High spin shell model states in the isotope Tc 47 43 90
1993; American Institute of Physics; Volume: 47; Issue: 6 Linguagem: Inglês
10.1103/physrevc.47.2574
ISSN1538-4497
AutoresD. Rudolph, C. J. Gross, M. K. Kabadiyski, K. P. Lieb, M. Weiszflog, H. Grawe, J. Heese, K. H. Maier, J. Eberth,
Tópico(s)Advanced Chemical Physics Studies
ResumoHigh spin states in the nucleus $^{90}\mathrm{Tc}$ have been identified for the first time via the fusion evaporation reaction $^{58}\mathrm{Ni}$${(}^{36}$Ar,3pn${)}^{90}$Tc, at 149 MeV beam energy. The OSIRIS spectrometer with an additional high purity Ge detector at 162\ifmmode^\circ\else\textdegree\fi{} and several particle detectors were used to measure \ensuremath{\gamma}\ensuremath{\gamma} and particle-\ensuremath{\gamma}\ensuremath{\gamma} coincidences, directional correlations of oriented states (DCO's), and line shapes due to Doppler-shift attenuation (DSA). Furthermore, an angular distribution experiment was performed with the reaction $^{58}\mathrm{Ni}$${(}^{35}$Cl,2pn${)}^{90}$Tc, at 120 MeV beam energy. Some 90 transitions were placed into a level scheme comprising 45 levels reaching up to a possible spin I=26\ensuremath{\Elzxh} at 11.2 MeV excitation energy. Definite spin assignments for more than half of the levels were made via angular distribution coefficients and DCO ratios. Shell model calculations were performed in a restricted configuration space consisting of only the ${\mathit{p}}_{1/2}$ and ${\mathit{g}}_{9/2}$ orbitals. The level scheme can be reproduced very well up to spin I=21\ensuremath{\Elzxh}. The predicted structure of the states is discussed and compared to those of neighboring isotopes.
Referência(s)