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 Coulomb spreading width is found to be independent of temperature.
Measurement of isospin mixing at a finite temperature in Zr-80 via giant dipole resonance decay / A. Corsi, O. Wieland, S. Barlini, A. Bracco, F. Camera, V. L. Kravchuk, G. Baiocco, L. Bardelli, G. Benzoni, M. Bini, N. Blasi, S. Brambilla, M. Bruno, G. Casini, M. Ciemala, M. Cinausero, F. C. L. Crespi, M. D'Agostino, M. Degerlier, A. Giaz, F. Gramegna, M. Kmiecik, S. Leoni, A. Maj, T. Marchi, K. Mazurek, W. Meczynski, B. Million, D. Montanari, L. Morelli, S. Myalski, A. Nannini, R. Nicolini, G. Pasquali, G. Poggi, V. Vandone, G. Vannini. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 84:4(2011), pp. 041304.1-041304.5. [10.1103/PhysRevC.84.041304]
Measurement of isospin mixing at a finite temperature in Zr-80 via giant dipole resonance decay
A. Bracco;F. Camera;F.C.L. Crespi;A. Giaz;S. Leoni;
2011
Abstract
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 Coulomb spreading width is found to be independent of temperature.File | Dimensione | Formato | |
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