Abstract
At the Mainz Microtron hypernuclei can be studied by (e,e'K) reactions. By detecting the kaon which is emitted in forward direction, with the KAOS spectrometer placed at 0 scattering angle, reactions involving open strangeness production are tagged. High-resolution magnetic spectrometers are then used to coincidentally detect the mono- energetic decay-pions from mesonic two-body weak decays of light hypernuclei at rest. As a pioneering experiment has confirmed, the KAOS spectrometer is exposed to a large flux of background particles, mostly positrons from bremsstrahlung pair production. In order to increase the e ciency of kaon identification the KAOS spectrometer was modi- fied to suppress background particles at the cost of a high momentum resolution, which is less important for this experiment. This was achieved by placing up to 14 cm of lead absorbers in front of the detectors, in which positrons are blocked by forming electro- magnetic showers while the e ect on kaons is limited. An additional time-of-flight wall and a new threshold ˘ Cerenkov detector help to increase the detection e ciency of kaons.
Highlights
Light nuclei containing one or more strange baryons are a good testing ground for models of nucleon interactions
Most spectroscopic methods applicable to hypernuclei are restricted to only one of the isobars so the resulting mass differences are subject to the systematical errors of the different spectroscopic techniques
The spectroscopy of pions originating in the decay of light hypernuclei at rest offers a unique way of accessing the ground-state masses of several light hypernuclei in a single experiment minimising the effect of systematic errors
Summary
Light nuclei containing one or more strange baryons are a good testing ground for models of nucleon interactions. The spectroscopy of pions originating in the decay of light hypernuclei at rest offers a unique way of accessing the ground-state masses of several light hypernuclei in a single experiment minimising the effect of systematic errors. After being stopped inside the target a large fraction of these decay in a two-body mesonic weak reaction resulting in mono-energetic pions. These decay-pions carry the information needed for calculating the ground-state mass of the light hyperfragment [2]. The set-up of both experiments is discussed in [3]
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