understanding the three-body nuclear system: asymmetry measurements in quasi-elastic ge jin...
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Understanding the Three-Body Nuclear System: Asymmetry Measurements in Quasi-Elastic
Ge JinUniversity of VirginiaFor the E05-102 Collaboration
p)e',e(He and d)'e,e(He 33
Deuterium Spin Structure
Spin-1 Particle, 2 spin-1/2 Nucleons (Proton and Neutron)
Angular Momentum l=0 l=2 ~90% ~10%
Asymmetry Measurements at NIKHEF A sign flip of asymmetry
with the increase of missing momentum gave an indication of the existence of D state
Sign flip happened at around Fermi momentum of deuterium nucleus
p)n'e,e(D
I. Passchier et al., Phys. Rev. Lett. 88 (2002) 102302.
3He Spin Structure: Will Similar Things Happen with Asymmetry?
Spin-1/2 Particle, 3 spin-1/2 Nucleons (Proton and Neutron)
Angular Momentum l=0 l=0 l=2 ~90% ~1-2% ~8%
EffectiveNeutronTarget
Theoretically, Yes, according to Faddeev Calculation on p)e',e(He and d)'e,e(He 33
Our Lack of Knowledge of 3He is Affecting Other JLab Experiments! JLab experiment E99-
117 measured neutron asymmetry A1
n in DIS region, the leading error other than statistical is caused by uncertainty in the effective proton and neutron polarization in 3He
X. Zheng et al., Phys. Rev. C 70, 065207(2004)
3He Target
Hybrid K-Rb spin exchange optical pumping
High in-beam polarization ~60% Narrow band-width laser
Separating protons and deuterons
Momentum vs time-of-flight
Scintillator planes energy deposition
BigBite wire chambers:optics and tracking
momentum reaction z
Conclusion Deuterium asymmetry: experiment and
theories (N-N potential theory) 3He asymmetry: theories but no
experiment Experimental apparatus
High resolution spectrometer (HRS) BigBite spectrometer Polarized 3He target
Analysis ongoing
Graduate StudentsG. Jin, University of Virginia
E. Long, Kent State UniversityM. Mihovilovič, Jožef Stefan Institute
Y. Zhang, Lanzhou University
Run CoordinatorsA. Camsonne, Jefferson Lab
P. Monaghan, Hampton UniversityS. Riordan, University of VirginiaB. Sawatzky, Temple UniversityR. Subedi, University of Virginia
V. Sulkosky, MITY. Qiang, Duke University
B. Zhao, College of William and Mary
S. GolgeO. Hansen
T. HolmstromJ. Huang
H. IbrahimE. JensenM. JonesH. KangJ. Katich
C. W. KeesP. King
J. LeRoseR. Lindgren
H. LuW. Luo
K. AlladaB. AndersonJ. R. M. AnnandW. BoeglinP. BradshawM. CananC. ChenR. De LeoX. DengA. DeurC. DuttaL. El FassiD. FlayF. GaribaldiH. GaoR. Gilman
P. MarkowitzM. MezianeR. Michaels
B. MoffitN. MuangmaH. P. Khanal
K. PanD. Parno
E. PiasetzkyP. Pradshaw
M. PosikA. J. R. Puckett
X. QianX. Qui
A. Saha
Thanks to the Hall A Quai-ElasticFamily Experiments
SpokespersonsT. Averett, College of William and Mary (E05-015, E08-05)
J. P. Chen, Jefferson Lab (E05-015)S. Gilad, MIT (E05-102)
D. Higinbotham, Jefferson Lab (E05-102, E08-005)X. Jiang, Rutgers University (E05-015)
W. Korsch, University of Kentucky (E05-102)B. E. Norum, University of Virginia (E05-102)
S. Sirca, University of Ljubljana (E05-102)V. Sulkosky, MIT (E08-005)
E05-015,E08-005,and E05-102
CollaborationF. Salvatore
M. ShabestariA. ShahinyanB. Shoenrock
J. St. JohnA. Tobias
W. TiremanG. M. Urciuoli
D. WangK. WangJ. Watson
B. WojtsekhowskiZ. Ye
X. ZhanX. Zheng
L. Zhu