Systematic Investigation of the Giant Monopole Resonance with 108.5 MeV exp 3 He Through the Periodic Table

摘要

Inelastic spectra of 108.5 MeV exp 3 He projectiles have been measured at very forward angles including zero degrees, by using an improved experimental set up to remove slit scattering. Targets were exp 12 C, exp 27 Al, exp 40 Ca, exp 56 Fe, exp 58 Ni, exp 60 Ni, exp 66 Zn, exp 68 Zn, exp 89 Y, exp 90 Zr, exp 92 Mo, exp 96 Mo, exp 100 Mo, exp 108 Pd, exp 107 Ag, exp 110 Cd, exp 116 Cd, exp 115 In, exp 116 Sn, exp 120 Sn, exp 124 Sn, exp 140 Ce, exp 144 Sm, exp 150 Sm, exp 152 Sm, exp 169 Tm, exp 175 Lu, exp 181 Ta, exp 197 Au and exp 208 Pb. A giant monopole resonance is observed above the giant quadrupole resonance in nuclei of mass A>60. The excitation energy deviates from the 80A/sup -1/3/ law with decreasing A. For smaller masses, no monopole strength is found separated from the quadrupole strength, unless largely fractionnated and at a lower excitation energy. Preliminary DWBA analysis and percentages of the energy weighted sum rule are presented. Compression moduli are derived. (Atomindex citation 11:561492)