The direct proton decay of the isoscalar giant dipole resonance (ISGDR) has been studied in 208Pb using the (α, α′ p) reaction at a bombarding energy of 200 MeV. Through observation of direct-decay protons from the ISGDR in coincidence with scattered α-particles, the population of proton-hole states in 207T1 was studied, allowing us to test recently performed continuum-RPA (CRPA) calculations for the ISGDR and thereby to learn about its microscopic structure. The energy and width of the ISGDR were also determined to be 22.1 ± 0.3 MeV and 3.8 ± 0.8 MeV, respectively. A new resonance of quadrupole character was observed at E x = 26.9 ± 0.7 MeV with a width of 6.0 ± 1.3 MeV.
|Number of pages||7|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - Dec 11 2003|
ASJC Scopus subject areas
- Nuclear and High Energy Physics