Radiochemical studies of neutron deficient actinide isotopes [electronic resource].
- Published:
- Berkeley, Calif. : University of California, Berkeley, 1978.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description:
- Pages: 99 : digital, PDF file
- Additional Creators:
- University of California, Berkeley and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Summary:
- The production of neutron deficient actinide isotopes in heavy ion reactions was studied using alpha, gamma, x-ray, and spontaneous fission detection systems. A new isotope of berkelium, /sup 242/Bk, was produced with a cross-section of approximately 10 ..mu..b in reactions of boron on uranium and nitrogen on thorium. It decays by electron capture with a half-life of 7.0 +- 1.3 minutes. The alpha-branching ratio for this isotope is less than 1% and the spontaneous fission ratio is less than 0.03%. Studies of (Heavy Ion, pxn) and (Heavy Ion, ..cap alpha..xn) transfer reactions in comparison with (Heavy ion, xn) compound nucleus reactions revealed transfer reaction cross-sections equal to or greater than the compound nucleus yields. The data show that in some cases the yield of an isotope produced via a (H.I.,pxn) or (H.I.,..cap alpha..xn) reaction may be higher than its production via an xn compound nucleus reaction. These results have dire consequences for proponents of the ''Z/sub 1/ + Z/sub 2/ = Z/sub 1+2/'' philosophy. It is no longer acceptable to assume that (H.I.,pxn) and (H.I.,..cap alpha..xn) product yields are of no consequence when studying compound nucleus reactions. No evidence for spontaneous fission decay of /sup 228/Pu, /sup 230/Pu, /sup 232/Cm, or /sup 238/Cf was observed indicating that strictly empirical extrapolations of spontaneous fission half-life data is inadequate for predictions of half-lives for unknown neutron deficient actinide isotopes.
- Report Numbers:
- E 1.99:lbl-7714
lbl-7714 - Subject(s):
- Other Subject(s):
- Berkelium 242
- Isotope Production
- Neutron-Deficient Isotopes
- Radiochemical Analysis
- Actinide Isotopes
- Alpha Detection
- Cross Sections
- Gamma Detection
- Half-Life
- Heavy Ion Reactions
- Spontaneous Fission
- X-Ray Detection
- Actinide Nuclei
- Berkelium Isotopes
- Beta Decay Radioisotopes
- Charged Particle Detection
- Charged-Particle Reactions
- Chemical Analysis
- Decay
- Detection
- Electron Capture Radioisotopes
- Fission
- Heavy Nuclei
- Isotopes
- Minutes Living Radioisotopes
- Nuclear Reactions
- Nuclei
- Odd-Odd Nuclei
- Radiation Detection
- Radioisotopes
- Note:
- Published through SciTech Connect.
04/01/1978.
"lbl-7714"
Williams, K.E. - Funding Information:
- W-7405-ENG-48
View MARC record | catkey: 14761461