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Title: Measurements of fusion reactions induced by radioactive 132Sn on 64Ni

Abstract

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.

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [3];  [4];  [5];  [1];  [1];  [6];  [2];  [7];  [8];  [1];  [8];  [1];  [1]
  1. ORNL
  2. University of Notre Dame, IN
  3. Gonzaga University
  4. State University of New York, Oswego
  5. {nmn} [ORNL
  6. Rutgers University
  7. University of Tennessee, Knoxville (UTK)
  8. 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:
1018297
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: European Physical Journal, The - Special Topics; Journal Volume: 150; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CROSS SECTIONS; EVAPORATION; EXCITATION; FISSION; NEUTRON TRANSFER; PROJECTILES; RESIDUES; STATISTICAL MODELS; NICKEL 64; TIN 132; Reactions induced by unstable nuclei; Fusion reactions

Citation Formats

Liang, J Felix, Shapira, Dan, Gross, Carl J, Varner Jr, Robert L, Amro, H, Beene, James R, Bierman, Jeff D, Caraley, Anne L, Galindo-Uribarri, Alfredo, Gomez Del Campo, Jorge, Hausladen, Paul, Jones, K. L., Kolata, Jim J, Larochelle, Y, Loveland, Walter, Mueller, Paul Edward, Peterson, Don, Radford, David C, and Stracener, Daniel W. Measurements of fusion reactions induced by radioactive 132Sn on 64Ni. United States: N. p., 2007. Web. doi:10.1140/epjst/e2007-00259-7.
Liang, J Felix, Shapira, Dan, Gross, Carl J, Varner Jr, Robert L, Amro, H, Beene, James R, Bierman, Jeff D, Caraley, Anne L, Galindo-Uribarri, Alfredo, Gomez Del Campo, Jorge, Hausladen, Paul, Jones, K. L., Kolata, Jim J, Larochelle, Y, Loveland, Walter, Mueller, Paul Edward, Peterson, Don, Radford, David C, & Stracener, Daniel W. Measurements of fusion reactions induced by radioactive 132Sn on 64Ni. United States. doi:10.1140/epjst/e2007-00259-7.
Liang, J Felix, Shapira, Dan, Gross, Carl J, Varner Jr, Robert L, Amro, H, Beene, James R, Bierman, Jeff D, Caraley, Anne L, Galindo-Uribarri, Alfredo, Gomez Del Campo, Jorge, Hausladen, Paul, Jones, K. L., Kolata, Jim J, Larochelle, Y, Loveland, Walter, Mueller, Paul Edward, Peterson, Don, Radford, David C, and Stracener, Daniel W. Mon . "Measurements of fusion reactions induced by radioactive 132Sn on 64Ni". United States. doi:10.1140/epjst/e2007-00259-7.
@article{osti_1018297,
title = {Measurements of fusion reactions induced by radioactive 132Sn on 64Ni},
author = {Liang, J Felix and Shapira, Dan and Gross, Carl J and Varner Jr, Robert L and Amro, H and Beene, James R and Bierman, Jeff D and Caraley, Anne L and Galindo-Uribarri, Alfredo and Gomez Del Campo, Jorge and Hausladen, Paul and Jones, K. L. and Kolata, Jim J and Larochelle, Y and Loveland, Walter and Mueller, Paul Edward and Peterson, Don and Radford, David C and Stracener, Daniel W},
abstractNote = {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.},
doi = {10.1140/epjst/e2007-00259-7},
journal = {European Physical Journal, The - Special Topics},
number = 1,
volume = 150,
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 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.
  • 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
  • Gamma-ray transitions inmore » $$^{134}$$\textrm{Te}, $$^{135}$$\textrm{Te}, and $$^{136}$$\textrm{Te} were measured from $$^{9}$$\textrm{Be} induced reactions with a radioactive $$^{132}$$\textrm{Sn} beam at a sub-Coulomb barrier energy of $3$~MeV per nucleon using particle-$$\gamma$$ coincidence spectroscopy. The transitions were selected by gating on alpha-like particles in a \textrm{CsI} detector following a combination of ($$^{9}$$\textrm{Be},$$\alpha 1n$$), ($$^{9}$$\textrm{Be},$$\alpha 2n$$), and ($$^{9}$$\textrm{Be},$$\alpha 3n$$) reactions. Distorted wave Born approximation calculations suggest little to no contribution from the ($$^{9}$$\textrm{Be},$$^{7}$$\textrm{He}), ($$^{9}$$\textrm{Be},$$^{6}$$\textrm{He}), and ($$^{9}$$\textrm{Be},$$^{5}$$\textrm{He}) direct reactions. Gamma-ray transitions from previously known $$2^+\otimes \nu\, 2f_{7/2}$$ and $$4^+\otimes \nu\, 2f_{7/2}$$ multiplet members in $$^{135}$$\textrm{Te} are observed. A new $$\gamma$$-ray is observed, assigned to the third excited state in $$^{135}$$\textrm{Te}, and new $$2^+\otimes \nu\, 2f_{7/2}$$ multiplet members are suggested. In addition, spin assignments are made using recent one-neutron transfer data. The updated experimental data for $$^{135}$$\textrm{Te} are compared to shell-model calculations for a relatively complete set of states up to the yrast $$15/2^-, 4^+\otimes \nu\, 2f_{7/2}$$ multiplet member at 1505 keV.« less
  • 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.
  • Evaporation residue cross sections formore » $$^{124,126,127,128}$$Sn+$$^{64}$$Ni and $$^{132}$$Sn+$$^{58}$$Ni have been measured to study the effects of neutron excess in neutron-rich radioactive nuclei on fusion. For the reactions with $$^{64}$$Ni, the fusion probability does not decrease with increasing neutron excess in Sn, contrary to the result of the stable beam Sn+Zr measurement. A comparison of the reduced evaporation residue cross sections for $$^{126}$$Sn+$$^{64}$$Ni and $$^{132}$$Sn+$$^{58}$$Ni, which make the same compound nucleus, shows that the fusion probability is indistinguishable for reactions involving the same atomic elements but different isotope combinations.« less