Effects of isoscalar admixtures on the combined analysis of electron-nucleus and proton-nucleus scissors mode'' excitations in the f - p shell

Journal Article · Mon Oct 01 00:00:00 EDT 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.42.1408· OSTI ID:6028173

Zheng, D C; Zamick, L ^[1]; Moya de Guerra, E ^[2]; Richter, A ^[3]

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1. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855-0849 (USA)
2. Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Cientificas, 28006, Madrid (Spain)
3. Institut fuer Kernphysik der Technischen Hochschule Darmstadt, 6100 Darmstadt (Federal Republic of Germany)

In the single {ital j} shell approximation, only the isovector amplitudes of electron-nucleus or proton-nucleus scattering contribute to the excitation of 1{sup +} states from the {ital J}=0{sup +} targets of even-even nuclei, provided the excitation is a one-step process. However, when configuration mixing is put in, one also obtains contributions from isoscalar amplitudes, which are here studied for various nuclei in the {ital f}-{ital p} shell{endash}{sup 44}Ti, {sup 46}Ti, {sup 48}Ti and {sup 50}Cr. A comparison of the {ital cross}-{ital conjugate} pairs {sup 46}Ti and {sup 50}Cr is made. The decomposition of the electron-nucleus scattering into an orbital and spin part is made. The isoscalar effects are small and are unable to explain the discrepancies between the experimental analysis and the shell model calculations with regards to the variation of the orbit to spin ratio for various nuclei. However, there is probably hidden orbital strength in a state in {sup 50}Cr for which the spin and orbit excitation amplitudes interfere destructively.

• DOE Contract Number: FG05-86ER40299
• OSTI ID: 6028173
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Vol. 42:4; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHROMIUM 50
ENERGY LEVELS
CHROMIUM 50 TARGET
ELECTRON REACTIONS
PROTON REACTIONS
INELASTIC SCATTERING
TITANIUM 44
TITANIUM 44 TARGET
TITANIUM 46
TITANIUM 46 TARGET
TITANIUM 48
TITANIUM 48 TARGET
CONFIGURATION MIXING
EVEN-EVEN NUCLEI
NUCLEAR DEFORMATION
PARITY
SHELL MODELS
SPIN
ANGULAR MOMENTUM
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
CHROMIUM ISOTOPES
DEFORMATION
ELECTRON CAPTURE RADIOISOTOPES
HADRON REACTIONS
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
LEPTON REACTIONS
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
PARTICLE PROPERTIES
RADIOISOTOPES
SCATTERING
STABLE ISOTOPES
TARGETS
TITANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES
653001* - Nuclear Theory- Nuclear Structure
Moments
Spin
& Models
653003 - Nuclear Theory- Nuclear Reactions & Scattering