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Advanced Gamma-Ray Spectroscopy Study of Hypernuclear Interactions at Tohoku University

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20 diapositives · 316 Views · Sep 13, 2014

This presentation outlines our recent research on ΛN interactions using advanced gamma-ray spectroscopy techniques at Tohoku University in collaboration with KEK and various institutions. We discuss the experimental setup, including the use of a magnetic spectrometer and the Hyperball2 apparatus for gamma-ray analysis. Preliminary results reveal three hypernuclear gamma-ray peaks, with derived interaction parameters. We highlight issues with production rates of ground state hypernuclei compared to previous data, suggesting a need for further investigation and improved production methods.

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  1. -ray spectroscopy study of and Yue Ma Department of Physics Tohoku University

  2. CollaborationListfor 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 Hyp06

  3. Outline of the presentation • 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 & discussion • Summary Hyp06

  4. Background:ΛN interaction Central force Spin-spin force N spin-dependent spin-orbit force spin-dependent spin-orbit force Tensor force Hyp06

  5. Physics interests of the present experiment Itonaga & Millener's calculation can be employed to cross check the parameters. can help to solve the puzzle. Hyp06

  6. Experimental setup:overview ( , ) / Totally Hyp06

  7. Experimental setup & analysis: track reconstruction Momentum of pion Hyp06

  8. 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 • Ge efficiency • BGO suppression Hyp06

  9. Preliminary results:states selection Hyp06

  10. Preliminary results: gamma rays from ΛB 11 Hyp06

  11. Preliminary results:gamma rays from ΛC 12 77 23 Hyp06

  12. Discussion 1020 keV SN 418 keV Δ 2443 keV SN Hyp06

  13. Summary Summary • KEK-E566: C (pi+, K+) / @ K6 beam line, KEK • Three hypernuclear gamma-ray peaks were observed. • Two interaction parameters were derived from proper transitions. SN : -0.7~-0.9 MeV Δ : 0.3 MeV 12 12 11 ΛC ΛB SN : ~-0.4 MeV Δ: ~0.43 MeV Hyp06

  14. Hyp06

  15. 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 ground 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 9 2 2 9 2 9 Hyp06

  16. Present problems & future task • Candidate for ground state doublet transition of • Gamma-ray energy is around 150 keV • Number of counts is consistent with rough estimated value Hyp06

  17. Experimental setup & analysis :Ge detectors Photo-peak efficiency increased by 1.5 times • Clover Ge add back • Ge calibration Hyp06

  18. Hyp06

  19. Background:Physics interests of the present experiment • To measure the g-factor of a hyperoninside nuclear medium. Doppler Shift Attenuation Method (DSAM) Hyp06

  20. Background: ΛN interaction N N N N N N N N N1 N2 N2 N N N1 Hyp06