Extraction of the {sup 1}S{sub 0} neutron-neutron scattering length from a kinematically-complete n-d breakup experiment at TUNL
- Triangle Universities Nuclear Laboratory, Box 90308, Durham North Carolina-27708-0308 (United States)
- 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, Vol. 475, Issue 1; Conference: 15.International conference on the application of accelerators in research and industry, Denton, TX (United States), 4-7 Nov 1998; Other Information: DOI: 10.1063/1.59243; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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