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Title: The Interaction of 6He with 197Au and 206Pb

Abstract

Excitation functions have been measured for evaporation residues from compound nuclei formed in the interaction of 6He with 197Au and 206Pb. The transfer reactions leading to 194Au, 196Au and 198Au were also studied for the case of 6He + 197Au. The experiments were performed at the JINR accelerator complex for radioactive beams DRIBs, capable of providing 6He beams of about 10 AMeV maximum energy and an intensity of up to 2x107 pps. The stacked foil activation technique was used directly in the beam extracted from the cyclotron or in the focal plane of the magnetic spectrometer MSP-144. The identification of the reaction products was done by their radioactive {gamma}- or {alpha}-decay. The fusion reactions with the evaporation of two neutrons were characterized by an increase in the cross section compared to statistical model calculations. The analysis of the data in the framework of the statistical model for the decay of excited nuclei when the sequential fusion of 6He was taken into account has shown good agreement between the experimental and the calculated values of the cross sections for the case of sub-Coulomb-barrier fusion in the 206Pb+6He reaction. At the Coulomb barrier unusually high cross section was measured for the productionmore » of 198Au, whereas only an upper limit was determined for the formation of 199Au. Possible mechanisms of formation and decay of transfer reaction products are discussed.« less

Authors:
; ; ; ; ; ;  [1]
  1. Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation)
Publication Date:
OSTI Identifier:
21061838
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: 10.1063/1.2746580; (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 DECAY; COMPOUND NUCLEI; COULOMB FIELD; EXCITATION FUNCTIONS; GOLD 194; GOLD 196; GOLD 197 TARGET; GOLD 198; GOLD 199; HEAVY ION FUSION REACTIONS; HELIUM 6 REACTIONS; JINR; LEAD 206 TARGET; NEUTRONS; RADIOACTIVE ION BEAMS; STATISTICAL MODELS; TRANSFER REACTIONS

Citation Formats

Penionzhkevich, Yu. E., Kalpakchieva, R., Kulko, A. A., Lukyanov, S. M., Maslov, V. A., Skobelev, N. K., and Sobolev, Yu. G. The Interaction of 6He with 197Au and 206Pb. United States: N. p., 2007. Web. doi:10.1063/1.2746580.
Penionzhkevich, Yu. E., Kalpakchieva, R., Kulko, A. A., Lukyanov, S. M., Maslov, V. A., Skobelev, N. K., & Sobolev, Yu. G. The Interaction of 6He with 197Au and 206Pb. United States. doi:10.1063/1.2746580.
Penionzhkevich, Yu. E., Kalpakchieva, R., Kulko, A. A., Lukyanov, S. M., Maslov, V. A., Skobelev, N. K., and Sobolev, Yu. G. Tue . "The Interaction of 6He with 197Au and 206Pb". United States. doi:10.1063/1.2746580.
@article{osti_21061838,
title = {The Interaction of 6He with 197Au and 206Pb},
author = {Penionzhkevich, Yu. E. and Kalpakchieva, R. and Kulko, A. A. and Lukyanov, S. M. and Maslov, V. A. and Skobelev, N. K. and Sobolev, Yu. G.},
abstractNote = {Excitation functions have been measured for evaporation residues from compound nuclei formed in the interaction of 6He with 197Au and 206Pb. The transfer reactions leading to 194Au, 196Au and 198Au were also studied for the case of 6He + 197Au. The experiments were performed at the JINR accelerator complex for radioactive beams DRIBs, capable of providing 6He beams of about 10 AMeV maximum energy and an intensity of up to 2x107 pps. The stacked foil activation technique was used directly in the beam extracted from the cyclotron or in the focal plane of the magnetic spectrometer MSP-144. The identification of the reaction products was done by their radioactive {gamma}- or {alpha}-decay. The fusion reactions with the evaporation of two neutrons were characterized by an increase in the cross section compared to statistical model calculations. The analysis of the data in the framework of the statistical model for the decay of excited nuclei when the sequential fusion of 6He was taken into account has shown good agreement between the experimental and the calculated values of the cross sections for the case of sub-Coulomb-barrier fusion in the 206Pb+6He reaction. At the Coulomb barrier unusually high cross section was measured for the production of 198Au, whereas only an upper limit was determined for the formation of 199Au. Possible mechanisms of formation and decay of transfer reaction products are discussed.},
doi = {10.1063/1.2746580},
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}
}