Fusion enhancement with neutron-rich radioactive beams Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9k41zh042

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Fusion reactions with radioactive neutron-rich projectiles have been the subject of much recent theoretical and experimental interest. Predictions of enhancement of the cross section due to the use of a neutron-rich projectile may have implications for synthesis of heavy nuclei. In this work, the fusion-fission excitation functions were measured for the [superscript 32,38]S + ¹⁸¹Ta reactions. The radioactive ³⁸S beam was produced by projectile fragmentation. In the ³²S-induced reaction, an incomplete fusion component was observed at high energies, with average momentum transfer corresponding to escape of an alpha particle. Angular distribution data were used to estimate the quasifission component of the stable-beam reaction. The excitation functions were analyzed using classical and coupled-channels methods; the deduced interaction barriers were 130.7 ± 0.3 MeV and 124.8 ± 0.3 MeV for the ³²S- and ³⁸S-induced reactions, respectively. No evidence of any additional mechanism beyond a simple shift in the Coulomb barrier was observed. Taking into account the difference in reaction Q-values, the net lowering of the compound nucleus excitation energy at the barrier is about 12 MeV due to the use of the radioactive neutron-rich projectile; this could significantly affect survival probabilities of heavy nuclei.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale, 24-bit Color) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Made available in DSpace on 2012-09-05T19:34:49Z (GMT). No. of bitstreams: 1 ZyromskiKristianaE2000.pdf: 6653729 bytes, checksum: 83325567116fb8be23b4547063d92aa4 (MD5) Previous issue date: 1999-09-07
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-08-29T20:34:30Z (GMT) No. of bitstreams: 1 ZyromskiKristianaE2000.pdf: 6653729 bytes, checksum: 83325567116fb8be23b4547063d92aa4 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-05T19:34:49Z (GMT) No. of bitstreams: 1 ZyromskiKristianaE2000.pdf: 6653729 bytes, checksum: 83325567116fb8be23b4547063d92aa4 (MD5)
  • description.provenance : Submitted by John Valentino (valentjo@onid.orst.edu) on 2012-08-28T17:28:16Z No. of bitstreams: 1 ZyromskiKristianaE2000.pdf: 6653729 bytes, checksum: 83325567116fb8be23b4547063d92aa4 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items