Nuclear Physics Chapter 25. 3 Li lithium 6.941 1 name symbol atomic number (# of p + ) average atomic mass electrons in outer energy level.

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Presentation transcript:

Nuclear Physics Chapter 25

3 Li lithium name symbol atomic number (# of p + ) average atomic mass electrons in outer energy level

Protons positive charge made of two up quarks and a down quark Electric charge +2/3 eElectric charge -1/3 e in the nucleus… Neutrons made of two down quarks and an up quark

Li 7 = proton = neutron number of nucleons (mass number) Li 6 an isotope of Li mass number talks about 1 atom atomic mass is an average of all atoms

Mass is usually expressed in amu or u 1 amu = 1/12 th the mass of a carbon 12 atom 1 amu = 1.66 x kg= mass of p + or n 0 an n 0 is actually about 5 x u more massive an e - has a mass of about 5 x u…hmmm

Mass can also be expressed in MeV/c 2 rest energy (E 0 ) = MeV Mega (1 x 10 6 ) electron volt (1.60 x J) 1 proton = MeV/c 2

mass number atomic number (charge)

The electric force between protons is repulsive There must be a force stronger than the electric force holding the nucleus together

The Strong Force is the force that holds nucleons together. It is independent of charge, it binds neutrons and protons. It only works over very small distances (atomic).

m r nucleus = (1.2x m )A 1/3 where A is the atomic number

Stable “big” atoms have more neutrons than protons, because the electric force acts over greater distances.

Nucleons bound together in a nucleus have less mass (energy) than unbound nucleons E bind =  mc 2 binding energy is that energy that holds the nucleus together mass defect the difference in mass

Find the total binding energy of Al 27 if it has a mass of u. H 1 has a mass of u and the mass of a n 0 is u. There are MeV/u. Al is atomic # 13, so it has 13( u) of p + and e -, = u. Al has 14 n 0 = 14( u) = u  m = ( ) u – u = u x MeV/u= 225 MeV

Nuclear Decay Alpha Decay: an  particle (He nucleus) escapes the strong force by quantum tunneling. The nucleus loses 2 p + and 2 n 0.

Beta decay: the weak force causes an up quark to change into a down quark, or vice versa. This causes a proton to change into a neutron or vice versa. neutronprotonelectron  - antineutrino

protonneutronpositron  + neutrino A thallium 208 nucleus emits a  - particle (an electron). Write the equation.

Gamma Decay: a nucleon can be in an excited state, needing to get rid of energy to reach a stable energy level. The nucleon emits a photon, but the structure of the nucleus stays the same.