He3Polarization Measurements and Phase Shifts forp-

Abstract

This paper reports further measurements for the elastic scattering of protons by polarized 'He in the 4 -11. -MeV range. A phase-shift analysis based on cross-section, polarization, and spin-correlation data is presented, and the precision with which some of the parameters are determined is discussed.

Radiative Proton Capture on 3 H at Astrophysical Energies and Its Role in the Initial Stage of Star Formation

“…1b by the solid line and the experimental data of works [24][25][26][27][28][29] are given in this figure too. ISSN 1991-346X Table 2 -The singlet potentials of the form (2) for p 3 He scattering, pure with respect to isospin T = 1 [17,18] [24], squares [25], and triangles [26] Fig. 1b -Singlet 1 P phase shift of p 3 He elastic scattering.…”

“…In this approach we assume that pure phase shifts with isospin Т = 1 in p 3 H system can be matched to phase shifts with Т = 1 for p 3 He channel [17,18]. Therefore p 3 He system at Т z = 1 is pure by isospin with Т = 1, so the pure by isospin phase shifts of p 3 H scattering with Т = 0 are extracted from expression (1) on the basis of the known pure scattering phase shifts with Т = 1 for p 3 He system [24][25][26][27][28][29] and for mixed p 3 H with isospin with Т = 0 and 1 [30][31][32]. Furthermore, the corresponded pure potentials of p 3 H interaction are constructed on their basis, for example, for the GS of 4 He in p 3 H channel [17,18].…”

“…with the point-like coulomb term. This potential, as for p 2 H system [11], is constructed so that to correctly describe correspondent partial phase shift of p 3 He elastic scattering [24][25][26][27][28][29]. Consequently, the pure with respect to isospin T = 1 potentials of p 3 He interactions for the elastic scattering processes were obtained, and their parameters are listed in Table 2 [17,18].…”

“…The singlet and pure with respect to isospin S phase shift of p 3 He elastic scattering, used later for calculation of the singlet p 3 H phase shifts with the isospin T = 0, is shown by the solid line in Fig. 1a together with the experimental data from works [24][25][26].…”

“…Therefore, there are several different variants of the phase shift analysis of p 3 He elastic scattering, for example [24][25][26][27][28][29], so the parameters of the potential for the singlet 1 P 1 and the triplet 3 P 1 waves given in the Table 2 are chosen in order to receive a certain compromise between different results. The singlet 1 P 1 phase shift of the elastic p 3 He scattering with T = 1 used in our calculations of the E1 transition to the ground state of 4 He in p 3 H channel with T = 0 is shown in Fig.…”