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Milano, Italy

Vazquez Doce O.,National Institute of Nuclear Physics, Italy | Bazzi M.,National Institute of Nuclear Physics, Italy | Berucci C.,National Institute of Nuclear Physics, Italy | Bombelli L.,Politechno di Milan | And 28 more authors.
Hyperfine Interactions | Year: 2012

AMADEUS is an experiment planned to be performed at the DAΦNE e +e - collider of the Frascati National Laboratories (Italy) of INFN, to investigate the antikaon-nuclei interaction at low energies. AMADEUS will perform, for the first time, full-acceptance studies of antikaon interaction in light nuclei, including a complete experimental program for the case of the kaonic nuclear clusters. The study of the absorption of antikaon by the nucleus will provide information concerning the K̄N interaction and the modification of the kaon mass in the nuclear medium. The experiment is being preceded by the study of the hadronic interactions of K - in the 4He of the drift chamber from the KLOE experiment data. © 2011 Springer Science+Business Media B.V. Source


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. Source


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. Source


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. Source


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. Source

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