Search for isovector giant monopole resonances via the Pb(3He,tp) reaction
The (nat)Pb(3He,tp) reaction at E(3He) = 177 MeV was studied to identify 2Planck's over 2piomega isovector monopole strength in Bi isotopes. Monopole strength was found in the region -45<Q<-30 MeV in the coincidence data. The cross section is compared with distorted-wave Born approximation calculations for non-spin-flip and spin-flip isovector monopole resonances. The observed spin-flip and non-spin-flip monopole strengths in the proton-decay channel amount to 20% of the respective non-energy-weighted sum rule.
Zegers
RG
Kernfysisch Versneller Instituut, Zernikelaan 25, NL-9747 AA Groningen, The Netherlands.
van Den Berg AM
Brandenburg
S
Fleurot
FR
Fujiwara
M
Guillot
J
Hannen
VM
Harakeh
MN
Laurent
H
van Der Schaaf K
van Der Werf SY
Willis
A
Wilschut
HW