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Title: Fusion of radioactive 132Sn with 64Ni

Abstract

Evaporation residue and fission cross sections of radioactive 132Sn on 64Ni were measured near the Coulomb barrier. A large subbarrier fusion enhancement was observed. Coupled-channel calculations, including inelastic excitation of the projectile and target, and neutron transfer are in good agreement with the measured fusion excitation function. When the change in nuclear size and shift in barrier height are accounted for, there is no extra fusion enhancement in 132Sn+64Ni with respect to stable Sn+64Ni. A systematic comparison of evaporation residue cross sections for the fusion of even 112-124Sn and 132Sn with 64Ni is presented.

Authors:
 [1];  [1];  [1];  [2];  [1];  [3];  [1];  [1];  [1];  [1];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [10]
  1. ORNL
  2. Oak Ridge National Laboratory (ORNL)
  3. {nmn} [ORNL
  4. Aarhus University
  5. University of Notre Dame, IN
  6. Gonzaga University
  7. State University of New York, Oswego
  8. Rutgers University
  9. University of Tennessee, Knoxville (UTK)
  10. Oregon State University
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Holifield Radioactive Ion Beam Facility
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1017396
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review C; Journal Volume: 75; Journal Issue: 5
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COULOMB FIELD; CROSS SECTIONS; EVAPORATION; EXCITATION; EXCITATION FUNCTIONS; FISSION; NEUTRON TRANSFER; PROJECTILES; RESIDUES

Citation Formats

Liang, J Felix, Shapira, Dan, Beene, James R, Gross, C. J., Varner Jr, Robert L, Galindo-Uribarri, Alfredo, Gomez Del Campo, Jorge, Hausladen, Paul, Mueller, Paul Edward, Stracener, Daniel W, Andersen, J. U., Kolata, Jim J, Bierman, Jeff D, Caraley, Anne L, Jones, K. L., Larochelle, Y, Loveland, Walter, and Peterson, Don. Fusion of radioactive 132Sn with 64Ni. United States: N. p., 2007. Web. doi:10.1103/PhysRevC.75.054607.
Liang, J Felix, Shapira, Dan, Beene, James R, Gross, C. J., Varner Jr, Robert L, Galindo-Uribarri, Alfredo, Gomez Del Campo, Jorge, Hausladen, Paul, Mueller, Paul Edward, Stracener, Daniel W, Andersen, J. U., Kolata, Jim J, Bierman, Jeff D, Caraley, Anne L, Jones, K. L., Larochelle, Y, Loveland, Walter, & Peterson, Don. Fusion of radioactive 132Sn with 64Ni. United States. doi:10.1103/PhysRevC.75.054607.
Liang, J Felix, Shapira, Dan, Beene, James R, Gross, C. J., Varner Jr, Robert L, Galindo-Uribarri, Alfredo, Gomez Del Campo, Jorge, Hausladen, Paul, Mueller, Paul Edward, Stracener, Daniel W, Andersen, J. U., Kolata, Jim J, Bierman, Jeff D, Caraley, Anne L, Jones, K. L., Larochelle, Y, Loveland, Walter, and Peterson, Don. Mon . "Fusion of radioactive 132Sn with 64Ni". United States. doi:10.1103/PhysRevC.75.054607.
@article{osti_1017396,
title = {Fusion of radioactive 132Sn with 64Ni},
author = {Liang, J Felix and Shapira, Dan and Beene, James R and Gross, C. J. and Varner Jr, Robert L and Galindo-Uribarri, Alfredo and Gomez Del Campo, Jorge and Hausladen, Paul and Mueller, Paul Edward and Stracener, Daniel W and Andersen, J. U. and Kolata, Jim J and Bierman, Jeff D and Caraley, Anne L and Jones, K. L. and Larochelle, Y and Loveland, Walter and Peterson, Don},
abstractNote = {Evaporation residue and fission cross sections of radioactive 132Sn on 64Ni were measured near the Coulomb barrier. A large subbarrier fusion enhancement was observed. Coupled-channel calculations, including inelastic excitation of the projectile and target, and neutron transfer are in good agreement with the measured fusion excitation function. When the change in nuclear size and shift in barrier height are accounted for, there is no extra fusion enhancement in 132Sn+64Ni with respect to stable Sn+64Ni. A systematic comparison of evaporation residue cross sections for the fusion of even 112-124Sn and 132Sn with 64Ni is presented.},
doi = {10.1103/PhysRevC.75.054607},
journal = {Physical Review C},
number = 5,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • Evaporation residue and fission cross sections of radioactive 132Sn on 64Ni were measured. Statistical model calculations using parameters simultaneously fitting stable Sn+64Ni data reproduce the 132Sn induced reaction very well. A large sub-barrier fusion enhancement was observed. The enhancement can be accounted for by coupled-channels calculations including inelastic excitation of the projectile and target, and neutron transfer.
  • Evaporation residue (ER) production from several isotopes of Sn and Te bombarding Ni targets at energies near and below the Coulomb barrier was measured. Measured ER data were compared with the predictions of sub-barrier fusion calculated in a WKB approximation. These comparisons are used to study effects of neutron excess and neutron transfer on the sub-barrier fusion cross sections for reactions induced by heavy nuclei.
  • The (d,p) neutron transfer and (d,d) elastic scattering reactions were measured in inverse kinematics using a radioactive ion beam of 132Sn at 630 MeV. The elastic scattering data were taken in a region where Rutherford scattering dominated the reaction, and nuclear effects account for less than 8% of the elastic scattering cross section. The magnitude of the nuclear effects, in the angular range studied, was found to be independent of the optical potential used, allowing the transfer data to be normalized in a reliable manner. The neutron-transfer reaction populated a previously unmeasured state at 1363 keV, which is most likelymore » the single-particle 3p1/2 state expected above the N = 82 shell closure. The data were analyzed using finite-range adiabatic-wave calculations and the results compared with the previous analysis using the distorted-wave Born approximation. Angular distributions for the ground and first-excited states are consistent with the previous tentative spin and parity assignments. Spectroscopic factors extracted from the differential cross sections are similar to those found for the one-neutron states beyond the benchmark doubly magic nucleus 208Pb.« less
  • Seven {sup 271}Ds decay chains were identified in the bombardment of {sup 208}Pb targets with 311.5- and 314.3-MeV {sup 64}Ni projectiles using the Berkeley Gas-filled Separator. These data, combined with previous results, provide an excitation function for this reaction. From these results, an optimum energy of 321 MeV was estimated for the production of {sup 272}111 in the reaction {sup 208}Pb({sup 65}Cu, n). One decay chain was observed, resulting in a cross section of 1.7{sub -1.4}{sup +3.9} pb. This experiment confirms the discovery of element 111 by the Darmstadt group who used the {sup 209}Bi({sup 64}Ni, n){sup 272}111 reaction.
  • The 64Ni(d,2He)64Co reaction was studied at the AGOR cyclotron of the KVI, Groningen, with the Big-Bite Spectrometer and the EuroSuperNova detector using a deuteron beam of 170 MeV. An energy resolution of about 100 keV was achieved. In addition to the ground-state with J{pi} = 1+, several other 1+ states could be identified and the strengths of the corresponding Gamow-Teller transitions determined.