Experimental Study of the Spin Structure of the Neutron (³He) at low Q²: a connection between the Bjorken and Gerasimov-Drell-Hearn Sum Rules

Thesis/Dissertation · Mon Oct 09 00:00:00 EDT 2000

DOI:https://doi.org/10.2172/776392· OSTI ID:776392

Deur, Alexander ^[1]

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1. Blaise Pascal Univ., Aubiere (France)

The authors have presented the motivations in gathering doubly polarized data in the quasi-elastic, resonance and DIS domains. These data were used to calculate the extended GDH integral. The comparison of this quantity with the spin dependent forward Compton amplitude $$\bar{S}$$₁ is of particular importance for the unification of the two strong interaction descriptions (nucleonic/hadronic vs. partonic) because $$\bar{S}$$₁ is the first quantity theoretically calculable in the full Q² domain of the strong interaction. Such a data taking was made possible because of three major technical achievements: (1) the beam of high duty cycle (100%), high current (up to 70 μA) and high polarization (70%); (2) the ³He target of high density (above 10 atm) with a polarization of 35% and a length of 40 cm; and (3) the large acceptance (6 msr) and high resolution (ΔP/P ≅ 10^-4) spectrometers. These features, available at Jefferson Lab, enabled them to achieve the highest luminosity in the world (about 10³⁶ s^-1 cm^-2 with a current of 15 μA) as far as polarized ³He targets are concerned. Consequently they were able to gather, in a rather short period of time (3 months), a large amount of data covering a large kinematical domain.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 776392
• Report Number(s): JLAB-PHY-01-07; DOE/ER/40150-1819; TRN: US0102591
• Resource Relation: Other Information: TH: Thesis; No thesis information supplied; PBD: 9 Oct 2000
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
HELIUM 3 TARGET
BEAM LUMINOSITY
NEUTRONS
POLARIZATION
RESOLUTION
SPIN
STRONG INTERACTIONS
SUM RULES
CEBAF ACCELERATOR