New measurement of the S-1(0) neutron-neutron scattering length using the neutron-proton scattering length as a standard

Authors
Trotter, DEG Salinas, F Chen, Q Crowell, AS Glockle, W Howell, CR Roper, CD Schmidt, D Slaus, I Tang, H Tornow, W Walter, RL Witala, H Zhou, Z
Citation
Deg. Trotter et al., New measurement of the S-1(0) neutron-neutron scattering length using the neutron-proton scattering length as a standard, PHYS REV L, 83(19), 1999, pp. 3788-3791
Citations number
19
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
83
Issue
19
Year of publication
1999
Pages
3788 - 3791
Database
ISI
SICI code
0031-9007(19991108)83:19<3788:NMOTSN>2.0.ZU;2-C
Abstract
This paper reports high-accuracy cross-section data taken for identical kin ematic conditions of the neutron-proton (np) and neutron-neutron (nn) final -state interactions in the H-2(n,nnp) reaction at an incident mean neutron energy of 13.0 MeV. These data were analyzed with rigorous three-nucleon ca lculations to determine the S-1(0) np and nn scattering lengths, a,, and a, ,. Our results are a(nn) = -18.7 +/- 0.6 fm and a(np) = -23.5 +/- 0.8 fm. T he value obtained for a(nn) in the present work is in agreement with that f rom pi(-)d measurements but disagrees with values obtained from earlier neu tron-deuteron breakup studies.