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

M. Aïche; M.M. Aléonard; G.Barreau; D. Boivin; F. Bourgine; J.F. Chemin; J.N. Scheurer; T.P. Doan; A. Brondi; G. La Rana; R. Moro; A. Principe; E. Vardaci; D. Curien; G. Duchêne; G. de France; F.A. Beck; B. Haas; J.P. Vivien; F. Hannachi

EPJ

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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EPJ

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

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