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.;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. - STAMPA. - 84:(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

BARLINI, SANDRO;BARDELLI, LUIGI;BINI, MAURIZIO;CASINI, GIOVANNI;NANNINI, ADRIANA;PASQUALI, GABRIELE;POGGI, GIACOMO;
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.
2011
84
041304-1
041304-5
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.;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 identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/776870
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