NEW 20-HOUR ELECTRON-CAPTURING RHENIUM ISOTOPE, Re$sup 18$$sup 1$

Journal Article · Tue Oct 01 04:00:00 EDT 1957 · Physical Review (U.S.) Superseded in part by Phys.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.108.108· OSTI ID:4348630

Gallagher, Jr, C J; Sweeney, M; Rasmussen, J O

A new 20 plus or minus 2 hour electron-capturing rhenium isotope has been investigated. A mass assignment to Re/sup 181/ is made from the energy threshold for its production by alpha-particle bombardment of Ta/sup 181/ and by the chemical separation and identification of its radioactive daughter, W/sup 181/ . A very prominent 365.5-kev transition is observed in the gamma-ray and electron spectra. It is deduced from the 365.5-kev gamma to K x-ray intensity ratio that more than 80% of the electron capture populates the level at 365.5 plus or minus 0.2 kev above the ground state. This level apparently decays directly to ground by a delayed M2 transition, and is believed to be the same l4- microsccond isomer observed by others from a ( gamma ,n) reaction on W/sup 182/. A possible interpretation of the 365.5-kev transition in terms of the odd-neutron states of a spheroidal well is given. (auth)

• Research Organization: Univ. of California, Berkeley
• NSA Number: NSA-12-001724
• OSTI ID: 4348630
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 108; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA BEAMS
CAPTURE
DECAY
ELECTRONS
ENERGY LEVELS
GAMMA RADIATION
HALF-LIFE
IRRADIATION
MASS
MEASURED VALUES
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
PHYSICS
QUALITATIVE ANALYSIS
RHENIUM 181
SPECTRA
TANTALUM 181
TUNGSTEN 181
TUNGSTEN 182
X RADIATION