High K bands in mid-supershell nuclei
Butler PA., Humphreys RD., Greenlees PT., Herzberg RD., Jenkins DG., Jones GD., Kankaanpää H., Kettunen H., Rahkila P., Scholey C., Uusitalo J., Amzal N., Andreoiu C., Andreyev A., Appelbe D., Bastin JE., Brew PMT., Eskola K., Freeman SJ., Gerl J., Hammond NJ., Hauschild K., Helariutta K., Hessberger FP., Hürstel A., Ikin PJC., Jones PM., Joss DT., Julin R., Juutinen S., Keenan A., Khoo TL., Korten W., Kuusiniemi P., Le Coz Y., Leino M., Leppänen AP., Muikku M., Nieminen P., Ødegård SW., Page RD., Page T., Pakarinen J., Reiter P., Simpson J., Sletten G., Theisen C., Varley BJ., Wollersheim HJ.
The spectrum of prompt conversion electrons emitted by excited 254No nuclei has been measured, revealing discrete lines arising from transitions within the ground state band. A striking feature is a broad distribution that peaks near 100 keV and comprises high multiplicity electron cascades, probably originating from Ml transitions within rotational bands built on high K states. Evidence for the existence of isomeric states in 254No is presented.