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Observation of the Helium 7 Lambda hypernucleus by the (e,e'K+) reaction

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arxiv 1207.0571 v4 pith:OLSIFI4S submitted 2012-07-03 nucl-ex

Observation of the Helium 7 Lambda hypernucleus by the (e,e'K+) reaction

classification nucl-ex
keywords lambdareactionenergyhypernuclearhypernucleusresolutionspectrometerbest
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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An experiment with a newly developed high-resolution kaon spectrometer (HKS) and a scattered electron spectrometer with a novel configuration was performed in Hall C at Jefferson Lab (JLab). The ground state of a neutron-rich hypernucleus, He 7 Lambda, was observed for the first time with the (e,e'K+) reaction with an energy resolution of ~0.6 MeV. This resolution is the best reported to date for hypernuclear reaction spectroscopy. The he 7 Lambda binding energy supplies the last missing information of the A=7, T=1 hypernuclear iso-triplet, providing a new input for the charge symmetry breaking (CSB) effect of \Lambda N potential.

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