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Evidence for octupole correlations in 124Ba, 125Ba

Abstract : The gamma decay of the nuclei 124,125Ba has been investigated by means of the EUROBALL spectrometer, coupled to the DIAMANT array of charged-particle detectors, using the reaction 64Ni + 64Ni at E_{beam}=255 and 261 MeV. In the nucleus 125Ba six new E1 transitions have been found to link opposite-parity bands currently interpreted as \nu d_{5/2(+g_{7/2},nu h_11/2}structures. The previously unknown Jpi=3- level in the nucleus $^{124}$Ba has also been identified; its excitation energy is accurately reproduced by a microscopic calculation including octupole correlations. Both issues are bolstered by sizable B(E1)/B(E2) ratios.
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Submitted on : Monday, January 23, 2006 - 2:38:47 PM
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P. Mason, G. Benzoni, A. Bracco, F. Camera, B. Million, et al.. Evidence for octupole correlations in 124Ba, 125Ba. Physical Review C, American Physical Society, 2005, 72, pp.064315. ⟨10.1103/PhysRevC.72.064315⟩. ⟨in2p3-00025456⟩



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