Testing the Limits of the Single Particle Model in 16O(e,e’p)

- Update to E00-102

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

Arun Saha Jefferson Lab, Newport News,

VA*

Hall A Collaboration MeetingJune 23, 2005

A. Saha, Hall A Collaboration Mtg., June 23, 2005

E00-102* Ran Oct. 25 – Dec. 9, 2001

• Determine the limits of validity of the single-particle model of valence proton knock-out

• Determine effects of relativity and spinor distortion on valence proton knock-out using the diffractive character of the ALT asymmetry

• Determine bound-state wave function and spectroscopic factors for valence proton knock-out

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

* Update to E89-003 – Hall A 1997 (E00-102 higher precision, higher pmiss and Emiss)

A. Saha, Hall A Collaboration Mtg., June 23, 2005

*

* E89-003 pmiss up to 0.345 GeV/c

cp

E

cq

cQ

E

miss

miss

o

GeV/0.755to515.0

GeV240.0to0

GeV499.0

GeV/066.1

)GeV/(902.0

GeV620.422

Minus kinematics

Plus kinematics

Data were obtained for the 1p-shell,1s1/2-state, and the continuum

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

A. Saha, Hall A Collaboration Mtg., June 23, 2005

People Involved

• Spokespersons: L. Weinstein (ODU), K. Fissum (Lund), A. Saha (JLab),W. Bertozzi (MIT)

• Students: M. Andersson (Lund)K. Foe (ODU)

• Post Docs: B. Reitz (JLab),W. Hinton (Hampton)R. Roche (ODU)J. Lachniet (ODU)

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

A. Saha, Hall A Collaboration Mtg., June 23, 2005

o Anticipated data points from E00-102

Data obtained from E89-003

Compared to calculations by Udias et al.

Projected ALT for Proton Knockout from 1p1/2 and 1p3/2-states of 16O

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

A. Saha, Hall A Collaboration Mtg., June 23, 2005

Overview of Analysis- M. Andersson

Relative Cross section data

0 < pmiss < 350 Mev/c

corresponds to kin A+, C+, D+, E+ and F+.

• The pmiss bins are 2 MeV/c for kin A+ through D+ and 4 MeV/c for the other two.

• Statistical Uncertainty is 7% for the overlap between proton spectrometer angular settings achieved.

• Cuts Applied: ± 50 mr in Θ and Φ, ± 3.5 % in dp.

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

A. Saha, Hall A Collaboration Mtg., June 23, 2005

Kin A+ pmiss = +70 MeV/c

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

A. Saha, Hall A Collaboration Mtg., June 23, 2005

Kin C+ pmiss = +140 MeV/c

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

A. Saha, Hall A Collaboration Mtg., June 23, 2005

Kin D+ pmiss = +175 MeV/c

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

A. Saha, Hall A Collaboration Mtg., June 23, 2005

Kin E+ pmiss = +210 MeV/c

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

A. Saha, Hall A Collaboration Mtg., June 23, 2005

Kin F+ pmiss = +280 MeV/c

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

A. Saha, Hall A Collaboration Mtg., June 23, 2005

Effective momentum distribution

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

A. Saha, Hall A Collaboration Mtg., June 23, 2005

Future Analyses Tasks

• W. Boeglin (FSU) has joined the team

- interested in the continuum part.

• Simulation work in Europe (Udias, Fissum)• Data analyses work in the US

THOMAS JEFFERSON NATIONAL ACCELERATOR LABORATORY

A. Saha, Hall A Collaboration Mtg., June 23, 2005