Small-Angle Cross Sections for the Scattering of Protons by Tritons

Three-Nucleon Force in the 4He Scattering System

“…Comparison of the 0 + triton-proton phase shifts from the R-matrix analysis (crosses) and calculations employing AV18 in the small model space (av18), adding negative parity distortion channels (av18n), for the large model space (av18-l) and adding negative parity distortion channels (av18n-l) R-matrix analysis cannot fully reproduce the data in the Coulomb-nuclear interference region. The data from [23] seem to be consistently above those from [21] and [22]. In the Coulomb-nuclear interference the sensitivity to TNI is very large, whereas around the (p,n) threshold data, R-matrix and microscopic calculations agree essentially.…”

Cross-section for proton–tritium scattering from 1.4 to 3.4MeV at the laboratory angle of 165°

“…2, and also given in Table 1. We present comparisons between the current data and some of those available in the literatures [6,9]. The scattering angle in Classen's measurements is 163.17°, which is almost the same as used in our measurements.…”

“…The scattering angle in Classen's measurements is 163.17°, which is almost the same as used in our measurements. In [6,9] tritium gas targets enclosed in the experimental chamber using entrance and exit foil windows were used. This implies not only an energy dispersion of the beam induced by passing the foils separating the gas from the high vacuum line, but also some divergence in the angle of incidence of the beam.…”

“…However, accurate knowledge of the elastic scattering cross-section for the incident protons interacting with the tritium is required. In previous works [6,9], cross-sections for the interaction of p with T in some energy ranges and angles, have been measured. However, very little data exist in the energy range 1-3 MeV and at laboratory angles of around 165°.…”

A coupled-channels treatment of the positive-parity resonances in4He

“…Apart from the energy and width, there is also the important question of whether a given theory can satisfactorily predict the intensity for this resonance in various reaction channels. As far as the 3H(p,p) channel is concerned, a reliable test would be to compare the calculated differential cross section with that observed [28] in its vicinity. We prefer, however, to delay this discussion till the next section where it will be done together with the J = 1 § resonance.…”