Isospin mixing in the hot compound nucleus 80Zr was studied by measuring and comparing the γ-ray emission from the fusion reactions 40Ca+40Ca at Ebeam=200 MeV and 37Cl+44Ca at Ebeam=153 MeV. The γ 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 γ-ray spectrum emitted by the compound nucleus 80Zr with the standard parameters deduced from the γ decay of the nucleus 81Rb. 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 80Zr via giant dipole resonance decay

BRUNO, MAURO;VANNINI, GIANNI
2011

Abstract

Isospin mixing in the hot compound nucleus 80Zr was studied by measuring and comparing the γ-ray emission from the fusion reactions 40Ca+40Ca at Ebeam=200 MeV and 37Cl+44Ca at Ebeam=153 MeV. The γ 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 γ-ray spectrum emitted by the compound nucleus 80Zr with the standard parameters deduced from the γ decay of the nucleus 81Rb. 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.
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
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/107489
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