Direct proton decay of the isoscalar giant dipole resonance in 208Pb

Abstract

The excitation and subsequent proton decay of the isoscalar giant dipole resonance (ISGDR) in ${}^{208}$Pb have been investigated via the ${}^{208}$Pb($\alpha ,{\alpha }^{\prime }p{)}^{207}$Tl reaction at 400 MeV. Excitation of the ISGDR has been identified by the difference-of-spectra method. The enhancement of the ISGDR strength at high excitation energies observed in the multipole-decomposition-analysis of the singles ${}^{208}$Pb($\alpha ,{\alpha }^{\prime }$) spectra is not present in the excitation energy spectrum obtained in coincidence measurement. The partial branching ratios for direct proton decay of ISGDR to low-lying states of ${}^{207}$Tl have been determined and the results are compared with predictions of continuum random-phase-approximation (CRPA) calculations.

arXiv comment12 pages, 4 figures; accepted for publication in Physics Letters B

References in corpus (2)

• "Bi-modal'' Isoscalar Giant Dipole Strength in ${}^{58}$Ni
• Overtones of Isoscalar Giant Resonances in medium-heavy and heavy nuclei

Cited by in corpus (5)

• The Compression-Mode Giant Resonances and Nuclear Incompressibility
• Nuclear Equation of State from ground and collective excited state properties of nuclei
• Isoscalar giant resonances in the Sn nuclei and implications for the asymmetry term in the nuclear-matter incompressibility
• Giant Monopole Resonance in even-A Cd isotopes, the asymmetry term in nuclear incompressibility, and the "softness" of Sn and Cd nuclei
• Proton decay from the isoscalar giant dipole resonance in ${}^{58}$Ni