In-Beam Electron Conversion from Yrast Levels ofSe72,74,76,78,Kr78,80,82,84,Te114,116,118,120,122,124,126, andCe130,132,134,136,138Excited by (α,xn)

A new in-beam electron spectrometer was used to measure electron conversion intensities of cascade transitions between yrast levels of the nuclei listed above. A few 2+′→2+ transitions were also measured. Altogether, 103 electron lines were measured during and between cyclotron bursts of 25-62-MeV $\alpha$ particles. The conversion coefficients, based on $\gamma$ intensities from previous work at this laboratory, are compatible with the assignments of all but one of three transitions previously studied in this laboratory. The exception is the 1015-keV transition in ${}_{}{}^{78}{}_{}{}^{}\mathrm{Kr}$, earlier obscured by a 1013-keV transition due to Al. These yrast level energies are correlated with a semi-empirical model. The complementary nature of measurements of in-beam angular distributions of $\gamma$ rays and measurements of electron conversion coefficients is discussed.