Radiative pion capture in 3He

Radiative pion capture in H2 , He3 , and Golak1, Skibiński2, Topolnicki3 et al. 2018Phys. Rev. C

“…In particular the so-called Panofsky ratio-that is, the ratio of the probabilities of the charge exchange π − + 3 He → π 0 + 3 H and radiative capture π − + 3 He → γ + 3 H reactions-was studied in many papers, as exemplified by Refs. [55,56]. An important paper by Truöl et al [57] not only brought new experimental data on the photon spectrum and several branching ratios but also corrections to the earlier theoretical predictions published in Refs.…”

“…The photon spectrum and the branching ratios from Ref. [57] were analyzed by Phillips and Roig [55]. Radiative breakup rates were calculated in the impulse approximation and FSI among the three nucleons was treated in the Amado model [60,61], by solving the Faddeev equations with a simple separable s-wave NN potential.…”

Photon Spectrum in Pion Capture on Tritium

“…The hydrogen isotopes are unique in the field of n"-capture studies, since the pions are exclusively absorbed from Is orbits. 5 Since the s -state radiative ir -capture transition rates can be calculated quite accurately 4 in the impulse approximation as well as with the approach using partial conservation of axial-vector current plus soft-pion theorems, 6 the measured branching ratios can be used together with the theoretical radiative rates to predict "experimental" strong absorption s level widths. These then are used to test assumptions of the two-nuclear absorption model, 4 the evaluation of which is particularly significant for the three-nucleon system.…”

Radiative pion capture in 2H, 3He and 3H

“…Studies of the (not only radiative) negative pion capture in the three-nucleon bound states were pioneered in 1952 by Messiah [6]. Further calculations [7][8][9][10][11][12][13][14][15] often concentrated on various branching ratios, because the measurements [16][17][18][19][20] yielded no absolute capture rates but relative probabilities of various reactions and, in some cases, photon spectra. * e-mail: jacek.golak@uj.edu.pl , 0…”

“…(201 E Web of Conferences https://doi.org/10.1051/e onf /201919905005 PJ pjc 199 9) MESON 2018 5005 Phillips and Roig [13,14] were the first to calculate radiative breakup rates for the π − + 3 He → γ+n+d, π − + 3 He → γ+n+n+p and π − + 3 H → γ+n+n+n processes. They treated final state interactions among the three nucleons within the Amado model [21,22], by solving the Faddeev equations with a simple separable s-wave nucleon-nucleon potential.…”