The first excited 0+ state of Kr appears to have a noncollective nature, in contrast to the 03 and other low-spin states in this nucleus. This is corroborated by a conversion-electron measurement of the 0&+~0+& and the 0+3 -+0~transitions in Kr, following the decay of Rbg. The values 8(EO;Oq+ -+0+q) =3.1(5) e fm" and X3» --8(EO;Oq+ -+0+q}/8(E2;0+3 -+2+&) =0.097(24) have been deduced from the intensities of the conversion lines, observed with a mini-orange spectrometer. Previous theoretical and experimental investigations of Kr are reviewed.Electric monopole transitions, the dominant transition mode between 0+ states, can provide valuable information about excited 0+ states of different nature coexisting in the same nucleus. However, since these transitions cannot proceed via gamma decay, their observation frequently requires special experimental effort. Thus, in spite of the progress in detection techniques made in the last few years, ' experimental information about EO transitions is still scarce, even for nuclei which are otherwise easily accessible for investigation.
A special arrangement of electron spectrometers has been used to search for a weak ES y transition in Zr, The experiment establishes the upper limit:Doubly magic Zr has an unusual spectrum of low-lying states: The first four, including the ground state, have spins and parities 0+, 0+, 2+, and 5 . The electromagnetic transition rates are known for all but one of the possible transitions between these four states, including the 2319. 0 keV
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