2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 6, 121-129

Alpha energy distribution as a probe for the feeding of ND and SD bands in 151,152Dy nuclei

M. Aïche1 - M.M. Aléonard1 - G.Barreau1 - D. Boivin1 - F. Bourgine1 - J.F. Chemin1 - J.N. Scheurer1 - T.P. Doan1 - A. Brondi2 - G. La Rana2 - R. Moro2 - A. Principe2 - E. Vardaci2 - D. Curien3 - G. Duchêne3 - G. de France4 - F.A. Beck3 - B. Haas3 - J.P. Vivien3 - F. Hannachi5

1 Centre d'Etudes Nucleaires de Bordeaux-Gradignan, IN2P3-CNRS and Université de Bordeaux I, 33175 Gradignan Cedex, France (e-mail: aiche@cenbg.in2p3.fr)
2 Istituto Nazionale di Fisica Nucleare and Dipartimento di Scienze Fisiche, Complesso Universitario di Monte S. Angelo, Via Cintia, 80126 Napoli, Italy
3 Institut de Recherches Subatomiques, IN2P3-CNRS and Université L. Pasteur, 22 rue du Loess, 67037 Strasbourg, France
4 GANIL,IN2P3-CEA, Bd H. Bequerel, 14076 Caen Cedex, France
5 Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, IN2P3-CNRS, bât. 104, 91405 Orsay Campus, France

Received: 11 March 1999 / Revised version: 24 June 1999 Communicated by D. Schwalm

Abstract
The study of the $\alpha$-particle energy distributions associated with ND and SD states in 151,152Dy has been carried out. The Dy isotopes were produced in the reaction 37Cl+123Sb at 191 MeV via the ($\alpha$5n) and ($\alpha$4n) channels, respectively. In 151Dy the $\alpha$-particle energy distributions associated to ND and SD are very different from each other, both at the low and high energy sides inducing a difference of 3 MeV in the $\alpha$-particle mean energy. In 152Dy the situation is different; the $\alpha$-particle spectral shapes are similar and a difference in the $\alpha$-particle mean energy of only 0.7 MeV is deduced. A description in terms of energy localization of entry states is given.

PACS
21.10.Re Collective levels - 21.10.G Nuclear deformations - 25.60.Pj Fusion reactions - 27.70.+q $150 \leq A \leq 180$


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