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Measurement of tensor analyzing powers in deuteron photodisintegration. Dmitri Toporkov Budker Institute of Nuclear Physics Novosibirsk, Russia SPIN2004, Trieste, Italy October 15, 2004. Introduction Physical motivation Experimental arrangement Polarized target Detector Results

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Measurement of tensor analyzing powers in deuteron photodisintegration
Measurement of tensor analyzing powers in deuteron photodisintegration

Dmitri Toporkov

Budker Institute of Nuclear Physics

Novosibirsk, Russia

SPIN2004, Trieste, Italy

October 15, 2004


  • Introduction

  • Physical motivation

  • Experimental arrangement

  • Polarized target

  • Detector

  • Results

  • Conclusions

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Novosibirsk Electron-Deuteron Collaboration

L.M.Barkov, V.F.Dmitriev, M.V.Dyug, L.G.Isaeva, A.V.Grigoriev,B.A.Lazarenko, S.I.Mishnev, D.M.Nikolenko, I.A.Rachek, R.Sh.Sadykov, Yu.V.Shestakov, D.K.Toporkov and S.A.Zevakov

BINP, Novosibirsk, Russia

A.Yu.Loginov, A.N.Osipov, A.A.Sidorov and V.N.Stibunov

INR, Tomsk, Russia

R.Gilman

Rutgers University, Piscataway, NJ, USA

E.R.Kinney

Colorado University, Boulder, CO, USA

R.J.Holt and D.H.Potterveld

ANL, Argonne, IL, USA

C.W.de Jager1 and H. de Vries

NIKHEF, Amsterdam, The Netherlands

S.L.Belostotsky, V.V.Nelyubin and V.V.Vikhrov

INP, St.-Petersburg, Russia

H.Arenhovel

IKP, Johanness Gutenberg-Universitat, Mainz, Germany

1Present address: TJNAF,Newport News, VA, USA

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Novosibirsk electron-positron facility

VEPP-3

Energy : 2000 MeV

Lifetime : 14000 s

Av. current : 100 mA

Bunch : 0.7x0.3 mm

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Photodisintegration of polarized deuteron

Scattering angle is small, therefore q2 close to zero and

photon is almost real.

Process is photodisintegration

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Definition of kinematic variables for the reaction ( d, pn) in the center of mass frame

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Top view of the internal target at VEPP-3 electron ring

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Cryogenic Atomic Beam Source

Cryostat

Liquid nitrogen

Turbo

pump

Tenzor polarization

Vector polarization

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


ABS just before the installation at the straight section

Magnetic pole tip field

of superconducting

magnet up to 4.8 T

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Storage cell for polarized atoms

Beam flux of polarized deuterium atoms 8.2x1016 at/sec

The measured target thickness 8x1013 at/cm2

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


The layout of the detector system, side view

200x200x1000 mm

120x400x1000 mm

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


LQ polarimeter feature

Asymmetry in elastic ed scattering at small

transfered momentum, centered at

= 9.3, Q = 0.105 (GeV/C)

2

2

At small momentum transfers

T ≈ -√2/3 Q Q

Q = 0.2859 fm - deuteron static quadrupole moment

2

20

D

2

D

2

2

At Q = 0.105 (GeV/C) all 'reasonable' theoretical

predictions for T contain within ±5% range

20

An absolute measurement of T performed at

NIKHEF, further constraining models

20

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


The average degree of target

polarization during the run was

found to be

LQP

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Beam life-time in the VEPP-3 ring during the experiment

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Charge accumulation during the experiment

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Neutron: TOF, charge veto

Proton: TOF, DE/E

Kinematic correlations:

p-n energy

p-n polar angle

p-n azimuthal angle

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Preliminary results on T20 with =83-93(full circles)and old data

Phys.Lett. B302 (1993) 277 (open circles)

K.-H.Schmitt and H. Arenhovel, Few-Body Syst. 7(1989)95

Yu.P.Melnik and A.V.Shebeko, PRC 48(1993)23 L=1.2Gev

ibid L=4mp

M.I.Levchuk, Few-Body Syst. 19(1995)77

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Preliminary results on T21 and T22 with =83-93(full circles)and old data Phys.Lett. B302 (1993) 277 (open circles)

K.-H.Schmitt and H. Arenhovel, Few-Body Syst. 7(1989)95

Yu.P.Melnik and A.V.Shebeko, PRC 48(1993)23 L=1.2Gev

ibid L=4mp

M.I.Levchuk, Few-Body Syst. 19(1995)77

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Preliminary results on T 20, T21 and T22 measurement

E 25-45 MeV 45-65 MeV 65-100 MeV

K.-H.Schmitt and H. Arenhovel full

M.I.Levchuk full

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Preliminary results on T 20, T21 and T22 measurement

E 100-150 MeV 150-250 MeV 250-400 MeV

K.-H.Schmitt and H. Arenhovel full

M.I.Levchuk full

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


Part of people, who did the experiment

Dmitri Toporkov Measurement of tensor analyzing powers SPIN2004,Trieste,Italy in deuteron photodisintegration


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