Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session EH: Instrumentation III
7:00 PM–9:30 PM,
Thursday, October 25, 2018
Hilton Room: Kona 2/3
Chair: Darek Seweryniak, Argonne National Laboratory
Abstract ID: BAPS.2018.HAW.EH.2
Abstract: EH.00002 : Development of the S-2S spectrometer and the fiber target for high-resolution spectroscopic study of the Xi-hypernuclei*
7:15 PM–7:30 PM
(Tokyo Institute of Technology)
A missing mass spectroscopy of the Xi-hypernuclei was performed via the 12C (K-,K+) reaction at J-PARC K1.8 beam line in 2015.
We have achieved the missing mass resolution 5.4 MeV (FWHM) which is the best resolution in the Xi-hypernuclear missing mass studies.
It is important to achieve a better missing mass resolution of 2MeV (FWHM) to observe the hypernuclear structure including core excitation.
We are constructing a new spectrometer S-2S(Strangeness -2 Spectrometer) for the K+, with an improved momentum resolution. In this condition, the total missing-mass resolution would be affected mainly due to the target energy loss straggling when we use a thick target to enhance the production.
To reduce energy loss straggling in the target, we are developing an active target composed of about 1000 scintillating fibers of phi 3 mm. This active fiber-target system enables us to correct energy loss of K- and K+ event by event.
Construction of the magnets and most parts of detectors for S-2S has been completed. It will soon be ready for installation in J-PARC K1.8.
*JSPS KAKENHI Grant Numbers 23000003, 16H02186.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.EH.2
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