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
Presenter:
Takuya Nanamura
(Kyoto University)
Authors:
Takuya Nanamura
(Kyoto University)
Tomofumi Nagae
(Kyoto University)
Shunsuke Kanatsuki
(Kyoto University)
Toshiyuki Gogami
(Tohoku University)
Hiroyuki Fujioka
(Tokyo Institute of Technology)
Hiroyuki Ekawa
(Kyoto University)
Erina Hirose
(KEK)
Ryotaro Honda
(Tohoku University)
Yudai Ichikawa
(JAEA)
Masaya Ichikawa
(Kyoto University)
Toshiyuki Takahashi
(KEK)
Hitoshi Toshiyuki
(KEK)
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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