Isospin Mixing in Zr-80: From Finite to Zero Temperature

Abstract : The isospin mixing was deduced in the compound nucleus Zr-80 at an excitation energy of E* = 54 MeV from the gamma decay of the giant dipole resonance. The reaction Ca-40 + Ca-40 at E-beam = 136 MeV was used to form the compound nucleus in the isospin I = 0 channel, while the reaction Cl-37 + Ca-44 at E-beam = 95 MeV was used as the reference reaction. The. rays were detected with the AGATA demonstrator array coupled with LaBr3:Ce detectors. The temperature dependence of the isospin mixing was obtained and the zero-temperature value deduced. The isospin-symmetry-breaking correction delta(C) used for the Fermi superallowed transitions was extracted and found to be consistent with beta-decay data.
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Submitted on : Tuesday, January 5, 2016 - 3:35:00 PM
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S. Ceruti, F. Camera, A. Bracco, R. Avigo, G. Benzoni, et al.. Isospin Mixing in Zr-80: From Finite to Zero Temperature . Physical Review Letters, American Physical Society, 2015, 115 (22), pp.222502. ⟨10.1103/PhysRevLett.115.222502⟩. ⟨in2p3-01251053⟩

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