The elastic scattering of 162-MeV ..pi../sup +/ and ..pi../sup -/ /sup 9/Be, Si, /sup 5/8Ni and /sup 2/08Pb have been measured. All angular distributions, except for /sup 9/Be, exhibit strong diffraction patterns. Optical-model calculations with matter distributions deduced from electron scattering qualitatively reproduce the data, but better agreement for all but /sup 9/Be can be obtained with suitable modifications. No substantial differences in neutron- and proton-matter radii are indicated.

Elastic-scattering of 162 mev pions by nuclei

Final state interactions are an important component of any neutrino-nucleus Monte Carlo program. GENIE has 2 FSI programs which serve different purposes. Each has fair-good agreement with a wide range of hadron-nucleus data. Recent improvements and planned advancements are described.

GENIE final state interactions

Results are presented from analyzing the yields of protons (p), deuterons (d), and tritons (t) in pre-equilibrium stopped pion absorption reactions. Phenomenological formulas are proposed for describing the mass-number (A) dependences of these yields accurate to within 10–20% in the mass-number range of 6 < A < 209 (59 < A < 209 for t). The final results do not contradict the hypothesis that the predominant role in the formation of deuterons and tritons is played by pick-up on the surface of nuclei.

Formation of hydrogen isotopes in reactions of stopped pion absorption

The pion-nucleus elastic scattering and reaction cross-section data at incident energies below, atop and above the Δ-resonance are analyzed using the full Klein-Gordon equation using an optical potential. Analytic forms of the potential are determined using the inverse scattering theory in those cases where phase shift analyses were available. The Coulomb effect is incorporated using Stricker’s prescription. Both elastic scattering data and the reaction cross sections between 120 and 400 MeV are well reproduced. Both real and imaginary parts of the potential are local. The potential points determined by the inverse scattering theory in the interior region at 230 MeV clearly establish that the real part is repulsive. This remains the case at higher incident energies. The real part turns repulsive above the resonance, whereas the imaginary part reflects the dominance of surface absorption, which is maximum near atop the Δ-resonance and then falling off at higher energies.

/pdf/reaction-cross-section-data-below-atop-and-above-the-d-4i7l9cqf51.pdf

Reaction Cross-Section Data Below, Atop and Above the Δ-Resonance

A new
updated simple local optical potential is proposed for analyzing low-energy π--12C elastic
scattering data at 80 MeV and below. This potential is composed of two real
terms and an imaginary term. The nature of the real part of the potential is
repulsive at smaller radii and attractive at larger ones. In fact, the height
of the repulsive term is found to change linearly with the incident pion
kinetic energy. On the other hand, the imaginary part of the potential is
attractive, shallow and non-monotonic with a dip at about 1.6 fm. Such a nature of the potential
makes it feasible to predict π--12C
cross sections at other energies in the energy region considered herein.
Coulomb effects are incorporated by following Stricker’s prescription. This
study will serve positively in studying both pionic atoms and the role of negative
pions in radiotherapy.

/pdf/analyses-of-low-energy-p-12-c-elastic-scattering-data-2zc9avufie.pdf

Analyses of Low-Energy π - - 12 C Elastic Scattering Data

Recent developments in the investigation of pion-nuclear scattering at low energy and in the region of the 3.3 resonance are reviewed. The emphasis is on approaches which are on a microscopic level as far as the treatment of higher order many-body corrections to lowest order multiple scattering expansions are concerned. The importance of pion absorption and production in few-nucleon systems (D, 3He, 3H) to obtain information about basic reaction mechanisms is emphasised. Calculations of π-nuclear elastic scattering based on microscopic many-body schemes will be summarized.

Pion-Nucleus Interactions

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Pion-Nucleus Interactions