TY - JOUR
T1 - Development and application of CATCH
T2 - A cylindrical active tracker and calorimeter system for hyperon–proton scattering experiments
AU - Akazawa, Y.
AU - Chiga, N.
AU - Fujioka, N.
AU - Hayakawa, S. H.
AU - Honda, R.
AU - Ikeda, M.
AU - Matsuda, K.
AU - Miwa, K.
AU - Nakada, Y.
AU - Nanamura, T.
AU - Ozawa, S.
AU - Shiozaki, T.
AU - Tamura, H.
AU - Umetsu, H.
N1 - Funding Information:
We thank the staff of CYRIC for their support in providing the beam used for the experiment. We are grateful to S. Callier and the OMEGA group for arranging for the EASIROC chip. We also thank the KEK electronics group for developing the VME-EASIROC board. This study was supported by JSPS KAKENHI Grant Numbers 23684011 , 15H05442 , 15H02079 , and 18H03693 . It was also supported by Grants-in-Aid Numbers 24105003 and 18H05403 for Scientific Research from the Ministry of Education, Culture, Science, and Technology (MEXT) , Japan.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/4/11
Y1 - 2022/4/11
N2 - In this study, we developed a new proton detector system called CATCH, which was designed for a scattering experiment involving a Σ hyperon and a proton (J-PARC E40). CATCH is a cylindrical detector system covering an inner target that can be used to measure the trajectory and energy of a proton emitted from the target for the kinematic identification of a Σp scattering event. It comprises a cylindrical fiber tracker (CFT), a bismuth germanate (BGO) calorimeter, and a plastic scintillator hodoscope (PiID), which are coaxially arranged from the inner to the outer sides. The CFT is a tracking detector consisting of 5,000 scintillation fibers, and it has two types of cylindrical layers in which the fibers are arranged in straight and spiral configurations. 24 BGO crystals are placed around the CFT to measure the kinetic energy of the recoil proton. The PiID is used to determine whether the recoil proton is stopped in the BGO calorimeter. We performed proton–proton (pp) and proton–carbon (pC) scattering experiments using an 80 MeV proton beam to evaluate the performance of CATCH. The total energy resolution for the recoil proton was 2.8 MeV in σ for the entire angular region after the energy calibrations of the BGO calorimeter and the CFT. The angular resolution of the CFT was 1.27 degrees in σ for the proton, and the time resolution was more than 1.8 ns in σ. We also developed an analysis method for deriving the cross section of the pp scattering using CATCH. The obtained relative differential cross section for the pp elastic scattering was consistent with that obtained by reliable partial wave analysis, and the systematic error was maintained at below 10%. These performance results satisfy our requirements for a reliable detection system for the Σp scattering experiment conducted at J-PARC.
AB - In this study, we developed a new proton detector system called CATCH, which was designed for a scattering experiment involving a Σ hyperon and a proton (J-PARC E40). CATCH is a cylindrical detector system covering an inner target that can be used to measure the trajectory and energy of a proton emitted from the target for the kinematic identification of a Σp scattering event. It comprises a cylindrical fiber tracker (CFT), a bismuth germanate (BGO) calorimeter, and a plastic scintillator hodoscope (PiID), which are coaxially arranged from the inner to the outer sides. The CFT is a tracking detector consisting of 5,000 scintillation fibers, and it has two types of cylindrical layers in which the fibers are arranged in straight and spiral configurations. 24 BGO crystals are placed around the CFT to measure the kinetic energy of the recoil proton. The PiID is used to determine whether the recoil proton is stopped in the BGO calorimeter. We performed proton–proton (pp) and proton–carbon (pC) scattering experiments using an 80 MeV proton beam to evaluate the performance of CATCH. The total energy resolution for the recoil proton was 2.8 MeV in σ for the entire angular region after the energy calibrations of the BGO calorimeter and the CFT. The angular resolution of the CFT was 1.27 degrees in σ for the proton, and the time resolution was more than 1.8 ns in σ. We also developed an analysis method for deriving the cross section of the pp scattering using CATCH. The obtained relative differential cross section for the pp elastic scattering was consistent with that obtained by reliable partial wave analysis, and the systematic error was maintained at below 10%. These performance results satisfy our requirements for a reliable detection system for the Σp scattering experiment conducted at J-PARC.
KW - Bismuth germanate (BGO) calorimeter
KW - Cylindrical detector
KW - Scintillation fiber tracking detector
KW - Σ-proton scattering
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U2 - 10.1016/j.nima.2022.166430
DO - 10.1016/j.nima.2022.166430
M3 - Article
AN - SCOPUS:85124803085
SN - 0168-9002
VL - 1029
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
M1 - 166430
ER -