[Triumf-seminars] TRIUMF Seminar today at 14:00

postmaster at admin.triumf.ca postmaster at admin.triumf.ca
Tue Mar 27 05:00:00 PDT 2007

Date/Time: Tue 2007-03-27 at 14:00

Location:  Auditorium          

Speaker:   Johann Zmeskal (SMI, Vienna)

Title:     From exotic atoms to exotic nuclei - the SIDDHARTA and AMADEUS experiments at LNF

Abstract: With precise X-ray spectroscopy on kaonic hydrogen atoms at the DAΦNE electron-positron collider at Laboratori Natzionali di Frascati the chiral symmetry breaking scenario in the strangeness sector will be investigated by studying the K-p  and K-d  s-wave interaction at threshold. 

The strong interaction induced shift and width of the kaonic hydrogen 1s atomic state was measured with DEAR (DAΦNE Exotic Atom Research) and in the future - with SIDDHARTA (Silicon Drift Detector for Hadronic Atom Research with Timing Application) - the kaonic hydrogen system will be measured more precisely. In addition, data on the yet unmeasured K-d system will become available. Kaonic hydrogen, together with precision measurements of kaonic helium, will allow the study of the sub-threshold Λ(1405) resonance, which might act as a doorway to form antikaon-mediated deeply bound nuclear states in light nuclei.

To search for these possible new states, a new experiment is planned called AMADEUS (Antikaonic Matter At DAΦNE: Experiments with Unraveling Spectroscopy). Deeply bound antikaon nuclear states ( -nuclear clusters) will offer, if they exist,  the ideal conditions for investigating the way in which the spontaneous and explicit chiral symmetry breaking pattern of low-energy QCD changes in the nuclear environment.  

An overview of the status of the SIDDHARTA and AMADEUS experiments will be given.


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