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Effect of E1 decay in the population of superdeformed structures |
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| Authors: | G Benzoni A Bracco F Camera S Leoni B Million A Maj A Algora A Axelsson M Bergstrm N Blasi M Castoldi S Frattini A Gadea B Herskind M Kmiecik G Lo Bianco J Nyberg M Pignanelli J Styczen O Wieland M Zieblinski A Zucchiatti |
| Institution: | a Dipartimento di Fisica, Universitá di Milano and INFN, via Celoria 16, 20133, Milano, Italy b Niewodniczanski Institute of Nuclear Physics, 31-342, Krakow, Poland c Laboratori Nazionali di Legnaro, via Romea, Legnaro (PD), Italy d Department of Neutron Research, Uppsala University, S-75121, Uppsala, Sweden e The Niels Bohr Institute, Blegdamsvej 15-17, 2100, Copenhagen, Denmark f INFN sezione di Genova, Genova, Italy g Dipartimento di Fisica, Universitá di Camerino e INFN Perugia, Camerino, Italy |
| Abstract: | Spectra of the yrast and excited superdeformed bands, forming the E2 quasi-continuum, are measured with the EUROBALL array for the nucleus 143Eu, in coincidence with high-energy γ-rays (Eγ>3 MeV). It is found that the intensity population of the superdeformed states is enhanced by a factor of ≈1.6 when a coincidence with a γ-ray with energy >6 MeV is required, in reasonable agreement with the increase of the line shape of the Giant Dipole Resonance built on a superdeformed configuration. This result shows that when an high energy E1 γ-ray is involved in the decay it is more likely connected with a SD rather than a ND nucleus. In addition, the analysis of the rotational quasi-continuum suggests the presence of a superdeformed component. The data are also compared and found consistent with simulation calculations of the relative intensities of the SD states, including the E1 decay of superdeformed nature. |
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