Superasymmetric fission of heavy nuclei induced by intermediate-energy protons

A. Deppman, E. Andrade-II, V. Guimarães, G. S. Karapetyan, O. A. P. Tavares, A. R. Balabekyan, N. A. Demekhina, J. Adam, F. Garcia, and K. Katovsky

Phys. Rev. C 88, 064609 – Published 13 December 2013

Abstract

In this work we present the results for the investigation of intermediate-mass fragment (IMF) production with the proton-induced reaction at 660 MeV on $^{238}$ U and $^{237}$ Np target. The data were obtained with the LNR Phasotron U-400M Cyclotron at Joint Institute for Nuclear Research (JINR), Dubna, Russia. A total of 93 isotopes, in the mass range of $30 < A < 200$ , were unambiguously identified with high precision. The fragment production cross sections were obtained by means of the induced-activation method in an off-line analysis. Mass-yield distributions were derived from the data and compared with the results of the simulation code CRISP for multimodal fission. A discussion of the superasymmetric fragment production mechanism is also given.

Received 5 September 2013

DOI:https://doi.org/10.1103/PhysRevC.88.064609

Authors & Affiliations

A. Deppman^*, E. Andrade-II^†, V. Guimarães^‡, and G. S. Karapetyan^§

Instituto de Fisica, Universidade de Sao Paulo, P. O. Box 66318, 05315-970 São Paulo, SP, Brazil

O. A. P. Tavares^∥

Centro Brasileiro de Pesquisas Físicas-CBPF/MCTI Rua Dr. Xavier Sigaud, 150, 22290-180 Rio de Janeiro - RJ, Brazil

A. R. Balabekyan^¶

Yerevan State University, Faculty of Physics, Alex Manoogian 1, Yerevan 0025, Armenia

N. A. Demekhina^**

Yerevan Physics Institute, Alikhanyan Brothers 2, Yerevan 0036, Armenia and Joint Institute for Nuclear Research (JINR), Flerov Laboratory of Nuclear Reactions (LNR), Joliot-Curie 6, Dubna 141980, Moscow, Russia

J. Adam^††

Joint Institute for Nuclear Research (JINR), Flerov Laboratory of Nuclear Reactions (LNR), Joliot-Curie 6, Dubna 141980, Moscow, Russia

F. Garcia^‡‡

Departamento de Ciências Exatas e Tecnológicas-DCET Centro de PEsquisas em Ciência e Tecnologias das Radiações - CPqCTR Universidade Estadual de Santa Cruz - UESC, Rodovia Jorge Amado km 16, Ilhéus - BA, Brazil

K. Katovsky^§§

Czech Technical University, Department of Nuclear Reactors, Prague, Czech Republic

^*adeppman@gmail.com
^†esegundo@if.usp.br
^‡valdir@dfn.if.usp.br
^§ayvgay@ysu.am
^∥oaptavares@cbpf.br
^¶balabekyan@ysu.am
^**demekhina@nrmail.jinr.ru
^††iadam@jinr.ru
^‡‡fermingv@gmail.com
^§§k.katovsky@sh.cvut.cz

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Issue

Vol. 88, Iss. 6 — December 2013

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Physical Review C

covering nuclear physics