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Electroexcitation of rotational bands inO18
- Source :
- Physical Review C. 41:448-457
- Publication Year :
- 1990
- Publisher :
- American Physical Society (APS), 1990.
-
Abstract
- 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.
Details
- ISSN :
- 1089490X and 05562813
- Volume :
- 41
- Database :
- OpenAIRE
- Journal :
- Physical Review C
- Accession number :
- edsair.doi...........3094875b2fe543d3221302b1d57c9182
- Full Text :
- https://doi.org/10.1103/physrevc.41.448