Photon-induced multiple particle emissions of {sup 90}Zr and {sup nat}Zr from 10 to 140 MeV

Journal Article · Mon Jan 15 04:00:00 EST 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.014605· OSTI ID:20990961

Rodrigues, T E; Martins, M N; Garcia, C; Arruda-Neto, J D. T. ^[1]; Mesa, J ^[2]; Shtejer, K ^[1]; Garcia, F ^[3]

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1. Instituto de Fisica da Universidade de Sao Paulo, P. O. Box 66318, CEP 05315-970, Sao Paulo (Brazil)
2. Instituto de Biociencias, Universidade Estadual de Sao Paulo, Botucatu (Brazil)
3. Universidade Estadual de Santa Cruz, Ilheus (Brazil)

A comprehensive analysis of electrodisintegration yields of protons on {sup 90}Zr is proposed taking into account the giant dipole resonance, isovector giant quadrupole resonance (IVGQR), and quasideuteron contributions to the total photoabsorption cross section from 10 to 140 MeV. The calculation applies the MCMC intranuclear cascade to address the direct and pre-equilibrium emissions and another Monte Carlo-based algorithm to describe the evaporation step. The final results of the total photoabsorption cross section for {sup 90}Zr and relevant decay channels are obtained by fitting the (e,p) measurements from the National Bureau of Standards and show that multiple proton emissions dominate the photonuclear reactions at higher energies. These results provide a consistent explanation for the exotic and steady increase of the (e,p) yield and also a strong evidence of a IVGQR with a strength parameter compatible with the E2 energy-weighted sum rule. The inclusive photoneutron cross sections for {sup 90}Zr and {sup nat}Zr, derived from these results and normalized with the (e,p) data, are in agreement within 10% with both Livermore and Saclay data up to 140 MeV.

• OSTI ID: 20990961
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALGORITHMS
CROSS SECTIONS
EMISSION
ISOVECTORS
MEV RANGE
MONTE CARLO METHOD
NUCLEAR CASCADES
PHOTONS
PHOTONUCLEAR REACTIONS
PROTONS
SUM RULES
US NBS
ZIRCONIUM 90