New radioisotopes of niobium and molybdenum—I 88Nb

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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, 2pxn) 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, 89mNb 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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