The decay scheme of 1.3 h 174Ta

A. Charvet , Do Huu Phuoc , R. Duffait , A. Emsallem , R. Chéry

The decay of 174Ta (T½ =1.3 h) has been studied with Ge(Li) and Si(Li) detectors. Single, coincidence and sum γ-ray spectra, conversion lines and e-γ coincidence relations have been measured. The results are in good agreement with those of earlier investigations for the ground state and the beta-vibrational band. Above these bands 14 levels have been established having the following energies (in keV) spin values and parities : 1276.8 (3,4); 1318.9 (2+) ; 1394.4 (3, 4) ; 1448.9 (3- ) ; 1503.3 (4+) ; 1659.2 (4+); 2 030.1 (3, 4) ; 2124.5 (3,4) ; 2 145.5 (4+); 2198.2 (4-) ; 2 237.3 (5); 2 490.5 (3, 4) ; 2 590.7 (3, 4) and 3 023.7 (2). The level scheme accounts for 49 of the 60 transitions firmly assigned to the decay of 174Ta. The Q-value of the decay 174Ta → 174Hf was determined to be 3 845 ± 80 keV. The half life of the first 2+ level was remeasured and found to be 1.68 ± 0.08 ns. The structure of 174Ta and of the levels of 174Hf are discussed in terms of current nuclear models.

Mots clés: nuclei with 150; nuclear energy levels; nuclear spin and parity

Domaines: Articles anciens

A. Charvet, Do Huu Phuoc, R. Duffait, A. Emsallem, R. Chéry. The decay scheme of 1.3 h 174Ta. Journal de Physique, 1971, 32 (5-6), pp.359-367. ⟨10.1051/jphys:01971003205-6035900⟩. ⟨jpa-00207086⟩