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)
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-; ISSN 0094-243X; TRN: 9919M0021
- 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: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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