Abstract/Details

The spin structure of the neutron


1998 1998

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Abstract (summary)

A description of SLAC experiment E154, a precision measurement of the neutron's longitudinal spin structure function $g\sbsp{1}{n},$ is presented. Deep inelastic electron scattering was used to measure the structure function in the kinematic range $0.014<x<0.7,$ and $1<Q\sp2<17$ GeV$\sp2.$ A measurement of the transverse spin structure function $g\sbsp{2}{n}$ was also made, but with significantly lower statistical precision. Electrons with an average polarization of $82\pm2$% and an energy of 48.3 GeV were scattered off polarized $\sp3$He nuclei having an average polarization of 38%. Two independent magnetic spectrometers set at scattering angles of 2.75$\sp\circ$ and 5.5$\sp\circ$ were used to acquire about 100 million events during a two month run in late 1995. The data were analyzed to yield the integral over the measured region: $\int\sbsp{0.014}{0.7}\ g\sbsp{1}{n}(x)dx=$ ${-}$0.036 $\pm$ 0.004(stat) $\pm$ 0.005(syst), which is several standard deviations below the Ellis-Jaffe sum rule predictions. When these data were combined with the proton $g\sbsp{1}{p}$ structure function data from the SMC and E143 experiments, the Bjorken sum rule over the measured x range was found to be within 10% of the predicted value. The integral of the $g\sbsp{2}{n}$ data, dominated by the statistical uncertainty, was found to be $\int\sbsp{0.014}{0.7}\ g\sbsp{2}{n}(x)dx=$ 0.19 $\pm$ 0.17(stat) $\pm$ 0.02(syst), in agreement with the Burkhardt-Cottingham sum rule prediction. The $g\sbsp{1}{n}$ structure function data at low x were found to be inconsistent with the traditional asymptotic forms, bringing into question the methods used in the past.

Indexing (details)


Subject
Particle physics
Classification
0798: Particle physics
Identifier / keyword
Pure sciences, Bjorken sum rule, deep inelastic scattering
Title
The spin structure of the neutron
Author
Churchwell, Steven T.
Number of pages
174
Publication year
1998
Degree date
1998
School code
0118
Source
DAI-B 59/02, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780591758498, 0591758490
Advisor
Peterson, Gerald A.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9823726
ProQuest document ID
304431068
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304431068
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