Isospin splitting of the giant dipole resonance in the {sup 63}Cu nucleus

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Physics of Atomic Nuclei

OSTI ID:146028

Varlamov, V V; Efimkin, N G; Ishkhanov, B S ^[1]

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1. Moscow State Univ. (Russian Federation); and others

The cross sections for the reactions {sup 63}Cu({gamma},n){sup 62}Cu, {sup 63}Cu({gamma},np){sup 61}Ni, and {sup 63}Cu({gamma},p) {sup 62}Ni are evaluated using the method of global analysis and results of photonuclear experiments that involve significant systematic errors associated with differences in the effective photon spectra and the absolute normalization and energy calibration in individual experiments. The positions of the components with isospins T{sub <}=T{sub o}=5/2 and T{sub >}=T{sub o}+1=7/2 on the energy scale are determined from a comparative analysis of the energy dependences of the cross sections for the reactions {sup 63}Cu({gamma},p){sup 62}Ni and {sup 63}Cu({gamma},n){sup 62}Cu. The parameters of the isospin splitting are determined by fitting the cross sections of the two reactions with the help of appropriate Gaussians. The isospin splitting amounts to {delta}E=E(T{sub >})-E(T{sub <})=U(T{sub o} + 1)/T{sub o}=U{sub o}(T{sub o} + 1)/A=4.8{plus_minus}0.4MeV. The energy of nuclear symmetry is found to be U{sub o}=86.4{plus_minus}7.2MeV. The intensity ratio for isospin components is estimated at R=({sigma}{sup >}{sub {minus}1})/({sigma}{sup >}{sub {minus}1}+{sigma}{sup <}{sub {minus}1})=0.37{plus_minus}0.02. 25 refs., 5 figs., 5 tabs.

• OSTI ID: 146028
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 3 Vol. 58; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COPPER 63 TARGET
CROSS SECTIONS
GIANT RESONANCE
ISOSPIN
NUCLEAR STRUCTURE
PHOTONUCLEAR REACTIONS