High-spin states in /sup 214/Rn, /sup 216/Ra and a study of even-even N = 128 systematics
High-spin states in /sup 214/Rn and /sup 216/Ra have been studied by means of the reaction /sup 208/Pb(/sup 13/C, ..cap alpha.. 3n ..gamma..)/sup 214/Rn and /sup 208/Pb(/sup 13/C, 5n ..gamma..)/sup 216/Ra at beam energies in the range 75--95 MeV. In-beam spectroscopy techniques, including ..gamma..-decay excitation functions, ..cap alpha..-..gamma.. coincidences, ..gamma..-..gamma.. coincidences, ..gamma..-ray angular distributions, and pulsed-beam-..gamma.. timing, were utilized to establish level energies, ..gamma..-ray multipolarities, J/sup ..pi../ assignments, and isomeric lifetimes. Excited states with spins up to 23h in /sup 214/Rn and roughly-equal30h in /sup 216/Ra were observed. Isomers were found in /sup 214/Rn at 1625 keV (T/sub 1/2/ = 9 ns, J/sup ..pi../ = 8/sup +/), 1787 keV (22 ns, 10/sup +/), 3485 keV (95 ns, 16), 4509 keV (230 ns, 20), and 4738 keV (8 ns, 22), and in /sup 216/Ra at 1708 keV (8 ns, 8/sup +/) and 5868 keV (10 ns, approx.24). B(EL) values were deduced and compared to previously known lead-region electric transition rates. Shell-model calculations were performed and used to make configurational assignments. The absence of major ..cap alpha..-decay branching in the isomers is explained and the systematic behavior of N = 128 even-even nuclei is discussed.
- Research Organization:
- Brookhaven National Laboratory, Upton, New York 11973
- OSTI ID:
- 6142633
- Journal Information:
- Phys. Rev. C; (United States), Vol. 27:1
- Country of Publication:
- United States
- Language:
- English
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RADIUM 216
HIGH SPIN STATES
RADON 214
ALPHA PARTICLES
ANGULAR DISTRIBUTION
BRANCHING RATIO
CARBON 13 REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
GAMMA RADIATION
LEAD 208 TARGET
MEV RANGE 10-100
NEUTRONS
PARITY
SHELL MODELS
SPIN
ALKALINE EARTH ISOTOPES
ANGULAR MOMENTUM
BARYONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
FERMIONS
HADRONS
HEAVY ION REACTIONS
HEAVY NUCLEI
IONIZING RADIATIONS
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
NANOSEC LIVING RADIOISOTOPES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PARTICLE PROPERTIES
RADIATIONS
RADIOISOTOPES
RADIUM ISOTOPES
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651923* - Nuclear Properties & Reactions
A=190-219
Experimental- Energy Levels & Transitions- (-1987)
651925 - Nuclear Properties & Reactions
A=190-219
Experimental- Nuclear Reactions & Scattering- (-1987)