Measurement of isospin mixing at a finite temperature in 80Zr via giant dipole resonance decay
- Corsi, A.
- Wieland, O.
- Barlini, S.
- Bracco, A.
- Camera, F.
- Kravchuk, V. L.
- Baiocco, G.
- Bardelli, L.
- Benzoni, G.
- Bini, M.
- Blasi, N.
- Brambilla, S.
- Bruno, M.
- Casini, G.
- Ciemala, M.
- Cinausero, M.
- Crespi, F. C. L.
- D'Agostino, M.
- Degerlier, M.
- Giaz, A.
- Gramegna, F.
- Kmiecik, M.
- Leoni, S.
- Maj, A.
- Marchi, T.
- Mazurek, K.
- Meczynski, W.
- Million, B.
- Montanari, D.
- Morelli, L.
- Myalski, S.
- Nannini, A.
- Nicolini, R.
- Pasquali, G.
- Poggi, G.
- Vandone, V.
- Vannini, G.
DOIAbstract
Isospin mixing in the hot compound nucleus Zr-80 was studied by measuring and comparing the gamma-ray emission from the fusion reactions Ca-40 + Ca-40 at E-beam = 200 MeV and Cl-37 + Ca-44 at E-beam = 153 MeV. The gamma yield associated with the giant dipole resonance is found to be different in the two reactions because, in self-conjugate nuclei, the E1 selection rules forbid the decay between states with isospin I = 0. The degree of mixing is deduced from statistical-model analysis of the gamma-ray spectrum emitted by the compound nucleus Zr-80 with the standard parameters deduced from the gamma decay of the nucleus Rb-81. The results are used to deduce the zero-temperature value, which is then compared with the latest predictions. The Co...
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