2018 Impact factor 2.481
Hadrons and Nuclei


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

Peculiarities in fragment mass distribution in the $\bf {^{238}U}$ + $\bf {^{40}Ar}$ (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. Vakhtin3

1  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 $\mathsf{^{238}U}$ + $\mathsf{^{40}Ar}$ (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