Electroexcitation of negative-parity states in sup 18 O

• Published in: Physical review. C, Nuclear physics Nuclear physics, 1991-05, Vol.43:5
• Main Authors: Manley, D.M., Berman, B.L., Bertozzi, W., Buti, T.N., Finn, J.M., Hersman, F.W., Hyde-Wright, C.E., Hynes, M.V., Kelly, J.J., Kovash, M.A., Kowalski, S., Lourie, R.W., Murdock, B., Norum, B.E., Pugh, B., Sargent, C.P., Millener, D.J.
• Format: Article
• Language: English
• Subjects: 651320 - Nuclear Properties & Reactions, A=6-19, Experimental; CHARGED-PARTICLE REACTIONS; CROSS SECTIONS; DATA; DIFFERENTIAL CROSS SECTIONS; ELECTRON REACTIONS; ELECTRONIC EQUIPMENT; ENERGY RANGE; EXPERIMENTAL DATA; FORM FACTORS; FUNCTIONS; HARMONIC OSCILLATORS; INELASTIC SCATTERING; INFORMATION; LEPTON REACTIONS; MEV RANGE; MEV RANGE 01-10; NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEAR REACTIONS; NUMERICAL DATA; OSCILLATORS; OXYGEN 18 TARGET; PARTICLE PROPERTIES; SCATTERING; TARGETS; WAVE FUNCTIONS
• ISSN: 0556-2813; 1089-490X
• DOI: 10.1103/PhysRevC.43.2147

Form-factor measurements in the momentum-transfer range 0.6{le}{ital q}{le}2.7 fm{sup {minus}1} are presented for the 1{sup {minus}} levels in {sup 18}O at 4.46, 6.20, 7.62, and 8.04 MeV, the 3{sup {minus}} levels at 5.10, 6.40, and 8.29 MeV, and the 5{sup {minus}} levels at 7.86 and 8.13 MeV. These are the first measurements of the 5{sup {minus}} states by inelastic scattering and the first electron-scattering measurements of the higher 1{sup {minus}} and 3{sup {minus}} states. A Rosenbluth separation of the longitudinal and transverse form factors was performed by fitting the data with a phenomenological polynomial-times-Gaussian parametrization motivated by the form of theoretical form factors when harmonic-oscillator wave functions are used. Comparisons are made with structure models. The Coulomb form factors of several levels indicate the significance of small admixtures of 3{h bar}{omega} components in the negative-parity wave functions.