0000000000653400

AUTHOR

J.a. Niskanen

showing 3 related works from this author

Pion vs. photon absorption on the deuteron

1995

Abstract Using an NN → ΔN transition potential fixed by the reaction pp ↔ dπ+ a good agreement can be obtained also for the reaction γd → pn in the Δ region. Further it is seen that the πNΔ and ϱNΔ parameters of the widely used Bonn potential, fitting the NN sector, yield a transition potential too weak to reproduce the pion production or absorption cross section.

PhysicsNuclear and High Energy PhysicsPhoton010308 nuclear & particles physicsAbsorption cross section01 natural sciences7. Clean energyNuclear physicsPionDeuteriumYield (chemistry)0103 physical sciencesAtomic physics010306 general physicsAbsorption (electromagnetic radiation)Physics Letters B
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Comment on "Total Cross Section for Photon Absorption by Two Protons inHe3"

1995

PhysicsCross section (physics)Photon010308 nuclear & particles physics0103 physical sciencesGeneral Physics and AstronomyNuclear cross sectionAtomic physics010306 general physicsAbsorption (electromagnetic radiation)01 natural sciencesPhysical Review Letters
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Photon absorption on a proton-proton pair inHe3

1995

We calculate the total cross sections for different multiple transitions in photon absorption in a {sup 1}{ital S}{sub 0} {ital pp} pair embedded in a {sup 3}He nucleus. Employing two models, one involving only nucleon degrees of freedom, the other in addition the {Delta}(1232) isobar, we show that the {Delta} gives important effects even in transitions where the photon cannot couple directly to the isobar.

PhysicsNuclear and High Energy PhysicsPhotonProton010308 nuclear & particles physicsNuclear TheoryDegrees of freedom (physics and chemistry)Few-body systems01 natural sciencesHelium-30103 physical sciencesIsobarAbsorption (logic)Atomic physicsNuclear Experiment010306 general physicsNucleonPhysical Review C
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