NEPTUNIUM ISOTOPES: 234, 235, 236

Journal Article · Sat Feb 15 04:00:00 EST 1958 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.109.1263· OSTI ID:4331078

Gindler, J E; Huizenga, J R; Engelkemeir, D W

Neptunium isotopes of mass numbers 234, 235, and 236 were produced by an 18-Mev deuteron bombardment of uranium highly enriched in U/sup 235/. The radiations of Np/sup 235/ were studied with scintillation and proportional counters in singles and coincidence. The L/K and M/L electron capture branching ratios of Np/sup 235/ were measured to be 36.7 and 0.46, respectively. From the L/K ratio, the calculated decay energy of Np/sup 235/ is 123 kev. An upper limit of 2.1% of the Np/sup 235/ electron capture disintegrations populate excited states of U/sup 235/. The experimental data favor a spin of 5/2 for Np/sup 235/. The alpha to electron capture ratio for Np/sup 235/ is 1.59 x 10/sup -5/, giving a partial alpha halflife of 7.0 x 10/sup 4/ years. The long-lived isomer of Np/ sup 236/ was produced in the bombardment, but no isomer of Np/sup 234/ with half-life longer than two months was observed in a mass spectrometer analysis of the neptunium sample. (auth)

• Research Organization: Argonne National Lab., Lemont, Ill.
• NSA Number: NSA-12-006543
• OSTI ID: 4331078
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 109; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA DECAY
CAPTURE
CHEMISTRY
COUNTERS
DECAY
DECOMPOSITION
DEUTERON BEAMS
ELECTRONS
ENERGY
ENERGY LEVELS
ENRICHMENT
EXCITATION
HALF-LIFE
ISOMERS
MASS SPECTROMETERS
MATHEMATICS
NEPTUNIUM 234
NEPTUNIUM 235
NEPTUNIUM 236
PRODUCTION
QUANTITY RATIO
RADIATIONS
SCINTILLATION COUNTERS
SPIN
URANIUM
URANIUM 235