Nuclear Data Sheets for A = 87

Abstract

The evaluated experimental data are presented for 14 known nuclides of mass 87 (Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru). New datasets have been added for 87 Ga, 87 Se, 87 Kr, 87 Rb, 87 Sr, 87 Nb, and 87 Tc.The observation of and new lifetime measurements for 87 As at the NSCL Coupled Cyclotron Facility and the Oak Ridge Isochronous Cyclotron at the HRIBF-ORNL Facility are included in the adopted levels for this isotope.The new evaluation also includes an isomeric level at unknown energy for 8 7 Tc, changes to the adopted levels f o r 8 7 N b b a s e d o n n e w l y p u b l i s h e d d a t a i n c l u d i n g a n e x t e n s i o n o f t h e h i g h s p i n l e v e l s a n d n e w l i f e t i m e m e a s u r e m e n t s , a n d n e w h e a v y i o n d a t a f o r 8 7 K r . N e w h i g h s p i n l e v e l s f o r 8 7 R b w e r e o b s e r v e d , i n d i c a t i n g p o s s i b l e n e u t r o n c o r e e x c i t a t i o n s . I n a d d i t i o n , t h e g r o u n d s t a t e l i f e t i m e o f 8 7 R b h a s b e e n r e v i s e d a n d a n e w lifetime measurement for an excited level in 8 7 Rb indicates a possible proton spin flip. New excitation levels have been observed for the first time in 8 7 Se. New direct and precise measurement of atomic masses of 8 7 Tc, 8 7 Mo, 8 7 Nb, 8 7 Zr, 8 7 Mo and 8 7 Tc have greatly improved the Q value landscape in this mass region. This work supersedes the previous A=87 evaluation published in 2002He09, and Q values for all isotopes were updated to incorporate the mass evaluation in 2012Wa38. General Policies and Organization of Material: see http://www.nndc.bnl.gov/nds/NDSPolicies.pdf. G e n e r a l C o m m e n t s : I n s p i t e o f s i g n i f i c a n t e x p e r i m e n t a l w o r k o n t h e i s o b a r i c n u c l e i o f t h i s m a s s c h a i n s o m e d e f i c i e n c i e s r e m a i n . T h e i d e n t i f i c a t i o n o f 8 7 R u i s o t o p e w a s d o n e v i a p r o j e c t i l e f r a g m e n t a t i o n . H o w e v e r , excited state data remain nonexistent. Fragmentation data revealed new levels in 8 7 Tc, but the connection tothe ground state has yet to be clarified and excited levels have yet to be established for 8 7 As 8 7 Ga, and 8 7 Ge.The ground state spin and parity of 87 Br was changed to reflect new in-line measurements, but is tentative and more experimental work would be useful for further clarification.Cutoff Date: Literature available up to July 27, 2015 has been consulted. 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 s a r e g r a t e f u l t o t h eThe statistical analysis of γ -ray data and deduced level schemes is carried out through computer codes available a t N N D C , B N L w e b s i t e : w w w . n n d c . b n l . g o v . T h e d i r e c t f e e d i n g s t o e x c i t e d s t a t e s i n β -a n d ε d e c a y s h a v e g e n e r a l l y b e e n c o m p u t e d f r o m I ( γ + c e ) i n t e n s i t y b a l a n c e s a t e a c h l e v e l ; t h e a s s o c i a t e d l o g f t v a l u e s a r e calculated usi...

New and comprehensive β - and βp -decay spectroscopy results in the vicinity of Sn100

“…As shown in the inset of Fig. 26, the 1741-keV γ ray was delayed with T γ 1/2 = 0.76 (35) μs. Excluding M1/E 2 multipolarities and assuming 100% branching for this γ ray, the experimental EM transition strengths for possible multipolarities to be quite compatible with literature B(E 3) for isomeric states in this region of nuclides, such as the 267-keV γ ray in 95 Ag [82], the 743-keV γ ray in 96 Ag [18], and the 1651-keV γ ray in 94 Pd [21,22].…”

“…With a few exceptions, the absence of β p emitters in the descendant generations simplified the fit functions for β p decay analyses. The T 1/2 and b EC of the βand β p-daughter nuclei in the Bateman equation were allowed to vary within 2σ uncertainties based on the literature values listed in the NUBASE2016 database [34] and Evaluated Nuclear Structure Data Files (ENSDF) for A = 87-100 isotopes [35][36][37][38][39][40][41][42][43][44][45][46][47][48]. The fit parameters of the parent decay function were free.…”

Excited states in Br87 populated in β decay of Se87

“…Of prime importance for spin-parity assignments of excited states in 87 Br is the knowledge of its ground-state spin and parity. In the compilation [25] this was changed to 5/2 − , to account for measured spin values in 87 Kr. [26].…”

Excitation functions for (p,x) reactions of niobium in the energy range of Ep = 40–90 MeV

“…Every year, approximately 17 million nuclear medicine procedures (both diagnostic and therapeutic) are performed in the U.S. alone [1,2]. Most of the radionuclides currently used for these procedures are produced by low-(E < 30 MeV / A) and intermediate-energy (30 < E < 200 MeV / A) accelerators, e.g., 11 C, 18 F, (t 1/2 = 5.591 ± 0.003 d; J π = 6 + ), 58m Co (t 1/2 = 9.10 ± 0.09 h; J π = 5 + ) to 58g Co (t 1/2 = 70.86 ± 0.06 d; J π = 2 + ), 85m Y (t 1/2 = 4.86 ± 0.13 h; J π = 9 /2 + ) to 85g Y (t 1/2 = 2.68 ± 0.05 h; J π = 1 /2 − ), 87m Y (t 1/2 = 13.37 ± 0.03 h; J π = 9 /2 + ) to 87g Y (t 1/2 = 79.8 ± 0.3 h; J π = 1 /2 − ), and 89m Nb (t 1/2 = 66 ± 2 m; J π = 1 /2 − ) to 89g Nb (t 1/2 = 2.03 ± 0.07 h; J π = 9 /2 + ) ratios [11][12][13][14][15]. The measurements described in this paper involve the use of multiple monitor reactions in conjunction with statistical calculations and proton transport simulations to reduce systematic uncertainties in beam energy assignments, leading to some of the first and most precise measurements for many of the excitation functions reported here.…”