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- Title
Role of the Total Isospin 3/2 Component in Three-Nucleon Reactions.
- Authors
Witała, H.; Golak, J.; Skibiński, R.; Topolnicki, K.; Epelbaum, E.; Hebeler, K.; Kamada, H.; Krebs, H.; Meißner, U.-G.; Nogga, A.
- Abstract
We discuss the role of the three-nucleon isospin $$T=3/2$$ amplitude in elastic neutron-deuteron scattering and in the deuteron breakup reaction. The contribution of this amplitude originates from charge-independence breaking of the nucleon-nucleon potential and is driven by the difference between neutron-neutron (proton-proton) and neutron-proton forces. We study the magnitude of that contribution to the elastic scattering and breakup observables, taking the locally regularized chiral N $$^4$$ LO nucleon-nucleon potential supplemented by the chiral N $$^2$$ LO three-nucleon force. For comparison we employ also the Av18 nucleon-nucleon potential combined with the Urbana IX three-nucleon force. We find that the isospin $$T=3/2$$ component is important for the breakup reaction and the proper treatment of charge-independence breaking in this case requires the inclusion of the $$^1S_0$$ state with isospin $$T=3/2$$ . For neutron-deuteron elastic scattering the $$T=3/2$$ contributions are insignificant and charge-independence breaking can be accounted for by using the effective t-matrix generated with the so-called $$``2/3-1/3"$$ rule.
- Subjects
PARTICLES (Nuclear physics); ISOBARIC spin; NEUTRON-deuteron interactions; SCATTERING (Physics); NEUTRON-proton interactions
- Publication
Few-Body Systems, 2016, Vol 57, Issue 12, p1213
- ISSN
0177-7963
- Publication type
Article
- DOI
10.1007/s00601-016-1156-3