No abstract available

[en] The elastic scattering for a light nuclear system ³He - α is analysed within the Generating Coordinates Method using a procedure formulated by Piza and Passos. The same numerical technique is used to describe the bond states and scattering properties. (A.C.A.S.)

No abstract available

[en] The absorption channel in π-³He collisions is investigated. Amplitudes are derived for the pion-induced breakup of the target into both two clusters and three free nucleons. We employ elementary absorption mechanisms of one- and two-body type, which are presently considered to be important for the description of π-nucleus collisions from the low-energy region up to the region dominated by the Δ resonance. We put the major emphasis on the few-body aspects of the process, such as the three-nucleon dynamics in the final state, and the initial-state breakup of the bound nuclear system in presence of the pion. On the other hand, we neglect pion-nucleus correlations in the initial state, which would entail a complete four-body treatment of the process. For both one- and two-body elementary absorption, the full amplitudes are explicitly represented through quasiparticle (Sturmian) expansions. The entire set of graphs corresponding to the present model is given and discussed

No abstract available

No abstract available

No abstract available

[en] This paper describes a proposed experiment to detect high energy photons from radiative muon capture on helium-3 using a large acceptance pair spectrometer. The target will consist of 2 liters of liquid helium-3. The negative muons from TRIUMF channel M9 will be stopped in the target. The few muons that undergo radiative capture will produce a photon spectrum which is the sum of the individual spectra from the reactions

No abstract available

[en] The differential coincident pion electroproduction cross section in the ³He(e,e^')π⁺)³H reaction has been measured with the high resolution three-spectrometer facility at the Mainz Microtron MAM1. Two kinds of measurements were performed: for fixed four-momentum transfers Q² = 0.045 (0.1)(GeV/c)² with the pions detected in parallel kinematics, the incident energy was varied between 555 and 855 MeV in order to enable a separation of the longitudinal and transverse structure functions. In the second case the pion emission angle with respect to the momentum transfer direction was varied over a large range at fixed incident energy E₀ = 855 MeV and fixed four-momentum transfers Q² = 0.045 (0.1)(GeV/c)². From the angular distributions the LT interference term can be extracted. The experimental data are compared to model calculations assuming standard Born amplitudes, including Δ and higher resonance terms and accounting for the final state interaction of the outgoing pion. The effects of medium modifications of the Δ and of the pion are discussed