Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 36: Struktur und Dynamik von Kernen
HK 36.7: Vortrag
Mittwoch, 21. März 2012, 18:30–18:45, P 4
High Resolution Decay-Pion Spectroscopy of light Hypernuclei at MAMI — •Anselm Esser — Institut für Kernphysik, Johannes Gutenberg-Universität, Mainz
The high-resolution decay-pion spectroscopy of electro-produced hypernuclei offers a new way of precisely measuring their ground-state masses.
At the Mainz Microtron MAMI hypernuclei production by (e,e’K) reactions was studied. A dedicated kaon spectrometer located at 0∘ was used to detect kaons emitted in forward direction therefore tagging events involving strangeness. Excited hypernuclei created in the primary reaction are likely to fragment creating a set of different light hyperfragments. A large fraction of which can be stopped inside the target and deexcites electromagnetically before their decay. Mesonic two-body weak decays of these hyperfragments result in mono-energetic pions. By measuring the momenta of these pions using high-resolution magnetic spectrometers one gains direct access to the ground-state masses of most produced hyperfragments. A ground-state mass determination with a precision of < 30 keV/c2 is expected.
The status of the experiment and the data analysis of the pioneering experiment will be discussed.
Supported by DFG (SFB 443 + 1044) and EU HadronPhysics2 (SPHERE)