Extraction of the {sup 1}S{sub 0} neutron-neutron scattering length from a kinematically-complete n-d breakup experiment at TUNL

Journal Article · Thu Jun 10 04:00:00 EDT 1999 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.59243· OSTI ID:21205561

Gonzalez Trotter, D E; Tornow, W; Howell, C R; Salinas, F; Walter, R L ^[1]; Witalea, H ^[2]

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1. Triangle Universities Nuclear Laboratory, Box 90308, Durham North Carolina-27708-0308 (United States)
2. Institute of Physics, Jagellonian University, PL-30059, Cracow (Poland)

The {sup 1}S{sub 0} neutron-neutron (nn) scattering length's currently accepted value (a{sub nn}=-18.6{+-}0.3 fm) is derived exclusively from two {pi}{sup -}-d capture-reaction experiments, in disagreement with the average -16.7{+-}0.5 fm extracted from kinematically-complete nd breakup experiments. This discrepancy may be due to deficiencies in the analyses of n-d breakup data and/or three-nucleon force (3NF) effects. A kinematically-complete n+d{yields}n{sub 1}+n{sub 2}+p breakup experiment at an incident neutron energy of 13.0 MeV was performed recently at TUNL. The value of a{sub nn} was extracted from the direct comparison of experimental and rigorously-calculated theoretical nd breakup differential cross sections at four production angles of the nn pair. Using modern nucleon-nucleon potential models in the three-nucleon cross-section calculations we obtained a{sub nn}=-18.7{+-}0.6 fm, in agreement with the {pi}{sup -}-d result. We found no significant effect due to 3NFs on our a{sub nn} value.

• OSTI ID: 21205561
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 475; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BREAKUP REACTIONS
CAPTURE
COMPARATIVE EVALUATIONS
DEUTERIUM TARGET
DEUTERONS
DIFFERENTIAL CROSS SECTIONS
MEV RANGE
NEUTRON REACTIONS
NEUTRON-NEUTRON INTERACTIONS
NEUTRONS
NUCLEON-NUCLEON POTENTIAL
PION MINUS REACTIONS
SCATTERING LENGTHS