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

Journal Article · Tue Jun 01 04:00:00 EDT 1999 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.59243· OSTI ID:698872

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

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1. Triangle Universities Nuclear Laboratory, Box 90308, Durham North Carolina-27708-0308 (United States)

The {sup 1}S{sub 0} neutron-neutron ({ital nn}) scattering length{close_quote}s currently accepted value (a{sub nn}={minus}18.6{plus_minus}0.3&hthinsp;fm) is derived exclusively from two {pi}{sup {minus}}-d capture-reaction experiments, in disagreement with the average {minus}16.7{plus_minus}0.5&hthinsp;fm extracted from kinematically-complete {ital nd} breakup experiments. This discrepancy may be due to deficiencies in the analyses of n{minus}d breakup data and/or three-nucleon force (3NF) effects. A kinematically-complete n+d{r_arrow}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 {ital nd} breakup differential cross sections at four production angles of the {ital nn} pair. Using modern nucleon-nucleon potential models in the three-nucleon cross-section calculations we obtained a{sub nn}={minus}18.7{plus_minus}0.6&hthinsp;fm, in agreement with the {pi}{sup {minus}}-d result. We found no significant effect due to 3NFs on our a{sub nn} value. {copyright} {ital 1999 American Institute of Physics.}

• Sponsoring Organization: USDOE
• DOE Contract Number: FG02-97ER41033
• OSTI ID: 698872
• Report Number(s): CONF-981122--
• 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

66 PHYSICS
BREAKUP REACTIONS
DEUTERIUM TARGET
DEUTERONS
NEUTRON REACTIONS
NEUTRON-NEUTRON INTERACTIONS
NEUTRONS
PROTONS
SCATTERING LENGTHS