| Autor: |
R.J. Gehrke, R.A. Anderl, R.C. Greenwood, R.G. Helmer, C. W. Reich |
| Rok vydání: |
1977 |
| Předmět: |
|
| Zdroj: |
Physical Review C. 15:1453-1466 |
| ISSN: |
0556-2813 |
| DOI: |
10.1103/physrevc.15.1453 |
| Popis: |
Samples of /sup 128/Cs(3.9 min) in equilibrium with its parent /sup 128/Ba(2.4 day) have been produced by approx.800-MeV proton-induced spallation in praseodymium metal foils. Chemical purification and isotope separation have been performed to produce pure samples. Measurements of ..gamma..-ray singles and ..gamma..-..gamma.. coincidence spectra have been made. A total of 66 ..gamma.. rays between 442 and 3104 keV are assigned to the decay of /sup 128/Cs, 57 of which have been placed in a proposed level scheme for /sup 128/Xe involving 22 established and 3 tentative excited states. Absolute ..gamma..-ray intensities have been computed based on the positron and x-ray intensities. Spin and parity assignments are proposed based on the logft values and the existence of ..gamma.. rays depopulating the states. The first excited 0/sup +/ state is found to occur at 1582 keV. Evidence is presented which suggests that it is of predominantly ''three-phonon'' character, in agreement with some theoretical predictions for transitional nuclei in this mass region. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
