scholarly journals Attempts to detect the emission of secondary charged particles in the fission of 235 U by slow neutrons

1947 ◽  
Vol 191 (1027) ◽  
pp. 428-441 ◽  
Keyword(s):  
Thin Film ◽  
Charged Particle ◽  
Uranium Oxide ◽  
Charged Particles ◽  
The Other ◽  
Light Charged Particle ◽  
Fission Fragments ◽  
The Mean ◽  
Light Charged Particles ◽  
Α Particles

If light charged particles (protons, α-particles, etc.) are emitted during fission, it should be possible to establish this fact by a simple coincidence experiment. Suppose two detectors are arranged so that they can both ‘see’ a thin film of uranium oxide. Let one of the detectors register the entry of fission fragments only, say at the rate of F (sec. -1 ). Let the other detector register not only fission fragments (unless they are excluded by an interposed absorber) but also light charged particles (protons, a-particles, etc.) with energies within certain limits. Suppose that the rate of registration in the second detector is P (sec. -1 ), that the mean efficiency for the detection of a light charged particle emitted from the uranium film is e , and that the average number of light charged particles liberated per fission is η.

scholarly journals A SEMI-CLASSICAL ANALYSIS OF THE PROTON SEQUENTIAL EMISSION IN 16O+58Ni DEEP INELASTIC COLLISIONS

2005 ◽  
Vol 14 (02) ◽  
pp. 239-254
Author(s):  
L. AUDITORE ◽  
R. BARNÁ ◽  
D. DE PASQUALE ◽  
A. ITALIANO ◽  
A. TRIFIRÓ ◽  
...  
Keyword(s):  
Charged Particles ◽  
Inelastic Collisions ◽  
Classical Analysis ◽  
Fan Effect ◽  
Decay Times ◽  
Inelastic Reaction ◽  
Polarization Phenomena ◽  
Deep Inelastic Reaction ◽  
Light Charged Particles ◽  
Α Particles

We study the 16 O +58 Ni deep inelastic reaction by using coincident charged techniques. Inclusive as well as exclusive data of the C , N , and O fully-damped fragments and their associated light charged particles ( p , d , t , and α-particles) have been collected at the IReS Strasbourg VIVITRON Tandem facility. The velocity distributions of the emitted protons and the associated multiplicity polar plots are analyzed by means of a model which describes simultaneously the nonequilibrium and the evaporative (equilibrated) components of a deep inelastic reaction mechanism. Estimates on polarization phenomena as well as the associated "decay times" of the reaction have been obtained. The hypothesis of a new "fan effect" is proposed for the proton sequential emission in the deep inelastic scattering of 16 O +58 Ni at 8.25 MeV/nucleon.

NECK FRAGMENTATION IN FISSION AND QUASIFISSION OF HEAVY AND SUPERHEAVY NUCLEI

2009 ◽  
Vol 18 (04) ◽  
pp. 830-840 ◽  
Author(s):  
V. A. RUBCHENYA ◽  
W. H. TRZASKA ◽  
E. VARDACI
Keyword(s):  
Heavy Ion ◽  
Ternary Fission ◽  
Light Charged Particle ◽  
Dinuclear System ◽  
Mass Distributions ◽  
Heavy And Superheavy Nuclei ◽  
Light Charged Particle Emission ◽  
Light Charged Particles ◽  
Charged Particle Emission ◽  
Α Particles

The generalized approach is proposed for the ternary fission and the neck fragmentation of the dinuclear system formed in the heavy ion quasifission reactions. The light-charged-particles accompanied the fission and quasifission are the valuable probes for studies of the dynamics of the hyperdeformed nuclear configurations with neck. The developed model describes well the light-charged-particle emission probabilities and their mass distributions in the ternary fission of actinide nuclei. The model is also applied to analyze the double differential distributions of the protons and α-particles accompanied fragmentation in the reaction 86 Kr + 206 Pb at E Kr = 500 and 600 MeV. It was found that the near scission emission multiplicities of α-particles are [Formula: see text] and 0.070 ± 0.005 at lower and higher energies, respectively. The neck emission of the protons was not detected.

Orbits of magnetized charged particles in parabolic and inverse electrostatic potentials

2016 ◽  
Vol 82 (1) ◽  
Author(s):  
P. M. Bellan
Keyword(s):  
Magnetic Field ◽  
Angular Momentum ◽  
Charged Particle ◽  
Penning Trap ◽  
Axial Magnetic Field ◽  
Charged Particles ◽  
Analytic Solutions ◽  
The Other ◽  
Particle Orbit ◽  
Slow Frequency

Analytic solutions are presented for the orbit of a charged particle in the combination of a uniform axial magnetic field and parabolic electrostatic potential. These trajectories are shown to correspond to the sum of two individually rotating vectors with one vector rotating at a constant fast frequency and the other rotating in the same sense but with a constant slow frequency. These solutions are related to Penning trap orbits and to stochastic orbits. If the lengths of the two rotating vectors are identical, the particle has zero canonical angular momentum in which case the particle orbit will traverse the origin. If the potential has an inverse dependence on distance from the source of the potential, the particle can impact the source. Axis-encircling orbits are where the length of the vector associated with the fast frequency is longer than the vector associated with the slow frequency. Non-axis-encircling orbits are the other way around.

28.—Simultaneous Emission of two Light Charged Particles in Fission

1974 ◽  
Vol 71 (4) ◽  
pp. 323-331 ◽  
Author(s):  
N. Feather
Keyword(s):  
Ground State ◽  
Charged Particles ◽  
The Other ◽  
Ternary Fission ◽  
Simultaneous Emission ◽  
Quaternary Fission ◽  
Light Particles ◽  
Light Charged Particles ◽  
Unstable States

SynopsisThe suggestion is made that in certain cases the light particles emitted in ternary fission may be released otherwise than in the ground state—and, in particular, that low-lying particle-unstable states may be involved. This suggestion is examined quantitatively in respect of the release of 8Be in the first excited short-lived state of 2·9 MeV excitation, and is shown to provide a satisfactory interpretation of the observation of quaternary fission in the α,α mode recently reported by Kataria et al. (1973). It appears probable that the other modes of quaternary fission observed by these authors should be similarly interpreted.

ENERGY LOSS OF HIGHLY CHARGED PARTICLES PRODUCED BY FISSION AND BY COSMIC RAYS: SECTION I. OBSERVATIONS OF FISSION FRAGMENTS

1953 ◽  
Vol 31 (1) ◽  
pp. 78-96 ◽  
Author(s):  
Pierre Demers
Keyword(s):  
Cosmic Rays ◽  
Energy Loss ◽  
Charged Particles ◽  
Velocity Curve ◽  
The Other ◽  
Stopping Power ◽  
Light Fragment ◽  
Fission Fragments

Measurements on the range of the tracks of fission fragments recorded in special laboratory-made emulsions are reported. The origin was marked so that observations on length not possible otherwise were made. Stopping power and straggling for such tracks in different media are discussed. It is shown, that the range of one fragment is little dependent on the range of the other paired fragment. The blackening of the two tracks near the origin is on the average unequal, that of the light fragment L being darker. It is inferred that ionization is greater near the origin for the L fragment. Knock-on protons allow a range velocity curve to be drawn, and evidence is advanced to prove that the light associated particles are indeed knock-on protons.

Correlations between fission fragments and light charged-particles in the reaction20Ne+197Au at 13 MeV/nucleon

1982 ◽  
Vol 307 (4) ◽  
pp. 365-373 ◽  
Author(s):  
M. F. Rivet ◽  
B. Gatty ◽  
H. Guillemot ◽  
B. Borderie ◽  
R. Bimbot ◽  
...  
Keyword(s):  
Charged Particles ◽  
Fission Fragments ◽  
Light Charged Particles
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