184OS    188PT A DECAY                                           10NDS    201002
184OS  H TYP=FUL$AUT=CORAL M. BAGLIN$CIT=NDS 111,275 (2010)$CUT=1-Oct-2009$
184OS C  T1/2(188PT)=10.2 D 3, the weighted average of the measured half-lives
184OS2C  of 10.3 D 4 (1954Na25), 10.0 D 3 (1955Sm42), 10.2 D 3 (1963Gr08) and
184OS3C  10.5 D 10 (1963Ka17).
184OS C
184OS C  %A(188PT)=2.6E-5 3 is weighted average of 3.0E-5% 6 (1963GR08),
184OS2C  2.2E-5% 5 (1979Ha10) and 2.8E-5% 5 (1978El11). Other value:
184OS3C  5.0E-5 25 (1963Ka17).
184OS D  %A=2.2E-5 5 WAS LISTED BY 1979Ha10; THEIR METHOD OF DETERMINATION
184OS2D  IS NOT CLEAR. THE 188PT AND 188HG ISOTOPES WERE PRODUCED IN
184OS3D  Pb(P,SPALLATION), PRODUCTS WERE MASS SEPARATED. THE AUTHORS STATE
184OS4D  THAT "THE TOTAL AMOUNT OF 188HG ATOMS COLLECTED DURING THE EXPERIMENT
184OS5D  BY ABSOLUTE GAMMA-COUNTING OF THE RESIDUAL ACTIVITY OF 188PT ON THE
184OS6D  COLLECTOR FOIL."  "BY EXTENDING THE MEASURING TIME TO SEVERAL
184OS7D  DAYS, AN ALPHA-BRANCHING RATIO OF (2.2+-0.5)E-7 WAS DETERMINED,
184OS8D  IN GOOD AGREEMENT WITH THE FINDINGS OF KARRAS, ET AL (1963Ka17)".
184OS9D  THE %A FROM THIS REFERENCE, THEREFORE, IS NOT INCLUDED IN AVERAGE.
184OS D  THE AUTHORS OF 1963Ka17 STATED THAT "BY MEASURING THE Ir-Os K X-RAY
184OS2D  ACTIVITY OF THE SOURCE, THE ALPHA BRANCHING WAS FOUND TO BE 0.5E-6
184OS3D  WITHIN A FACTOR OF TWO." NO GAMMA TRANSITION IN A DECAY TO 184OS
184OS4D  HAS BEEN OBSERVED. NO EXPLANATION IS GIVEN BY THE AUTHORS FOR Os
184OS5D  K X-RAY SOURCE. THE %A FROM THIS REFERENCE IS NOT CONSIDERED HERE
184OS6D  IN ADOPTING THE ALPHA BRANCHING.
184OS C
184OS C  QA(188PT)=4008 5 is recommended by 2003Au03 AND 2009AUZZ.
184OS CA HF        R0(184OS)=1.464 7 is calculated by requiring
184OS2CA the hindrance factor for the 3922-KEV ALPHA to be 1.0.  I(3922A)=95 5
184OS3CA (FROM IA>90%) is used in computation.
188PT  P 0.0         0+                10.2 D    3              4008      5
184OS  N                       2.6E-7  3
184OS  L 0.0         0+
184OS  A 3919      7  95      5 1.0
184OS CA E         WEIGHTED AVERAGE OF 3905 15 (1979Ha10),
184OS2CA 3915 10 (1978El11), and 3930 10 (1963Gr08). THIS EA IMPLIES
184OS3CA QA=4004 7 (cf. 4008 5 FROM 2003AU03).
184OS CA IA        only one ALPHA group has been observed. Upper limit on
184OS2CA intensity of an unobserved 3804-KEV ALPHA transition to the 2+ state
184OS3CA at 119.77 KEV is calculated to be <10 per 100 A DECAYS by requiring
184OS4CA its hindrance to be greater than 1.