Toward a resolution of the neutron-neutron scattering-length issue

Authors
Howell, CR Chen, Q Carman, TS Hussein, A Gibbs, WR Gibson, BF Mertens, G Moore, CF Morris, C Obst, A Pasyuk, E Roper, CD Salinas, F Slaus, I Sterbenz, S Tornow, W Walter, RL Whiteley, CR Whitton, M
Citation
Cr. Howell et al., Toward a resolution of the neutron-neutron scattering-length issue, PHYS LETT B, 444(3-4), 1998, pp. 252-259
Citations number
27
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
03702693 → ACNP
Volume
444
Issue
3-4
Year of publication
1998
Pages
252 - 259
Database
ISI
SICI code
0370-2693(199812)444:3-4<252:TAROTN>2.0.ZU;2-O
Abstract
We report a high-precision determination of the S-1(0) neutron-neutron scat tering length (a(nn)) using the H-2(pi-,n gamma)n reaction. The value obtai ned in the present work is - 18.50 +/- 0.05(statistical) +/- 0.44(systemati c) +/- 0.30(theoretical) fm, which is consistent with the values from, prev ious measurements. Combining our result with previous measurements reduces the total uncertainty in the world average of a(nn) to +/-0.4 fm, matching the accuracy to which the charge-symmetric parameter a(pp) is determined. ( C) 1998 Elsevier Science B.V. All rights reserved.