Presentation is loading. Please wait.

Presentation is loading. Please wait.

Alpha Decay Contents: What it is Energy of radiation from mass defectEnergy of radiation from mass defect Whiteboard Why and how Tunneling.

Published byLora Lang Modified over 9 years ago

Similar presentations

Presentation on theme: "Alpha Decay Contents: What it is Energy of radiation from mass defectEnergy of radiation from mass defect Whiteboard Why and how Tunneling."— Presentation transcript:

1 Alpha Decay Contents: What it is Energy of radiation from mass defectEnergy of radiation from mass defect Whiteboard Why and how Tunneling

2 Alpha Decay - Energy of alpha particle TOC Calculating mass defect of alpha decay 92-U-232 -->90-Th-228 + Alpha 232.037131 -->228.028716 + 4.002602 (Appendix F, for Alpha = He 4) (#electrons?) 232.037131 --> 232.031318 (products have less mass) Mass defect = parent - products = 232.037131 - 232.031318 = 0.005813 u E k = (0.005813 u)(931.5 MeV/u) = 5.415 MeV (Less - daughter E k ) 1 u = 931.5 MeV He (neutral atom) = 4.002602 u

3 Whiteboards: Alpha Energy 11 | 22 TOC

4 W Parent mass = 247.07030 u Product mass = 243.061373 u + 4.002602 u = 247.063975 u Mass defect = parent - products = 0.006325 u Energy of radiation = (.006325 u)(931.5 MeV/u) = 5.892 MeV = (5.892 x10 6 eV)(1.602 x 10 -19 J/eV) = 9.439 x 10 -13 J 247 97 Bk --> 243 95 Am +  247.07030 -->243.061373+4.002602 What is energy of alpha? (in MeV and J) 5.892 MeV, 9.439 x 10 -13 J

5 W Parent mass = 243.061373 u Product mass = 239.052932 u + 4.002602 u = 243.055534 u Mass defect = parent - products = 0.005839 u Energy of radiation = (0.005839 u)(931.5 MeV/u ) = 5.439 MeV = (5.439 x10 6 eV)(1.602 x 10 -19 J/eV) = 8.713 x 10 -13 J E k = 1 / 2 mv 2, m = 6.64 x 10 -27 kg, E k = 8.713 x 10 -13 J v = 1.62 x 10 7 m/s 243 95 Am --> 239 93 Np +  243.061373 -->239.052932+4.002602 (It’s a decay series!!!) What is energy of alpha? (in MeV and J) What is the velocity of the alpha? (Assume? that the alpha gets all the kinetic energy) m  = 6.64x10 -27 kg 5.439 MeV, 8.713 x 10 -13 J, 1.62 x 10 7 m/s

6 Why Alpha Decay TOC Only possible if mass products < parent Tendency to reduce potential energy Larger nuclei He nucleus is rather tightly bound He Nucleus

7 Tunneling - Energy is not conserved! TOC Alpha shouldn’t escape (energy) Et > h/2Et > h/2 Violates COE (briefly) “Tunneling” Pure quantum randomness E k of alpha - observed Shape of curve Capture of Alpha: Repulsion - Coulombic Attraction - Strong Nuc. E k(Alpha) < E k(Capture)

Download ppt "Alpha Decay Contents: What it is Energy of radiation from mass defectEnergy of radiation from mass defect Whiteboard Why and how Tunneling."

Similar presentations

ConcepTest 30.1 The Nucleus

ConcepTest 30.1 The Nucleus
Binding energy in atoms and nuclei [Sec. 4.1 Dunlap]

Binding energy in atoms and nuclei [Sec. 4.1 Dunlap]
Nuclear Physics Lesson 13

Nuclear Physics Lesson 13
Nuclear Binding Energy

Nuclear Binding Energy
Chapter 30 Nuclear Physics

Chapter 30 Nuclear Physics
Nuclear Physics Nucleus: –nucleons (neutrons and protons) bound together. –Strong Force binds nucleons together over short range (~10 -15 m) –Nuclide:

Nuclear Physics Nucleus: –nucleons (neutrons and protons) bound together. –Strong Force binds nucleons together over short range (~ m) –Nuclide:
More About Decay Modes Nuclear Physics Lesson 9. Homework Revise for the skills test. Revise for the skills test. HWK days: HWK days: Tues Wk 1 Period.

More About Decay Modes Nuclear Physics Lesson 9. Homework Revise for the skills test. Revise for the skills test. HWK days: HWK days: Tues Wk 1 Period.
Finite Square Well Potential

Finite Square Well Potential
Energy Kinetic Energy: energy in the form of motion –Individual Motion (e.g., batted baseball) –Thermal Energy: energy of particles in random motion Potential.

Energy Kinetic Energy: energy in the form of motion –Individual Motion (e.g., batted baseball) –Thermal Energy: energy of particles in random motion Potential.
P460 - barriers1 Bound States and Tunneling V 0 0 State A will be bound with infinite lifetime. State B is bound but can decay to B->B’+X (unbound) with.

P460 - barriers1 Bound States and Tunneling V 0 0 State A will be bound with infinite lifetime. State B is bound but can decay to B->B’+X (unbound) with.
Radioactivity – types of decays presentation for April 28, 2008 by Dr. Brian Davies, WIU Physics Dept.

Radioactivity – types of decays presentation for April 28, 2008 by Dr. Brian Davies, WIU Physics Dept.
Radioactivity. Unstable  Some nuclei are unstable and give off radiation. Radioactivity - Bequerel 1896Radioactivity - Bequerel 1896 Three types observed:

Radioactivity. Unstable  Some nuclei are unstable and give off radiation. Radioactivity - Bequerel 1896Radioactivity - Bequerel 1896 Three types observed:
Nuclear Physics E = mc 2. Outline Theory of Special Relativity Postulates E = mc 2 The Atom What makes up the atom? What holds the atom together? Quantum.

Nuclear Physics E = mc 2. Outline Theory of Special Relativity Postulates E = mc 2 The Atom What makes up the atom? What holds the atom together? Quantum.
Lecture 10 Energy production. Summary We have now established three important equations: Hydrostatic equilibrium: Mass conservation: Equation of state:

Lecture 10 Energy production. Summary We have now established three important equations: Hydrostatic equilibrium: Mass conservation: Equation of state:
Universal Mass Unit The universal mass unit is used to describe the mass of an atom as 1/12 the mass of a carbon-12 atom. This is used because when you.

Universal Mass Unit The universal mass unit is used to describe the mass of an atom as 1/12 the mass of a carbon-12 atom. This is used because when you.
Nuclear Physics Developed by Mr. D. Patterson.

Nuclear Physics Developed by Mr. D. Patterson.
1 Chapter 31 Nuclear Physics and Radioactivity. 2 1. Nuclear Structure a)Proton - positive charge - mass 1.673 x 10 -27 kg ≈ 1 u b) Neutron - discovered.

1 Chapter 31 Nuclear Physics and Radioactivity Nuclear Structure a)Proton - positive charge - mass x kg ≈ 1 u b) Neutron - discovered.
Approximately how many radioactive atoms are present in a tritium sample with an activity of 0.4 x 10-6 Ci and a half-life of 12.3 years? (1 Ci = 3.7 x.

Approximately how many radioactive atoms are present in a tritium sample with an activity of 0.4 x 10-6 Ci and a half-life of 12.3 years? (1 Ci = 3.7 x.
1 Nuclear and Particle Physics. 2 Nuclear Physics Back to Rutherford and his discovery of the nucleus Also coined the term “proton” in 1920, and described.

1 Nuclear and Particle Physics. 2 Nuclear Physics Back to Rutherford and his discovery of the nucleus Also coined the term “proton” in 1920, and described.
Nuclear notation and Binding energy Contents: Atomic notation Isotopes Whiteboard Binding Energy AMU Making an atom Calculating binding energy Whiteboards.

Nuclear notation and Binding energy Contents: Atomic notation Isotopes Whiteboard Binding Energy AMU Making an atom Calculating binding energy Whiteboards.

Similar presentations

Ads by Google