https://doi.org/10.1140/epja/i2008-10687-1
Regular Article - Theoretical Physics
K-forbidden allowed 
transitions in heavy nuclei
1
Department of Physics, Sri Sathya Sai University, 515 134, Prasanthinilayam (A.P), India
2
Department of Physics, Sri Sathya Sai University, 560 067, Brindavan, Bangalore, India
* e-mail: soodpc@rediffmail.com
Received:
19
September
2008
Revised:
31
October
2008
Published online:
11
December
2008
The role of the band quantum number K in influencing the character of allowed transitions in heavy deformed nuclei is examined. The conditions for the occurrence of K -forbidden decays in this region are explored. Specific cases of “allowed” decays proceeding via 
K = 2 to
K = 6 channels are presented to illustrate the phenomenon. The listed
K = 2 transitions, which by themselves contribute over 10% of all the presently known allowed transitions for A
228 nuclei, are seen to have an average 
, which is clearly outside the normal range for allowed transitions. It is concluded that, wherever the -connected states can be confidently labelled using the 
quantum numbers, the K -forbiddenness is in general as significant as that involving the other two (spin and parity) quantum numbers.
PACS: 21.10.Re Collective levels – / 23.40.-s decay; double decay; electron and muon capture – / 27.90.+b 
–
© SIF, Springer-Verlag Berlin Heidelberg, 2009
