High-spin states in /sup 214/Rn, /sup 216/Ra and a study of even-even N = 128 systematics

Journal Article · Fri Dec 31 23:00:00 EST 1982 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.27.180· OSTI ID:6142633

Loennroth, T; Horn, D; Baktash, C; Lister, C J; Young, G R

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), Journal Name: Phys. Rev. C; (United States) Vol. 27:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ALPHA PARTICLES
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYONS
BRANCHING RATIO
CARBON 13 REACTIONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
FERMIONS
GAMMA RADIATION
HADRONS
HEAVY ION REACTIONS
HEAVY NUCLEI
HIGH SPIN STATES
IONIZING RADIATIONS
ISOTOPES
LEAD 208 TARGET
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NANOSEC LIVING RADIOISOTOPES
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PARITY
PARTICLE PROPERTIES
RADIATIONS
RADIOISOTOPES
RADIUM 216
RADIUM ISOTOPES
RADON 214
RADON ISOTOPES
SHELL MODELS
SPIN
TARGETS