Giant dipole resonances built on isobaric analog states in pion double charge exchange

Mordechaǐ, S.; Auerbach, N.; Burleson, G. R.; Dhuga, K. S.; Dwyer, Michael P.; Faucett, J.A.; Fortune, H. T.; Gilman, R.; Greene, S.; Laymon, C. M.; Moore, C. Fred; Morris, C. L.; Oakley, D. S.; Ma, P.; Seestrom-Morris, S. J.; Seidl, P.A.; Smithson, M. J.; Wang, ZF; Zumbro, J.D.

doi:10.1103/physrevlett.60.408

Cited by 53 publications

(17 citation statements)

References 20 publications

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“…None of the higher double resonances have been observed. In a recent work 12 we reported the first observation of a GDR built on the isobaric analog state in pion DCX. In this Letter we report the first observation of nuclear double isovector dipole resonance.…”

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confidence: 97%

Pion Double Charge Exchange to the Double Dipole Resonance

et al. 1988

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We report the first observation of a double isovector giant dipole state in nuclei (i.e., an isovector giant dipole resonance built on another giant dipole). Two new resonances were observed in (/r + \K~) double charge exchange (at 7^-292 MeV) on nat S at excitation energies of 24.7 and 28.7 MeV. The energy centroid is very close to the energy at which the double dipole C/*= 5 0" , ",2 + ; T-2) state is expected to appear. The angular distributions for the resonances have a clear quadrupole shape. The measured cross sections and the angular distribution agree well with a simple sequential two-step calculation in which single charge exchange through the giant dipole resonance to the double dipole is evaluated.

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confidence: 97%

Pion Double Charge Exchange to the Double Dipole Resonance

et al. 1988

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“…The DIAS peaks were apparent in these spectra, and they were Gtted with peak shapes taken &om elastic scattering. Following standard practice in analyzing pion DCX data, the background was assumed to be described by a thirdorder polynomial in Q [21,22]. There were a few events at the locations corresponding to the Kr ground states, and they were analyzed by summing the normalized yields in the regions of interest.…”

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confidence: 99%

Pion double charge exchange on the even selenium isotopes

et al. 1995

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Pion-induced double charge exchange (m+, v ) on " ' ' ' Se, leading to the double isobaric analog states (DIAS) and the ground states of ' ' ' Kr, has been studied at a laboratory angle of 5' and incident pion kinetic energy of 2S3.2 MeV. Cross sections for these transitions have been extracted, and those for the DIAS are compared to two simple models of pion double charge exchange. PACS number(s): 25.80.Gn, 27.50.+e

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“…More recently the triple giant quadrupole resonance has been observed at GANIL by using, for the first time, the SPEG spectrometer in conjunction with the INDRA 4π detector [4,5]. Multiphonon excitations were clearly observed in double charge-exchange reactions using (π + , π − ) and (π − , π + ) reactions [6]. The study of the excitation of the double giant dipole resonances (DGDR) of very heavy nuclei by means of relativistic Coulomb excitation have been investigated in experiments performed at GSI within the LAND Collaboration [7].…”

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Microscopic calculations of double and triple giant resonance excitations in heavy ion collisions

et al. 2006

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We perform microscopic calculations of the inelastic cross sections for the double and triple excitation of giant resonances induced by heavy-ion probes within a semiclassical coupled-channels formalism. The channels are defined as eigenstates of a bosonic quartic Hamiltonian constructed in terms of collective random-phase approximation phonons. Therefore, they are superpositions of several multiphonon states, also with different numbers of phonons, and the spectrum is anharmonic. The inclusion of (n+1) phonon configurations affects the states whose main component is a n-phonon one and leads to an appreacible lowering of their energies. We check the effects of such further anharmonicities on the previously published results for the cross section for the double excitation of giant resonances (GR). We find that the only effect is a shift of the peaks toward lower energies, the double GR cross section being unmodified by the explicity inclusion of the three-phonon channels in the dynamical calculations. The latter provide an important contribution to the cross section in the triple GR energy region, which, however, is still smaller than the experimental available data. The inclusion of four-phonon configurations in the structure calculations does not modify the results.

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Giant dipole resonances built on isobaric analog states in pion double charge exchange

Cited by 53 publications

References 20 publications

Pion Double Charge Exchange to the Double Dipole Resonance

Pion Double Charge Exchange to the Double Dipole Resonance

Pion double charge exchange on the even selenium isotopes

Microscopic calculations of double and triple giant resonance excitations in heavy ion collisions

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