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**Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).**

Coulomb Scattering Elastic or inelastic. Elastic Rutherford scattering. At any distance: V = 0 Ta = ½mvo2 l = mvob vmin vo rmin b d Accelerator Physics, JU, First Semester, (Saed Dababneh). No dependence on

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**Coulomb Scattering Closest approach “d”. E = ECoulomb d = 2kZe2/E**

What about the recoil nucleus? HW 9 Show that where mN : mass of the nucleus m : mass of alpha What are the values of d for 10, 20, 30 and 40 MeV on Au? How does this explain … ? Nuclear and Radiation Physics, BAU, Second Semester, (Saed Dababneh).

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**Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).**

Coulomb Scattering Accelerator Physics, JU, First Semester, (Saed Dababneh).

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**Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).**

Coulomb Scattering b < b > db d n target nuclei / cm3 x target thickness (thin). nx target nuclei / cm2 HW 10 Show that and hence b Rutherford cross section Accelerator Physics, JU, First Semester, (Saed Dababneh).

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**Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).**

Coulomb Scattering Study Fig (a,b,c,d) in Krane See also Fig in Krane. HW 11 Show that the fraction of incident alpha particles scattered at backward angles from a 2 m gold foil is 7.48x10-5. Accelerator Physics, JU, First Semester, (Saed Dababneh).

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**Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).**

Coulomb Scattering RBS – Channeling. Ion implantation. Occupational or substitutional impurities. Accelerator Physics, JU, First Semester, (Saed Dababneh).

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**Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).**

Coulomb Scattering Elastic Rutherford scattering. Inelastic Coulomb excitation. See the corresponding alpha spectrum of Fig in Krane. Accelerator Physics, JU, First Semester, (Saed Dababneh).

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**Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).**

Coulomb Scattering Accelerator Physics, JU, First Semester, (Saed Dababneh).

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**Principles of Spectrometry**

Interaction of heavy charged particles Electronic or nuclear (Rutherford, nuclear reactions, …) or radiative (Bremsstrahlung). ? Al in Al Excitation Ionization ion-pair, suppress recombination in detectors. Energy loss SRIM Depletion layer. Delta rays and secondary electrons. Electron suppression for charge integration in accelerators. Faraday Cup. Tracks. Detectors mainly designed to make use of electronic interactions. Accelerator Physics, JU, First Semester, (Saed Dababneh).

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**Principles of Spectrometry**

Stopping power Bethe-Bloch formula ~1/E ~1/E Minimum ionizing particles (mip). Accelerator Physics, JU, First Semester, (Saed Dababneh).

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**Principles of Spectrometry**

Units (conversion) You will encounter this when you run SRIM eV / Å keV / m MeV / mm keV / (g/cm2) MeV / (mg/cm2) keV / (mg/cm2) eV / (1x1015 atoms/cm2) Accelerator Physics, JU, First Semester, (Saed Dababneh).

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**Principles of Spectrometry**

What about fission fragments????? Energy loss is a stochastic process, thus energy straggling. Accelerated beam ~1/E Electron pick-up. Target Bragg curve Accelerator Physics, JU, First Semester, (Saed Dababneh).

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**Accelerator Physics, JU, First Semester, 2010-2011 (Saed Dababneh).**

Hadrontherapy Accelerator Physics, JU, First Semester, (Saed Dababneh).

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Chapter 5 Interactions of Ionizing Radiation. Ionization The process by which a neutral atom acquires a positive or a negative charge Directly ionizing.

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