometers
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2010 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 294, no 1, p. 28-32Article in journal (Refereed) Published
Abstract [en]

In order to reach relative uncertainties in mass measurements with Penning traps of 10-10 or better, the temperature variation of the trap and surrounding materials must be kept below 10 mK. Temperature variations induce a shift in the measured ion cyclotron frequency because of non-zero, temperature dependent magnetic susceptibilities of the construction materials. In this paper we report of a new temperature regulation system recently installed at SMILETRAP II that manages to keep the temperature fixed at the set point with a standard deviation of only 2.6 mK. −10 or better, the temperature variation of the trap and surrounding.

Keywords
Penning trap, Magnetic field, Stabilization, Precision mass spectrometry, Temperature regulation
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-218625 (URN)10.1016/j.ijms.2010.04.008 (DOI)000279462700005 ()
Available from: 2009-08-26 Created: 2014-02-13 Last updated: 2017-12-06Bibliographically approved
Rodriguez, D., Blaum, K., Noertershaeuser, W., Ahammed, M., Algora, A., Audi, G., . . . Ziegler, F. (2010). MATS and LaSpec: High-precision experiments using ion traps and lasers at FAIR. The European Physical Journal Special Topics, 183, 1-123
Open this publication in new window or tab >>MATS and LaSpec: High-precision experiments using ion traps and lasers at FAIR
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2010 (English)In: The European Physical Journal Special Topics, ISSN 1951-6355, E-ISSN 1951-6401, Vol. 183, p. 1-123Article, review/survey (Refereed) Published
Abstract [en]

Nuclear ground state properties including mass, charge radii, spins and moments can be determined by applying atomic physics techniques such as Penning-trap based mass spectrometry and laser spectroscopy. The MATS and LaSpec setups at the low-energy beamline at FAIR will allow us to extend the knowledge of these properties further into the region far from stability. The mass and its inherent connection with the nuclear binding energy is a fundamental property of a nuclide, a unique ""fingerprint"". Thus, precise mass values are important for a variety of applications, ranging from nuclear-structure studies like the investigation of shell closures and the onset of deformation, tests of nuclear mass models and mass formulas, to tests of the weak interaction and of the Standard Model. The required relative accuracy ranges from 10(-5) to below 10(-8) for radionuclides, which most often have half-lives well below 1 s. Substantial progress in Penning trap mass spectrometry has made this method a prime choice for precision measurements on rare isotopes. The technique has the potential to provide high accuracy and sensitivity even for very short-lived nuclides. Furthermore, ion traps can be used for precision decay studies and offer advantages over existing methods. With MATS (Precision Measurements of very short-lived nuclei using an Advanced Trapping System for highly-charged ions) at FAIR we aim to apply several techniques to very short-lived radionuclides: High-accuracy mass measurements, in-trap conversion electron and alpha spectroscopy, and trap-assisted spectroscopy. The experimental setup of MATS is a unique combination of an electron beam ion trap for charge breeding, ion traps for beam preparation, and a high-precision Penning trap system for mass measurements and decay studies. For the mass measurements, MATS offers both a high accuracy and a high sensitivity. A relative mass uncertainty of 10(-9) can be reached by employing highly-charged ions and a non-destructive Fourier-Transform Ion-Cyclotron-Resonance (FT-ICR) detection technique on single stored ions. This accuracy limit is important for fundamental interaction tests, but also allows for the study of the fine structure of the nuclear mass surface with unprecedented accuracy, whenever required. The use of the FT-ICR technique provides true single ion sensitivity. This is essential to access isotopes that are produced with minimum rates which are very often the most interesting ones. Instead of pushing for highest accuracy, the high charge state of the ions can also be used to reduce the storage time of the ions, hence making measurements on even shorter-lived isotopes possible. Decay studies in ion traps will become possible with MATS. Novel spectroscopic tools for in-trap high-resolution conversion-electron and charged-particle spectroscopy from carrier-free sources will be developed, aiming e. g. at the measurements of quadrupole moments and E0 strengths. With the possibility of both high-accuracy mass measurements of the shortest-lived isotopes and decay studies, the high sensitivity and accuracy potential of MATS is ideally suited for the study of very exotic nuclides that will only be produced at the FAIR facility. Laser spectroscopy of radioactive isotopes and isomers is an efficient and model-independent approach for the determination of nuclear ground and isomeric state properties. Hyperfine structures and isotope shifts in electronic transitions exhibit readily accessible information on the nuclear spin, magnetic dipole and electric quadrupole moments as well as root-mean-square charge radii. The dependencies of the hyperfine splitting and isotope shift on the nuclear moments and mean square nuclear charge radii are well known and the theoretical framework for the extraction of nuclear parameters is well established. These extracted parameters provide fundamental information on the structure of nuclei at the limits of stability. Vital information on both bulk and valence nuclear properties are derived and an exceptional sensitivity to changes in nuclear deformation is achieved. Laser spectroscopy provides the only mechanism for such studies in exotic systems and uniquely facilitates these studies in a model-independent manner. The accuracy of laser-spectroscopic-determined nuclear properties is very high. Requirements concerning production rates are moderate; collinear spectroscopy has been performed with production rates as few as 100 ions per second and laser-desorption resonance ionization mass spectroscopy (combined with beta-delayed neutron detection) has been achieved with rates of only a few atoms per second. This Technical Design Report describes a new Penning trap mass spectrometry setup as well as a number of complementary experimental devices for laser spectroscopy, which will provide a complete system with respect to the physics and isotopes that can be studied. Since MATS and LaSpec require high-quality low-energy beams, the two collaborations have a common beamline to stop the radioactive beam of in-flight produced isotopes and prepare them in a suitable way for transfer to the MATS and LaSpec setups, respectively.

National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-218632 (URN)10.1140/epjst/e2010-01231-2 (DOI)000280061400001 ()
Note

authorCount :105

Available from: 2010-12-10 Created: 2014-02-13 Last updated: 2017-12-06Bibliographically approved
Solders, A., Bergström, I., Nagy, S., Suhonen, M. & Schuch, R. (2008). Determination of the proton mass from a measurement of the cyclotron frequencies of D+ and H2+ in a Penning trap. Physical Review A. Atomic, Molecular, and Optical Physics, 78(1), 2514-2520
Open this publication in new window or tab >>Determination of the proton mass from a measurement of the cyclotron frequencies of D+ and H2+ in a Penning trap
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2008 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 78, no 1, p. 2514-2520Article in journal (Refereed) Published
Abstract [en]

Wedetermine the cyclotron frequency ratio of H2+ and D+, applyingthe 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 ofthe D+ mass recently measured by the Seattle group, weobtain so far the most precise experimental H2+ mass valueof 2.015 101 497 16(34) u. From this value a proton mass valueof 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 publishedby Van Dyck et al.

Place, publisher, year, edition, pages
Maryland, USA: American Physical Society, 2008
Keywords
atomic mass, deuterium, hydrogen ions, mass spectra, mass spectroscopy, particle traps, protons
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-218626 (URN)10.1103/PhysRevA.78.012514 (DOI)000258180300118 ()
Available from: 2009-08-26 Created: 2014-02-13 Last updated: 2017-12-06Bibliographically approved
Schuch, R., Bergström, I., Fritioff, T., Solders, A., Suhonen, M. & Nagy, S. (2008). Precise Atomic Masses for Fundamental Physics Determined at SMILETRAP. Advances in Quantum Chemistry, 53, 67-81
Open this publication in new window or tab >>Precise Atomic Masses for Fundamental Physics Determined at SMILETRAP
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2008 (English)In: Advances in Quantum Chemistry, ISSN 0065-3276, E-ISSN 2162-8815, Vol. 53, p. 67-81Article in journal (Refereed) Published
Abstract [en]

In this paper we describe the features of the SMILETRAP Penning trap mass spectrometer and give examples of recently performed precision mass measurements. SMILETRAP is designed for precision mass measurements using the merits of highly-charged ions. We emphasize here the importance of accurate masses of hydrogen-like and lithium-like ions for the evaluation of g-factor measurements of electrons bound to even–even nuclei and test quantum electrodynamics (QED). For these experiments the ion masses of 40Ca17+ and 40Ca19+ were measured at SMILETRAP with 5×10−10 precision. Highly precise mass measurements can also be used for testing atomic structure calculations and determination of atomic and nuclear binding energies. Some Q-values are of fundamental interest, for example, the beta-decay of tritium and the double beta-decay with no neutrinos of several nuclei, in particular 76Ge. These decays are related to properties of the electron neutrino mass and whether this neutrino is a Majorana particle. The reason that Penning traps are so reliable for the determinations of accurate decay Q-values is due to the fact that systematic errors to a great deal cancel in the mass difference between the two atoms defining the Q-value. In this paper we report the most accurate Q-values of these two beta decays namely 18589.8(12) eV for the tritium decay, and 2038.997(46) keV for the neutrinoless double beta-decay of 76Ge.

Place, publisher, year, edition, pages
Nederländerna: Elsevier, 2008
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-218627 (URN)10.1016/S0065-3276(07)53006-6 (DOI)000251354200006 ()
Available from: 2009-08-25 Created: 2014-02-13 Last updated: 2017-12-06Bibliographically approved
Suhonen, M., Bergström, I., Fritioff, T., Nagy, S., Solders, A. & Schuch, R. (2007). High-frequency Ramsey excitation in a Penning trap. Journal of Instrumentation, 2(P06003), 1-14
Open this publication in new window or tab >>High-frequency Ramsey excitation in a Penning trap
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2007 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 2, no P06003, p. 1-14Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
England/Italien: IOP, SISSA, 2007
Keywords
Mass spectrometers, Instrumentation and methods for time-of-flight (TOF) spectroscopy, Analysis and statistical methods
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-218629 (URN)10.1088/1748-0221/2/06/P06003 (DOI)000253651600003 ()
Available from: 2009-08-25 Created: 2014-02-13 Last updated: 2017-12-06Bibliographically approved
Schuch, R., Bergström, I., Blaum, K., Fritioff, T., Solders, A., Suhonen, M. & Nagy, S. (2007). Q value related mass determinations using a Penning trap. Hyperfine Interactions, 173(1-3), 73-83
Open this publication in new window or tab >>Q value related mass determinations using a Penning trap
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2007 (English)In: Hyperfine Interactions, ISSN 0304-3843, E-ISSN 1572-9540, Vol. 173, no 1-3, p. 73-83Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Nederländerna: Springer, 2007
Keywords
Penning trap, Precision mass determinations, Q value, SMILETRAP
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-218628 (URN)10.1007/s10751-007-9545-0 (DOI)
Available from: 2009-08-25 Created: 2014-02-13 Last updated: 2017-12-06Bibliographically approved
Fritioff, T., Bergström, I., Nagy, S., Solders, A., Suhonen, M. & Schuch, R. (2006). Precise measurements of ionic masses for QED tests. International Journal of Mass Spectrometry, 251(2-3), 281-285
Open this publication in new window or tab >>Precise measurements of ionic masses for QED tests
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2006 (English)In: International Journal of Mass Spectrometry, ISSN 1387-3806, E-ISSN 1873-2798, Vol. 251, no 2-3, p. 281-285Article in journal (Refereed) Published
Abstract [en]

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.

Keywords
g-Factor; Penning trap; Lamor precision frequency; Isotopes; QED
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-218630 (URN)10.1016/j.ijms.2006.02.008 (DOI)
Available from: 2008-01-15 Created: 2014-02-13 Last updated: 2017-12-06Bibliographically approved
Suhonen, M., Hobein, M., Liu, Y., Solders, A. & Schuch, R.First observation of evaporative cooling of highly charged ions in a Penning trap resolved by their coherent axial oscillations.
Open this publication in new window or tab >>First observation of evaporative cooling of highly charged ions in a Penning trap resolved by their coherent axial oscillations
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

We have trapped and stored Ar16+ ions in a cylindrical Penning trap and managed to evaporatively cool the ion clouds axial motion to thermal temperature. The stored ion cloud is excited axially by fast switching of the trap potentials whereafter the cloud starts to oscillate coherently. The cooling is observed from the time of flight resolved peaks originating from the oscillations while lowering the trap potential slowly. The peaks widths decrease with increased storage time.

Keywords
Penning Traps, TOF spectroscopy
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-218624 (URN)
Available from: 2009-08-26 Created: 2014-02-13 Last updated: 2017-01-25Bibliographically approved

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