Calculations indicate that the short-distance, spin and angular momentum independent 3 neutron force makes the dominant contribution at supra nuclear density. At nuclear density this manifests in a very strong (linear) correlation between the nuclear asymmetry energy and its derivative with respect to density. While the nuclear asymmetry energy is expected to be 32 +/- 2 MeV its derivative, related to the parameter called L, is poorly known. A precise experimental determination of the L would provide a stringent test of our model for 2 and 3 neutron interactions.
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