Direct proton decay of the isoscalar giant dipole resonance in Pb-208
- Nayak, B. K.
- Garg, U.
- Koss, M.
- Li, T.
- Martis, E.
- Fujimura, H.
- Fujiwara, M.
- Hara, K.
- Kawase, K.
- Nakanishi, K.
- Obayashi, E.
- Yoshida, H. P.
- Itoh, M.
- Kishi, S.
- Sakaguchi, H.
- Takeda, H.
- Uchida, M.
- Yasuda, Y.
- Yosoi, M.
- Zegers, R. G. T.
- Akimune, H.
- Harakeh, M. N.
- Hunyadi, M.
DOIAbstract
The excitation and subsequent proton decay of the isoscalar giant dipole resonance (ISGDR) in Pb-208 have been investigated via the Pb-208(alpha,alpha'p)(TI)-T-207 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 Pb-208(alpha,alpha') 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 (TI)-T-207 have been determined and the results are compared with predictions of continuum random-phase-approximation (CRPA) calculations. (C) 2009 Elsevi...
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