Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

$sup 90$ $sup 91$Zr photoproton spectra and the core-excitation model

Journal Article · · Nucl. Phys., A, v. A220, no. 2, pp. 241-258
OSTI ID:4334929
; ; ; ; ; ;

Photoproton energy spectra were measured for the /sup 90,91/Zr( gamma ,p) /sup 89,90/Y reactions at an E/sub gamma / endpoint energy of 30 MeV, and for the /sup 90,91/Zr(e,e'p)/sup 89,90/Y reactions at a number of different electron bea m energies around E e = 21 MeV. Isotopically enriched target foils of metallic /sup 90/Zr(97.65%) and /sup 91/Zr(89.2%) were used, and the proton spectra measured at 90". Prominent proton groups are observed in the /sup 91/Zr spectra, particularly around E/sub p/ approximately 11 MeV, which closel y resemble groups produced in the /sup 90/Zr photoreactions. Moreover, the correlating nonground state proton groups are produced in transitions leaving the corresponding /sup 89/Y, /sup 90/Y residual nuclei in excited levels which also correlate in energy. These photoproton groups from /sup 90/Zr have previously been identified as representing T> strength. A qualitative explanation is proposed in terms of the core-excitation model, in which the structure in the / sup 91/Zr proton spectrum is described as representing dipole T> (T = 13/2) strength formed by coupling the 2d/sub 5/2/ neutron to dipole T> (T = 6) excitations of a /sup 90/Zr core. (auth)

Research Organization:
Univ. of Melbourne
NSA Number:
NSA-29-025584
OSTI ID:
4334929
Journal Information:
Nucl. Phys., A, v. A220, no. 2, pp. 241-258, Journal Name: Nucl. Phys., A, v. A220, no. 2, pp. 241-258; ISSN NUPAB
Country of Publication:
Country unknown/Code not available
Language:
English

Similar Records

Isobaric analog resonances in (e,e'p) on $sup 90$Zr, $sup 89$Y, and $sup 88$Sr
Journal Article · Mon Dec 31 23:00:00 EST 1973 · Nucl. Phys., A, v. A221, no. 1, pp. 125-144 · OSTI ID:4340087
Photonuclear reactions in /sup 90/Zr
Journal Article · Sat May 01 00:00:00 EDT 1976 · Phys. Rev., C; (United States) · OSTI ID:7354491
PHOTOPROTONS FROM CARBON
Journal Article · Tue Oct 01 00:00:00 EDT 1963 · Nuclear Physics (Netherlands) Divided into Nucl. Phys. A and Nucl. Phys. B · OSTI ID:4131171

Related Subjects

*ELECTRON REACTIONS
*PHOTONUCLEAR REACTIONS
*ZIRCONIUM 90-- PHOTONUCLEAR REACTIONS
*ZIRCONIUM 91-- PHOTONUCLEAR REACTIONS
CORRELATIONS
COUPLING
DIPOLES
ENERGY
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
MEV RANGE 10-100
N68751* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
90 <= A <= 149--Nuclear Reactions & Scattering
NUCLEAR CORES
PROTONS
YTTRIUM 89
YTTRIUM 90