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DECAY OF Si$sup 2$$sup 6$

Technical Report ·
OSTI ID:4171644
;

A 2.1 plus or minus 0.3-sec activity was observed when vacuum distilled magnesium was bombarded with 8-Mev He/sup 3/ ions. Half-life studies using Nal(Tl) scintillation counters yielded evidence that this activity was due to the decay of a positron emitting isotope with a maximum kinetic energy greater than 3.5 Mev. The features of gamma-ray spectrum with the exception of a weak line at 824 plus or minus 15 kev could be understood in terms the decay characteristics of known radioisotopes. An internally consistent argument based on the known decay characteristics of reaction products that may be expected from energy considerations; the results of half-life studies; experimental gamma spectra; and nuclear systematics, can be made to support the conclusion that the 2.1 plus or minus 0.3-sec half-life is that of Si/sup 26/ produced in the reaction Mg/sup 24/(He/sup 3/,n)Si/sup 26/, and a consistent decay scheme can be proposed. The ground state of Si/sup 26/(0+) decays by the emission of two positron groups to excited states of Al/sup 26/. The most intense transition, E/ sub 0/ = 3.76 Mev, is to the 0.228Mev state (0i) of Al/sup 26/. The second transition, E/sub 0/ = 2.94 Mev, is to the 1.05-Mev state (1+) of Al/sup 26/. The 1.05-Mev and 0.228-Mev state are then connected by a 824 plus or minus 15- kev gamma transition. The energies of the positron transitions are derived from the known levels of Al/sup 26/ and the Si/sup 26/-Al/sup 26/ mass differences. (auth)

Research Organization:
Purdue Univ., Lafayette, Ind.
NSA Number:
NSA-14-012209
OSTI ID:
4171644
Report Number(s):
TID-5732
Country of Publication:
United States
Language:
English

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Related Subjects

ALUMINUM 26
BETA DECAY
BRANCHING RATIO
DECAY
DISTILLATION
EMISSION
ENERGY
ENERGY LEVELS
ENERGY RANGE
GAMMA RADIATION
HALF-LIFE
HELIUM 3
ION BEAMS
ISOTOPES
MAGNESIUM
MAGNESIUM 24
MASS
MEASURED VALUES
NEUTRONS
NUCLEAR REACTIONS
PARITY
PHYSICS
POSITRONS
RADIOACTIVITY
RADIOISOTOPES
SCINTILLATION COUNTERS
SILICON 26
SODIUM IODIDES
SPECTRA
SPIN
THALLIUM
VACUUM