Cross-section measurements of at intermediate energies

Simultaneous measurements of the reactions

“…The data definitely show a dependence on the beam momenta. This is in contrast to the conjecture by Silverman et al [17] that the invariant matrix element squared is independent of the beam energy which, by the way, is not supported by any theory.…”

“…The deduced isospin ratio of 1.64 up to 1.89 for the differential cross sections is smaller than the one found by Silverman et al [17] of 2.36±0.11. The measured ratio of the matrix elements squared for the two lower beam momenta of 2.03 ± 0.02 is in agreement with the result R = 2.13 ± 0.13 obtained by Harting et al [15] at a beam energy of 591 MeV.…”

“…[39]). Such elimination of the phase-space factor from the data should lead to a more rigourous result as was pointed out by Silverman et al [17]. The ratio of the matrix elements squared are 2.06 ± 0.06, 2.02 ± 0.03 and 1.73 ± 0.04 for the same total energy s, 1.95 ± 0.04 and 1.98 ± 0.04 for the same p cm π , and 1.87 ± 0.03 and 2.08 ± 0.01 for the same η-values.…”

“…This principal advantage is lost when the detector does not allow simultaneous measurements as in Ref. 's [14][15][16][17]. Furthermore, these studies are restricted to only a few (up to 4) angles.…”

Pion absorption in tritium at intermediate energies

“…No disagreement can be found. At T =206 MeV our results are compared with the results of Silverman et al [42] (open squares) for the inverse reaction, which were measured at T = 196 MeV. For large angles there seems to be a discrepancy, whereas the agreement at smaller nucleon emission angles is good.…”