skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Excitation Functions for Complete Fusion and Transfer Reactions in the Interaction of 4He Nuclei with 197Au

Abstract

Excitation functions have been measured for the fusion reaction 197Au({alpha}xn)201-xnTl with the evaporation of x neutrons (0{<=}x{<=}3) in the energy range 14-36 MeV. The induced-activation method was used for registration and identification of the reaction products. The experimental cross sections for the (1-3)-neutron evaporation residues are in good agreement with the results known from literature. For the radiation capture reaction 197Au({alpha},{gamma})201Tl, the upper limit was obtained essentially lower. The excitation functions for the measured reactions are compared with calculations in the frame of the statistical model, as well as with formerly measured similar data with a 6He beam.

Authors:
; ; ; ; ; ; ;  [1]
  1. Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna (Russian Federation)
Publication Date:
OSTI Identifier:
21061801
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 912; Journal Issue: 1; Conference: International symposium on exotic nuclei, Khanty-Mansiysk (Russian Federation), 17-22 Jul 2006; Other Information: DOI: 10.1063/1.2746596; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA PARTICLES; ALPHA REACTIONS; CAPTURE; COMPARATIVE EVALUATIONS; EVAPORATION MODEL; EXCITATION FUNCTIONS; GOLD 197 TARGET; HEAVY ION FUSION REACTIONS; HELIUM 6 REACTIONS; MEV RANGE; NEUTRON EMISSION; NEUTRONS; PHOTONS; STATISTICAL MODELS; THALLIUM 201; TRANSFER REACTIONS

Citation Formats

Kulko, A. A., Demekhina, N. A., Kalpakchieva, R., Muzychka, Yu. A., Penionzhkevich, Yu. E., Rassadov, D. N., Skobelev, N. K., and Testov, D. A. Excitation Functions for Complete Fusion and Transfer Reactions in the Interaction of 4He Nuclei with 197Au. United States: N. p., 2007. Web. doi:10.1063/1.2746596.
Kulko, A. A., Demekhina, N. A., Kalpakchieva, R., Muzychka, Yu. A., Penionzhkevich, Yu. E., Rassadov, D. N., Skobelev, N. K., & Testov, D. A. Excitation Functions for Complete Fusion and Transfer Reactions in the Interaction of 4He Nuclei with 197Au. United States. doi:10.1063/1.2746596.
Kulko, A. A., Demekhina, N. A., Kalpakchieva, R., Muzychka, Yu. A., Penionzhkevich, Yu. E., Rassadov, D. N., Skobelev, N. K., and Testov, D. A. Tue . "Excitation Functions for Complete Fusion and Transfer Reactions in the Interaction of 4He Nuclei with 197Au". United States. doi:10.1063/1.2746596.
@article{osti_21061801,
title = {Excitation Functions for Complete Fusion and Transfer Reactions in the Interaction of 4He Nuclei with 197Au},
author = {Kulko, A. A. and Demekhina, N. A. and Kalpakchieva, R. and Muzychka, Yu. A. and Penionzhkevich, Yu. E. and Rassadov, D. N. and Skobelev, N. K. and Testov, D. A.},
abstractNote = {Excitation functions have been measured for the fusion reaction 197Au({alpha}xn)201-xnTl with the evaporation of x neutrons (0{<=}x{<=}3) in the energy range 14-36 MeV. The induced-activation method was used for registration and identification of the reaction products. The experimental cross sections for the (1-3)-neutron evaporation residues are in good agreement with the results known from literature. For the radiation capture reaction 197Au({alpha},{gamma})201Tl, the upper limit was obtained essentially lower. The excitation functions for the measured reactions are compared with calculations in the frame of the statistical model, as well as with formerly measured similar data with a 6He beam.},
doi = {10.1063/1.2746596},
journal = {AIP Conference Proceedings},
number = 1,
volume = 912,
place = {United States},
year = {Tue May 22 00:00:00 EDT 2007},
month = {Tue May 22 00:00:00 EDT 2007}
}
  • Excitation functions are measured for the fusion reactions {sup 197}Au({sup 4}He, xn){sup 201-xn}Tl that are induced by alpha-particle interaction with gold nuclei in the energy range 14-36 MeV and in which x neutrons (0 {<=} x {<=} 3) are evaporated. The stack-activation technique was used to record and separate reaction products. Experimental data on the fusion reactions followed by evaporation of one to three neutrons agree with results of previous studies. For the radiative-capture reaction {sup 197}Au({sup 4}He,{gamma}){sup 201}Tl, the upper limit on the cross section proved to be much lower. The excitation functions for the reactions subjected to measurementsmore » are compared with the results of calculations based on the statistical model and with the results of an experiment performed previously in a {sup 6}He beam.« less
  • The fragment angular distributions and excitation functions of the fission following complete fusion (FFCF) have been measured after separating them from targetlike-fragment fission (TLFF) for the {sup 19}F+{sup 232}Th system in the bombarding energy range of 84.5 to 106.5 MeV. The fraction of the targetlike-fragment fission was observed to increase with decreasing bombarding energy below the Coulomb barrier. The excitation function for fission following complete fusion reaction agrees well with coupled channel calculations. However, the {l_angle}{ital l}{sup 2}{r_angle} values derived from the fragment anisotropy data of the FFCF events are found to be much larger than those calculated using themore » coupled channel transmission coefficient values. The discrepancy between the experimental and calculated {l_angle}{ital l}{sup 2}{r_angle} values increases as the bombarding energy is decreased below the barrier.« less
  • With the view to study complete and incomplete fusion in heavy ion induced reactions, experiments have been carried out for measuring excitation functions for several reactions in the system {sup 16}O+{sup 169}Tm at energies near the Coulomb barrier to well above it, using an activation technique. The measured excitation functions have been compared with those calculated theoretically using three different computer codes viz., ALICE-91, CASCADE and PACE2. The enhancement of experimentally measured cross sections for alpha emission channels over their theoretical prediction has been attributed to the fact that these residues are formed not only by complete fusion but alsomore » through incomplete fusion. In order to separate out the relative contributions of complete and incomplete fusion, the recoil range distributions of eight residues produced in the interaction of {sup 16}O with {sup 169}Tm at {approx_equal}87 MeV have been measured. The recoil range distributions indicate significant contributions from incomplete fusion at {approx_equal}87 MeV for some of the channels.« less
  • No abstract prepared.