neutron cross section वाक्य
उदाहरण वाक्य
मोबाइल
- The predecessor group to the NNDC was founded in 1951 when a group known as the Brookhaven Neutron Cross Section Compilation Group was formed at the Brookhaven National Laboratory.
- 1967 saw the two groups merge into the National Neutron Cross Section Center ( NNCSC ), with Dr . Sol Pearlstein as acting director, officially being appointed Director of the NNCSC in 1968.
- However, this simple model does not take into account so called neutron resonances, which strongly modify neutron cross section in energy range of 1 eV 10 keV, nor threshold energy of some nuclear reactions.
- On the other hand, for very high energy neutrons ( over 1 MeV ), \ lambda can be neglected, and neutron cross section is approximately constant, determined just by cross section of atomic nuclei.
- The isotopes neptunium-235,-236, and-237 are predicted to be fissile; Calculated values of the critical masses of neptunium-235,-236, and-237 respectively are 66.2 kg, 6.79 kg, and 63.6 kg : the neptunium-236 value is even lower than that of plutonium-239 . In particular 236 Np also has a low neutron cross section.
- Even though the thermal neutron cross section of 6 Li is low compared to 3 He ( 940 barns vs . 5330 barns ), the atom density of 6 Li in the fiber is fifty times greater, resulting in an advantage in effective capture density ratio of approximately 10 : 1.
- The Chart of the Nuclides, containing information such as masses, relative abundances, half-lives, neutron cross sections, and decay properties for more than 3, 100 nuclides and 580 isomers was developed at KAPL . This chart is a necessity for students and professionals in nuclear physics, chemistry, engineering, and medicine around the world.
- Although U-238 will not undergo fission by the neutrons released in fission, thermal neutrons can be captured by the nucleus to transmute the atom into Pu-239 . Pu-239 has a neutron cross section very similar to that of U-235, and most of the atoms created this way will undergo fission from the thermal neutrons.
- Walter Zinn did not want a woman involved in the dirty work of placing the graphite blocks, but Woods had plenty of work to do with the detectors and thermocouples, and used a small stack of graphite of her own to measure the effects of a radium-beryllium source on manganese foil to obtain a measure of the neutron cross section in order to calibrate the detectors.
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