Fusion-fission in the /sup 16/O + /sup 40,44/Ca and /sup 32/S + /sup 24/Mg reactions

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In measurements of fully-damped yields for the /sup 16/O + /sup 40,44Ca and /sup 32/S + /sup 24/Mg reactions, evidence for a fusion-fission reaction mechanism were found. The experiments were performed at the Argonne tandem-linac booster facility. Reaction products with masses 22 < A < 36 for the /sup 16/O + /sup 40,44Ca reactions and 10 < A < 28 for the /sup 32/S + /sup 24/Mg reaction were detected and identified using the time-of-flight technique. The /sup 16/O + /sup 40,44Ca reactions were measured at several center-of-mass energies from 49.5 to 62.5 MeV, while the /sup 32/S + /sup ... continued below

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Pages: 12

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Sanders, S.J.; Back, B.B.; Betts, R.R.; Dichter, B.K.; Kaufman, S.; Kovar, D.G. et al. March 1, 1986.

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In measurements of fully-damped yields for the /sup 16/O + /sup 40,44Ca and /sup 32/S + /sup 24/Mg reactions, evidence for a fusion-fission reaction mechanism were found. The experiments were performed at the Argonne tandem-linac booster facility. Reaction products with masses 22 < A < 36 for the /sup 16/O + /sup 40,44Ca reactions and 10 < A < 28 for the /sup 32/S + /sup 24/Mg reaction were detected and identified using the time-of-flight technique. The /sup 16/O + /sup 40,44Ca reactions were measured at several center-of-mass energies from 49.5 to 62.5 MeV, while the /sup 32/S + /sup 24/Mg data were obtained at a single energy of E/sub cm/ = 60 MeV. The resulting total kinetic energies (calculated assuming two-body kinematics), angular distributions, and mass distributions of the fragments are found to be consistent with a fusion-fission reaction mechanism. An alternative explanation of the yields in terms of a deep-inelastic scattering mechanism is ruled out by the asymmetric nature of the mass distributions: the maximum cross section for the /sup 32/S + /sup 224/Mg reaction is detected in the mass 12 channel whereas the maximum cross sections for deep-inelastic scattering would be expected to occur near the target-projectile mass partition. For the /sup 32/S + /sup 4/Mg reaction at E/sub cm/ = 60 MeV, the fission cross sections is found to be approximately 6% of the evaporation-residue cross section. These results indicate that at higher energies fission competes with light particle evaporation in compound nuclear decay - even in these light systems. 8 refs.

Physical Description

Pages: 12

Notes

NTIS, PC A02/MF A01.

Source

  • Symposium on the many facets of heavy ion fusion reactions, Argonne, IL, USA, 24 Mar 1986

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  • Other: DE86014611
  • Report No.: CONF-860396-11
  • Grant Number: W-31-109-ENG-38
  • DOI: 10.2172/5273111 | External Link
  • Office of Scientific & Technical Information Report Number: 5273111
  • Archival Resource Key: ark:/67531/metadc1070371

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  • March 1, 1986

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  • Feb. 4, 2018, 10:51 a.m.

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  • April 18, 2018, 6:57 p.m.

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Sanders, S.J.; Back, B.B.; Betts, R.R.; Dichter, B.K.; Kaufman, S.; Kovar, D.G. et al. Fusion-fission in the /sup 16/O + /sup 40,44/Ca and /sup 32/S + /sup 24/Mg reactions, report, March 1, 1986; Illinois. (digital.library.unt.edu/ark:/67531/metadc1070371/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.