Isoscalar Giant Resonances in Molybdenum Isotopes

It is a well-established question in nuclear structure as to why the incompressibility of nuclear matter calculated from the $E0$ giant resonance strength distributions of open-shell nuclei, such as tin and cadmium isotopes, is lower than that determined using data on closed-shell nuclei such as $^{208}$Pb. To investigate this, giant resonance strength distributions have been extracted for the isotopic chain $^{94,96,97,98,100}$Mo. Angular distributions for 100 MeV/u $\alpha$ particles were obtained using the spectrometer Grand Raiden. Multipole decompositions were carried out on the distributions to isolate the monopole, dipole, and quadrupole strength over the excitation energy range of the spectra. Results of the analysis and implications for the nuclear incompressibility will be discussed.