Gerald A. Fisher

GiantE1 resonances inNe20observed with theF19(p→γ0γ1)20Ne reactions

The giant electric dipole resonance built upon the 0/sup +/ ground state of /sup 20/Ne was studied via the /sup 19/F(p-arrow-right,..gamma../sub 0/)/sup 20/Ne reaction. Polarized and unpolarized angular distributions were measured between E/sub x/ = 16.1 and 23.0 MeV (E/sub p/ = 3--10 MeV) and the E1 T-matrix elements extracted. The /sup 1/P, E1 partial wave dominates, but the weaker /sup 3/P (spin flip) term is also resonant. A heuristic doorway state model has been used to fit the pronounced structure in the giant E1 resonance. Data for the giant resonance built on the first excited state as seen in the /sup 19/F(p-arrow-right,..gamma../sub 1/)/sup 20/Ne reaction are presented and discussed. The microscopic, doorway state calculation in a deformed potential of Schmid and Do Dang is in very good agreement with the main features of the results.

Giant E1 resonances in /sup 20/Ne observed with the /sup 19/F(p-arrow-right. gamma. /sub 0/. gamma. /sub 1/) /sup 20/Ne reactions

The giant electric dipole resonance built upon the 0/sup +/ ground state of /sup 20/Ne was studied via the /sup 19/F(p-arrow-right,..gamma../sub 0/)/sup 20/Ne reaction. Polarized and unpolarized angular distributions were measured between E/sub x/ = 16.1 and 23.0 MeV (E/sub p/ = 3--10 MeV) and the E1 T-matrix elements extracted. The /sup 1/P, E1 partial wave dominates, but the weaker /sup 3/P (spin flip) term is also resonant. A heuristic doorway state model has been used to fit the pronounced structure in the giant E1 resonance. Data for the giant resonance built on the first excited state as seen in the /sup 19/F(p-arrow-right,..gamma../sub 1/)/sup 20/Ne reaction are presented and discussed. The microscopic, doorway state calculation in a deformed potential of Schmid and Do Dang is in very good agreement with the main features of the results.

Giant E 1 resonances in Ne 20 observed with the F 19 (p→ γ 0 γ 1 ) 20 Ne reactions

The giant electric dipole resonance built upon the 0/sup +/ ground state of /sup 20/Ne was studied via the /sup 19/F(p-arrow-right,..gamma../sub 0/)/sup 20/Ne reaction. Polarized and unpolarized angular distributions were measured between E/sub x/ = 16.1 and 23.0 MeV (E/sub p/ = 3--10 MeV) and the E1 T-matrix elements extracted. The /sup 1/P, E1 partial wave dominates, but the weaker /sup 3/P (spin flip) term is also resonant. A heuristic doorway state model has been used to fit the pronounced structure in the giant E1 resonance. Data for the giant resonance built on the first excited state as seen in the /sup 19/F(p-arrow-right,..gamma../sub 1/)/sup 20/Ne reaction are presented and discussed. The microscopic, doorway state calculation in a deformed potential of Schmid and Do Dang is in very good agreement with the main features of the results.

El Analogue States in 90Zr Studied with Polarized Proton Capture

Studies of the 89Y(p,γ0) reaction1,2) have revealed the existence of sharp, isolated 1− analogue (IAR) resonances at Ep = 6.15 and 8.01 MeV which have been assigned isospin T> = 6 because of their narrow width and the known parent spectrum of 90Y. We have studied the same reaction with polarized protons in the regions of these two IAR’s in steps of 25 keV with a 30 keV (average) thick target. The angular distributions σ(θ) and the analyzing powers A(θ) have been analyzed according to \( 4\pi \sigma \left( \theta \right) = \sum\limits_{k = 0}^3 {{A_k}{P_k}} \left( \theta \right)and4\pi \sigma \left( \theta \right)A\left( \theta \right) = {\sum\limits_{k = 0}^3 {{B_k}{P_k}} ^1}\left( \theta \right). \).