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ISOMERIC STATE OF Po$sup 21$$sup 2$

Journal Article · · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
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An isomer of Po/sup 212/ with a half life of (45.1 plus or minus 0.6) sec and an excitation energy of 2.93 Mev has been positively identified by chendical and nuclear spectroscopic techniques. The isomer decays to known states of Pb/sup 208/ by the emission of alpha particles with energies and intensities of (11.65 plus or minus 0.02) Mev--97%, (9.08 plus or minus 0.015) Mev--(1.00 plus or minus 0.04)% and (8.52 plus or minus 0.015) Mev-- (2.05 plus or minus 0.09)% In coincidence with Po/sup 212m/ alpha particles, gamma rays with energies and intensities of (2.61 plus or minus 0.02) Mev--(2.6 plus or minus 0.3)% and (0.67 plus or minus 0.015) Mev-- ~ 2% were found. An immense alpha-decay hindrance factor for the 11.65-Mev group of 4 x 10/sup 13/ is explained by spin and parity assignments of 18+ for Po/sup 212m/= in conjunction with a theoretical shell-model analysis made by Glendenning. The alpha-particle energies and intensities of previously known alpha groups of Po/sup 211m/ STA(25.5 plus or minus 0.3) sec! were measured yielding values of (8.87 plus or minus 0.01) Mev--(7.04 plus or minus 0.015) Mev--91%. A new alpha group was found with an energy and intensity of (8.30 plus or minus 0.015) Mev--(0.25 plus or minus 0.02)%. In coincidence with Po/sup 211m/ = alpha particles was a gamma ray of (O.90 plus or minus 0.015) Mev--(1.65 plus or minus 0.11)%. These Po/sup 211m/ = radiations are all consistent with the known energy level scheme of Pb/sup 207/. (auth)

Research Organization:
Univ. of California, Berkeley
NSA Number:
NSA-16-029835
OSTI ID:
4800381
Report Number(s):
UCRL-10094; 0031-899X
Journal Information:
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 127; ISSN PHRVA
Country of Publication:
United States
Language:
English

References (6)

Note on an Isomeric State of Po 212 journal August 1962
Alpha-Emitting Isomer Polonium 211 journal October 1954
Spins and Parities of Energy Levels inPb208 journal January 1954
Calculation ofα-Transition Probabilities journal August 1960
Table of Isotopes journal April 1958
Nuclear Physics B. Nuclear Dynamics, Theoretical journal April 1937

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Related Subjects

ALPHA DECAY
ALPHA PARTICLES
DECAY
ENERGY
ENERGY LEVELS
EXCITATION
HALF-LIFE
ISOMERS
LEAD 208
NUCLEAR MODELS
PARITY
PHYSICS
POLONIUM 212
SHELL MODELS
SPECTROSCOPY
SPIN