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### On the Role of Up & Down Quarks in Understanding Nuclear Binding Energy (Part I)

#### Abstract

In a paper published in 2010, the authors proposed that, up quark mass is *m _{u}* = 4.4 MeV/

*c*

^{2}and down quark mass is

*m*= 9.473 MeV/

_{d}*c*

^{2}and their mass ratio is 0.4645. By considering the harmonic mean of up and down quarks, a new mass unit of 6.0 MeV/

*c*

^{2}can be defined. It is suggested that, when

*A*>

*A*, nuclear binding energy is close to

_{stable}*k*(

*A*+

*Z*) 6.0 MeV where

*k*= 0.74 to 1 and seems to be connected with

*Z*. When

*A*<

*A*nuclear binding energy is close to

_{stable}*k*(

*A*+

*Z - δ*) 6.0 MeV where

*δ*is a number which seems to be connected with (

*Z, A, A*).

_{stable}