A NEW MEASUREMENT OF THE BETA-EMISSION ASYMMETRY IN THE FREE DECAY OF POLARIZED NEUTRONS

被引：79

作者：

SCHRECKENBACH, K

LIAUD, P

KOSSAKOWSKI, R

NASTOLL, H

BUSSIERE, A

GUILLAND, JP

机构：

[1] INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE

[2] LAB ANNECY LE VIEUX PHYS PARTICULES,F-74941 ANNECY LE VIEUX,FRANCE

来源：

PHYSICS LETTERS B | 1995年 / 349卷 / 04期

关键词：

FREE NEUTRON BETA DECAY; COLD POLARIZED NEUTRONS; BETA ASYMMETRY MEASUREMENT WITH A HELIUM-FILLED TPC; G(V) AND G(A) DEDUCED;

D O I：

10.1016/0370-2693(95)00228-D

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The beta asymmetry coefficient A(0) was measured in the free decay of polarized neutrons by means of a time projection chamber in coincidence with plastic scintillators. A value of A(0) = -0.1160(15) was measured and lambda = g(A)/g(V) = -1.266(4) deduced. Including recent results on the neutron lifetime the weak interaction coupling constants were determined as g(V) = 1.4172(34) X 10(-62) J m(3) and g(A) = -1.7944(20) X 10(-62) J m(3). The g(V) value is in excellent agreement with those from ft(0(+) --> 0(+)) and muon decay.

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页码：427 / 432

页数：6

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