31 October: Supernovae and Neutron Stars
... Formation of a neutron star from stellar core • As core collapses, matter becomes compressed • Electrons and protons forced together e+p > n + nu (neutronization) • Core of the becomes a neutron fluid • Neutronization produces a burst of neutrinos • Neutron fluid in core becomes degenerate and rigi ...
... Formation of a neutron star from stellar core • As core collapses, matter becomes compressed • Electrons and protons forced together e+p > n + nu (neutronization) • Core of the becomes a neutron fluid • Neutronization produces a burst of neutrinos • Neutron fluid in core becomes degenerate and rigi ...
Chapter 44 Problems
... maximum speed of the protons ejected was found to be 3.3 × 107 m/s. Because the velocity of the neutrons could not be determined directly, a second experiment was performed using neutrons from the same source and nitrogen nuclei as the target. The maximum recoil speed of the nitrogen nuclei was fou ...
... maximum speed of the protons ejected was found to be 3.3 × 107 m/s. Because the velocity of the neutrons could not be determined directly, a second experiment was performed using neutrons from the same source and nitrogen nuclei as the target. The maximum recoil speed of the nitrogen nuclei was fou ...
Chapter 11 The Nucleus
... Thus, ES=-a2A2/3. The - sign is because this is a reduction in the binding energy. The Coulomb energy. Protons repel each other. The Coulomb repulsion is proportional to 1/R, or 1/A1/3. In a nucleus with Z protons, there are a total of Z(Z-1)/2 pairs of protons. (If you don't believe that, try it wi ...
... Thus, ES=-a2A2/3. The - sign is because this is a reduction in the binding energy. The Coulomb energy. Protons repel each other. The Coulomb repulsion is proportional to 1/R, or 1/A1/3. In a nucleus with Z protons, there are a total of Z(Z-1)/2 pairs of protons. (If you don't believe that, try it wi ...
PracticeSolutions - Phenix at Vanderbilt
... not. (c) To release energy from a Uranium nucleus, would you use fission or fusion? Explain using the nuclear binding energy curve. Uranium nuclei are on the right of the peak in the binding energy-pernucleon curve. Thus, if we use fusion, we’ll make a bigger nucleus which will be less tightly bound ...
... not. (c) To release energy from a Uranium nucleus, would you use fission or fusion? Explain using the nuclear binding energy curve. Uranium nuclei are on the right of the peak in the binding energy-pernucleon curve. Thus, if we use fusion, we’ll make a bigger nucleus which will be less tightly bound ...
Principles of Technology
... All atomic nuclei (nuclides) and their component nucleons may be represented by the same general symbol: The letter X represents the letter(s) used to identify the particle; the letter Z, representing the atomic number, indicates the number of elementary charges present (assumed to be positive unles ...
... All atomic nuclei (nuclides) and their component nucleons may be represented by the same general symbol: The letter X represents the letter(s) used to identify the particle; the letter Z, representing the atomic number, indicates the number of elementary charges present (assumed to be positive unles ...
1.4 Whiteboard Review!
... An organism contained 200 grams of Carbon-14 when it died. After 17,190 years, only 25 grams remain. How long is Carbon-14’s half-life? Find how many half-lives have passed. ...
... An organism contained 200 grams of Carbon-14 when it died. After 17,190 years, only 25 grams remain. How long is Carbon-14’s half-life? Find how many half-lives have passed. ...
Spring 2010
... galaxies from dwarfs to giants, from starbursts to quasars; dark matter and the large-scale structure of the universe; Einstein's special and general theory of relativity, black holes, worm holes, time travel, and big bang cosmology. This course is designed for the non-science major and has no prere ...
... galaxies from dwarfs to giants, from starbursts to quasars; dark matter and the large-scale structure of the universe; Einstein's special and general theory of relativity, black holes, worm holes, time travel, and big bang cosmology. This course is designed for the non-science major and has no prere ...
6.3 Nuclear Reactions
... after binding may be fractionally small. • For systems with high binding energies, however, the missing mass may be an easily measurable fraction. ...
... after binding may be fractionally small. • For systems with high binding energies, however, the missing mass may be an easily measurable fraction. ...
Modern Physics MC Practice Answers
... leaving 214X82 … then in the two beta decays, a neutron turns into a proton each time increasing the atomic number by two leaving … 214X84. ...
... leaving 214X82 … then in the two beta decays, a neutron turns into a proton each time increasing the atomic number by two leaving … 214X84. ...
Chemistry study guide 09
... 1. Atoms of the same element with a different number of neutrons 2. This different number f neutrons gives those atoms different Atomic masses 3. the Atomic mass of an element is based on the averages of its Isotopes. ...
... 1. Atoms of the same element with a different number of neutrons 2. This different number f neutrons gives those atoms different Atomic masses 3. the Atomic mass of an element is based on the averages of its Isotopes. ...
Fundamental Physics With Cold and Ultra-cold
... [Fr. Physique Fondamental, c. 1975, first used to describe a variety of interdisciplinary research activities carried out at the high flux reactor of the Institut Laue Langevin, ...
... [Fr. Physique Fondamental, c. 1975, first used to describe a variety of interdisciplinary research activities carried out at the high flux reactor of the Institut Laue Langevin, ...
do physics online from quanta to quarks radioactivity
... momentum, Austrian physicist Wolfgang Pauli in 1930 proposed that a neutral particle was emitted along with the particle. This particle would have no charge and zero rest mass (hence, travel at the speed of light) but would possess spin, energy and momentum. For each beta emission, the total energ ...
... momentum, Austrian physicist Wolfgang Pauli in 1930 proposed that a neutral particle was emitted along with the particle. This particle would have no charge and zero rest mass (hence, travel at the speed of light) but would possess spin, energy and momentum. For each beta emission, the total energ ...
Worksheet 2.1 - contentextra
... decreasing frequency, γ rays, X-rays, UV radiation, visible light, IR radiation, microwaves, and radio waves. (See Table 3 of the IB Data booklet). Electron Negatively charged particle present in all atoms and located in orbitals outside the nucleus. The relative mass of the electron is 5 × 10–4. El ...
... decreasing frequency, γ rays, X-rays, UV radiation, visible light, IR radiation, microwaves, and radio waves. (See Table 3 of the IB Data booklet). Electron Negatively charged particle present in all atoms and located in orbitals outside the nucleus. The relative mass of the electron is 5 × 10–4. El ...
Document
... Alpha Decay in a Smoke Detector Alpha particles from a weak source collide with air molecules and ionize them, which allows a current to flow between the plates. In the presence of smoke, ions colliding with smoke are generally neutralized (i.e. neutral atoms are formed), so that the current decreas ...
... Alpha Decay in a Smoke Detector Alpha particles from a weak source collide with air molecules and ionize them, which allows a current to flow between the plates. In the presence of smoke, ions colliding with smoke are generally neutralized (i.e. neutral atoms are formed), so that the current decreas ...
Nuclear models: The liquid drop model Fermi
... This average kinetic energy has a minimum at N = Z for fixed mass number A (but varying N or, equivalently, Z). Hence the binding energy gets maximal for N = Z. If we expand (5) in the difference N − Z we obtain ...
... This average kinetic energy has a minimum at N = Z for fixed mass number A (but varying N or, equivalently, Z). Hence the binding energy gets maximal for N = Z. If we expand (5) in the difference N − Z we obtain ...
Nuclear drip line
In nuclear physics, the boundaries for nuclear particle-stability are called drip lines. Atomic nuclei contain both protons and neutrons—the number of protons defines the identity of that element (ie, carbon always has 6 protons), but the number of neutrons within that element may vary (carbon-12 and its isotope carbon-13, for example). The number of isotopes each element may have is visually represented by plotting boxes, each of which represents a unique nuclear species, on a graph with the number of neutrons increasing on the abscissa (X axis) and number of protons increasing along the ordinate (Y axis). The resulting chart is commonly referred to as the table of nuclides, and is to nuclear physics what the periodic table of the elements is to chemistry.An arbitrary combination of protons and neutrons does not necessarily yield a stable nucleus. One can think of moving up and/or to the right across the nuclear chart by adding one type of nucleon (i.e. a proton or neutron, both called nucleons) to a given nucleus. However, adding nucleons one at a time to a given nucleus will eventually lead to a newly formed nucleus that immediately decays by emitting a proton (or neutron). Colloquially speaking, the nucleon has 'leaked' or 'dripped' out of the nucleus, hence giving rise to the term ""drip line"". Drip lines are defined for protons, neutrons, and alpha particles, and these all play important roles in nuclear physics. The nucleon drip lines are at the extreme of the proton-to-neutron ratio: at p:n ratios at or beyond the driplines, no stable nuclei can exist. The location of the neutron drip line is not well known for most of the nuclear chart, whereas the proton and alpha driplines have been measured for a wide range of elements. The nucleons drip out of such unstable nuclei for the same reason that water drips from a leaking faucet: in the water case, there is a lower potential available that is great enough to overcome surface tension and so produces a droplet; in the case of nuclei, the emission of a particle from a nucleus, against the strong nuclear force, leaves the total potential of the nucleus and the emitted particle in a lower state. Because nucleons are quantized, only integer values are plotted on the table of isotopes; this indicates that the drip line is not linear but instead looks like a step function up close.