Nov.29,2011/HU group meeting Spectroscopic Investigation of P-shell Λ hypernuclei by (e,e'K + ) - Analysis Updated Status - Chunhua Chen Hampton Universithy.

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Presentation transcript:

Nov.29,2011/HU group meeting Spectroscopic Investigation of P-shell Λ hypernuclei by (e,e'K + ) - Analysis Updated Status - Chunhua Chen Hampton Universithy

Outline  Experimental Goal of E05115  Kinematics of the E05115  Experimental Setup of E05115  Analysis process and status  Preliminary results

Experimental Goal The 3rd Generation (e,e’K+) Hypernuclear Spectroscopy in JLab- HallC  Medium - heavy hypernuclear spectroscopy 52 Cr(e,e’K+) 52  V   hyperon bound in the mean field  quark picture vs. conventional picture  Light  hypernuclear spectroscopy   N interaction, ls coupling, Charge Symmetry Breaking  p shell hypernuclei : 12 C(e,e'K+) 12 Λ B, 7 Li(e,e'K+) 7 Λ He, 10 B(e,e'K+) 10 Λ Be, and 9 Be(e'K+) 9 Λ Li Calibration by the elementary process p(e,e’K+)Λ or Σ : H2O and CH2

Kinematics of the E Experiment Momentum: 2.344GeV/c Momentum: 0.844GeV/c ±17% Angular acceptance: 3° 〜 9° Momentum: 1.2GeV/c ±12.5% Angular acceptance : 1° 〜 13 ° 1.5GeV γ* Scattered electron K+ Electron beam M.Q.Tran et al. PLB445 (1998) 20   p →  K + Target nucleus p Coincidence measurement

Kinematics of the E Experiment Momentum: 2.344GeV/c Momentum: 0.844GeV/c ±17% Angular acceptance: 3° 〜 9° Momentum: 1.2GeV/c ±12.5% Angular acceptance : 1° 〜 13 ° 1.5GeV γ* Scattered electron K+ Electron beam M.Q.Tran et al. PLB445 (1998) 20   p →  K + Target nucleus p Coincidence measurement

Experimental Setup

- Tilt Method- Electroproduction differential cross section(Miloslav Sontana) Г : virtual photon flux

Experimental Setup -Detector Package- HES-D e’ EHOD2 EHOD 1 EDC2 EDC1 HES Detectors

Flow Chart Tracking (KDC) Tracking (KDC) TOF (Hodoscopes) TOF (Hodoscopes) KID (AC,WC,LC) KID (AC,WC,LC) HKS Focal Plane (X,X’,Y,Y’,T fp ) HKS Focal Plane (X,X’,Y,Y’,T fp ) HKS Optics (HKS+Splitter) Optics (HKS+Splitter) HKS Target Plane (X’, Y’, P, T tar ) HKS Target Plane (X’, Y’, P, T tar ) Tracking (EDC) Tracking (EDC) TOF (Hodoscopes) TOF (Hodoscopes) HES Focal Plane (X,X’,Y,Y’, T fp ) HES Focal Plane (X,X’,Y,Y’, T fp ) HES Optics (HES+Splitter) Optics (HES+Splitter) HES Target Plane (X’, Y’, P, T tar ) HES Target Plane (X’, Y’, P, T tar ) Coincident (RF ) Coincident (RF ) Kinematics Correction (Beam, Target effects, Momentum, Angular) Kinematics Correction (Beam, Target effects, Momentum, Angular) Missing Mass Raw Data Need to do Data & Info Lambda&Sigma Spectra Lambda&Sigma Spectra Geant4 Simulation HKS Sieve Slit HES Sieve Slit

Particle ID

Tracking Status HKS tracking residual~200µm EDC1-1 single CH2 Run(76312)

Coincident Events Selection abs( coincident time)<=1 Path-length correction has done  Coincident Time: The correlation of HKS target time and HES target time, give us the coincident spectrum: Real events Accidental

Forward Optics Tuning Purple: Real HKS SS data Blue: Geant4 Simulation Target BeamKaon Q1 Q2 Splitter field contour on xoz plane The leakage of splitter fringe field causes the cross talk between the splitter and quadrupole 15

Forward Optics Tuning The asymmetry functions are introduced and tuned for HKS&HES quadrupole field Bx and By, independently.

Spectrometer System Calibration Kinematics calibration (ΔE beam0, Δ P K,Δ Pe’ ) Optical calibration M 17

Kinematics calibration: utilizing well known masses of ,   produced from CH 2, 12 Λ Bgs from 12 C to determine binding energy to a level of precision ~100keV Optical calibration: Minimize Chisquare w.r.t reconstruction matrix M by an Nonlinear Least Square method. Mgs: fitted mean M Λ &M Σ : theoretical data ω i : statistic weigth 18

Preliminary Results Start Point Current Status 19

Preliminary Results 20

Preliminary Results Resolution : ~850 keV (FWHM) for g.s. 7 Li(e,e'K+) 7 Λ He Resolution : ~700 keV (FWHM) for g.s 12 C(e,e'K+) 12 Λ B 21

Thank you for your attention! 22

BACK UP 23

CoincidentCoincident t 2 ns Electron pulse  RF Structure: Jlab electron beam has a 2ns pulse pattern. After path length correction, we have the structure of HKS target time: Real Events Accidental RF vs HES XRF vs HKS X  Coincident Time: The correlation of HKS target time and HES target time, give us the coincident spectrum: 2ns After Path length correction 24