Eur. Phys. J. A 10, 171-175

Peculiarities in fragment mass distribution in the + (243 MeV) reaction

Yu.V. Pyatkov¹, Yu.E. Penionzhkevich², W.H. Trzaska³, O.I. Osetrov⁴, A.A. Alexandrov², I.A. Alexandrova², J. Äystö³, K.-Th. Brinkmann⁵, S.V. Khlebnikov⁴, V.F. Kushniruk², A.V. Kuznetsov⁴, V.G. Lyapin⁴, V.A. Maslov², M. Mutterer⁶, Z. Radivojevich³, V.A. Rubchenya⁴, Yu.G. Sobolev², G.P. Tiourine⁴ and D.N. Vakhtin<sup>3

1</sup>  Moscow Engineering Physics Institute, Moscow, Russia
²  Flerov Laboratory of Nuclear Reaction, JINR, Dubna, Russia
³  Department of Physics of University of Jyväskylä, Jyväskylä, Finland
⁴  Khlopin Radium Institute, St.Petersburg, Russia
⁵  Technical University, Dresden, Germany
⁶  Technical University, Darmstadt, Germany

pyatkov@nrsun.jinr.ru

(Received: 8 August 2000 / Revised version: 29 December 2000 Communicated by C. Signorini)

Abstract
A pronounced fine structure (FS) in the form of distinct peaks was observed in neutron gated mass spectra from the decay of the ²⁷⁸110 composite system produced in the reaction + (243 MeV) at an initial excitation energy E^*> 70 MeV. The FS peaks are located in the vicinity of mass numbers 70-80, 100, and 130, which correspond to those of magic nuclei (clusters). In the data there is also evidence for a new type of decay -collinear cluster tripartition of an excited nucleus.

PACS
25.70.Lm - Strongly damped collisions.
25.70.Pq - Multifragment emission and correlations.
25.85.Ge - Charged-particle-induced fission.

© Società Italiana di Fisica, Springer-Verlag 2001