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Title: Statistical and pre-equilibrium (. gamma. ,. cap alpha. ) cross sections of /sup 90/Zr and their multipolarities via the /sup 90/Zr(e,. cap alpha. ) reaction

Abstract

The (e,..cap alpha..) cross section in /sup 90/Zr has been measured at incident electron energies from 13.5 MeV to 66.5 MeV for ..cap alpha.. particles between 6.9 and 16.8 MeV. The (..gamma..,..cap alpha..) cross section was deduced from it assuming both E1 interaction and E2 interaction. The angular distribution of the (..gamma..,..cap alpha../sub 0/) cross section and an experiment using the bremsstrahlung plus electron beam make it clear that the E1 interaction is dominant over all the present energy range. The (..gamma..,..cap alpha..) cross section extracted by using E1 virtual photon spectra has a large bump above the excitation energy of 30 MeV in addition to a bump in the giant dipole resonance region. The (..gamma..,..cap alpha../sub 0/) cross section also has a bump at the giant dipole resonance which exhausts most of the (..gamma..,..cap alpha..) cross section in that region. The compound nucleus model was used successfully to explain the bump at the giant dipole resonance. The cross section above 30 MeV is discussed in terms of the pre-equilibrium ..cap alpha.. emission process combined with the quasi-deuteron model.

Authors:
; ; ;
Publication Date:
Research Org.:
Laboratory of Nuclear Science, Tohoku University, Mikamine, Sendai, Japan
OSTI Identifier:
5456755
Resource Type:
Journal Article
Journal Name:
Phys. Rev., C; (United States)
Additional Journal Information:
Journal Volume: 21:5
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ELECTRON REACTIONS; PHOTONUCLEAR REACTIONS; ZIRCONIUM 90 TARGET; ALPHA SPECTRA; ANGULAR DISTRIBUTION; BREMSSTRAHLUNG; COMPOUND-NUCLEUS REACTIONS; CROSS SECTIONS; DEUTERONS; DIPOLE MOMENTS; E1-TRANSITIONS; E2-TRANSITIONS; GIANT RESONANCE; MEV RANGE 10-100; PRECOMPOUND-NUCLEUS EMISSION; STATISTICAL MODELS; CHARGED PARTICLES; CHARGED-PARTICLE REACTIONS; DISTRIBUTION; ELECTROMAGNETIC RADIATION; ENERGY RANGE; ENERGY-LEVEL TRANSITIONS; LEPTON REACTIONS; MATHEMATICAL MODELS; MEV RANGE; MULTIPOLE TRANSITIONS; NUCLEAR REACTIONS; RADIATIONS; RESONANCE; SPECTRA; TARGETS; 651725* - Nuclear Properties & Reactions, A=90-149, Experimental- Nuclear Reactions & Scattering- (-1987); 651723 - Nuclear Properties & Reactions, A=90-149, Experimental- Energy Levels & Transitions- (-1987)

Citation Formats

Tamae, T, Urano, T, Hirooka, M, and Sugawara, M. Statistical and pre-equilibrium (. gamma. ,. cap alpha. ) cross sections of /sup 90/Zr and their multipolarities via the /sup 90/Zr(e,. cap alpha. ) reaction. United States: N. p., 1980. Web. doi:10.1103/PhysRevC.21.1758.
Tamae, T, Urano, T, Hirooka, M, & Sugawara, M. Statistical and pre-equilibrium (. gamma. ,. cap alpha. ) cross sections of /sup 90/Zr and their multipolarities via the /sup 90/Zr(e,. cap alpha. ) reaction. United States. https://doi.org/10.1103/PhysRevC.21.1758
Tamae, T, Urano, T, Hirooka, M, and Sugawara, M. 1980. "Statistical and pre-equilibrium (. gamma. ,. cap alpha. ) cross sections of /sup 90/Zr and their multipolarities via the /sup 90/Zr(e,. cap alpha. ) reaction". United States. https://doi.org/10.1103/PhysRevC.21.1758.
@article{osti_5456755,
title = {Statistical and pre-equilibrium (. gamma. ,. cap alpha. ) cross sections of /sup 90/Zr and their multipolarities via the /sup 90/Zr(e,. cap alpha. ) reaction},
author = {Tamae, T and Urano, T and Hirooka, M and Sugawara, M},
abstractNote = {The (e,..cap alpha..) cross section in /sup 90/Zr has been measured at incident electron energies from 13.5 MeV to 66.5 MeV for ..cap alpha.. particles between 6.9 and 16.8 MeV. The (..gamma..,..cap alpha..) cross section was deduced from it assuming both E1 interaction and E2 interaction. The angular distribution of the (..gamma..,..cap alpha../sub 0/) cross section and an experiment using the bremsstrahlung plus electron beam make it clear that the E1 interaction is dominant over all the present energy range. The (..gamma..,..cap alpha..) cross section extracted by using E1 virtual photon spectra has a large bump above the excitation energy of 30 MeV in addition to a bump in the giant dipole resonance region. The (..gamma..,..cap alpha../sub 0/) cross section also has a bump at the giant dipole resonance which exhausts most of the (..gamma..,..cap alpha..) cross section in that region. The compound nucleus model was used successfully to explain the bump at the giant dipole resonance. The cross section above 30 MeV is discussed in terms of the pre-equilibrium ..cap alpha.. emission process combined with the quasi-deuteron model.},
doi = {10.1103/PhysRevC.21.1758},
url = {https://www.osti.gov/biblio/5456755}, journal = {Phys. Rev., C; (United States)},
number = ,
volume = 21:5,
place = {United States},
year = {Thu May 01 00:00:00 EDT 1980},
month = {Thu May 01 00:00:00 EDT 1980}
}