Production and knockout of nucleon isobars from helium by 5 GeV pions

Using both recoil and fast-particle spectrometers, the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}+^{4}\mathrm{He}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}+^{3}\mathrm{H}+x$ has been measured for triton momenta in the region 0.24-0.60 GeV/c. The experimental spectra are presented as functions of triton momentum and angle and of mass of the unmeasured object. In the theoretical analysis it is assumed that the final state can be reached via quasielastic scattering from ${N}^{*}^{3}\mathrm{H}$ states and via ${N}^{*}$ productions from the $p^{3}\mathrm{H}$ state of helium. The most credible of three investigated $p^{3}\mathrm{H}$ wave functions requires one percent of ${N}^{*}^{3}\mathrm{H}$ states in the mass range 1.08-1.80 GeV/${\mathit{c}}^{2}$.NUCLEAR REACTIONS $^{4}\mathrm{He}({\ensuremath{\pi}}^{\ensuremath{-}},{\ensuremath{\pi}}^{\ensuremath{-}}x)t$, $E=5$ GeV, ${E}_{t}g10$ MeV measured $\ensuremath{\sigma}({\ensuremath{\theta}}_{t},{m}_{x})$, $\ensuremath{\sigma}({m}_{x},{E}_{t})$, $\ensuremath{\sigma}({m}_{x},{\ensuremath{\theta}}_{t})$; deduced $p\ensuremath{-}t$ wave-$f$, $x\ensuremath{-}t$ prob. $1.1l{m}_{x}l1.8$ GeV. $p({\ensuremath{\pi}}^{\ensuremath{-}},{\ensuremath{\pi}}^{\ensuremath{-}})x$, $E=5$ GeV, measured $\ensuremath{\sigma}({m}_{x})$.