Back to Search Start Over

Electroexcitation of rotational bands inO18

Authors :
D. J. Millener
B. L. Berman
J. M. Finn
C. P. Sargent
D. M. Manley
B. Murdock
S. Kowalski
James J. Kelly
T. N. Buti
M.V. Hynes
M. A. Kovash
B. E. Norum
C. E. Hyde-Wright
B. Pugh
R. W. Lourie
F. W. Hersman
William Bertozzi
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