Polarized and unpolarized proton capture on deuterium

King, S.E.; Roberson, N. R.; Weller, H. R.

doi:10.1103/physrevc.30.21

Cited by 12 publications

(21 citation statements)

References 10 publications

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“…Despite the various corresponding investigations, the theory is only in rough agreement with experiment, and there are inconsistencies between the data up to 30% in the magnitudes of the cross sections. The experimental results by Belt et al [1] and King et al [2,3] are in good agreement. Those by Matthews et al [4] and Skopik et al [5] agree in the angular distributions, but disagree in the magnitudes of the cross sections.…”

supporting

confidence: 78%

“…The total cross section is obtained by integrating over the angle θ between the incoming photon and the outgoing proton Figure 1 shows the total cross sections for the Paris, the Bonn A and Bonn B potentials compared to the experimental data [1][2][3][4][5]. There is a small potential dependence of σ and, hence, of A 0 similar to the one observed in the corresponding photoprocess [13,14].…”

mentioning

confidence: 90%

“…With this number of channels a converged calculation was achieved, incorporating 99.8% of the wave functions. [1][2][3][4]. The data set by Matthews et al [4] has been renormalized with the A0 from King et al [2,3].…”

mentioning

confidence: 99%

“…In the calculations by Gibson and Lehman [7] a more realistic Yamaguchi interaction, but only the E1 components were employed. King et al [2] performed an effective two-body, direct capture calculation with the initial state being treated as a plane wave, or as a scattering state generated from an optical potential. Fonseca and Lehman [8] calculated the polarization observables A yy and T 20 at the excitation energy E x = 14.75 MeV including only the E1 interaction.…”

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confidence: 99%

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Radiative capture of protons by deuterons

Schadow

Sandhas

1999

Phys. Rev. C

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The differential cross section for radiative capture of protons by deuterons is calculated using different realistic NN interactions. We compare our results with the available experimental data below Ex = 20 MeV. Excellent agreement is found when taking into account meson exchange currents, dipole and quadrupole contributions, and the full initial state interaction. There is only a small difference between the magnitudes of the cross sections for the different potentials considered. The angular distributions, however, are practically potential independent. PACS numbers(s): 21.45.+v, 25.40.Lw, 27.10.+h The radiative capture of protons by deuterons and the inverse reaction, the photodisintegration of 3 He, have been investigated experimentally and theoretically over the last decades with quite some interest. Despite the various corresponding investigations, the theory is only in rough agreement with experiment, and there are inconsistencies between the data up to 30% in the magnitudes of the cross sections From the theoretical side several attempts have been made to describe the cross sections in this energy region. In the early calculations by Barbour et al. [6] phenomenological interactions were used. It was shown that the final state interaction is quite important, and that the E2 contributions in the electromagnetic interaction are needed in the differential cross section. In the calculations by Gibson and Lehman [7] a more realistic Yamaguchi interaction, but only the E1 components were employed. King et al. [2] performed an effective two-body, direct capture calculation with the initial state being treated as a plane wave, or as a scattering state generated from an optical potential. Fonseca and Lehman [8] calculated the polarization observables A yy and T 20 at the excitation energy E x = 14.75 MeV including only the E1 interaction. A calculation at E x = 15 MeV based on realistic interactions and both, the E1 and E2 contributions has been done by Ishikawa and Sasakawa [9]. Another calculation of A yy in this energy region is by Jourdan et al. [10]. It was found in all these investigations that T 20 is independent of the deuteron and the helium D-state probability, whereas A yy shows a weak dependence on these quantities.Very-low-energy radiative capture processes are of considerable astrophysical relevance. The p-d radiative capture, which at such energies is almost entirely a magnetic dipole (M1) transition, was studied in plane wave (Born) approximation by Friar et al. [11]. In these investigations the authors employed their configuration-space Faddeev calculations of the helium wave function, with inclusion of three-body forces and pion exchange currents. Various trends, e.g., the correlation between cross sections and helium binding energies, and their potential dependence were pointed out. More recently a rather detailed investigation of such processes has been performed by Viviani et al. [12]. Their calculations employed the quite accurate three-nucleon bound-and continuum states obtained in the ...

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supporting

confidence: 78%

mentioning

confidence: 90%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Radiative capture of protons by deuterons

Schadow

Sandhas

1999

Phys. Rev. C

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“…The pd experimental data are from Refs. [74][75][76][77][78][79][80][81], and the nd experimental data are from Refs. [73,82,84].…”

Section: Appendix Amentioning

confidence: 99%

Electromagnetic structure of A=2 and 3 nuclei and the nuclear current operator

et al. 2005

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Different models for conserved two-and three-body electromagnetic currents are constructed from two-and three-nucleon interactions, using either meson-exchange mechanisms or minimal substitution in the momentum dependence of these interactions. The connection between these two different schemes is elucidated. A number of low-energy electronuclear observables, including (i) np radiative capture at thermal neutron energies and deuteron photodisintegration at low energies, (ii) nd and pd radiative capture reactions, and (iii) isoscalar and isovector magnetic form factors of 3 H and 3 He, are calculated in order to make a comparative study of these models for the current operator. The realistic Argonne v18 two-nucleon and Urbana IX or Tucson-Melbourne three-nucleon interactions are taken as a case study. For A=3 processes, the bound and continuum wave functions, both below and above deuteron breakup threshold, are obtained with the correlated hyperspherical-harmonics method. Three-body currents give small but significant contributions to some of the polarization observables in the 2 H(p, γ) 3 He process and the 2 H(n, γ) 3 H cross section at thermal neutron energies. It is shown that the use of a current which did not exactly satisfy current conservation with the two-and three-nucleon interactions in the Hamiltonian was responsible for some of the discrepancies reported in previous studies between the experimental and theoretical polarization observables in pd radiative capture.

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NN P-Wave Effects in Polarized Deuteron Capture on Hydrogen: An Exact Faddeev Calculation

Fonseca¹,

Lehman

1992

Few-Body Problems in Physics

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Polarized and unpolarized proton capture on deuterium

Cited by 12 publications

References 10 publications

Radiative capture of protons by deuterons

Radiative capture of protons by deuterons

Electromagnetic structure of A=2 and 3 nuclei and the nuclear current operator

NN P-Wave Effects in Polarized Deuteron Capture on Hydrogen: An Exact Faddeev Calculation

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