Physics Paper Topics Posted on Thursday, September 10th Physics is the study of matter and energy as well as their interactions with one another.
Henri Becquerel Since s cloud chambers played an important role of particle Nuclear physics term paper and eventually lead to the discovery of positronmuon and kaon. The history of nuclear physics as a discipline distinct from atomic physics starts with the discovery of radioactivity by Henri Becquerel in Nuclear physics term paper,  while investigating phosphorescence in uranium salts.
Thomson  a year later was an indication that the atom had internal structure. At the beginning of the 20th century the accepted model of the atom was J. In the years that followed, radioactivity was extensively investigated, notably by Marie and Pierre Curie as well as by Ernest Rutherford and his collaborators.
By the turn of the century physicists had also discovered three types of radiation emanating from atoms, which they named alphabetaand gamma radiation. Experiments by Otto Hahn in and by James Chadwick in discovered that the beta decay spectrum was continuous rather than discrete.
That is, electrons were ejected from the atom with a continuous range of energies, rather than the discrete amounts of energy that were observed in gamma and alpha decays.
This was a problem for nuclear physics at the time, because it seemed to indicate that energy was not conserved in these decays. The Nobel Prize in Physics was awarded jointly to Becquerel for his discovery and to Marie and Pierre Curie for their subsequent research into radioactivity.
Rutherford was awarded the Nobel Prize in Chemistry in for his "investigations into the disintegration of the elements and the chemistry of radioactive substances". In Albert Einstein formulated the idea of mass—energy equivalence. While the work on radioactivity by Becquerel and Marie Curie predates this, an explanation of the source of the energy of radioactivity would have to wait for the discovery that the nucleus itself was composed of smaller constituents, the nucleons.
More work was published in by Geiger and Ernest Marsden and further greatly expanded work was published in by Geiger. The key experiment behind this announcement was performed in at the University of Manchester: The plum pudding model had predicted that the alpha particles should come out of the foil with their trajectories being at most slightly bent.
But Rutherford instructed his team to look for something that shocked him to observe: He likened it to firing a bullet at tissue paper and having it bounce off.
As an example, in this model which is not the modern one nitrogen consisted of a nucleus with 14 protons and 7 electrons 21 total particles and the nucleus was surrounded by 7 more orbiting electrons.
AroundArthur Eddington anticipated the discovery and mechanism of nuclear fusion processes in starsin his paper The Internal Constitution of the Stars.
This was a particularly remarkable development since at that time fusion and thermonuclear energy, and even that stars are largely composed of hydrogen see metallicityhad not yet been discovered. The Rutherford model worked quite well until studies of nuclear spin were carried out by Franco Rasetti at the California Institute of Technology in Rasetti discovered, however, that nitrogen had a spin of 1.
James Chadwick discovers the neutron[ edit ] Main article: With the discovery of the neutron, scientists could at last calculate what fraction of binding energy each nucleus had, by comparing the nuclear mass with that of the protons and neutrons which composed it.
Differences between nuclear masses were calculated in this way. In the Yukawa interaction a virtual particlelater called a mesonmediated a force between all nucleons, including protons and neutrons. This force explained why nuclei did not disintegrate under the influence of proton repulsion, and it also gave an explanation of why the attractive strong force had a more limited range than the electromagnetic repulsion between protons.
The center of the atom contains a tight ball of neutrons and protons, which is held together by the strong nuclear force, unless it is too large.
Physica Scripta, endorsed by The Royal Swedish Academy of Sciences, is an international journal dedicated to presenting novel and accessible research findings across the breadth of theoretical and experimental physics. OPEN FOR SUBMISSIONS. Submit an article. China's Nuclear Fuel Cycle (Updated November ) China has become self-sufficient in most aspects of the fuel cycle. China aims to produce one-third of its uranium domestically, obtain one-third through foreign equity in mines and joint ventures overseas, and to purchase one-third on the open market. by V.A. Uzikov, I.V. Uzikova. Read the whole article Download the ZIP file. Introduction Research reactors include a wide range of civil and commercial installations, which, as a rule, are not used for power generation.
Unstable nuclei may undergo alpha decay, in which they emit an energetic helium nucleus, or beta decay, in which they eject an electron or positron. After one of these decays the resultant nucleus may be left in an excited state, and in this case it decays to its ground state by emitting high energy photons gamma decay.
This research became the science of particle physicsthe crown jewel of which is the standard model of particle physics which describes the strong, weak, and electromagnetic forces.
Modern nuclear physics[ edit ] Main articles: Liquid-drop modelNuclear shell modeland Nuclear structure A heavy nucleus can contain hundreds of nucleons.
This means that with some approximation it can be treated as a classical systemrather than a quantum-mechanical one. In the resulting liquid-drop model the nucleus has an energy which arises partly from surface tension and partly from electrical repulsion of the protons.
The liquid-drop model is able to reproduce many features of nuclei, including the general trend of binding energy with respect to mass number, as well as the phenomenon of nuclear fission.We specialize in the integration of all transportation and logistics functions for top-tier companies around the world.
AGT Global Logistics can help improve customer service, accelerate order cycle time, and tighten control of the supply chain — all while reducing costs . Nuclear physics is the field of physics that studies atomic nuclei and their constituents and interactions.
Other forms of nuclear matter are also studied.  Nuclear physics should not be confused with atomic physics, which studies the atom as a whole, including its electrons. Plutonium is the second most common isotope, formed by neutron capture by Pu in about one-third of impacts.
Its concentration in nuclear fuel builds up steadily, since it does not undergo fission to produce energy in the same way as Pu by V.A. Uzikov, I.V. Uzikova. Read the whole article Download the ZIP file.
Introduction Research reactors include a wide range of civil and commercial installations, which, as a rule, are not used for power generation.
A Note on the PP Tables. Tables below outline the proton-proton fusion cycle as it occurs in all main sequence stars. Each table includes a time scale characteristic of the conditions found in our sun. Example Term Papers.
These are some of the better papers that have been handed in in past semesters. Note, however, that these papers are far from perfect.