New investigation of the neutron-neutron and neutron-proton final-state interaction in the n-d breakup reaction - art. no. 014003

Citation
V. Huhn et al., New investigation of the neutron-neutron and neutron-proton final-state interaction in the n-d breakup reaction - art. no. 014003, PHYS REV C, 6301(1), 2001, pp. 4003
Citations number
45
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW C
ISSN journal
0556-2813 → ACNP
Volume
6301
Issue
1
Year of publication
2001
Database
ISI
SICI code
0556-2813(200101)6301:1<4003:NIOTNA>2.0.ZU;2-C
Abstract
The neutron-neutron final-state interaction (FSI) has been investigated in the H-2(n,np)n reaction at 25.3 and 16.6 MeV, detecting neutrons and proton s in coincidence in a geometry which should enable a practically model-inde pendent determination of the S-1(o) neutron-neutron scattering length a(nn) . The analysis was performed by means of detailed Monte Carlo simulations b ased on rigorous three-body calculations with realistic nucleon-nucleon pot entials. At 25.3 MeV, the value of a,, deduced from the absolute cross sect ion in the FSI peak is - -16.3+/-0.4 fm while the relative cross section, n ormalized in the region of neutron-proton quasifree scattering, gives - 16. 1+/-0.4 fm. The relative data obtained at 16.6 MeV yielded a(nn) = - 16.2+/ -0.3 fm. In addition, the S-1(o) neutron-proton scattering length was measu red at 25.2 MeV in the same configuration for comparison. While our results for a(nn) are incompatible with those of a similar investigation performed recently at 13 MeV where the two neutrons were detected, both results for a(np) are in good agreement with the accurately known value from free n-p s cattering.