Recent results from BLAST detector

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Presentation transcript:

Recent results from BLAST detector Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Bates Linear Accelerator center Siberian Snake 850 MeV cw polarized electron beam Beam polarization longitudinal at target Storage ring filled to 225 mA; helicity flipped each fill Lifetime 25 to 30 minutes Automated synchronization of ring fill, detector HV ramp, data taking, ring dump using the EPICS control system Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Electron beam polarization Compton polarimeter Compton polarimeter provides online control of stored beam polarization Laser beam helicity flipped with a Pockels cell (~10Hz) Backscattered photons are detected with CsI crystal Electron beam polarization flipped every new fill Average beam polarization 67% Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Polarized Internal Target ABS (Atomic Beam Source) produces flux of Hydrogen or Deuterium atoms ABS intensity ~ Dri-film coated T-shaped storage cell. Target thickness ~ Hydrogen polarization Pz78% Deuterium polarization Pz72%, Pzz 68% Target polarization flipped every 5 min Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

BLAST Toroidal field 3.8 kG 2 instrumented sectors in the horizontal plane - Drift chambers - Cerenkov detectors - Time of Flight scintillators - Neutron detectors BLAST DATA: 2004, Hydrogen - Pz78%, 81 pb-1 2004, Deuterium - Pz84%, 130 pb-1 Pzz68% 2005, Deuterium - Pz72%, 180 pb-1 Pzz56% BEAM TARGET Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Kinematics for spin-dependent electron scattering Electron scattering into left sector : q vector ~ perpendicular to target spin (perpendicular kinematics) Electron Left Right Electron scattering into right sector : q vector ~ parallel to target spin (parallel kinematics) B p e’ q e Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

BLAST physics program Pol Vect.-Pol Tens.-Pol -production Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Measurements of neutron form factor Product of beam and target polarizations (hPz) is determined from 2H(e,e’p)n reaction and verified with 2H(e,e’n)p in parallel kinematics The Form Factors ratio is measured in perpendicular kinematics Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Preliminary results Small systematic errors: The largest contribution (5%)– from the uncertainty in the target polarization angle (~12 % per degree) Uncertainty in hPz 2.5% Uncertainty in magnetic Form Factor 1.5 % Model dependency < 3% Radiative effects <1% Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Measurements of deuteron form factors Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Preliminary results The largest systematic error(~5%) – from the normalization on low-q points Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

In the Born approximation , In the Born approximation vanishes in the L=0 model for deuteron (no L=2 admixture) => is a good measure of L=2 component is a good measure of L=2 component and reaction mechanisms : MEC, IC, RC Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Vector Asymmetry Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Tensor Asymmetry Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Separation of charge and magnetic proton form factors Existing data: 1.Rosenbluth separation 2.Polarization transfer measurements (scattering of polarized electrons on Hydrogen target and measuring a polarization of recoil protons) Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

World Data Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Scattering of polarized electrons on polarized protons Super ratio Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Preliminary Results from BLAST BLAST Left Sector BLAST Right Sector Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Preliminary Results from BLAST Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Preliminary Results from BLAST with World Data Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT

Conclusion Preliminary results from BLAST quasi-elastic d(en) ( ) elastic d(ed) (T20) quasi-elastic d(ep) elastic p(ep) ( ) Factor of two more data to analyze Also analyzing data on  production,  resonance, T10/T11, inclusive…. More results to come ! Nucleon05 Oct. 12-14, 2005 Evgeni Tsentalovich MIT