The third generation $$\Lambda$$ hypernuclear spectroscopy via the(e, e'K$^+$) reaction at Jefferson Lab

Conference · Fri May 01 04:00:00 EDT 2009

OSTI ID:1999628

Kawama, Daisuke

Spectroscopic studies of $$\Lambda$$ hypernuclei via the (e,e'K$$^{+}$$) reaction play an important role to investigate $$\Lambda$$ hypernuclear structure. The reaction favorably excites spin-filp states and produces mirror hypernuclei compared to hypernucleus via meson-induced reactions. So far, as a counter experiment, this is the only technique that allows absolute mass determination of hypernuclei with accuracies of a few 100 keV or better. Two previous experiments that we performed, JLab E89-009 and E01-011, established the experimental technique and we obtained hypernuclear mass spectra up to A $$\sim$$ 30 with energy resolution of $$\le$$ 400 keV (FWHM). Our next experiment will investigate $$\Lambda$$ hypernuclei in wide mass region up to A $$\sim$$ 50. A newly constructed electron spectrometer (HES) and splitter magnet will increase the hypernuclear yield by about 5 times while preserving the achieved energy resoluton. Together with the existing kaon spectrometer (HKS), the installation in Jefferson Lab's Hall C is starting from spring 2009. This presentation will give the latest preparation status of the experiment and outline of the experimental program and technique of the JLab E05-115 experiment.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1999628
• Report Number(s): JLAB-PHY-09-985; DOE/OR/23177-0833
• Country of Publication: United States
• Language: English