\ 58 ANTPOT. Co\ : estudo de um núcleo ímpar-ímpar na camada pf / 58Co: study of an odd-odd nucleus in the pf shell

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

14/12/2004

RESUMO

The excited states in the doubly odd nucleus \ ANTPOT. 58 CO\ have been studied using inbeam gama-ray spectroscopy. The \ ANTPOT. 58 CO\ nucleus has been produced with the fusionevaporation reaction \ ANTPOT. 51 V\ (ANTPOT. 10 B\ , p2n) at 33 MeV bombarding energy, using the SMV Pelletron accelerator of the University of São Paulo. Gamrna-gamma-charged particle coincidences were measured with the Saci-Pererê gama-ray spectrometer composed of 4 Compton-suppressed GeHP and an ancillary charged-particle detector system composed of 11 plastic phoswich scintillator ~E-E telescopes. We have found 47 new gama-transitions de-populating 37 new excited states. A level scheme extending up to an excitation energy of about 8.0 MeV and spin \ J POT. pi\ =\ 11 POT. +\ has been proposed. The spin assignments were based on the DCO (Directional Correlation from Oriented States) ratios. The experimental results were compared with Large Scale Shell Model (LSSM) calculations performed with the MSHELL and Antoine codes using the GXPFl effective interaction, developed for use in the pf shell. We have interpreted 19 excited states in the frame of the LSSM. We have measured also the lifetimes for 13 excited states of the \ ANTPOT. 58 CO\ nucleus. The lifetimes were measured with the Doppler Shift Attenuation Method (DSAM). For this study the \ ANTPOT. 58 CO\ nuclei were populated with the reaction \ ANTPOT. 51 V\ (ANTPOT. 10 B\ , p2n) at 36 MeV bombarding energy, using a target consisting of a 770\ mü\ g/\ cm POT. 2\ foil with Pb backing. The experimental values were also compared with the LSSM calculations. Experimental B(M1) reduced transition probabilities, and thus the lifetimes, are well reproduced by the theoretical model for fi v e o f the identified levels. The observed levels presented wave functions with large configuration mixing with the main configuration being \ pi\ \ f POT -1 IND. 1/2\ (PRODUTO VETORIAL) v \ p POT 2 IND. 3/2\ \ f POT 1 IND. 5/2\ ,. The results indicate that most of the excited states in the \ ANTPOT. 58 CO\ nucleus has a spherical behavior and is well reproduced considering single-particle excitations.

ASSUNTO(S)

espectroscopia de raio gama estrutura nuclear gamma ray spectroscopy nuclear reactions nuclear structure nuclei núcleos reações nucleares

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