scholarly journals Cross Section for Compound-Nucleus Formation in Heavy-Ion-Induced Reactions

1959 ◽  
Vol 116 (3) ◽  
pp. 703-712 ◽  
Author(s):  
T. Darrah Thomas
Keyword(s):  
Cross Section ◽  
Compound Nucleus ◽  
Heavy Ion ◽  
Nucleus Formation ◽  
Compound Nucleus Formation

COMPOUND NUCLEUS FORMATION IN NITROGEN–OXYGEN AND OXYGEN–OXYGEN REACTIONS

1962 ◽  
Vol 40 (1) ◽  
pp. 139-149
Author(s):  
W. A. Cartledge
Keyword(s):  
Cross Section ◽  
Compound Nucleus ◽  
Center Of Mass ◽  
Branching Ratio ◽  
Nuclear Interaction ◽  
Experimental Cross Section ◽  
Interaction Radius ◽  
Nucleus Formation ◽  
Experimental Cross ◽  
Compound Nucleus Formation

The experimental cross section for the reaction O16(N14,2p)Al28 is compared with the predictions of the square-well model of compound nucleus formation over the range 6.3 to 12 Mev (center of mass energy). The branching ratio is estimated from the experimental cross section for the comparison reaction Si29(p,2p)Al28 over the same range of excitation in the compound nucleus P30*. It is found that the branching ratio probably increases from about 10% to 20%, which requires the nuclear interaction radius for N14 + O16 to decrease from about 8.5 to 7.5 fermis as the energy is increased over this range.Because of the similarity in mass and observed charge distributions in N14 and O16, the interaction radius for compound nucleus formation in a collision between two oxygen nuclei is probably also similar and in the range 8.0 to 9.1 fermis at energies far below the Coulomb barrier. A consequence of this result is that oxygen ions, which may be present in the cores of sufficiently developed red giant stars, will be destroyed by O16 + O16 collisions in about 105 years and 1 year respectively, at temperatures in the vicinity of 13.0 and 18.5 × 108 °K.

Dynamical hindrance to compound-nucleus formation in heavy-ion reactions

1986 ◽  
Vol 459 (1) ◽  
pp. 145-172 ◽  
Author(s):  
J.P. Blocki ◽  
H. Feldmeier ◽  
W.J. Swiatecki
Keyword(s):  
Compound Nucleus ◽  
Heavy Ion ◽  
Heavy Ion Reactions ◽  
Nucleus Formation ◽  
Compound Nucleus Formation

scholarly journals Multiband coupling and nuclear softness in optical model calculations for even-even and odd-A actinides

2020 ◽  
Vol 239 ◽  
pp. 03003
Author(s):  
Dmitry Martyanov ◽  
Efrem Soukhovitskiĩ ◽  
Roberto Capote ◽  
José M. Quesada ◽  
Satoshi Chiba
Keyword(s):  
Cross Section ◽  
Compound Nucleus ◽  
Optical Model ◽  
Incident Neutron ◽  
Model Calculations ◽  
Formation Cross Section ◽  
Nucleus Formation ◽  
Coupled Channels ◽  
Compound Nucleus Formation ◽  
The Impact

A new dispersive multiband coupled channels optical model with soft-rotator “effective” deformations is proposed to describe nucleon scattering on even-even and odd-A actinides. The impact of the introduction of axial and non-axial dynamical deformations that describe nuclear softness is discussed. Softness and multiband coupling are shown to change compound-nucleus formation cross section by up to ≈ 10% for incident neutron energies below 1 MeV.

Dynamical thresholds for compound-nucleus formation in symmetric heavy-ion reactions

1983 ◽  
Vol 28 (2) ◽  
pp. 679-691 ◽  
Author(s):  
K. Thomas ◽  
R. Davies ◽  
Arnold J. Sierk ◽  
J. Rayford Nix
Keyword(s):  
Compound Nucleus ◽  
Heavy Ion ◽  
Heavy Ion Reactions ◽  
Nucleus Formation ◽  
Compound Nucleus Formation

scholarly journals Ein einfaches Modell zum Vergleich der Theorien von Hauser-Feshbach und P. A. Moldauer

1968 ◽  
Vol 23 (7) ◽  
pp. 955-961
Author(s):  
F. Schmidt
Keyword(s):  
Elastic Scattering ◽  
Cross Section ◽  
Compound Nucleus ◽  
Cross Sections ◽  
Channel Model ◽  
Open Channels ◽  
Nucleus Formation ◽  
Compound Nucleus Formation ◽  
The Cross

We discuss and compare the theories of HAUSER and FESHBACH and P. A. MOLDAUER by a simple two channel model. It is found that after a good fit of parameters only the cross sections of compound-elastic scattering differ substantially. Most differences appear if there are a few open channels. The consequences for the cross section of compound nucleus formation and also for calculations by the evaporation mdel are considered. By our model an evident foundation is given for the statement that MOLDAUER'S theorie would be valid for 〈Γλc〉/D ≦ 1.

scholarly journals Entrance-channel mass-asymmetry dependence of compound nucleus formation time in light heavy-ion reactions

1996 ◽  
Vol 54 (6) ◽  
pp. 3290-3293 ◽  
Author(s):  
A. Szanto de Toledo ◽  
B. V. Carlson ◽  
C. Beck ◽  
M. Thoennessen
Keyword(s):  
Compound Nucleus ◽  
Heavy Ion ◽  
Formation Time ◽  
Entrance Channel ◽  
Heavy Ion Reactions ◽  
Nucleus Formation ◽  
Mass Asymmetry ◽  
Compound Nucleus Formation

Compound nucleus formation in the 14N + 16O system

1977 ◽  
Vol 38 (10) ◽  
pp. 1179-1183 ◽  
Author(s):  
C. Volant ◽  
M. Conjeaud ◽  
S. Harar ◽  
E.F. Da Silveira
Keyword(s):  
Compound Nucleus ◽  
Nucleus Formation ◽  
Compound Nucleus Formation
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