Author/Authors :
J.K. Jewell، نويسنده , , L.A. Riley، نويسنده , , P.D. Cottle، نويسنده , , K.W. Kemper، نويسنده , , T. Glasmacher، نويسنده , , R.W. Ibbotson، نويسنده , , H. Scheit، نويسنده , , M. Chromik، نويسنده , , Y. Blumenfeld، نويسنده , , S.E. Hirzebruch، نويسنده , , F. Marechal، نويسنده , , T. Suomijarvi، نويسنده ,
Abstract :
Elastic and inelastic proton scattering to the 21+ state of the single closed shell radioactive nucleus 20O have been measured in inverse kinematics with a beam energy of 30 MeV/u. The matrix element determined for the 0gs+→21+ transition in this work is compared with the corresponding electromagnetic matrix element to determine the ratio of the neutron and proton multipole matrix elements for this transition, Mn/Mp=2.9(4), which is quite different from the value Mn/Mp=N/Z=1.5 that would be expected for a purely isoscalar transition. A comparison of this result to a corresponding result for 18O suggests that the strength of the core polarizing interactions between the valence neutrons and the core protons and neutrons is changing significantly with mass.
