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Howell, C.R; Chen, Q; Carman, T.S; Hussein, A; Gibbs, W.R; Gibson, B.F; Mertens, G; Moore, C.F; Morris, C; Obst, A; Pasyuk, E; Roper, C.D; Salinas, F; Slaus, I; Sterbenz, S; Tornow, W; Walter, R.L; Whiteley, C.R; Whitton, M
Physics letters. B, 12/1998, Letnik: 444, Številka: 3Journal Article
We report a high-precision determination of the 1 S 0 neutron–neutron scattering length ( a nn ) using the 2H( π −, nγ) n reaction. The value obtained in the present work is −18.50± 0.05 (statistical) ± 0.44 (systematic) ± 0.30 (theoretical) fm, which is consistent with the values from previous measurements. Combining our result with previous measurements reduces the total uncertainty in the world average of a nn to ±0.4 fm, matching the accuracy to which the charge-symmetric parameter a pp is determined.
