| 11. |
- Sanchez Lorente, Alicia, et al.
(author)
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Double Λ-hypernuclei at the PANDA experiment
- 2012
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In: Hyperfine Interactions. - : Springer Science and Business Media LLC. - 0304-3843 .- 1572-9540. ; 213:1-3, s. 41-50
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Journal article (peer-reviewed)abstract
- Hypernuclear research will be one of the main topics addressed by the PANDA experiment at FAIR at Darmstadt (Germany). Thanks to the use of stored antiproton beams, copious production of double ΛΛ-Hypernuclei is expected at the PANDA experiment, which will enable high precision gamma spectroscopy of such nuclei for the first time. At PANDA excited states of hypernuclei will be used as a starting point for the formation of double ΛΛ-Hypernuclei. In order to predict the yield of particle-stable double hypernuclei a microcanonical decay model was developed. For the detection of these nuclei, a devoted hypernuclear detector setup is planned. This set-up consists, in addition to the general purpose of the PANDA set-up, of a primary nuclear target for the production of pairs, a secondary active target for the hypernuclei formation and the identification of associated decay products and a germanium array detector to perform gamma spectroscopy. Moreover, one of the most challenging issues of this project is the fact that all detector systems need to operate in the presence of a high magnetic field and a large hadronic background. In these proceedings details concerning the identification procedure of double hypernuclei and the suppression of background will be presented. In addition, the current status of the activities related to the detector developments for this challenging programme will be briefly given.
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| 12. |
- Sanchez Lorente, Alicia, et al.
(author)
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Hypernuclear physics studies of the PANDA experiment at FAIR
- 2014
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In: Hyperfine Interactions. - : IOP Publishing. - 0304-3843 .- 1572-9540. ; 556
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Journal article (peer-reviewed)abstract
- Spin observables provide a powerful tool in understanding the physics. Seven polarisation parameters of the Ω baryon can be extracted from the angular distributions of the hyperon decay and studied with the future PANDA experiment at FAIR. Simulation studies show that strange and single charmed hyperon channels have great prospects with PANDA.
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| 13. |
- Sobkowiak, Adam, et al.
(author)
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A Mössbauer spectroscopy study of polyol synthesized tavorite LiFeSO4F.
- 2014
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In: Hyperfine Interactions. - : Springer Science and Business Media LLC. - 0304-3843 .- 1572-9540. ; 226:1-3, s. 229-236
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Journal article (peer-reviewed)abstract
- The tavorite polymorph of LiFeSO4F has attracted considerable attention as a cathode material for lithium ion batteries due to interesting structural and electrochemical characteristics. For the analysis of such iron-based electrode materials, Mössbauer spectroscopy has become an important and highly useful tool. In this work, we perform a detailed Mössbauer study of pristine tavoriteLiFeSO4F prepared by an optimized synthesis in tetraethylene glycol as reaction media. In contrast to many reported results, we demonstrate the use of an asymmetric fitting model for the inner doublet of the spectrum, which is coupled to the structural properties of the compound. Moreover, we discuss a new approach of ascribing the Fe2 + -doublets to the two distinct crystallographic iron sites of tavorite LiFeSO4F by comparing the Mössbauer signal intensities with the expected f-factors for the corresponding iron atom.
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| 14. |
- Stoehlker, Thomas, et al.
(author)
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SPARC collaboration : new strategy for storage ring physics at FAIR
- 2014
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In: Hyperfine interactions. - : Springer Science and Business Media LLC. - 0304-3843 .- 1572-9540. ; , s. 45-53
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Conference paper (peer-reviewed)abstract
- SPARC collaboration at FAIR pursues the worldwide unique research program by utilizing storage ring and trapping facilities for highly-charged heavy ions. The main focus is laid on the exploration of the physics at strong, ultra-short electromagnetic fields including the fundamental interactions between electrons and heavy nuclei as well as on the experiments at the border between nuclear and atomic physics. Very recently SPARC worked out a realization scheme for experiments with highly-charged heavy-ions at relativistic energies in the High-Energy Storage Ring HESR and at very low-energies at the CRYRING coupled to the present ESR. Both facilities provide unprecedented physics opportunities already at the very early stage of FAIR operation. The installation of CRYRING, dedicated Low-energy Storage Ring (LSR) for FLAIR, may even enable a much earlier realisation of the physics program of FLAIR with slow anti-protons.
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| 15. |
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| 16. |
- Voronin, A. Y., et al.
(author)
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Gravitational states of antihydrogen near material surface
- 2012
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In: Hyperfine Interactions. - : Springer Science and Business Media LLC. - 0304-3843 .- 1572-9540. ; 213:1-3, s. 129-135
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Journal article (peer-reviewed)abstract
- We present a theoretical study of the motion of antihydrogen atoms in the Earth's gravitational field near a material surface. We predict the existence of long-living quasistationary states of antihydrogen in a superposition of the gravitational and Casimir-van der Waals potentials of the surface. We suggest an interferometric method of measuring the energy difference between such gravitational states, hence the gravitational mass of antihydrogen.
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| 17. |
- Voronin, A.Yu., et al.
(author)
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Resonance spectroscopy of gravitational states of antihydrogen
- 2014
-
In: Hyperfine Interactions. - : Springer Science and Business Media LLC. - 0304-3843 .- 1572-9540. ; 228:1-3, s. 133-139
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Journal article (peer-reviewed)abstract
- We study a method to induce resonant transitions between antihydrogen (H) quantum states above a material surface in the gravitational field of the Earth. The method consists in applying a gradient of magnetic field which is temporally oscillating with the frequency equal to a frequency of a transition between gravitational states of antihydrogen. Corresponding resonant change in a spatial density of antihydrogen atoms can be measured as a function of the frequency of applied field. We estimate an accuracy of measuring antihydrogen gravitational states spacing and show how a value of the gravitational mass of the H atom can be deduced from such a measurement.
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| 18. |
- Yao, Ke, et al.
(author)
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Evaporative cooling of hydrogen molecular ions in a Penning trap
- 2014
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In: Hyperfine interactions. - : Springer Science and Business Media LLC. - 0304-3843 .- 1572-9540. ; , s. 191-196
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Conference paper (peer-reviewed)abstract
- Evaporative cooling of singly charged ions in a Penning trap is studied. The ions are created by in-situ electron bombardment of hydrogen molecules and trapped in a cylindrical Penning trap. Cooling of the ions is observed by their axial motion after trapping of a few hundred milliseconds. The ions temperature decreases by a factor of more than 6 in 800 ms, while the bunch density of the coldest ions increases by up to a factor of 10. By studying the time constants of the dependence of ion loss and axial temperature on the magnetic field strength, we exclude the effects of ions loss through the cyclotron motion on the axial ion temperature.
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