Abstract
A new radioisotope of half-life 21 min has been observed in the neutron deficient isotopes of niobium produced by ( p, pxn) and ( p, 2 pxn) reactions with 340 MeV protons. The activity is assigned to 88Nb on the basis of its genetic relationship to 88Zr. Half-lives of the known isotopes 89Nb, 89 m Nb and 90Nb have been determined as 2·0 hr, 42 min and 14·7 hr respectively. Positron and γ-ray spectra of these isotopes have been studied. 88Nb emits 3·2 MeV positrons and 0·20, 0·72, 0·97 and 1·42 MeV γ-rays.
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