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02. Radiation physics - RPOP- IAEA
02. Radiation physics - RPOP- IAEA

... The different natural elements ranging from hydrogen to uranium are built of increasing numbers of nucleons. The hydrogen nucleus has one proton and the uranium nucleus has 92 protons and 146 neutrons. It is the number of protons and hence the number of electrons that define the element and its chem ...
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... that this is slightly less than the mass of a proton or a neutron. An atomic mass unit is sometimes called a Dalton (D). 1.00 g = 6.02214 x 1023 amu. This number is also known as Avogadro’s Number and it defines the size of a quantity we call a mole. ...
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QCD and Nuclei

... “Hadronic Freedom” VM implies that near the phase transition (PT) approaching from below, hadronic interactions become very weak Assume between the PT point and the “flash point” (at which hadrons become strongly interacting), hadrons flow “freely” with little interaction Brown Rule (after Bethe): ...
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... quantities • Energy transitions occur in jumps of discrete amounts of energy • Electrons only lose energy when they move to a lower energy state ...
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Semester 1 Final Review Powerpoint

... • The nucleus is located in the center of an atom. • The nucleus is positively charged and its volume is a very small % of the atom’s volume. • The nucleus contains protons and neutrons (they do not have to be equal in number). • The nuclear components are held together by the nuclear strong force. ...
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... the number of neutrons in a nucleus.  The higher the atomic number, the larger the neutron:proton ratio must be in order to remain stable  Difference of +/- 1 neutron can result in an unstable nucleus ...
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... may be left in an excited (higher -energy) state. Gamma rays are more penetrating than either alpha or beta radiation, bu t less ionising. Gamma rays from nuclear fallout would probably cause the largest number of casualties in the event of the use of nuclear weapons in a nuclear ...
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Physics 9 Fall 2009 - faculty.ucmerced.edu

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From electrons to quarks - FSU High Energy Physics

... between two media with different speeds of light (different “refractive index”), e.m. radiation is emitted -- “transition radiation”  amount of radiation grows with (energy/mass); bremsstrahlung (= braking radiation) (e.m. int.):  when charged particle's velocity changes, e.m. radiation is emitted ...
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The Atom`s Ancestry s Ancestry

... The electron has a mass of about 9.1093897 × 10–28 grams. The mass of a proton or a neutron is about 1,836 times more than the electron. The mass of proton is 1.67 × 10–24 grams and the charge of the proton and electron is ± 1.602 × 10–19 coulomb. Neutron has no charge and it is slightly more massiv ...
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Chapter 13 Spectroscopy NMR, IR, MS, UV-Vis

... the same average environment. The oxygen pulls electrons away from the right methyl and it is deshielded from the applied field, shifted downfield, a smaller field is needed to bring it into resonance. Three kinds of carbon. Note how deshielded the carbonyl carbon is. Look at the chemical shift rang ...
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Atomic nucleus



The nucleus is the small, dense region consisting of protons and neutrons at the center of an atom. The atomic nucleus was discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment. After the discovery of the neutron in 1932, models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko and Werner Heisenberg. Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the electron cloud. Protons and neutrons are bound together to form a nucleus by the nuclear force.The diameter of the nucleus is in the range of 6985175000000000000♠1.75 fm (6985175000000000000♠1.75×10−15 m) for hydrogen (the diameter of a single proton) to about 6986150000000000000♠15 fm for the heaviest atoms, such as uranium. These dimensions are much smaller than the diameter of the atom itself (nucleus + electron cloud), by a factor of about 23,000 (uranium) to about 145,000 (hydrogen).The branch of physics concerned with the study and understanding of the atomic nucleus, including its composition and the forces which bind it together, is called nuclear physics.
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