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mass excess

The mass exess is the measured mass of a nucleus - A(the number of
nucleons) in energy units. There are fairly complex theoretical formulae
that predict this number and have a standard deviation of less than an MeV
over the measured range of nuclei.

My reference is OLD: Introduction to Nuclear Physics, Harald Enge,1966.
At one time in my life (many years ago) I was in the business(game) of
measuring masses and hence mass excesses.

----------
From: Bob Muir
To: teachers physics
Subject: chart of nuclides
Date: Thursday, April 18, 1996 10:48 AM

This question probably has a simple answer, but I haven't been able to
find one in any of my nuclear physics texts.

I've been using the info from the following url:

"http://necs01.dne.bnl.gov/CoN/index.html";>Chart of the Nuclides

For each element, there is reported an "Excess Mass", e.g.,
tritium: 14949 keV
helium 4: 2425 keV
carbon 14: 3029 keV
carbon 12: 0
Iron 56: -60601 keV

What IS excess mass? Maybe its supposed to be obvious, but I've got a
bad cold and maybe my brain is mush today.


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