Precision Determination of the Neutron Spin Structure Function {ital g}{sup {ital n}}{sub {ital 1}}

Journal Article · Tue Jul 01 00:00:00 EDT 1997 · Physical Review Letters

OSTI ID:628689

Arnold, R G; Bosted, P E; Fellbaum, J N; Reyna, D; Rock, S E; Sorrell, L; Szalata, Z M; Toole, T ^[1]; Shapiro, G ^[2]; Breton, V; Fonvieille, H; Incerti, S ^[3]; Meyer, W ^[4]; Averett, T; Hughes, E W ^[5]; Borel, H; Lombard-Nelsen, R; Marroncle, J; Sabatie, F; Staley, F ; Terrien, Y ^[6]; Anderson, B D; Khayat, M; Manley, D M; Olson, M; Petratos, G G; Watson, J W; Zhang, W ^[7]; Ghazikhanian, V; Igo, G ^[8]; Berisso, C M; Churchwell, S; Hicks, R S; Kolomensky, Y G; Peterson, G A; Shaw, J ^[9]; Chupp, T E; Coulter, K P; Smith, T B; Welsh, R C ^[10]; Thompson, A K ^[11]; Miller, D ^[12]; Kuhn, S E; Raue, B; Wesselmann, F ^[13]; Raines, P ^[14]; Bogorad, P; Cates, G D; Kumar, K; Romalis, M V ^[15]; Marvin, T ^[16]; Decowski, P ^[17]; Akagi, T; Anthony, P L; Buenerd, M J; Daoudi, M; Erickson, R; others, and

---

1. American University, Washington, D.C. 20016 (United States)
2. University of California, Berkeley, California 94720 (United States)
3. LPC IN2P3/CNRS, Univ. Blaise Pascal, F-63170 Aubiere Cedex (France)
4. University of Bonn, Nussallee 12, D-5300 Bonn (Germany)
5. California Institute of Technology, Pasadena, California 91125 (United States)
6. DAPNIA, Saclay, 91191 Gif-sur-Yvette Cedex (France)
7. Kent State University, Kent, Ohio 44242 (United States)
8. University of California, Los Angeles, California 90024-1547 (United States)
9. University of Massachusetts, Amherst, Massachusetts 01003 (United States)
10. University of Michigan, Ann Arbor, Michigan 48109 (United States)
11. National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
12. Northwestern University, Evanston, Illinois 60201 (United States)
13. Old Dominion University, Norfolk, Virginia 23529 (United States)
14. University of Pennsylvania, Philadelphia, Pennsylvania 19104-6317 (United States)
15. Princeton University, Princeton, New Jersey 08544 (United States)
16. Southern Oregon State College, Ashland, Oregon 97520 (United States)
17. Smith College, Northampton, Massachusetts 01063 (United States)

We report on a precision measurement of the neutron spin structure function g{sup n}{sub 1} using deep inelastic scattering of polarized electrons by polarized {sup 3}He . For the kinematic range 0.014{lt}x{lt}0.7 and 1{lt}Q{sup 2}{lt}17(GeV /c){sup 2} , we obtain {integral}{sub 0.014}{sup 0.7}g{sup n}{sub 1}(x)dx={minus}0.036{plus_minus}0.004(stat){plus_minus}0.005(syst) at an average Q{sup 2}=5(GeV/c){sup 2}. We find relatively large negative values for g{sup n}{sub 1} at low x . The results call into question the usual Regge theory method for extrapolating to x=0 to find the full neutron integral {integral}{sub 0}{sup 1}g{sup n}{sub 1}(x)dx, needed for testing the quark-parton model and QCD sum rules. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 628689
• Journal Information: Physical Review Letters, Vol. 79, Issue 1; Other Information: PBD: Jul 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
NEUTRONS
STRUCTURE FUNCTIONS
ELECTRON REACTIONS
HELIUM 3 TARGET
SPIN
DEEP INELASTIC SCATTERING
POLARIZED BEAMS
POLARIZED TARGETS
REGGE CALCULUS
QUARK MODEL
QUANTUM CHROMODYNAMICS
SUM RULES