RADIOACTIVE DECAY OF Os$sup 188$ + /cap alpha/
Osmium enriched to 87.7% in the mass number 188 was irradiated by 24 Mev alpha -particles. Subsequent to an ( alpha ,n) reaction /sub 78/Pt/sup 191/ was produced, which decayed to /sub 77/Ir/sup 191/ mainly by electron capture. The Z number 77 and the A number 191 were assigned to the gamma activity of the sample by comparing the x ray emitted by it and by correlating the half life and gamma transitions observed by other investigators. The decay of the sample was followed for about four months. A common half life of 2.89 days was obtained for the 64.5, 95.8, 129.6, 176.0, 220.0, 268.4, 360.0, standard sources Ba/sup 133/, Na/sup 22/, Co/sup 57/, Co/sup 60/, Zn/sup 65/, an d Cr/sup 51/ were used to obtain spectra of the sample. Gain checks revealed that the possible shift was not over half a channel. Since the linear energy calibration was such that one channel corresponded to 4.32 kev, the values of the gamma transitions were determined correct within plus or minus 2.2 kev. The spectral shapes of 176.0, 360.0, and 539.0 kev peaks were not quite Gaussian, and it was apparent that these were composite peaks. Since the 220.0 kev peak was quite weak, it was impossible to determine by visual inspection whether it was composite or single. Unscrambling and coincidence studies revealed that these were all composite peaks. When these views were taken into consideration in all 17 gamma transitions, 64.5, 95.8, 129.6, 172.6, 178.4, 188.6, 219.7, and 626.0 kev were determined within plus or minus 2.2 kev. Unscrambliag studies revealed that the ratios of the relative intensities were as follows: 65:96:129:176:220:268:360:410:457:539:626:52.0:1.3:3.3:2.2:0.1:1.1:9.5: a2.9: 19.3:2.7. Gamma-gamma coincidence studies provided the following coincidence relations: (129 gamma )(172 gamma , 188 gamma , 219 gamma , 221 gamma , 361 gamma , 41O gamma , and 496 gamma ), (178 gamma )(172 gamma , 188 gamma , 219 gamma , and 361 gamma ), (172 gamma )(96 gamma , 129 gamma , 178 gamma , 188 gamma , and 219 gamma ), (188 gamma ) (96 gamma , 129 gamma , 172 gamma , 178 gamma , and 351 gamma ), (268 gamma )(188 gamma and 219 gamma ), (351 gamma )(188 gamma and 218 gamma ), (361 gamma )(96 gamma , 129 gamma , and 178 gamma ), and (41O gamma )(129 gamma ). The 539, 570, and 626 kev photopeaks were not found in coincidence with any other gamma. Two gamma transitions, 82.6 and 48.8 kev, are heavily internally converted. Transition probabilities were calculated by using the available conversion electron data (theoretical and experimental). Multipole orders were also assigned on the basis of the experimental data to the various gamma transitions detected. An energy level diagram was proposed which was consistent with all the coincidence measurements, transition probabilities, and multipole orders assigned to the gamma transitions of Os/sup 188/ + alpha .
- Research Organization:
- Ohio State Univ., Columbus
- NSA Number:
- NSA-16-023041
- OSTI ID:
- 4833090
- Journal Information:
- Dissertation Abstr., Vol. Vol: 22; Other Information: Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
Similar Records
STUDY OF RADIATIONS FROM HAFNIUM-172, NEODYMIUM-144, DYSPROSIUM-156, AND ERBIUM-162
RADIOACTIVE DECAY OF Os$sup 187$ +He$sup 4$ AND Os$sup 147$ +He$sup 3$