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NUCLEAR STUDIES IN THE RARE EARTH REGION (thesis)

Technical Report ·
OSTI ID:4312404
S>Alpha particles from the Berkeley 50-in. cyclotron have been used to bombard rare earth oxides in an effort to study the neutron-deficient isotopes in the rare earth region. New isotopes have been discovered and their mass numbers determined. These include two new alpha emitters,Dy/sup 153/ (5 hr) and Dy/sup 154/ (13 hr), and two new electron-capture isotopes, Dy/sup 155/ (10 hr) and Ho/ sup 159/ (33 min). Two other alpha emitters, Dy/sup 152/ (2.5 hr) and Tb/sup 151/ (19 hr), have been assigned mass numbers. In addition, nuclear spectroscopic studies have been made on the gamma rays emitted following the decay of a number of isotopes in the same region of the periodic chart. Of these isotopes Tb/sup 151/, Tb/sup 153/ Tb/sup 154/, Dy/sup 155/, and Ho/sup 160/ are discussed in detail. Decay schemes have been proposed for Tb/sup 153/,Dy/sup 155/, and Ho/sup 160/. The energies of the gamma rays were determined by use of permanent-magnet spectrographs to measure the energies of the conversion electrons resulting from these gamma rays. Gamma-ray spectra have been obtained for a large number of nuclides by the use of a scintillation counter in connection with a 100-channel gamma annlyzer. Evidence is also presented for the discovery of another isotope, Dy/sup 149/ (8 min), which was produced by a nitrogen-ion bombardment on praseodymium. The isotope decays either by the emission of positrons or by electron capture or by both modes of decay. Rare earth aIpha systematics have been brought up-to-date. New partial alpha half lives have bcen calculated and are presented together with other new data available on rare earth alpha emitters. Alpha-decay energies have been plotted versus neutron number. This plot has been used togetber with known beta-decay energies in closed energy cycles to predict decay energies that are unknown experimentally. Partial alpha half lives have been plotted versus alpha-decay energies. Trends have been noticed in connection with this particular plot and possible explanations for these trends have been offered. (auth)
Research Organization:
California Univ., Berkeley, CA (US). Radiation Lab.
DOE Contract Number:
W-7405-ENG-48
NSA Number:
NSA-12-015983
OSTI ID:
4312404
Report Number(s):
UCRL-8192
Country of Publication:
United States
Language:
English

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Related Subjects

ALPHA DECAY
ALPHA PARTICLES
BETA DECAY
CYCLOTRONS
DYSPROSIUM 149
DYSPROSIUM 152
DYSPROSIUM 153
DYSPROSIUM 154
DYSPROSIUM 155
ELECTRONS
EMISSION
ENERGY LEVELS
ENERGY RANGE
GAMMA RADIATION
GAMMA SPECTROMETERS
HALF- LIFE
HOLMIUM 159
HOLMIUM 160
INTERNAL CONVERSION
IRRADIATION
ISOTOPES
MASS NUMBER
MEASURED VALUES
NITROGEN
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUMERICALS
OXIDES
PHYSICS
POSITRONS
PRASEODYMIUM
RARE EARTHS
SCINTILLATION COUNTERS
SPECTRA
SPECTROSCOPY
TERBIUM 151
TERBIUM 153
TERBIUM 154