New neutron deficient isotopes of krypton

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Abstract

Two new activities have been found in the neutron deficient isotopes of krypton produced by [p, xn] reactions on bromine. The half-lives have been determined as 12·0 ± 1·0 min and 5·5 ± 0·4 min. These activities are assigned to 74Kr and 75Kr respectively on the basis of their genetic relationships with bromine isotopes.

The isotope 74Br has been observed to emit a positron with a maximum energy of 4·7 MeV and the half-life of this isotope is 25·7 ± 0·9 min.

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Present address: College of Technology, Liverpool, 3.

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