Photodisintegration of the Deuteron at High Energies

Hsieh, S. H.

doi:10.1143/ptp.21.585

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…The contributions in the region x<\ to the radial integrals (12) are, as can easily be seen, smaller than for the magnetic transitions (19). For the radial integrals of the spin magnetic transition (19) especially, the transition amplitude from the deuteron s state to the final s state results in a very big contribution in the region x<l, because a major part of the final s-state wave function jo(kx) is concentrated within this region and the estimated error already amounts to 38% at 162 MeV.…”

Section: Discussion Of the Resultsmentioning

confidence: 77%

“…It might be noted that even for electric dipole transitions only, the retardation effect has been reported to be large. 12 These conclusions, however, differ from those of Nicholson and Brown, and of Kramer and Werntz. The interference of the magnetic triplet transition with the electric transitions makes a particularly large asymmetry in the angular distributions, as has been pointed out by Breit et al 4 The purpose of the present paper is to complete the calculations of the electric, magnetic triplet, and magnetic spin-flip transitions, including all multipole transitions and their retardations, and then to clarify their relative effects in the energy region 162-to 800-MeV incident photon energy.…”

Section: Introductionmentioning

confidence: 82%

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Electromagnetic Transitions for the Photodisintegration of the Deuteron

Matsumoto

1963

Phys. Rev.

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Over-all electromagnetic transitions for the photodisintegration of the deuteron are examined in the energy range 162 to 833 MeV. The virtual meson exchange interaction is not considered. The electromagnetic interactions are treated without any series expansion. Therefore, all multipole transitions and their retardations are completely taken into account in the calculations.The pion-theoretical deuteron wave function and plane waves are used for the initial and final states, neglecting the effects of the hard core in the nucleon-nucleon potential. It is then shown that the angular dependence of those terms which are simply isotropic in the electric dipole approximation is given approximately by the isotropic part in the electric dipole transition, plus a cosine curve due to the overlap effects of the higher multipole transitions, as well as overlap effects due to all retardations. The terms which reduce to the anisotropic terms in the electric dipole approximation give angular distributions which are shifted forward from sin% but which tend to flatten out with increasing energy. The separate retardation effects due to the dipole and other multipole terms cannot be distinguished in the present calculation.For some reason the total cross sections seem to fit the experimental data fairly well at energies higher than 400 MeV when only the electric transitions are taken into account. However, the total cross sections including magnetic transitions are about four times the experimental data at 800 MeV. The contribution of the magnetic transitions to the cross sections does not decrease as much with energy as does the contribution due to the electric transitions and remains relatively large at high energy. The effect of disregarding the hard core is large for the spin magnetic transitions.

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Section: Discussion Of the Resultsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 82%

Electromagnetic Transitions for the Photodisintegration of the Deuteron

Matsumoto

1963

Phys. Rev.

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“…6 ), 7) This shows that the transitions from the deuteron D-state make the actual E1 cross section considerably larger than the Schiff and Marshall-Guth estimation. S ) Since the contribution of the direct (i.e.…”

Section: § 1 Introductionmentioning

confidence: 85%

Photodisintegration of the Deuteron at High Energies

Akiba

1960

Prog. Theor. Phys.

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The exchange current effects in the photodisintegration of the deuteron at high energies are discussed. Special consideration is given to (i) correlation of the exchange effects with the large direct E1 transition, whose behavior has been the object of the recent several investigations, (ii) consequences of gauge invariance for the electric transitions due to exchange effects, (iii) evaluation of the magnetic transition caused by the (33)-resonance in terms of the results of the Chew-Low theory. It is shown that exchange effects affect the electric dipole transition operator in a way consistent with the Siegert theorem. The resulting change in the electric dipole cross section is evaluated in the adiabatic approximation as well as in neglect of higher order retardation effect. It is appreciable only at photon energies above the pion threshold. Some characteristics of the (33) -resonance effect are revealed, although nucleonrecoil effects and uncertainty of nuclear force make it difficult to give any quantitative estimation. Finally the results obtained here are compared with experiment. § 1. IntroductionRecently the progress of knowledge about nuclear force has motivated several detailed reviews 1 )-5) on the photodisintegration of the deuteron at about 80 Mev photon energy. As the result it has become clear that the experimental data can be well explained in terms of E1 and E2 transitions alone, provided that we use a somewhat large value to the D-state probability of the deuteron as well as the phase shifts fit for the p-p scattering data to the final continuum states. It should be noted that any necessity to invoke specific exchange current effects is not felt.Subsequently, the analysis is extended on the same line to the higher energy region. 6 ),7)This shows that the transitions from the deuteron D-state make the actual E1 cross section considerably larger than the Schiff and Marshall-Guth estimation. S ) Since the contribution of the direct (i.e. not involving exchange current interaction) E1 transition is recognized to be remarkable even in the high energy region, it is desirable to investigate the effects of pion-exchange-current, taking into account their correlation with the direct transition.In this paper we shall discuss the exchange c:urrent effects in the region of photon energy 100 Mev to 350 Mev, and see where theprevious discussions on the exchange current interaction must be supplemented or amended by the existence of the large direct E1 transition. For simplicity our discussion is confined to the contribution of one-pion-exchange processes.

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Effects of electromagnetic retardation in the photodisintegration of the deuteron

Nunemaker

Sharma

1983

Nuov Cim A

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Photodisintegration of the Deuteron at High Energies

Cited by 9 publications

References 6 publications

Electromagnetic Transitions for the Photodisintegration of the Deuteron

Electromagnetic Transitions for the Photodisintegration of the Deuteron

Photodisintegration of the Deuteron at High Energies

Effects of electromagnetic retardation in the photodisintegration of the deuteron

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