The {pi}N interaction and 2{pi}-exchange three nucleon

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Bulletin of the American Physical Society

OSTI ID:375037

Murphy, D P; Coon, S A

The authors compare the {pi}N scattering amplitudes which underlie 2{pi}-exchange three-nucleon forces (TBFs) with the experimental {pi}N amplitudes. The amplitudes of the Tucson-Melbourne and Brazil TBFs when taken on-pion-mass-shell predict scattering lengths at threshold and phase shifts (slightly) above threshold which are in good agreement with the experimental amplitudes, except for the S-waves. Partial wave amplitudes from separable potentials, recently employed in a 2{pi}-TBF calculation, were continued below threshold, summed into invariant amplitudes, and compared with the experimental amplitudes in this kinematic region which is most relevant to the kinematics of TBFs. The separable potential invariant amplitudes, in contrast to those of TM and Brazil TBFs, do not compare well quantitatively with the experimental amplitudes in this region but have a similar qualitative behavior. The very small TBF effect in the triton of the separable potential amplitude appears to be due to the {pi}NN vertex function rather than the {pi}N amplitude self.

• OSTI ID: 375037
• Report Number(s): CONF-9304297--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 40; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
EXCHANGE INTERACTIONS
NUCLEI
PION-NUCLEON INTERACTIONS
THREE-BODY PROBLEM