Toward a resolution of the neutron-neutron scattering-length issue (CROSBI ID 81925)
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Podaci o odgovornosti
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. ; Šlaus, Ivo ; Sterbenz, S. ; Tornow, W. ; Walter, R.L. ; Whiteley, C.R. ; Whitton, M.
engleski
Toward a resolution of the neutron-neutron scattering-length issue
We report a high-precision determination of the 1S0 neutron-neutron scattering length a(nn) using the 2He(pi ; n gamma) 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 avarage of a(nn) to +- 0.4 fm, matching the accuracy to which the charge-symmetric parameter a(pp) is determined.
E π -d three-nucleon force scattering length
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