HLAB MEETING ~ Status Report ~ Toshiyuki Gogami 14Jan2014 Contents • Missing mass status • 12C, 10B and 7Li target • About 7Li target 炭素標的 12C(e,e’K+)12 ΛB 12C target Remarks Efficiencies are different between low and high current data Two set of HES collimator positions are used. Differential cross section of 12C(γ*,K+)12 ΛB ( FWHM ~ 0.89 MeV ) Peak -B [MeV] Number of event Cross section [nb/sr] 1 -11.40 ± 0.03 657±26 83 ±3 3 -8.37 ± 0.10 135±11 17 ±1 4 -5.15 ± 0.18 118±11 15 ±1 5 -1.67 ± 0.23 116±11 14 ±1 2 -0.38 ± 0.04 631±25 82 ±3 6 +0.82 ± 0.09 240±15 31 ±2 Only statistical errors 12 ΛB comparison Experiment -BΛ [MeV] Cross section [nb/sr] E05-115 -11.40 ± 0.03 83 ± 3 E01-011 -11.40 ± 0.01 ± 0.04 101 ± 4.2 (+ 38 – 31) E89-009 -11.52 ± 0.35 140 ± 17 ± 18 Emulsion -11.37 ± 0.06 N/A Experiment -BΛ [MeV] Cross section [nb/sr] E05-115 -0.38 ± 0.04 82 ± 3 E01-011 -0.41 ± 0.01 ± 0.13 94 ± 4.0 ±35 E89-009 -0.49 ± 0.16 N/A ホウ素標的 10B(e,e’K+)10 ΛBe 10B target Differential cross section of 10B(γ*,K+)10 ΛBe ( FWHM ~ 0.8 MeV ) Peak -B [MeV] Number of event Cross section [nb/sr] 1 -8.66 ± 0.08 141±12 11.6 ±0.9 2 -7.81 ± 0.23 51±7 4.3 ±0.7 3 -6.08 ± 0.09 139±12 11.8 ±1.0 4 -5.03 ± 0.14 78±9 6.5 ±0.7 5 -1.98 ± 0.10 156±13 13.0 ±0.9 6 -0.11 ± 0.16 123±11 10.0 ±0.8 7 2.23 ± 0.07 188±14 15.9 ±1.1 8 11 .14± 0.13 94 ± 10 7.8 ±0.8 Comparison with old data MeV リチウム 標的 7Li(e,e’K+)7 ΛHe 7Li target Differential cross section of 7Li(γ*,K+)7ΛHe ( FWHM ~ 1.3 MeV ) Peak -B [MeV] Number of event Cross section [nb/sr] 1 -5.28 ± 0.14 482±22 12.4 ±0.5 2 -3.50 ± 0.14 271±16 7.0 ±0.4 7Li target Remarks Target thickness ELOG Weight and area: 331.2 mg/cm2 Nitride etc.? Thickness and density: 207 mg/cm2 • Nitriding test • Check Brems. Rate in HES • Etc. Need to be done !!!! 7Li target Li : 0.534 g/cm3 Li3N : 1.27 g/cm3 LiOH : 1.46 g/cm3 (アポロ) Li2CO3 : 2.11 g/cm3 何かほかの 3.9 mm 0.4 ~ 0.8 mm Li 何かほかの 0.4 ~ 0.8 mm 1.3: 0.160235 0.410859 1.4: 0.141732 0.363416 1.5: 0.12706 0.325795 2.0: 0.0837244 0.214678 Backup 52Cr(e,e’K+)52 ΛV 9Be(γ*,K+)9 ΛLi (only figure) Differential cross section of 10B(γ*,K+)10 ΛBe Motoba’s calc. ( FWHM ~ 0.8 MeV ) Hiyama’s calc. -8.84 without CSB -8.76 with CSB Peak -B [MeV] Number of event Cross section [nb/sr] 1 -8.66 ± 0.08 141±12 11.6 ±0.9 2 -7.81 ± 0.23 51±7 4.3 ±0.7 3 -6.08 ± 0.09 139±12 11.8 ±1.0 4 -5.03 ± 0.14 78±9 6.5 ±0.7 5 -1.98 ± 0.10 156±13 13.0 ±0.9 6 -0.11 ± 0.16 123±11 10.0 ±0.8 7 2.23 ± 0.07 188±14 15.9 ±1.1 8 11 .14± 0.13 94 ± 10 7.8 ±0.8 7 ΛHe comparison ( FWHM ~ 1.3 MeV ) (FWHM ~ 1.3 MeV) Peak -B [MeV] Number of event Cross section [nb/sr] 1 -5.28 ± 0.14 482±22 12.4 ±0.5 2 -3.50 ± 0.14 271±16 7.0 ±0.4 Hiyama’s calc. -5.36 without CSB -5.16 with CSB 10B target 制動放射起因電子の計数率 Missing mass estimation by the full-modeled Monte Carlo simulation Achievable resolution ( FWHM, Unit: keV ) Hyperon Target Hypernucleus [mg/cm2] Intrinsic Mass offset due to energy loss Matrix zSimulated dependence (B) total resolution (A) Achievable resolution (A-B) Present work (Toshi’s anlysis) Λ CH2 (450) 830 1000 730 2100 1380 1600 7 ΛHe 7Li (184.0) 440 260 550 1300 750 1300 9 ΛLi 9Be(188.1) 440 260 170 740 560 Not yet 10 ΛBe 10B (56.1) 430 80 40 590 550 800 12 ΛB 12C (87.5) 430 130 80 620 540 890 52 ΛV 52Cr 430 160 30 630 600 Not yet (134.0) Part of the z-dependence (Λ, Σ0 and 12ΛB) is absorbed by the matrices in a matrix tuning. Effects of z-dependence absorption for other hypernuclei are not trivial. Blind analysis Flow chart Initial matrices (not distorted) Λ + B.G. Σ0 + B.G. 12 B s-shell Λ Generated Λ, Σ0 and hypernucei Tune Tuned matrices Λ, Σ0 and hypernucei Absorbing effects of • z-dependence • Asymmetry shape • Etc. Results + No matrix distortion Width ΔMM [keV] FWHM [keV] Mean value displacement Λ + B.G. Σ0 + B.G. 12 B s-shell Λ ΔMM < 130 keV Achieved simultaneously ! 500 ~ 700 keV (12ΛB, 10ΛB, 52ΛV) ~ 1000 keV (7ΛHe) Achievable ~ 1500 keV (Λ, Σ0) resolutions Response function
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