DECAY OF Ta$sup 177$ AND Lu$sup 177$ TO LEVELS IN Hf$sup 17$$sup 7$
The decays of Ta/sup 177/ and Lu/sup 177/ to levels in vestigated with beta spectrometers, NaI(Tl) gamma spectrometers, and fast coincidence and angular correlation techniques. Energy levels in Hf/sup 177/ were characterized according to their energy (kev), the Nilsson asymptotic quantum numbers (Nn/sub 2/ LAMBDA ), the total angular momentum and its component along the symmetry axis (I,K), and the parity ( pi ) as follows: 0STA5I4 7/2, 7/2-!; 112.97STA514 9/2, 7/ 2-!; 249.7STA5I4 11/2, 7/1-!; 32l.34STA624 9/2, 9/2+1; 447.9STA624 11/2, 585.8STA642 7/2, 3/2+1; 509.0STA5I2 5/2, 5/1-1; 605.5STA512 7/2, 5/2-!; 746.04STA633 7/2, 7/2+1; 848.2STA 633 9/2, 7/2+1; and 1058.38STA503 7/2, 7/2-!. The levels at 447.9, 488.8, and 585.8 kev are tentative. The spins and parities were uniquely determined by angular correlation and internal conversion data for the levels at 746.0 and 848.2 kev, asof the levels at 0, 113.0 249.7, and 321.3 kev are correct as determined from earlier work. For the level at 1058.4 kev the ft value is needed in addition to angular correlation and conversion data in order to determine the spin and parity uniquely. The spins of Lu/sup 177/ and Hf/ sup 177/ were previously measured directly as 7/2, and the Ta/sup 177/ spin is expected to be 7/2 on the basis of other tantalum isotopes. The following half- lives were measured: 56.56 hr for Ta/sup 177/ 0.32 nsec for the level at 113.0 kev, and 0.52 nsec for the level at 32l.3 kev. The K/L electron capture ratio to the 1058.4-kev level and the beta +/K-capture ratio to the ground state determine the total decay energy to be 1166 plus or minus 6 kev. (auth)
- Research Organization:
- Univ. of California, Livermore
- NSA Number:
- NSA-16-003728
- OSTI ID:
- 4816076
- Report Number(s):
- UCRL-6263; 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- Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 124; ISSN PHRVA
- Country of Publication:
- United States
- Language:
- English
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