Production of New Isomeric Nuclear States by Photonuclear Reactions on Antimony and Thallium (in German)
The systematic search for new short-lived isomeric states was continued by irradiation of an additional 32 selected elements with 26 Mev bremsstrahlung. Isomeric transitions were detected using a conventional scintillation spectrometer. Irradiation of antimony led to the production of a new (530 plus or minus 50) mu sec isomeric state which decays through emission of partially converted (62 plus or minus 2) kev and (76 plus or minus 3) kev gamma rays. The 530 mu sec half life is tentatively associated with the 136 kev level in Sb122. An apparent inconsistency in the previously proposed level scheme of Sb122 can be removed if the 3.5 min Sb122 activity is assigned an isomeric level in Sb122 lying less than 15 kev above the 136 kev isomeric state. A new measurement of the half-life of this level yielded a value of (4.1 plus or minus 0.2) min. Another new isomeric state with a (2.1 plus or minus 0.2) msec half life was produced by irradiating thallium. The isomeric state decays by emission of two gamma rays of (335 plus or minus 8) kev and (597 plus or minus 12) kev which were found to be in coincidence. Irradiation of erbium led to the production of a short-lived isomeric transition which may be identical with a previously reported Ho isomer. Results are discussed in the appendix.
- Research Organization:
- Universitat, Heidelberg
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-16-033909
- OSTI ID:
- 4800158
- Journal Information:
- Z. Physik, Journal Name: Z. Physik Vol. Vol: 168
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
Similar Records
DECAY OF THE 1.26-MIN ISOMERIC LEVEL IN Dy$sup 16$$sup 5$
HALF-LIVES OF SOME NUCLEAR STATES IN THE MILLIMICROSECOND REGION