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The spin asymmetry in deep inelastic scattering of longitudinally polarised muons by longitudinally polarised protons has been measured in the range 0.01<×<0.7. The spin dependent structure function g 1 ( x ) for the proton has been determined and, combining the data with earlier SLAC measurements, its integral over x found to be 0.126±0.010(stat.)±0.015(syst.), in disagreement with the Ellis-Jaffe sum rule. Assuming the validity of the Biorken sum rule, this result implies a significant negative value for the integral of g 1 for the neutron. These integrals lead to the conclusion, in the naïve quark parton model, that the total quark spin constitutes a rather small fraction of the spin of the nucleon. Results are also presented on the asymmetries in inclusive hadron production which are consistent with the above picture.

7 data tables

Table 1

THE MEAN Q**2 FOR EACH OF THE 10 VALUES OF X BELOW ARE 3.5,4.5,6.0, 8.010.3,12.9,15.2,18.0,22.5,29.5.

Table 2

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Table 3

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Polarization of cumulative protons in the reaction gamma A --> p X.

Avakian, R.O. ; Avetisian, A.E. ; Arestakesian, G.A. ; et al.

Sov.J.Nucl.Phys. 49 (1989) 292-294, 1989.

Inspire Record 284675 DOI 10.17182/hepdata.17336

None

2 data tables

Table 1

No description provided.

Table 2

No description provided.

MEASUREMENT OF THE POLARIZATION OF CUMULATIVE PROTONS IN gamma A ---> p X REACTION

Avakian, R.O. ; Avakian, E.O. ; Avetisian, A.E. ; et al.

Yad.Fiz. 42 (1985) 667-670, 1985.

Inspire Record 210380 DOI 10.17182/hepdata.17606

None

1 data table

Table 1

Axis error includes +- 7/7 contribution.

MEASUREMENT OF ASYMMETRY IN CROSS-SECTION OF GAMMA P ---> P PI0 REACTION IN THE RESONANCE REGION. (IN RUSSIAN)

Avakian, R.O. ; Avetisian, A.E. ; Bagdasaryan, A.S. ; et al.

Yad.Fiz. 38 (1983) 1196-1198, 1983.

Inspire Record 200187 DOI 10.17182/hepdata.17731

None

1 data table

Table 1

Axis error includes +- 0.0/0.0 contribution (?////DUE TO ERRORS IN PHOTON POLARIZATION).

MEASUREMENT OF THE ASYMMETRY OF THE REACTION gamma p ---> p pi0 CROSS-SECTION FOR PION PRODUCTION ANGLES IN CMS 65-degrees TO 80-degrees IN THE RESONANCE ENERGY RANGE

Avakian, R.O. ; Bagdasaryan, A.S. ; Vartapetian, G.A. ; et al.

Sov. J. Contemp. Phys. 19 ( 1984) No. 1 46-48. ( Izv. Akad. Nauk Arm. SSR 19 ( 1984) No. 1 50-53) and Erevan Phys. Inst. - EFI-674(64)-83 (83,REC.JAN.84) 13p, 1983.

Inspire Record 195991 DOI 10.17182/hepdata.18465

None

3 data tables

Table 1

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Table 2

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Table 3

No description provided.