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Forum: Hadronic Processes
Re: Warning RadioactiveDecay lacks factor ln(2) in decay width-half life conversion (Mikhail)
Date: 21 Oct, 2015
From: michel maire <michel maire>

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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1 None: Re: RadioactiveDecay lacks factor ln(2) in decay width-half life conversion   (Mikhail - 21 Oct, 2015)
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