v 2 1 5 O ct 1 99 8 Elastic Scattering of Pions From the Three - nucleon System
نویسندگان
چکیده
We examine the scattering of charged pions from the trinucleon system at a pion energy of 180 MeV. The motivation for this study is the structure seen in the experimental angular distribution of back-angle scattering for π +-3 He and π −-3 H but for neither π −-3 He nor π +-3 H. We consider the addition of a double spin flip term to an optical model treatment and find that, though the contribution of this term is non-negligible at large angles for π +-3 He and π −-3 H, it does not reproduce the structure seen in the experiment.
منابع مشابه
v 1 1 4 O ct 1 99 8 ROUGH DRAFT Elastic Scattering of Pions From the Three - nucleon System
We examine the scattering of charged pions from the trinucleon system at a pion energy of 180 MeV. The motivation for this study is the structure seen in the experimental angular distribution of back-angle scattering for π +-3 He and π −-3 H but for neither π −-3 He nor π +-3 H. We consider the addition of a double spin flip term to an optical model treatment and find that, though the contribut...
متن کاملar X iv : n uc l - th / 9 41 00 29 v 1 1 8 O ct 1 99 4 Application of Multiple Scattering Theory to Lower Energy Elastic Nucleon - Nucleus Reactions
The optical model potentials for nucleon-nucleus elastic scattering at 65 MeVtiple scattering theory, following the prescription of the spectator expansion, where the only inputs are the free NN potentials, the nuclear densities and the nuclear mean field as derived from microscopic nuclear structure calculations. These potentials are used to predict differential cross sections, analyzing power...
متن کامل/ 97 04 41 5 v 1 2 8 A pr 1 99 7 Elastic π N Scattering to O ( p 3 ) in Heavy Baryon Chiral Perturbation Theory ∗
The elastic πN scattering amplitude in the isospin limit is calculated in the framework of heavy baryon chiral perturbation theory, up to the third order. Threshold parameters like scattering lengths, volumes, effective ranges, etc. are compared with data. All relevant low energy constants are fixed from the available pion-nucleon data. A clear improvement in the description of data is observed...
متن کاملar X iv : n uc l - th / 9 90 60 77 v 1 2 5 Ju n 19 99 NUCLEON - NUCLEON SCATTERING IN EFFECTIVE FIELD
I outline the effective field theory (EFT) calculation of nucleon-nucleon scattering which was recently carried out to next-to-next-to-leading order (NNLO) by Noam Shoresh and myself. In this calculation only potential pion contributions are included. These are the leading contributions from pions. A toy model was also considered in which potential pions are the only pion effects. The effective...
متن کاملO ct 1 99 4 SUNY - NTG - 94 - 54 October 1994 WHERE THE NUCLEAR PIONS ARE
Three recent experiments, which looked at pionic effects in nuclei have concluded that there are no excess pions. This puts into serious question the conventional meson-exchange picture of the nucleon-nucleon interaction. Based on arguments of partial restoration of chiral symmetry with density we propose a resolution to this problem.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1998