Neutron Deficient Isotopes of Rhodium andPalladium
Journal Article
·
· Physical Review
OSTI ID:971429
A 9-hour palladium activity assigned to mass 101 and 4.0 day activity assigned to mass 100 have been identified. As a part of an investigation being carried out on the nuclear reactions resulting from the irradiation of antimony with high energy particles (200 Mev deuterons) it became of interest to examine the products some 20 mass units below the target nucleus, that is, around mass number 100. This region covers heavy isotopes of Mo and Tc, stable isotopes of Ru and light isotopes of Rh and Pd. It was not possible to isolate chemically the rhodium fraction from the complex mixture of reaction products but the palladium fraction could be purified in good yield. The decay curve was too complex to resolve accurately as it proved to consist of at least six different palladium activities and a similar number of daughter activities growing in with a considerable spread of half-lives. By periodically isolating from the palladium the silver and rhodium daughters a considerably better picture ofo the species present could be obtained. For example, silver fractions removed at intervals proved the presence of palladium {beta}{sup -} - emitters as part of the following isobar pairs: 13 hr Pd{sup 109} - 40 sec Ag{sup 109}, 26 min Pd{sup 111} - 7.5 d Ag{sup 111}, 21 hr Pd{sup 112} - 3.2 hr Ag{sup 112}. In similar manner the presence of two new neutron deficient isotopes of palladium was deduced by removing rhodium daughters periodically. The rhodium so obtained could be resolved into half-life periods suggestive of two activities reported by Sullivan, Sleight and Gladrow as 21-hr Rh{sup 100} and 5.9-day Rh{sup 101}. These activities were formed from palladium at rates corresponding to half-lives of {approx}4 days for the parent of Rh{sup 100} and {approx} 10 hours for the parent of Rh{sup 101}.
- Research Organization:
- Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
- Sponsoring Organization:
- Physics Division
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 971429
- Report Number(s):
- UCRL-48
- Journal Information:
- Physical Review, Journal Name: Physical Review
- Country of Publication:
- United States
- Language:
- English
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