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

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

2009-03-30

arxiv.org/abs/0903.5130v1

Phys.Lett.B674:281-285,2009

Physics

Nuclear Physics

Nuclear Experiment

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

Scientific paper

10.1016/j.physletb.2009.03.047

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.

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