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核 子

核 子. 通常の核. ハイパー核. Magnetic Moments of Hypernuclear states. K. Nakai (IIAS). Ultimate goal of my hypernuclear experiments. 5 Λ He. τ= 2.6 x 10 -10 sec μ〜μ(Λ) = - 0.613 nm B = 20kG 　⇨　 ωτ = 0.03 rad = 1.7 ゜. 5 Λ He. 1994 Internationa Symposium at Riken in honor of Akito Arima

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核 子

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  1. 核子 通常の核 ハイパー核 Magnetic Moments of Hypernuclear states K. Nakai (IIAS) Ultimate goal of my hypernuclear experiments

  2. 5ΛHe τ= 2.6 x 10-10 sec μ〜μ(Λ) = - 0.613 nm B = 20kG　⇨　ωτ = 0.03 rad = 1.7゜ 5ΛHe 1994 Internationa Symposium at Riken in honor of Akito Arima “Frontiers of Nuclear Structure Physics” Can’t you measure hypernuclear magnetic moments ? Motivated by Akito Arima Stimulated by Gene Sprouse In a TEMPURA restaurant at Ikebukuro. Atomic Hyperfine Field Bhf(H:2S1/2) = 334 kG Bhf(5ΛHe+) = 23x 334 kG = 2,670 kG ⇨ωτ = 40.8 rad = 234゜

  3. J J J F F F I I ν I 0 H cosωt 1 J F I Rotating Frame Laboratory Frame 5ΛHe ω=ω0=2πν0 Hyperfine Frequency ν0 (5ΛHe+) = 23 x 1,420 MHz = 2,500 MHz Resonance Width (natural) 　⊿ν= 1/(2πτ) = 600 MHz (⊿ν/ν0) = 24 % RF Power ω1τ= ｇFH1μB/ h ≧ π 　　⇨ H1 ≧ 1 kG

  4. Production of the 5ΛHe Generation of the 5ΛHe+ GSI, 2-GeV/N 6Li-ion beam 6Li + X →5ΛHe+ p + K+ + X’ ( p + p → Λ+ p + K+ ) J-PARC: 3-GeV Ring π+ + 6Li → 6ΛLi + K+ └→5ΛHe＋p Kishimoto et al. J-PARC: 50-GeV Ring Kー+ 6Li → 6ΛLi + πー └→5ΛHe＋p 5ΛHe+ Slowing down of the GeV 5ΛHe+ + X X Electron sticking in a ring Challenge ! Target technology Li vapor in 2.5-GHz cavity Thin cavity-window for emitted particles ？ ◎ Well studied by Kishimoto et al. ○ Earlier start-up Pulsed πbeam ？ Challenge ! Larger (K,π)cross section ○ ？ Sufficient time for preparation

  5. 5 μ(ΛHe) = ? ? ? ± 0.06(?) μ(Λ) = ー 0.613 ± 0.009 Predictions ??? Theoretical (1) Saito,-Oka-Suzuki, Nucl. Phys. A625(1967) p.95- 9% (2) Nemura-Akaishi-Suzuki, PRL89(2002)142504 (3) Toki Experiental Spin-Dependent ΛＮ Interactions (Following arguement )

  6. 1978 Heidelberg-Saclay Coll. at CERN ΛN interaction （Central force） Hypernuclear Exp. （L-S force） 0 u L d s LS LS V V ∞ ΣN N N ∞ u ∞ ∞ N d u 1988 Yazaki Quark cluster model ＜ Gluon and quark combined exchange Spin-Dependent ΛＮ Interactions Confirmed by KEK and BNL Experiments. 1979 Pirner 1982 Pirner and Povh

  7. 6mmΦ Iris 3“Φx3” NAI Eye needs 10 photons to recognbize 30 cm 60Co SCITIC Can you see the scintillation light ? 20ev/photon SCIntillation Track Image Camera

  8. p+ + p → K+ + S+(Production) • S+ + p → S+ + p (Scattering) • p+ + n → K+ + L (Production) • L + p → L + p (Scattering)

  9. Analyzing Power LpScattering S+pScattering Kyoto Model fss2 PL=900MeV/c PS=900MeV/c FSS Kyoto Model fss2 FSS q_LCM (degree) Analyzing Power q_SCM (degree) Analyzing Power 15 – 45 -0.08±0.30 67evnets 81evnets 25 – 50 0.75±0.32 45 – 75 -0.18±0.31 50 – 75 0.96±0.20 75 – 105 -0.14±0.19 75 – 100 0.42±0.23 105 – 135 0.00±0.35 100 – 125 0.00±0.27 125 - 150 -0.75±0.45

  10. ∞ ∞ ∞ ∞ ∞ ∞ ∞ ∞ uds Χ Gluon and quark combined exchange No s-quark vs. u,d-quark interaction Λ-spin behaves like a spectator

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