DECAY OF Pm$sup 149$ (53 hr)
BS>The radioactive sources were obtained from neodymium oxide, enriched in Nd/sup 148/, irradiated in the Angonne reactor CP-5. After the 1.8-hr activity of Nd/sup 149/ decayed away, the 53-hr activity of /sub 61/Pm/sup 149/ remained. Some of the samples were punified by ion-exchange-column techniques before being studied. The radiations were investigated with a 180 deg focusing beta -ray spectrometer and the Argonne 256-channel scintillation coincidence spectrometer. The magnetic spectrometer resolved two components of the beta spectrum at 1.064 plus or minus 0.008 and 0.784 plus or minus 0.010 Mev. The beta rays were also studied by coincidence absorption techniques. In addition to the branch with a maximum energy of 0.784 plus or minus 0.010 Mev, this method revealed two more at 0.47 plus or minus 0.04 and 0.19 plus or minus 0.04 Mev. The scintillation pulse-height spectrum of the gamma rays revealed the presence of three transitions at 0.850 plus or minus 0.008, 0.582 plus or minus 0.006, and 0.285 plus or minus 0.001 Mev. A fourth gamma ray with an energy of 0.548 plus or minus 0.006 Mev was found in coincidence measurements. These radiations were fitted into a decay scheme comprising the ground state and four excited states in Sm/sup 149/ at 0.285, 0.582, 0.833, and 0.850 Mev. The log-ft values, transition intensities, and possible spin and parity assignments are discussed. (auth)
- Research Organization:
- Argonne National Lab., Ill.
- NSA Number:
- NSA-15-000947
- OSTI ID:
- 4122978
- 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- Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 120; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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