What is the half-life for spontaneous fission of various nuclei?

[levi]

I have an assignment for which I need the half-life of about 30 nuclei that decay through spontaneous fission. The total half-life is easy to find, but I need the half-life for spontaneous emission only. Does anyone know where I can find this?

thanks,
Levi

 

[Astronuc]

Spontaneous fission or spontaneous emisson?

Generally decay or emission refers to emission of alpha, beta or gamma radiation. Fission means that the parent nuclei 'split' into two new nuclei in which the mass is much greater than an alpha particle.

In any event, try http://wwwndc.tokai-sc.jaea.go.jp/CN04/index.html - which is a site in Japan, which gives the chart of nuclides. Look at the top right corner.

Otherwise, an alternative is:
http://www.nndc.bnl.gov/chart is at Brookhaven (which also seems to have problems lately).

Another alternative is - http://nucleardata.nuclear.lu.se/nucleardata/toi/perchart.htm - click on the element, then select the isotope.

As far as I know, spontaneous fission is included in the half-life calculations. Sites usually give branching ratios or fractions (%) of decay modes.

 

[levi]

Spontaneous fission is what I meant, but I'm not to familiar with these terms in English...
Anyway, thank you very much for the links, that was just what i needed!