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Sirghi D.L.,National Institute of Nuclear Physics, Italy | Bazzi M.,National Institute of Nuclear Physics, Italy | Beer G.,University of Victoria | Bombelli L.,Politechno di Milan | And 34 more authors.
International Journal of Modern Physics A | Year: 2011

The SIDDHARTA experiment (SIlicon Drift Detector for Hadronic Atom Research by Timing Application) had the aim to perform kaonic atoms X-ray transitions measurements, to better understand aspects of the low-energy QCD in the strangeness sector. The experiment combined the excellent low-energy kaon beam generated at DAΦNE, allowing to use gaseous targets, with excellent fast X-rays detectors: Silicon Drift Detectors. SIDDHARTA was installed on DAΦNE in autumn 2008 and took data till late 2009. Apart of the kaonic hydrogen and kaonic deuterium measurements, we have performed the kaonic helium transitions to the 2p level (L-lines) measurements: for the first time in a gaseous target for helium4 and for the first time ever for kaonic helium3. The interest for such type of measurement was rather high, being it triggered by two reasons: the so-called "kaonic helium puzzle" (even if this was solved by KEK-PS E570 experiment, but a cross-check was useful) and some theoretical predictions of possible high energy shift (at the level of 10 eV). In this paper the preliminary results for the measurements to the 2p level (L-series) for kaonic helium4 and kaonic helium3 are presented. © 2011 World Scientific Publishing Company.


Bazzi M.,National Institute of Nuclear Physics, Italy | Beer G.,University of Victoria | Bombelli L.,Politechno di Milan | Bragadireanu A.M.,National Institute of Nuclear Physics, Italy | And 34 more authors.
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2011

Large-area silicon drift detectors (SDDs) were used for the first time in the background condition of a collider for precision spectroscopy of the kaonic atom X-rays in the SIDDHARTA experiment for the study of the strong interaction in a low-energy regime. The measurements were performed at the DAΦNE electronpositron collider (LNF, Italy), using gas targets of hydrogen, deuterium, helium-3, and helium-4. A test measurement using the kaonic 4He X-rays showed an excellent performance of the SDD devices under the beam conditions, and a good background suppression capability using the time correlation between the kaonic atom X-rays and the back-to-back correlated KK- pairs produced by φ decays. © 2010 Elsevier B.V. All rights reserved.


Okada S.,National Institute of Nuclear Physics, Italy | Bazzi M.,National Institute of Nuclear Physics, Italy | Beer G.,University of Victoria | Bombelli L.,Politechno di Milan | And 34 more authors.
EPJ Web of Conferences | Year: 2010

The SIDDHARTA experiment aims at a precise measurement of K-series kaonic hydrogen x-rays and the first-ever measurement of the kaonic deuterium x-rays to determine the strong-interaction energy-level shift and width of the lowest lying atomic states. These measurements offer a unique possibility to precisely determine the isospin-dependent K¯-nucleon scattering lengths. © Owned by the authors, published by EDP Sciences, 2010.


Ishiwatari T.,Stefan Meyer Institute For Subatomare Physik | Bazzi M.,National Institute of Nuclear Physics, Italy | Beer G.,University of Victoria | Bombelli L.,Politechno di Milan | And 32 more authors.
Nuclear Physics A | Year: 2013

The kaonic 3He and 4He 3d → 2p transitions in gaseous targets were observed by the SIDDHARTA experiment. The X-ray energies of these transitions were measured with large-area silicon-drift detectors using the timing information of the K +K - pairs produced by the DAΦNE e +e - collider. The strong-interaction shifts and widths both of the kaonic 3He and 4He 2p states were determined, which are much smaller than the results obtained by the previous experiments. The "kaonic helium puzzle" (a discrepancy between theory and experiment) was now resolved. © 2012 Elsevier B.V.


Curceanu C.,National Institute of Nuclear Physics, Italy | Bazzi M.,National Institute of Nuclear Physics, Italy | Beer G.,University of Victoria | Bombelli L.,Politechno di Milan | And 36 more authors.
Few-Body Systems | Year: 2011

The DAΦNE electron-positron collider at the Laboratori Nazionali di Frascati of INFN has made available a unique quality low-energy negative kaons "beam". The SIDDHARTA experiment used this beam to perform unprecedented precision measurements on kaonic atoms, while the AMADEUS experiment plans to perform in the coming years precision measurements on kaon-nuclei interactions at low-energies, in particular to study the kaonic nuclei. The two experiments are briefly presented in this paper. © 2010 Springer-Verlag.


Ishiwatari T.,Stefan Meyer Institute For Subatomare Physik | Bazzi M.,National Institute of Nuclear Physics, Italy | Beer G.,University of Victoria | Bombelli L.,Politechno di Milan | And 34 more authors.
AIP Conference Proceedings | Year: 2010

The SIDDHARTA experiment successfully measured kaonic atom X-rays using four gas targets of hydrogen, deuterium, helium-3, and helium-4 at the DAΦNE electron-positron collider. Excellent performance of the SDDs under beam conditions was found in terms of X-ray energy resolution and a good background suppression capability. The preliminary results of the strong-interaction shifts of the kaonic atoms with Z = 1 and 2 are given. © 2010 American Institute of Physics.


Okada S.,National Institute of Nuclear Physics, Italy | Bazzi M.,National Institute of Nuclear Physics, Italy | Beer G.,University of Victoria | Berucci C.,National Institute of Nuclear Physics, Italy | And 38 more authors.
AIP Conference Proceedings | Year: 2011

We have measured the K-series x-rays of kaonic hydrogen atoms to determine the strong-interaction energy-level shift and width of the 1s atomic state with significant improvements over the previous experiments. The measurement offers a unique possibility to precisely determine the complex K-p S-wave scattering length. We have also measured kaonic x-ray spectra with several gaseous targets: deuterium, helium-3 and helium-4. In this paper, we present an overview of this experiment and preliminary spectra of those kaonic x-rays. © 2011 American Institute of Physics.


Cargnelli M.,Stefan Meyer Institute For Subatomare Physik | Bazzi M.,National Institute of Nuclear Physics, Italy | Beer G.,University of Victoria | Berucci C.,National Institute of Nuclear Physics, Italy | And 37 more authors.
Hyperfine Interactions | Year: 2012

The K̄N system at rest plays a key role for the understanding of strong interaction of hadrons with strangeness involved. The experiment SIDDHARTA used X-ray spectroscopy of kaonic atoms to measure the strong interaction induced shift and width of the ground state. It was the first experiment on kaonic He3 and deuterium ever, kaonic hydrogen was measured with improved precision resulting in ε 1s=-283± 36(stat) ± 6(syst) eV and Γ 1s=541 ±89(stat) ± 22 (stat) eV. Additionally a scheme for an improved future experiment on kaonic deuterium is introduced in this contribution. © 2011 Springer Science+Business Media B.V.

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