Formation and deexcitation of the composite nucleus in the Ni + Al reaction at 28 A$\cdot$MeV

L. Lebreton; D. Benchekroun; E. Bisquer; B. Chambon; B. Cheynis; A. Demeyer; D. Doré; D. Drain; E. Gerlic; D. C. R. Guinet; P. Lautesse; C. Pastor; M. Stern; L. Vagneron; C. Vincent-Donnet; A. Chabane; A.J. Cole; P. Désesquelles; A. Giorni; D. Heuer; A. Lleres; J.B. Viano

doi:doi:10.1007/s100500050187

EPJ

Formation and deexcitation of the composite nucleus in the
Ni + Al reaction at 28 A $\cdot$ MeV

L. Lebreton¹ - D. Benchekroun¹ - E. Bisquer¹ - B. Chambon¹ - B. Cheynis¹ - A. Demeyer¹ - D. Doré³ - D. Drain¹ - E. Gerlic¹ - D. C. R. Guinet¹ - P. Lautesse¹ - C. Pastor¹ - M. Stern¹ - L. Vagneron¹ - C. Vincent-Donnet¹ - A. Chabane² - A.J. Cole² - P. Désesquelles² - A. Giorni² - D. Heuer² - A. Lleres² - J.B. Viano²

¹ Institut de Physique Nucléaire de Lyon (CNRS-IN2P3 et Université Claude Bernard), 43 Bd du 11 novembre 1918, F-69622 Villeurbanne Cedex, France.
² Institut des Sciences Nucléaires de Grenoble (CNRS-IN2P3 et Université Joseph Fourier), 53 Avenue des Martyrs, F-38026 Grenoble Cedex, France.
³ Centre d'Etudes Nucléaire de Saclay (CEA DAPNIA/SphN), 91191 Gif sur Yvette Cedex, France

Received: 11 February 1998 / Revised version: 1 August 1998 Communicated by V. Metag

Abstract
The formation and the deexcitation of the composite nucleus formed during the Ni + Al reaction at 28 A $\cdot$ MeV has been studied with the $4 \pi$ multidetector AMPHORA. A rigourous selection of the experimental data is described in order to extract a central collision sample. Then different models are compared to the data. The incomplete fusion process is in agreement with the data. The azimuthal angle correlations of He-Li and Li-Li pairs have been used to discriminate sequential or instantaneous emission. The sequential deexcitation is more consistent with all the data. The different analyses allow to describe all the characteristics of the compound nucleus and finally a fusion cross section of $300 \pm 100~mbarn$ has been measured.

PACS
25.70 Pq Multifragment emission and correlations

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EPJ

Formation and deexcitation of the composite nucleus in the Ni + Al reaction at 28 AMeV

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Formation and deexcitation of the composite nucleus in the
Ni + Al reaction at 28 A $\cdot$ MeV