The nn quasi-free nd breakup cross section: discrepancies to theory and implications on the 1S0 nn force - Nuclear TheoryReportar como inadecuado




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Abstract: Large discrepancies between quasi-free neutron-neutron nn cross sectiondata from neutron-deuteron nd breakup and theoretical predictions based onstandard nucleon-nucleon NN and three-nucleon 3N forces are pointed out.The nn 1S0 interaction is shown to be dominant in that configuration and has tobe increase to bring theory and data into agreement. Using the next-to-leadingorder NLO 1S0 interaction of chiral perturbation theory chiPT wedemonstrate that the nn QFS cross section only slightly depends on changes ofthe nn scattering length but is very sensitive to variations of the effectiverange parameter. In order to account for the reported discrepancies one mustdecrease the nn effective range parameter by about 12 % from its value impliedby 19charge symmetry and charge independence of nuclear forces.



Autor: H. Witala, W. Gloeckle

Fuente: https://arxiv.org/







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