Potential model analysis of low energyH2(d,γ)4

Manifestations of the D-State in Light Nuclei

“…78 fm and a = 0.5 fm were used. The scattering states were generated using the potentials of Bliige et al (100), which were shown to reproduce the reson ating group model phase shifts of Chwieroth et al (97). Although the quantitative agreement is not impressive, the trend of Ay(E) is contained in the model.…”

“…However, detailed studies of calculations of this type have shown that such results are probably unre liable (100). Bliige et al (100) fo und that the results for S-wave capture into the D-state of 4He, which is the dominant strength below Ed '" 200 keV, are very sensitive to the parametrization of the nucleus-nucleus poten tial. In particular, they showed that slight variations in the parameters of the Woods-Saxon potential model parameters can lead to drastic changes in the calculated cross sections for incoming S-waves making E2 transitions to the D-state of4He.…”

“…While the importance of the deuteron D-state to the calculation of the low-energy 2H(d,y)4He cross section has been emphasized by this calculation, its results cannot be given quantitative significance. The use of a potential model has already been shown to be unreliable (100) . Other effects such as non-E2 radiation and rearrangement eHe + n and 3H + p) components of the continuum wave fu nction were ignored.…”

Photon polarization in theHe4(γ,d→)2<

“…Here we want to consider the combined possibilities of using polarized radiation as well as polarized deuterons in the treatment of the He(y, d) H reaction or its time reversed capture counterpart. For this reason we present our own formalism, (6) where 'Here a caret over a scalar quantity, e.g., L, stands for $2L+ I, while over a vector quantity, e.g., q, it represents a unit vector. …”

“…In addition, the work of Bliige, Assenbaum, and Langanke [6] demonstrated that it is essentially impossible to extract reliable information on the He ground state by using simple potential models of structureless deuterons to describe the capture reaction. The most ambitious theoretical treatment so far is the multichannel resonating group calculation of Wachter, Mertelmeier, and Hofmann [7] However, that work did not consider D-wave components in any of the fragments and so, based on the warning from Ref.…”