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Nuclear Interaction Group - Previous Research Programs - 1995 ~ 2009

Jefferson Lab BATES Mainz

JLab Physics

From as far back as the conceptual statges of JLab, the NIG group has contributed and is continuously contributing to it in various ways. We have enriched its physics program by proposing many experiments in Halls A and B. Our Ph.D. students have participated numerous experiments in all three Halls and have completed their theses based on the data they have collected, and many of them have become leading physicists in their post-graduate career. We have also made major contribution to the hardware and software development of Hall A ands C since their early years.

Experiments proposed by NIG members and completed by 2009

Experiment
 Spokesperson
Title
 Beam
Days
 Rating
E-89-003 W. Bertozzi
K. Fissum
A. Saha*
L. Weinstein		 MIT
U of Lund
JLab
ODU		 Study of the Quasielastic (e,e'p) reaction in 16O at High Recoil Momentum Webpage 20
 B-
E-89-027 W. Bertozzi
W. Boeglin
L. Weinstein*		 MIT
FIU
ODU
 Coincidence Reaction Studies with the CLAS 33 B+
E-00-102 W. Bertozzi*
K. Fissum*
A. Saha*
L. Weinstein*		 MIT
U of Lund
JLab
ODU
 Testing the limits of the Single Particle Model in 16O(e ep): An update to E89-003 20
 A-
E-01-015 W. Bertozzi
E. Piasetzky
J. Watson
S. Wood*		 MIT
U of Tel Aviv
Kent State U
JLab		 Proposal 97-106 (update) Studying the Internal Small-Distance Structure of Nuclei via the Triple Coincidence (e,e'p+N) Measurement 23
 B+
E-05-102 S. Gilad
D.W.Higinbotham
W.Korsch
S. Sirca* B.E.Norum		 MIT
JLab
U of Kentucky
UVa           		Measurements of Ax and Az Asymmetries in the Quasi-elastic 3He(e,e'd) Reaction 15
 A-
E-08-005 T. Averett
D. Higinbotham
V. Sulkosky*		 W&M
JLab
MIT		 Measurement of the Target Single-Spin Asymmetry, Ay, in the Quasi-Elastic 3He(e,e'n) Reaction 15
 B+

Experiments in Hall A

Ph.D. Theses Experiments
  • We performed the first Hall-A experiment, E89-003. And these first data of Hall A have become the theses of two of our former Ph.D. students, Juncai Gao and Nilanga Liyanage.
  • E89-044 was completed in March 2000, and has become the thesis of Marat Rvachev.
  • E91-011 on pion production was completed in July 2000, and has become the thesis of Zhengwei Chai.
  • A precision measurement of the neutron spin structure, E99-117, was completed in August 2001 and was the thesis topic of Xiaochao Zheng, who also won the JLab thesis prize due to this work.
  • Our student, Yi Qiang, has performed the best resolution, most precise and most extensive search to date of 3 pentaquark partners of the Theta+, experiment E04-012 at Hall A in 2005, and finished his thesis on this topic.
  • Our student, Peter Monaghan, has completed in 2005 his experiment aimed at studying the short-distance behavior in nuclei by using the triple-coincidence 12C(e,e'pp) and 12C(e,e'pn) reactions E01-015.
  • A high precision measurement of the proton elastic form factor ratio pGEp/GMp, E08-007, was performed using Hall A recoil polarimetry in May 2008 and has become the thesis of Xiaohui Zhan.
Other experiments
  • E89-033: Measurement of Recoil Polarization in the 16O Reaction with 4 GeV Electrons
  • E91-026: Measurement of the Electric and Magnetic Structure Functions of the Deuteron at Large Momentum Transfers
  • E93-050: Virtual Compton Scattering
  • HAPPEX expeirments, measurement of the parity violating asymmetries in e-p and e-4He elastic scattering and strangeness content of the nucleon.
  • E93-027: Measurement of the Electric Form Factor of the Proton by Recoil Polarization

Experiments in Hall-B

  • E91-023, Measurement of the GDH sum rule on the proton, was completed during CLAS eg1 running period. It was the thesis experiment of Alex Skabelin.
  • E89-027, Searching for Short Range Correlations Using (e,e'NN) Reactions, was completed during CLAS e2 running period. It was the thesis experiment of Bin Zhang.
  • In addition to providing leadership in the pursuit of particular physics and analysis goals, the NIG also performs general service work for the collaboration's efforts.

Experiments in Hall-C

  • E97-106 - Study of the Small Inter-Nuclear Distance Structure via the (e,e'pN) Reaction.
  • Our student, Andrew Puckett, successfully ran experiments E04-108 and E04-019 in experimental Hall C at year 2008. Both experiments measured the proton electric-magnetic form factor ratio using the recoil polarization technique. Andrew finished his thesis on the experiment E04-108, which won him the JLab thesis prize in year 2010.

MIT - BATES LINEAR ACCELERATOR CENTER

The Out-Of-Plane spectrometer (OOPS) system and its physics program

    The OOPS system allows detection of the final state particles from a scattering process outside the scattering plane. Hence, it allows extraction of the reaction cross section with more degrees of freedom than typical in-plane spectrometers. The OOPS is also complementary to typical large solid angle devices such as the BLAST detector at Bates and the CLAS detector in JLab Hall-B because it is designed to measure small effects with relatively high luminosity and consequently low statistical accuracy. There are now several OOPS experiments which have been approved by the Bates PAC with high scientific grades, three(3) of which have NIG member(s) as spokespersons. Practically, we play a central role in all other experiments and it is fair to say that our group is a leading player in the entire OOPS program. The physics of these experiments fall into four categories:

    Studies of the Quadrupole Component in the N -> Delta Transition:
    E87-09-1H, E97-05-1H, E97-04-1H.

    Studies of the Electromagnetic Currents in Deuterium:
    E89-14-2H n in various kinematics regions
    E89-10-2H n on the quasi-elastic peak.

    Studies of the Generalized Polarizabilities of the Proton via Virtual Compton Scattering:
    E97-03-1H.

    Studies of Few-Nucleon Systems:
    E97-06, E97-01-4He 3H.

    To be specific, the entire year of 2004 was devoted to data taking with the BLAST detector.

    http://www2.lns.mit.edu/nig/images/button.gifOur student, Chi Zhang, has obtained the most precise and extensive data set on the tensor polarization of the deuteron, T20, induced by elastic electron scattering. The preliminary data, together with the world data and several theoretical predictions of this quantity as a function of the transferred momentum are displayed in right. T20 is a fundamental quantity that is required for the separation of the elastic electric and quadrupole form factors of the deuteron. It provides stringent conditions on theoretical models. (* click figure to enlarge)

     

    http://www2.lns.mit.edu/nig/images/button.gifOur second student at Bates, Yuan Xiao, has obtained the first data set of the double-polarization (in this case, both beam and target are polarized) asymmetry in the electroproduction of pi+ off the proton in the Delta(1232) resonance region. These unique data are important to the understanding of the small quadrupole amplitudes in the gamma* p -> Delta+ -> pi+ n, the isospin partner of the more commonly-studied gamma* p -> Delta0 -> pi0 n transition. These very preliminary data are displayed together with predictions of 2 commonly-used models, MAID2003 and that of Sato-Lee.