1ST MEASUREMENT OF THE ELECTRIC FORMFACTOR OF THE NEUTRON IN THE EXCLUSIVE QUASI-ELASTIC SCATTERING OF POLARIZED ELECTRONS FROM POLARIZED HE-3

被引：195

作者：

MEYERHOFF, M

EYL, D

FREY, A

ANDRESEN, HG

ANNAND, JRM

AULENBACHER, K

BECKER, J

BLUMEWERRY, J

DOMBO, T

DRESCHER, P

DUCRET, JE

FISCHER, H

GRABMAYR, P

HALL, S

HARTMANN, P

HEHL, T

HEIL, W

HOFFMANN, J

KELLIE, JD

KLEIN, F

LEDUC, M

MOLLER, H

NACHTIGALL, C

OSTRICK, M

OTTEN, EW

OWENS, RO

PLUTZER, S

REICHERT, E

ROHE, D

SCHAFER, M

SCHEARER, LD

SCHMIEDEN, H

STEFFENS, KH

SURKAU, R

WALCHER, T

机构：

[1] UNIV MAINZ, INST KERNPHYS, W-6500 MAINZ, GERMANY

[2] UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND

[3] UNIV TUBINGEN, INST PHYS, W-7400 TUBINGEN 1, GERMANY

[4] ECOLE NORMALE SUPER, F-75231 PARIS 05, FRANCE

[5] UNIV MISSOURI, ROLLA, MO 65401 USA

来源：

PHYSICS LETTERS B | 1994年 / 327卷 / 3-4期

关键词：

D O I：

10.1016/0370-2693(94)90718-8

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A first measurement of the asymmetry in quasielastic scattering of longitudinally polarized electrons from a polarized He-3 gas target in coincidence with the knocked out neutron is reported. This measurement was made feasible by the cw beam of the 855 MeV Mainz Microtron MAMI. It allows a determination of the electric formfactor of the neutron G(E)n independent of binding effects a to first order. At Q2BAR = 0.31 (GeV/c)2 two asymmetries ABAR(parallel-to) (S(He) parallel-to q) and ABAR(perpendicular-to) (S(He) perpendicular-to q) have been measured giving ABAR(parallel-to) = (-7.40 +/- 0.73)% and ABAR(perpendicular-to) = (0.89 +/- 0.30)%. The ratio ABAR(perpendicular-to)/ABAR(parallel-to) is independent of the absolute value of the electron and target polarization and yields G(E)n = 0.035 +/- 0.012 +/- 0.005.

引用

页码：201 / 207

页数：7

共 30 条

[1] A LARGE-ACCEPTANCE IMAGING GAS CHERENKOV DETECTOR SYSTEM [J].