Isomeric ratios in photon-induced spallation reactions at intermediate energies

Abstract

Available experimental isomeric cross-section ratios in photon-induced spallation reactions at intermediate energies are compiled. The experimental data are compared to calculations based on {he statistical model formalism.

Some (?, ?? xn) reactions on197Au at intermediate energies

“…The cross sections at this energy are known to give a good estimate of measured mean cross sections in the energy region studied [9]. To determine in what proportion the isomeric and ground states are populated the Huizenga-Vandenbosch formalism was put into the calculations as described in Ref.…”

“…To determine in what proportion the isomeric and ground states are populated the Huizenga-Vandenbosch formalism was put into the calculations as described in Ref. 9 and with the same choice of parameters. The calculations on the 197Au()',Tr-xn)-reactions indicate a broad maximum in the cross sections around x=5, the maximum being about 200 jab.…”

Study of the isomeric yield ratio in the photoneutron reaction of natural holmium induced by laser-accelerated electron beams

“…In the case of the bremsstrahlung photon, the expression of the IR reads (Jonsson et al, 1977) as follows:…”

Measurement of isomeric yield ratios of 86m,g Y, 87m,g Y, and 89m,g Zr in the photonuclear reactions of 89 Y and nat Zr at the end-point bremsstrahlung energies of 45 and 55 MeV

“…These parameters give the information about the angular momentum dependence of nuclear level density, which is necessary to understand the nuclear reaction mechanisms [7][8][9][10][11][12]. At energies below 30 MeV, the giant dipole resonance (GDR) is the dominant mechanism in photo-absorption reactions.…”