Levels in 221Fr fed by the α decay of 225Ac
Abstract
The α decay of 225Ac to 221Fr was reinvestigated by γ-ray spectroscopic studies with HPGe detectors and 225Ac sources purified using continuous elution processes. Energies and intensities of about 120 γ-ray transitions were measured. Among these, 40 are reported for the first time. A 221Fr level scheme with 46 excited states and 124 transitions is proposed. The level structure is described in terms of a reflection asymmetric structure with parity doublet bands Kπ=1/2+/-, 3/2+/-, 5/2+/-, and 3/2+/- in order of increasing energy. Both strong and intermediate coupling models have been shown to be in good agreement with the experimental data.
- Publication:
-
Physical Review C
- Pub Date:
- December 2000
- DOI:
- 10.1103/PhysRevC.62.064306
- Bibcode:
- 2000PhRvC..62f4306A
- Keywords:
-
- 21.10.-k;
- 21.60.Ev;
- 23.60.+e;
- 82.55.+e;
- Properties of nuclei;
- nuclear energy levels;
- Collective models;
- Alpha decay