DECAY OF Er$sup 172$ AND Tm$sup 17$$sup 2$
Er/sup 1//sup 7//sup 2/ is produced by double neutron capthre in enriched Er/sup 1//sup 7//sup 0/. The beta decays of 50.4 hr Er/sup 1//sup 7// sup 2/ and its daught er, 63.7 hr Tm/sup 1//sup 7//sup 2/ are studied with a solenoidal beta spectrometer and with beta and gamma scintillation spectrometers. The highest energy group of the Tm/sup 1//sup 7//sup 2/ beta spectrum has an end point energy of 1.83 Mev; this group represents the Tm/sup 1//sup 7//sup 2/ yields Yb/sup 1//sup 7//sup 2/ ground-state beta transition. The beta decay of Tm/sup 1//sup 7//sup 2/ is accompanied by gamma rays of the following energies: 0.079, 0.180, 0.422, 0.495, 0.915, 1.095, 1.29, Tm/sup 1//sup 7//sup 2/ is proposed with excited states in Yb/sup 1//sup 7//sup 2/ at 0.07 cay of Er/sup 1// sup 7//sup 2/ is accompanied by gamma rays of the following energies: 0.050 (Tm K x ray), 0.108, 0.126, 0.408, and 0.610 Mev, the last of which represents a transition to the Tm/sup 1//sup 7//sup 2/ ground state. The beta spectrum measured in coincidence with the 0.610-Mev gamma ray has an end-point energy of - 0.26 Mev, which establishes a decay energy of 0.87 Mev for Er/sup 1//sup 7//sup 2/ . (auth) l8805 Hyperfine structhre in the /sup 4/S3/2, ground state of the radioactive atom As/sup 7//sup 6/ is investigated by the method of magnetic resonance in an atomic beam produced by microwave discharge dissociation of arsenic vapor. DELTA F = o resonances are observed within both the F = 5/2 and F = 7/2 atomic levels at several values of magnetic field up to about 5 gauss, indicating that the spin of the As/sup 7//sup 6/ nucleus is 2. An analysis of multiple quantum transition spectra within the same F states gives a measurement for two of the hfs intervals: DELTA nu 7/2,/sub 5//sub ///sub 2/ = plus or minus (117 plus or minus 4) Mc and DELTA nu /sub 5/2/,/sub 3/2/ = plus or minus (69 plus or minus 16) Mc, with the same sign for both. From the value of the hfs constant A, the magnitude of the magnetic field at the arsenic nucleus is (1.33 plus or minus 0.15) x lO/sup 5/ gauss in reasonable agreement with the variation in this field among similar atoms. The value of g/sub j/ is found to be 1.994 plus or minus 0.003 for arsenic. (auth)
- Research Organization:
- Los Alamos Scientific Lab., N. Mex.
- NSA Number:
- NSA-15-018804
- OSTI ID:
- 4012262
- 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- Physical Review (U.S.) Superseded in part by Phys.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, Vol. Vol: 122; Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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