174OS    178PT A DECAY                 1998AK04                  99NDS    199908
174OS  H TYP=FUL$AUT=E. BROWNE, HUO JUNDE$CIT=NDS 87, 15 (1999)$CUT=1-Nov-1998$
178PT  P 0.0          0+               21.1 S    6              5573      3
174OS  N                       0.046   31
174OS C  The measured half-lives are 22 S 2 (1993Me13), 21 S 1 (1982Bo04),
174OS2C  19 S 2 (1970Ha18), 21.2 S 8 (1968De01) and 21.3 S 15 (1966Si08).
174OS3C  T1/2(178PT)=21.1 S 6, the weighted average of the measured values
174OS4C  is adopted in 1994Br18, and used here.
174OS C
174OS C  The intensities of IA(5446A)=1.3% and IA(5284A)=0.07% were obtained by
174OS2C  1966Si08 from the relative ALPHA intensities and the relative (16O,XN)
174OS3C  production cross-sections of platinum isotopes for 168YB-174YB
174OS4C  enriched targets. It was assumed that the ratios of maximum cross
174OS5C  sections for x=6,7, and 8 are the same for all ytterbium targets.
174OS C  The ALPHA intensities of IA(5446A)=7.2% 8 and IA(5284A)=0.20% 7,
174OS2C  reported by 1970Ha18, give ALPHA-decay branching=7.4% 9.
174OS3C  The isotope was produced in the 182HG A DECAY, and ALPHA branching
174OS4C  was obtained by comparing parent and daughter ALPHA activities.
174OS5C  The 5284-KEV ALPHA peak was obscured in the singles spectrum by
174OS6C  210PO contamination; its assignment was based on ALPHA-GAMMA
174OS7C  coincidences. The reported IA(5446A)/IA(5284A) ratio was obtained by
174OS8C  assuming 10% of the 5284-KEV ALPHA peak was from 182AU, produced in
174OS9C  the BETA decay of 182HG.
174OS C  The ALPHA branching was reported by 1980Sc09 as 7.5% 3, presumably for
174OS2C  the main ALPHA group. In this case, the 5284A intensity should be
174OS3C  added. The isotope 178PT was produced by 1980Sc09 in 186PB A DECAY.
174OS4C  The ALPHA branching of 178PT was determined from comparison of
174OS5C  intensities of parent and daughter activities in the same spectrum.
174OS6C  The considered activities of 178IR and 174OS (BETA and ALPHA
174OS7C  daughters of 178PT) and their intensities are not given in 1980Sc09.
174OS C  %A=7.7 3 is adopted in 1994Br18 from IA(5440A)=7.5% 3 (1980Sc09)
174OS2C  and IA(5284A)/IA(5440A)=0.028 10 (1970Ha18). Adoption of the ratio
174OS3C  IA(5284A)/IA(5440A)=0.07/1.3=0.054 (1966Si08) would give %A=7.9 4.
174OS C  The calculated radius parameters are R0=1.570 3 and R0=1.484,
174OS2C  for %A=7.7 3 and %A=1.4, respectively. The R0 systematics suggests
174OS3C  R0=1.540 from which the partial ALPHA half-life of the 5446A is
174OS4C  calculated as 4.6E+2 S, yielding an absolute value of IA(5446A)=4.6%
174OS5C  and therefore, the ALPHA branching of %A=4.8.
174OS C  Based on the uncertainties of the experimental branchings due to
174OS2C  the assumptions had been made and based on the R0 systematics,
174OS3C  %A=4.6 31, an average value with a large uncertainty in order to
174OS4C  cover all values is suggested here.
174OS C
174OS C  QA(178PT)=5573.4 26 is from 1995Au04. EA=5446 3 gives QA=5571 3.
174OS CA IA        ALPHA intensity per 100 ALPHA decays. Relative ALPHA
174OS2CA intensities of IA(to 2+)/IA(to 0+)=7/130=0.054, measured by 1966Si08,
174OS3CA is recommended here, since the ALPHA peaks in the spectrum of 1966Si08
174OS4CA were not obscured. IA(to 2+)/IA(to 0+)=0.028 10 was measured by
174OS5CA 1970Ha18. This ratio gives IA(5446A)=97.3, IA(5284A)=2.7 per 100
174OS6CA A DECAYS. Uncertainties on IA (no DIA's are reported in 1966Si08)
174OS7CA are assigned here such that IA's of 1970Ha18 will be covered.
174OS CA HF        R0(174OS)=1.54 3 is calculated by requiring HF(5446A)=1.0.
174OS  L 0.0         0+
174OS  A 5446      3 94.9    24 1.0
174OS CA E         the measured ALPHA energies (adjusted, as recommended
174OS2CA by 1991Ry01, for the changes in the calibration energies) are
174OS3CA 5440 10 (1966Si08), 5443 10 (1978Fa16), 5458 5 (1979Ha10), 5445 3
174OS4CA (1982Bo04). EA=5446 3 is recommended by 1991Ry01.
174OS  L 158.7     3 2+
174OS  A 5291      4 5.1     24 3.3    16
174OS CA E         calculated from E(level)=158.7 3 and EA(GS)=5446 3.