Isoscalar giant dipole resonance and nuclear matter incompressibility coefficient

Abstract

We present results of microscopic calculations of the strength function $S(E)$ and $\ensuremath{\alpha}$-particle excitation cross sections $\ensuremath{\sigma}(E)$ for the isoscalar giant dipole resonance (ISGDR). An accurate and general method to eliminate the contributions of spurious state mixing is presented and used in the calculations. Our results provide a resolution to the long standing problem that the nuclear matter incompressibility coefficient K deduced from $\ensuremath{\sigma}(E)$ data for the ISGDR is significantly smaller than that deduced from data for the isoscalar giant monopole resonance.