|Message: Re: RadioactiveDecay lacks factor ln(2) in decay width-half life conversion||Not Logged In (login)|
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On Wed, 21 Oct 2015 08:34:41 GMT, Mikhail wrote:
> RadioactiveDecay database seems to have wrong conversion from decay > width into half-life: factor ln(2) is missing. In fact, when the value > is divided by ln(2) to get mean lifetime it return a number different > from expected. >
On reference output of example rdecay01 (rdecay01.out) I read :
======================== run summary ====================== The run was 100000 Co60 of 0 eV ===========================================================
Nb of generated particles:
Ni60: 100000 Emean = 29.76 eV ( 0.01263 eV --> 86.52 eV ) Ni60[1332.518]: 99996 Emean = 13.82 eV ( 1.598 eV --> 38.56 eV ) Ni60[2158.640]: 12 Emean = 1.768 eV ( 0.5076 eV --> 3.929 eV ) Ni60[2505.766]: 99870 Emean = 1.486 eV ( 0.0002692 eV --> 3.799 eV ) anti_nu_e: 100000 Emean = 223.2 keV ( 3.187 keV --> 1.487 MeV) e-: 100022 Emean = 96.73 keV ( 1.578 eV --> 1.391 MeV) gamma: 199856 Emean = 1.253 MeV ( 346.9 keV --> 2.159 MeV)
Ekin Total (Q): mean = 941.7 keV ( 318.1 keV --> 2.159 MeV)
Momentum balance (excluding gamma desexcitation): mean = 835 keV ( 1.923e-06 eV --> 2.159 MeV)
Total time of life : mean = 7.59 y half-life = 5.261 y ( 17.07 min --> 112.4 y )
This half-life is the one given in RadioactiveDecay4.2 :
# 60CO ( 1925.28 D ) # Excitation Halflife Mode Daughter Ex Intensity Q P 0.000000 1.6634e+08
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