Double giant resonances in pion double charge exchange on^{51} V,^{115} In, and^{197} Au Academic Article uri icon

abstract

  • Resonances were observed in the continuum in pion-induced double charge exchange (at Tπ=295 MeV) on 51V at Q=-14.0, -32.4, and -48.0 MeV, on 115In at Q=-25.0, -37.3, and -49.6 MeV, and on 197Au at Q=-35.0, -44.3, and -54.9 MeV. The three resonances have different characteristic angular distributions. Partial angular distributions were measured on 51V and 115In and observed to have Jπ=0+, 1-, and 2+ shapes, respectively. Based on their centroid energies, angular distributions, and observed cross sections, we identify the resonances as the double isobaric analog state, the giant dipole built on the isobaric analog, and the double giant dipole resonance. The new observations are in close agreement with the gross features reported recently for the double giant resonances, and provide some of the best signals obtained to date for the double resonance states in nuclei.

publication date

  • April 1, 1993