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## Main Question or Discussion Point

how can we guess the possible decay modes for an element with three given quantities: A, Z and mass difference in MeV

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how can we guess the possible decay modes for an element with three given quantities: A, Z and mass difference in MeV

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mfb

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You can check the masses of the nuclides that would be produced from the different decay modes, and see if such a decay is possible.

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e.bar.goum

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http://www.vanderbilt.edu/AnS/physics/volker/p330b/add_lecture_materials/wkb/audi_2003_decay_modes.png

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i was taught too the equation of mass difference of calculating the difference between the initial and final masses of the nuclides, but in the question that i was given only one element was mentioned, i got confused over there. for eg mass difference of hydrogen(A=1,Z=1)= 7.289 MeV, mass difference of Nb(A=92, Z=41)= -86.448 MeV, mass difference of Rb(A=92, Z=37)=-75.12MeV

You can check the masses of the nuclides that would be produced from the different decay modes, and see if such a decay is possible.

Or can we just ignore the mass difference data and calculate the neutron-proton ratio and compare it to the valley of stability?

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mfb

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You can look it up, if necessary.i was taught too the equation of mass difference of calculating the difference between the initial and final masses of the nuclides, but in the question that i was given only one element was mentioned, i got confused over there.

To get a rough estimate, yes, but it won't work for every isotope.Or can we just ignore the mass difference data and calculate the neutron-proton ratio and compare it to the valley of stability?

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