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

Title: Measurement of the fusion probability, P CN , for hot fusion reactions

Abstract

Background: The cross section for forming a heavy evaporation residue in fusion reactions depends on the capture cross section, the fusion probability, P-CN, i.e., the probability that the projectile-target system will evolve inside the fission saddle point to form a completely fused system rather than reseparating (quasifission), and the survival of the completely fused system against fission. P-CN is the least known of these quantities. Purpose: We want to determine P-CN for the reactions of 101.2 MeV O-18, 147.3 MeV Mg-26, 170.9 MeV Si-30, and 195.3 MeV S-36 with Au-197. Methods: We measured the fission fragment angular distributions for these reactions and used the formalism of Back to deduce the fusion-fission and quasifission cross sections. From these quantities we deduced P-CN for each reaction. Results: The values of P-CN for the reactions of 101.2 MeV O-18, 147.3 MeV Mg-26, 170.9 MeV Si-30, and 195.3 MeV S-36 with Au-197 are 0.66, 1.00, 0.06, and 0.13, respectively. Conclusions: The new measured values of P-CN agree roughly with the semiempirical systematic dependence of P-CN upon fissility for excited nuclei.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Nuclear Physics
OSTI Identifier:
1418346
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 88; Journal Issue: 1; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Yanez, R., Loveland, W., Barrett, J. S., Yao, L., Back, B. B., Zhu, S., and Khoo, T. L. Measurement of the fusion probability, PCN, for hot fusion reactions. United States: N. p., 2013. Web. doi:10.1103/PhysRevC.88.014606.
Yanez, R., Loveland, W., Barrett, J. S., Yao, L., Back, B. B., Zhu, S., & Khoo, T. L. Measurement of the fusion probability, PCN, for hot fusion reactions. United States. doi:10.1103/PhysRevC.88.014606.
Yanez, R., Loveland, W., Barrett, J. S., Yao, L., Back, B. B., Zhu, S., and Khoo, T. L. Mon . "Measurement of the fusion probability, PCN, for hot fusion reactions". United States. doi:10.1103/PhysRevC.88.014606.
@article{osti_1418346,
title = {Measurement of the fusion probability, PCN, for hot fusion reactions},
author = {Yanez, R. and Loveland, W. and Barrett, J. S. and Yao, L. and Back, B. B. and Zhu, S. and Khoo, T. L.},
abstractNote = {Background: The cross section for forming a heavy evaporation residue in fusion reactions depends on the capture cross section, the fusion probability, P-CN, i.e., the probability that the projectile-target system will evolve inside the fission saddle point to form a completely fused system rather than reseparating (quasifission), and the survival of the completely fused system against fission. P-CN is the least known of these quantities. Purpose: We want to determine P-CN for the reactions of 101.2 MeV O-18, 147.3 MeV Mg-26, 170.9 MeV Si-30, and 195.3 MeV S-36 with Au-197. Methods: We measured the fission fragment angular distributions for these reactions and used the formalism of Back to deduce the fusion-fission and quasifission cross sections. From these quantities we deduced P-CN for each reaction. Results: The values of P-CN for the reactions of 101.2 MeV O-18, 147.3 MeV Mg-26, 170.9 MeV Si-30, and 195.3 MeV S-36 with Au-197 are 0.66, 1.00, 0.06, and 0.13, respectively. Conclusions: The new measured values of P-CN agree roughly with the semiempirical systematic dependence of P-CN upon fissility for excited nuclei.},
doi = {10.1103/PhysRevC.88.014606},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 1,
volume = 88,
place = {United States},
year = {2013},
month = {7}
}

Works referenced in this record:

Entrance-Channel Effects in Suppression of Fusion of Heavy Nuclei
journal, January 2008

  • Siwek-WilczyŃSka, K.; Borowiec, A.; Skwira-Chalot, I.
  • International Journal of Modern Physics E, Vol. 17, Issue 01
  • DOI: 10.1142/S0218301308009501

Fusion-fission and quasifission competition in the 32 S+ 184 W reaction
journal, February 2011


Entrance channel effects in the fusion-fission time scales from studies of prescission neutron multiplicities
journal, February 1994


Superheavy nuclei and quasi-atoms produced in collisions of transuranium ions
journal, March 2006


Sharp change-over from compound nuclear fission to quasifission
journal, May 2009


Angular Distribution of Fragments from Fission Induced by Heavy Ions in Gold and Bismuth
journal, March 1963

  • Viola, Victor E.; Thomas, T. Darrah; Seaborg, Glenn T.
  • Physical Review, Vol. 129, Issue 6
  • DOI: 10.1103/PhysRev.129.2710

Measurement of the fusion probability P CN for the reaction of Ti 50 with Pb 208
journal, November 2007


Predominant Time Scales in Fission Processes in Reactions of S, Ti and Ni with W: Zeptosecond versus Attosecond
journal, February 2011


Extraction of probability of compound-nucleus formation
journal, March 2010


Equilibrium configurations of rotating charged or gravitating liquid masses with surface tension. II
journal, February 1974


Precision Measurements of Correlated Energies and Velocities of Cf 252 Fission Fragments
journal, February 1965


Mass dependence of fragment anisotropy in the fission of B 11 + 237 Np and O 16 + 209 Bi systems
journal, October 1996


Empirical formula for the average equilibrium charge-state of heavy ions behind various foils
journal, September 1982

  • Shima, Kunihiro; Ishihara, Toyoyuki; Mikumo, Takashi
  • Nuclear Instruments and Methods in Physics Research, Vol. 200, Issue 2-3
  • DOI: 10.1016/0167-5087(82)90493-8

Angular distributions in heavy-ion-induced fission
journal, July 1985


Dynamics of the fusion process
journal, October 1982


Synthesis of superheavy nuclei: A search for new production reactions
journal, September 2008


Investigation of the reaction 64Ni+238U being an option of synthesizing element 120
journal, March 2010


Non-equilibrium processes in Heavy-ion induced Fission Reactions
journal, February 2011


Fusion-fission and neutron-evaporation-residue cross-sections in 40Ar- and 50Ti-induced fusion reactions
journal, May 1984


Investigation on the quasifission process by theoretical analysis of experimental data of fissionlike reaction products
journal, February 2011


Quasi-fission — The mass-drift mode in heavy-ion reactions
journal, July 1985


Competition between fusion-fission and quasi-fission in the reaction 28Si+208Pb
journal, September 1995


Srim-2003
journal, June 2004

  • Ziegler, James F.
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 219-220
  • DOI: 10.1016/j.nimb.2004.01.208

Analysis of fissionability data at high excitation energies: I. The level density problem
journal, June 1981

  • Reisdorf, W.
  • Zeitschrift f�r Physik A: Atoms and Nuclei, Vol. 300, Issue 2-3
  • DOI: 10.1007/BF01412298

Dynamics of dinuclear system formation and its decay in heavy ion collisions
journal, February 2011


On the Production of Superheavy Elements
journal, December 2000


Influence of entrance channels on the formation of superheavy nuclei in massive fusion reactions
journal, May 2010


Fission following capture reactions of S 32 + Pb 208
journal, August 1983


Effects of nuclear structure on quasi-fission
journal, January 2012


Dynamics of Capture and Fusion in Heavy Ion Collisions
journal, January 2004

  • Nasirov, A. K.; Giardina, G.; Muminov, A. I.
  • Acta Physica Hungarica A) Heavy Ion Physics, Vol. 19, Issue 1-2
  • DOI: 10.1556/APH.19.2004.1-2.16

Dynamical hindrance to compound-nucleus formation in heavy-ion reactions
journal, October 1986


Dynamical Hindrance of Fusion of Superheavy Nuclei
journal, March 2006

  • BŁOcki, J.; Shvedov, L.; WilczyŃSki, J.
  • International Journal of Modern Physics E, Vol. 15, Issue 02
  • DOI: 10.1142/S0218301306004302

Absence of entrance channel effects in fission fragment anisotropies of the Fr 215 compound nucleus
journal, August 2009


Note on Interpretation of Fission-Fragment Angular Distributions at Moderate Excitation Energies
journal, January 1969


Strong evidence for quasifission in asymmetric reactions forming Po 202
journal, February 2008


Macroscopic model of rotating nuclei
journal, June 1986


Conclusive evidence of quasifission in reactions forming the Rn 210 compound nucleus
journal, May 2010


The Dynamics of Nuclear Coalescence or Reseparation
journal, July 1981


Distribution of reaction strength in 32 S + 182 W collisions
journal, October 1987


Excitation functions for Fr 208 211 produced in the O 18 + Au 197 fusion reaction
journal, January 2005


Fusion enhancement in the reactions of neutron-rich nuclei
journal, October 2009


Fusion by diffusion. II. Synthesis of transfermium elements in cold fusion reactions
journal, January 2005


Peculiarities of sub-barrier reactions with heavy ions
journal, February 2011


Role of mass Asymmetry in Fusion of Super-Heavy Nuclei
journal, February 2007

  • Siwek-WilczyŃSka, K.; Skwira-Chalot, I.; WilczyŃSki, J.
  • International Journal of Modern Physics E, Vol. 16, Issue 02
  • DOI: 10.1142/S0218301307005910

Fission and quasifission modes in heavy-ion-induced reactions leading to the formation of Hs *
journal, June 2011


Nuclear Fission
journal, August 1974

  • Vandenbosch, R.; Huizenga, J. R.; Nix, J. R.
  • Physics Today, Vol. 27, Issue 8
  • DOI: 10.1063/1.3128816

Synthetic Paths to the Heaviest Elements
journal, March 2013


Entrance channel dependence of quasifission in reactions forming Th 220
journal, March 2008


Quasifission processes in Ca 40 , 48 + Sm 144 , 154 reactions
journal, June 2007


Low-energy collisions of heavy nuclei: dynamics of sticking, mass transfer and fusion
journal, October 2006

  • Zagrebaev, Valery; Greiner, Walter
  • Journal of Physics G: Nuclear and Particle Physics, Vol. 34, Issue 1
  • DOI: 10.1088/0954-3899/34/1/001

Fusion and quasi-fission in the formation of heavy elements
journal, January 2011


Fission barriers for even-even superheavy nuclei
journal, July 2010


Complete fusion and quasifission in reactions between heavy ions
journal, June 1985


Two Distinct Quasifission Modes in the S 32 + Th 232 Reaction
journal, August 2008


Capture reactions in the Ca 4 0 , 4 8 + 197 Au and Ca 4 0 , 4 8 + 208 Pb systems
journal, June 1992

  • Pacheco, A. J.; Fernández Niello, J. O.; DiGregorio, D. E.
  • Physical Review C, Vol. 45, Issue 6
  • DOI: 10.1103/PhysRevC.45.2861

Entrance-channel effects in quasifission reactions
journal, April 1996


Isotopic dependence of fusion cross sections in reactions with heavy nuclei
journal, September 2000


Nuclear structure in cold rearrangement processes in fission and fusion
journal, January 1999


Fission and quasifission in U-induced reactions
journal, July 1987


How well do we understand the synthesis of heavy elements by heavy-ion induced fusion?
journal, March 1992

  • Reisdorf, W.; Sch�del, M.
  • Zeitschrift f�r Physik A Hadrons and Nuclei, Vol. 343, Issue 1
  • DOI: 10.1007/BF01291597

Dynamical aspects of nucleus-nucleus collisions
journal, December 1982