A b s t r a c t : N u c l e a r s t r u c t u r e d a t a p e r t a i n i n g t o a l l k n o w n A = 1 6 6 n u c l i d e s ( G d , T b , D y , H o , E r , T m , Y b , L u , H f , T a , W , R e , O s , I r , P t ) h a v e b e e n c o m p i l e d a n d e v a l u a t e d , a n d i n c o r p o r a t e d i n t o t h e E N S D F d a t a f i l e . T h i s e v a l u a t i o n f o r A = 1 6 6 s u p e r s e d e s t h e p r e v i o u s p u b l i c a t i o n ( E . N . S h u r s h i k o v a n d N . V . T i m o f e e v a , N u c l e a r D a t a S h e e t s 6 7 , 4 5 ( 1 9 9 2 ) ( l i t e r a t u r e c u t o f f d a t e 1 O c t o b e r 1 9 9 0 ) ) a n d t h e r e v i s i o n b y C . M . B a g l i n o f 1 6 6 W ( l i t e r a t u r e c u t o f f d a t e 1 6 A p r i l 2 0 0 0 ) . I t i n c l u d e s l i t e r a t u r e a v a i l a b l e b y 1 M a r c h 2 0 0 8 . S u b s e q u e n t t o t h e p r e v i o u s e v a l u a t i o n , 1 6 6 G d h a s b e e n o b s e r v e d f o r t h e f i r s t t i m e a n d t h e f i r s t o b s e r v a t i o n s o f e x c i t e d states in 1 6 6 Tb, 1 6 6 Re, 1 6 6 Os and 1 6 6 Ir have been reported; also, knowledge of collective structure in 1 6 6 Dy, 1 6 6 Ho, 1 6 6 E r , 1 6 6 T m , 1 6 6 Y b , 1 6 6 L u , 1 6 6 H f , a n d 1 6 6 T a h a s b e e n c o n s i d e r a b l y e x p a n d e d . H o w e v e r , t h e s t r u c t u r e s u g g e s t e d h e r e f o r 1 6 6 R e i s h i g h l y t e n t a t i v e a n d a f u r t h e r , m o r e d e t a i l e d s t u d y o f α d e c a y i n t o ( a n d o u t o f )
A c k n o w l e d g m e n t s : T h e e v a l u a t o r i s g r a t e f u l t o t h e r e v i e w e r o f t h i s m a s s c h a i n f o r a t h o r o u g h r e a d i n g o f t h e manuscript and for constructive comments; the evaluator also thanks the XUNDL database compilers (D. Reed, M.Lee, B. Singh) for initial data entry for 10 publications.
* T h i s w o r k w a s s u p p o r t e d b y t h e D i r e c t o r , O f f i c e o f S c i e n c e , O f f i c e o f N u c l e a r P h y s i c s o f t h e U . S . D e p a r t m e n t of Energy under contracts DE-AC03-76SF00098 and DE-AC02-05CH11231.G e n e r a l C o m m e n t s : U n c e r t a i n t i e s o f a b s o l u t e γ -r a y i n t e n s i t i e s a r e c a l c u l a t e d u s i n g t h e m e t h o d o f B r o w n e (1986Br21).Throughout this evaluation, rotational band parameters are calculated from the standard energy equation:w h e r e A i s g i v e n i n k e V , B i s g i v e n i n e V , a n d t h e d e c o u p l i n g c o n s t a n t a i s d i m e n s i o n l e s s . W h e n n o t e x p l i c i t l y s t a t e d , B i s a s s u m e d t o b e 0 . T h e m i n i m u m n u m b e r p o s s i b l e o f t h e l o w e s t e n e r g y l e v e l s w a s u s e d t o calculate each set of parameters, unless noted otherwise.T h e o r e t i c a l c o n v e r s i o n c o e f f i c i e n t d a t a a r e f r o m r e l a t i v i s t i c D i r a c -F o c k c a l c u l a t i o n s u s i n g t h e f r o z e n -o r b i t a l approximation (2005KiZT).
