Investigation of pion-nucleus interactions. Progress report, April 1, 1990--March 31, 1991
The double isovector giant state has been observed in the ({pi}{sup {minus}}, {pi}{sup +}) {Delta}T{sub z} = +2 double-charge-exchange reaction on {sup 13}C, {sup 27}Al, {sup 40}Ca, {sup 56}Fe, {sup 59}Co, and {sup 93}Nb. The resonances observed in the ({pi}{sup {minus}}, {pi}{sup +}) reaction are closely related via Coulomb displacement energy and isospin symmetry to the resonances measured in the inverse ({pi}{sup +}, {pi}{sup {minus}}) reaction on the same nuclei. The new observations provide a direct determination of the upper isospin component of the double giant dipole state, which is generally very weak in the ({pi}{sup +}, {pi}{sup {minus}}) reaction. The comparison between the double dipole in the two double-charge-exchange modes gives valuable information on the isospin splitting and the Pauli-blocking effects for isotensor transitions.
- Research Organization:
- Texas Univ., Austin, TX (United States). Dept. of Physics
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG05-87ER40343
- OSTI ID:
- 10107138
- Report Number(s):
- DOE/ER/40343--5; ON: DE92004061
- Country of Publication:
- United States
- Language:
- English
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