Decay properties of 153Yb and 153Tm; Excitation energies of the s1/2 and h11/2 proton states in 153Tm
Abstract
The decay properties of 153Yb and 153Tm, produced in 64Zn bombardments of 92Mo, were investigated following on-line mass separation. A decay scheme, incorporating 34 transitions and 25 levels in 153Tm, was constructed for 153Yb. It establishes the s1/2 proton level in 153Tm to be isomeric at an excitation energy of 43.2 keV. The α-decay branch of the h11/2 153Tm ground state was determined to be 91+/-3%. In addition, a partial decay scheme was put together for the 9% β+ branch. About 66% of this β+ decay proceeds to the h9/2 neutron state located at 299.3 keV in 153Er. Only one transition, 266.5 keV, could be assigned to the β+ decay of the 153Tm s1/2 isomer; it is suggested that the γ ray deexcites the p3/2 neutron level to the f7/2 153Er ground state. Based on the intensity of this 266.5-keV γ ray, the isomer's α branch was estimated to be ~93%.
- Publication:
-
Physical Review C
- Pub Date:
- February 1989
- DOI:
- 10.1103/PhysRevC.39.636
- Bibcode:
- 1989PhRvC..39..636K
- Keywords:
-
- 23.20.Lv;
- 23.60.+e;
- 27.70.+q;
- gamma transitions and level energies;
- Alpha decay;
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