Coulomb barrier


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Coulomb barrier

[′kü‚läm ‚bar·ē·ər]
(nuclear physics)
The Coulomb repulsion which tends to keep positively charged bombarding particles out of the nucleus.
Specifically, the Coulomb potential associated with this force.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The main challenge is to overcome the Coulomb barrier: deuterons have a charge equal to the charge on the proton, and they repel each other with a force given by
Overcoming the Coulomb barrier between the two deuterons in this process usually requires a high momentum and therefore temperatures in excess of 100 MK which are thought to only be possible in gravitationally-confined systems such as the Sun or magnetically-confined fusion reactors.
A physicist by the name of (https://en.wikipedia.org/wiki/George_Gamow) George Gamow  then produced a formalism for describing alpha decay using quantum tunneling (first noted by (https://en.wikipedia.org/wiki/Friedrich_Hund) Friedrich Hund )- which allowed atoms to cross the classically impenetrable Coulomb barrier.
Because of the Coulomb barrier due to the electric repulsion between nuclei (potential (6)), most of these collisions are elastic, but sometimes tunneling through the barrier can occur and bring a dark nucleus F into the region of the potential well present at smaller distance, due to the exchange of [sigma] and S between F and the nuclei of the detector (potential (7)).
where [I.sub.c] is the critical current of a Josephson junction in the 2D array, [k.sub.B] is the Boltzmann constant, T is the absolute temperature, and [[DELTA].sub.c] is the collective Coulomb barrier of the array.
The first theoretical enigma I faced was the necessity of overcoming the Coulomb barrier between two deuterons (deuterium nuclei).
An upgrade to ISAC-II to give higher accelerated radioactive beam energies to get above the coulomb barrier for reactions is in progress and will be ready in 2006 for the first experiments.
Deuterium and cesium nuclei, both positively charged, mutually repel, the so-called Coulomb barrier. Only with extreme temperature and or pressure should fusion be possible, overcoming the Coulomb barrier until the nuclear strong force fuses the particles together.
No one could figure out how they had overcome the Coulomb barrier (the repulsive electromagnetic force), and if they had, how they survived the trillions of neutrons that should have been radiated.
Instead of focusing on experimental data (in the area in which F&P were recognized authorities) most critics focused on the disagreements with the coulomb barrier theory.
What lowers the coulomb barrier, between the atomic nuclei of hydrogen and nickel?
In this context, the main objective of this study is to look for the effect of the overlap between the Coulomb barriers on the activation energy.