Oct. 13 th 2006 -ray spectroscopy study of and Yue Ma Department of Physics Tohoku University.
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Transcript of Oct. 13 th 2006 -ray spectroscopy study of and Yue Ma Department of Physics Tohoku University.
Oct. 13th 2006 Hyp06
Collaboration List for KEK-PS E566
• Tohoku Univ.: T. Koike, S. Kinoshita, Y. Ma, Y. Miura, Y. Miyagi, K. Shirotori, T. Suzuki, H. Tamura, K. Tsukada, M. Ukai, K. Futatsukawa, K. Hosomi, M. Kawai, M. Mimori, N. Terada, N. Maruyama
• KEK: K. Aoki, H. Fujioka, Y. Kakiguchi, T. Nagae, D. Nakajima, H. Noumi, T. Takahashi, T.N. Takahashi, A. Toyota
• China Institute of Atomic Energy: Y.Y. Fu, S.H. Zhou• Kyoto Univ.: M. Dairaku, K. Miwa • Osaka E.C. Univ. : T. Fukuda, S. Minami, W. Imoto • Osaka Univ.: S. Ajimura • RIKEN: K. Tanida
Oct. 13th 2006 Hyp06
Background interaction (interaction parameters) Physics interests of the present experiment
Experimental setup & analysis Magnetic spectrometer & Missing mass analysis Hyperball2 apparatus & gamma-ray spectrum analysis
Preliminary results & discussionSummary
Outline of the presentation
N
Oct. 13th 2006 Hyp06
S
Central force VSpin-spin force
Tensor force T N spin-dependent spin-orbit forceNS
spin-dependent spin-orbit forceS
Background: ΛN interaction
Oct. 13th 2006 Hyp06
Physics interests of the present experiment
C12
can be employed to cross check the parameters.can help to solve the puzzle.B10
Itonaga & Millener's calculation
Oct. 13th 2006 Hyp06
BGO suppression Ge efficiency
Experimental setup & analysis : Ge detectors
Photoelectric peak efficiency ~5 % @ 1.33 MeV when beam off Energy resolution = 5.3 keV (FWHM) @ 1.33 MeV when beam on Time resolution = 18 ns (FWHM) @ 1.33 MeV when beam on
Oct. 13th 2006 Hyp06
Preliminary results: gamma rays from ΛB11
keV2.06.261)2/52/7( :B11 E keV7.07.1481)2/52/1( :B11
E
Oct. 13th 2006 Hyp06
Discussion
keV2.06.261)2/52/7( :B11 E
keV8.23.2667)21( :C 1212 E
keV7.07.1481)2/52/1( :B11 E 1020 keV
418 keV
2443 keVSN
SN
Δ
Oct. 13th 2006 Hyp06
Summary
KEK-E566: C (pi+, K+) / @ K6 beam line, KEKThree hypernuclear gamma-ray peaks were observed.
Two interaction parameters were derived from proper transitions.
SN : -0.7~-0.9 MeV
Δ : 0.3 MeV
Summary
keV2.06.261)2/52/7( :B11 E
keV7.07.1481)2/52/1( :B11 E
keV8.23.2667)21( :C 1212 E
SN : ~-0.4 MeV
Δ: ~0.43 MeV
ΛC12 12
ΛB11
Oct. 13th 2006 Hyp06
Present problems & future task
Production rate of the ground state hypernucleus is rather different from previous data.Other experiments show that the production rate of the gro
und state is about 7 counts/(g/cm )(10 pion) In our current analysis this value is
~ 2.3 counts/(g/cm )(10 pion) 2 9
2 9
C12
C12
9
9
2
2
Oct. 13th 2006 Hyp06
Candidate for ground state doublet transition of Gamma-ray energy is around 150 keV Number of counts is consistent with rough estimated value
Present problems & future task
Oct. 13th 2006 Hyp06
Clover Ge add back
Ge calibration
Photo-peak efficiency increased by 1.5 times
Experimental setup & analysis : Ge detectors
Oct. 13th 2006 Hyp06
Background: Physics interests of the present experiment
• To measure the g-factor of a hyperon inside nuclear medium.
Doppler Shift Attenuation Method(DSAM)