Electroexcitation of rotational bands in sup 18 O

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.41.448· OSTI ID:7165517

Manley, D M ^[1]; Millener, D J ^[2]; Berman, B L ^[3]; 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 ^[4]

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1. Department of Physics and Center for Nuclear Research, Kent State University, Kent, Ohio 44242 (USA)
2. Brookhaven National Laboratory, Upton, New York 11973 (USA)
3. Department of Physics, The George Washington University, Washington, D.C. 20052 (USA)
4. Department of Physics and Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (USA)

The fourth 2{sup +} state in {sup 18}O at an excitation energy of 8.21 MeV has been studied by high-resolution electron scattering. The Coulomb form factor for this state was measured in the momentum-transfer range 0.9{le}{ital q}{le}2.1 fm{sup {minus}1} and the extracted {ital B}({ital C}2){up arrow} value was determined to be 7.3{plus minus}4.2 {ital e}{sup 2}fm{sup 4}. The level at 8.21 MeV is identified as a four-particle, two-hole (4p2h) state of the type {ital p}{sup {minus}2}(sd){sup 4}. Form-factor measurements in the range 1.0{le}{ital q}{le}1.9 fm{sup {minus}1} are also presented for a strongly excited normal-parity state at 9.36 MeV. Preliminary measurements of the differential cross section for exciting this state by 135-MeV protons suggest a 2{sup +} assignment; the measured Coulomb form factor of this state allows it to be identified as the best experimental candidate for a predicted {ital K}=2 4p2h state with the four {ital sd}-shell nucleons coupled to {ital T}=0. The excitation of these states and other members of rotational bands in {sup 18}O are discussed within the framework of structure models. Shell-model calculations for the {ital C}4 form factors of the first three 4{sup +} states in {sup 18}O are compared to existing data.

• DOE Contract Number: AC02-76ER03069
• OSTI ID: 7165517
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 41:2; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651320* -- Nuclear Properties & Reactions
A=6-19
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
CHARGED-PARTICLE REACTIONS
ELECTRON REACTIONS
ENERGY LEVELS
EVEN-EVEN NUCLEI
EXCITED STATES
FORM FACTORS
INELASTIC SCATTERING
ISOTOPES
LEPTON REACTIONS
LIGHT NUCLEI
LINEAR ACCELERATORS
MATHEMATICAL MODELS
MIT BATES LINAC
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
OXYGEN 18
OXYGEN 18 TARGET
OXYGEN ISOTOPES
PARTICLE PROPERTIES
PARTICLE-HOLE MODEL
ROTATIONAL STATES
SCATTERING
SHELL MODELS
STABLE ISOTOPES
TARGETS