204HG 204TL EC DECAY 10NDS 201002
204HG H TYP=FUL$AUT=C.J. CHIARA and F.G. KONDEV$CIT=NDS 111,141 (2010)$
204HG2 H CUT=1-Oct-2009$
204HG C Measured CL/CK=0.42 5 (1961Jo12), 0.41 3 (1962Le05), 0.48 4 (1963Ro32),
204HGxC 0.60 6 (1964Ch17), 0.55 5 (1966Kl02).
204HG2C From Q value and EC decay theory, CL/CK=0.519 2.
204HG D Ratio of CL and CK values from LOGFT.
204HG C Q+ deduced from measured CL/CK ratio: 410 +30-23 (1962Le05, with
204HGxC correction by 1964Ch17), 313 +17-14 (1964Ch17), 324 +21-16 (1966Kl02).
204HGxC Q+ from fit to internal bremsstrahlung spectrum: 376 20 (1956Ju07),
204HG3C 325 20 (1973La17), 357 15 for fit with Coulomb-free theory (1979Zi02).
204HGxC End-point energy from internal bremsstrahlung spectrum:
204HGxC 310 10 (1962Bi04).
204HG C Internal bremsstrahlung photons per 100 CK: 3.2E-3 5 (1973La17),
204HG2C 2.17E-3 26 (1979Zi02), 2.8E-3 2 (2003Ku28).
204HG C Others: 1967Ha39, 1980La02.
204HG D $--------------------------------------------------
204HG D $--------- Notes from the refs follow -------------
204HG D $--------------------------------------------------
204HG D 1956Ju07: NaI (x2?); coinc between Hg K x-rays and gammas; end point
204HGxD of 293(20) keV + Hg K electron BE = 376(20) keV.
204HG D
204HG D 1961Jo12: NaI(204Tl) inner crystal fitted within well-type NaI(Tl) and
204HGxD covered with NaI(Tl) lid; L x-rays and Augers absorbed in inner
204HGxD crystal, some K's make it to outer; L/K capture ratio = 0.42(5), mean
204HGxD value over several runs; K/beta- ratio = 0.0155(10).
204HG D
204HG D 1962Bi04: 80mil thick, 1.5in diameter NaI with 5mil Be window for K
204HGxD x rays, 50% resolution at 5.9 keV (? true for Tl measurement?);
204HGxD 1in x 1in NaI for IB detection, 10% resolution at 662 keV; end pt
204HGxD of IB spectrum determined by coinc between 70.8-keV Hg x rays and IB
204HGxD to be 310(10) keV.
204HG D
204HG D 1962Le05 (auf Deutsch): NaI(204Tl), 0.26uCi of 204Tl put in lattice;
204HGxD L/K capture ratio = 0.41(3); disintegration energy (Q value) derived
204HGxD from L/K ratio, Q = 442+30-24 keV(*); EC/beta- ratio = 2.15(6)% (unc
204HGxD quoted as 0.05% in text); K/beta- ratio = 1.53(5)%.
204HGxD [1964Ch17 point out that this work had a value 2x too big in their
204HGxD equation, and that really Q = 410+30-23 keV.]
204HG D
204HG D 1964Ch17: two NaI, w/absorbers to block Auger e-'s, to detect K- (only)
204HGxD or L- (only) x rays; measured L/K capture ratio = 0.60(6), 5.1% exp'tal
204HGxD unc, the rest from uncs in K fluor.yield and other parameters;
204HGxD Q = 313+17-14 keV derived from L/K ratio.
204HGxD Two NaI for x rays and beta- activity on
204HGxD 4pi-beta-gamma coinc apparatus to get K/beta- ratio = 0.0159(4), which
204HGxD then gives EC/beta- = 0.0254(12). [Uses omegaK = 0.954(5).]
204HG D
204HG D 1966Kl02: NaI(204Tl) dets of 13 different shapes and sizes; measured
204HGxD L/K ratio = 0.55(5); EC/beta- ratio = 2.29(6)%; K/beta- ratio =
204HGxD 1.48(15)%; Q = 324+21-16 keV. [Uses omegaK = 0.954.]
204HG D
204HG D 1973La17: two (7.6cm)^2 NaI(Tl) dets; intensity of internal
204HGxD bremsstrahlung in interval 103 keV to end point = 3.2(5)x10^-5
204HGxD photons per K EC. [Uses a constant relativistic correction factor
204HGxD R_1s, which is avg of value over range 110 keV to end pt.]
204HGxD Derived Q = 385(20) keV for approx fit with R1s fixed, 325(20) when
204HGxD fit to exact spectrum shape with R1s varying.
204HG D
204HG D 1979Zi02: hi-res Ge(Li) with 0.125mm Be window for x rays,
204HGxD (7.6cm)^2 NaI(Tl) det for IB spectrum; intensity of internal
204HGxD bremsstrahlung in interval 103 to 307 keV = 2.17(26)x10^-5
204HGxD photons per K EC, uncs are 7% from counting stats, 5% from source
204HGxD intensity, 6% Ge(Li) eff, 4% NaI(Tl) eff and P/T ratios, and 3%
204HGxD coinc eff; end-pt Km = 307(15) keV for full theory, 272(15) keV for
204HGxD Coulomb-free theory; transition E (Qval?) = 392(15) keV for full
204HGxD theory, 357(15) keV for Coulomb-free theory. [Q=Km+85]
204HG D
204HG D 1980La02: 204Tl in solution; Ge(Li) to detect Hg K x rays following
204HGxD K EC, FWHM = 2.1 keV at 1.33 MeV, 6.15% eff; 3mm Si(Li) with Be window
204HGxD to study low-E photons; K EC/beta- ratio from Si(Li) = 1.17(7)%, from
204HGxD Ge(Li) = 1.35(11)% ==> wtd avg 1.22(6)%; assuming K EC/tot EC = 0.592,
204HGxD EC/beta- = 2.05(13)% and EC/(EC + beta-) = 2.01(13)%.
204HG D
204HG D 1990Sc08: two Ge(Li)'s for Eg>100keV, FWHM=2.9 and 2.2 keV at 1.33MeV;
204HGxD HPGe for 6keV to 2MeV, Be window, FWHM=1.86keV at 1.33MeV and 750eV at
204HGxD 5.9keV; planar Si(Li) for Eg<20keV, Be window, FWHM=205eV at 5.9keV;
204HGxD proportional counter at atm pressure for 4pi-beta counting;
204HGxD six single measurements, 20000s each; 2g of 204Tl.
204HGxD Ka2, E=68.9, P=0.474(20)%; Ka1, E=70.8, P=0.812(34)%; Kb1, E=80.1,
204HGxD P=0.273(10)%; Kb2, E=82.5, P=0.081(3)% (P=photon emission prob.)
204HGxD Total P=1.64(4)% (uncs added quadratically, not linearly=0.07!).
204HGxD Uncs are 1sigma, from peak fitting, eff curves, activity determination,
204HGxD and correction factor added in quadrature.
204HG D
204HG D 1995Da32: two large-volume (90cm^3) Gamma-X and one LEPS HPGe dets,
204HGxD respective FWHM(eV) = 818, 653, 363 at 59.54 keV and 852, 698, 420
204HGxD at 88.04 keV; K x ray intensities normalized to Ka1 are
204HGxD Ka1, E=70.8, P==100; Ka2, E=68.9, P=59.33(41); Kb1, E=80.2,
204HGxD P=34.24(31); Kb2, E=82.5, P=10.15(11).
204HG D
204HG D 2003Ku28: 204Tl produced by 203Tl(n,g) reaction in reactor...;
204HGxD HPGe detector with 0.5 mm Be window for EC photons, 45% eff,
204HGxD FWHM = 1.89 keV at 1.33 MeV; another HPGe detector with 0.5 mm Be
204HGxD window for x rays, FWHM = 570 eV at 122 keV. [Comparison with "full"
204HGxD theory of Zon and Rapoport with relativistic effects, Coulomb effects,
204HGxD and generalized to any order forbiddenness (1968Zo01). However,
204HGxD Coulomb-free version (Z -> 0) seems to work better.] Total IB prob
204HGxD per K capture from interval 100 keV to end pt = 2.8(2)x10^-5 (average
204HGxD of two measurements).
204HG D $--------------------------------------------------
204HG D $--------- End of notes from the refs -------------
204HG D $--------------------------------------------------
204HG CG No gammas detected. XK absolute intensities studied in
204HG2CG 4PI geometry. XKA2=0.47 2, XKA1=0.81 3, XKB1=0.273 10, XKB2=0.081 3
204HG3CG per 100 decays (1990Sc08).
204TL P 0.0 2- 3.783 Y 12 344.3 13
204HG N 0.0292 7 1
204HG CN BR$from I(XK)=1.64% 4 by 1990Sc08, K fluorescence yield=0.962 4 from
204HG2CN 1996Sc06, and CK/EC=0.5836 14 (based on Q=344.3 13 and theory for
204HG3CN first forbidden unique EC decay).
204HG DN $ BR = I(XK)/[omegaK*(CK/EC)]
204HGxCN 1990Sc08 quote the absolute measured K|a{-1}, K|a{-2}, K|b{-1},
204HGxCN K|b{-2} intensities as 0.812% 34, 0.474% 20, 0.273% 10, 0.081% 3,
204HGxCN respectively; values have been summed to give the above I(XK), with
204HGxCN uncertainties added in quadrature. 1995Da32 measured relative XK values
204HGxCN K|a{-1} : K|a{-2} : K|b{-1} : K|b{-2} =
204HGxCN 100 : 59.3 4 : 34.2 3 : 10.15 11, in agreement with relative values by
204HGxCN 1990Sc08.
204HG DN $For the record, normalizing 1990Sc08 to the Ka1 gives
204HG2DN 100 : 58.4 35 : 33.6 19 : 10.0 6.
204HG L 0 0+
204HG E 100 9.496 13 1U
204HGS E CK=0.5836 14$CL=0.3029 10$CM+=0.1135 5