Semistatistical model forC12+12C reaction cross sections below the Coulomb barrier

1990 ◽  
Vol 42 (4) ◽  
pp. 1768-1771 ◽  
Author(s):  
Sohail A. Khan ◽  
William P. Beres
Keyword(s):  
Cross Sections ◽  
Coulomb Barrier ◽  
Reaction Cross ◽  
Reaction Cross Sections

scholarly journals 7Be and 8B reaction dynamics at Coulomb barrier energies

2018 ◽  
Vol 184 ◽  
pp. 02015
Author(s):  
E. Strano ◽  
M. Mazzocco ◽  
A. Boiano ◽  
C. Boiano ◽  
M. La Commara ◽  
...  
Keyword(s):  
Cross Sections ◽  
Coulomb Barrier ◽  
Reaction Cross Section ◽  
Optical Model ◽  
Reaction Dynamics ◽  
Reaction Cross ◽  
Total Reaction Cross Section ◽  
Weakly Bound ◽  
Total Reaction ◽  
Reaction Cross Sections

We investigated the reaction dynamics induced by the 7Be,8B+208Pb collisions at energies around the Coulomb barrier. Charged particles originated by both the col- lisions were detected by means of 6 ΔE-Eres telescopes of a newly developed detector array. Experimental data were analysed within the framework of the Optical Model and the total reaction cross-sections were compared together and with the 6,7Li+208Pb colli-sion data. According to the preliminary results, 7Be nucleus reactivity is rather similar to the 7Li one whereas the 8B+208Pb total reaction cross section appears to be much larger than those measured for reactions induced by the other weakly-bound projectiles on the same target.

COULOMB BARRIER TRANSMISSION RESONANCE FOR ASTROPHYSICAL PROBLEMS

1993 ◽  
Vol 07 (24n25) ◽  
pp. 1627-1631 ◽  
Author(s):  
YEONG E. KIM ◽  
ALEXANDER L. ZUBAREV
Keyword(s):  
Transmission Coefficient ◽  
Cross Sections ◽  
Coulomb Barrier ◽  
Charged Particles ◽  
Separation Distance ◽  
Reaction Cross ◽  
Nuclear Surface ◽  
Transmission Resonance ◽  
Low Energies ◽  
Reaction Cross Sections

In estimating the nonresonance nuclear reaction cross sections σ(E) at low energies (≲20 keV) needed for astrophysical calculations, it is customary to extrapolate higher energy (≳20 keV) data for σ(E) to low energies using the Gamow transmission coefficient representing the probability of bringing two charged particles to zero separation distance, which is unphysical and unrealistic since the Coulomb barrier does not exist inside the nuclear surface. We present a general extrapolation method based on a more realistic barrier transmission coefficient, which can accommodate simultaneously both nonresonance and resonance contributions.

Reaction cross sections forB8,Be7, andLi6+Ni58near the Coulomb barrier: Proton-halo effects

2009 ◽  
Vol 79 (2) ◽  
Author(s):  
E. F. Aguilera ◽  
E. Martinez-Quiroz ◽  
D. Lizcano ◽  
A. Gómez-Camacho ◽  
J. J. Kolata ◽  
...  
Keyword(s):  
Cross Sections ◽  
Coulomb Barrier ◽  
Reaction Cross ◽  
Halo Effects ◽  
Reaction Cross Sections ◽  
Proton Halo

scholarly journals A 4π γ-summing method for cross-section measurements of capture reactions

2020 ◽  
Vol 15 ◽  
pp. 111
Author(s):  
A. Spyrou ◽  
H.-W. Becker ◽  
A. Lagoyannis ◽  
S. Harissopulos ◽  
C. Rolfs
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Large Volume ◽  
Coulomb Barrier ◽  
Reaction Cross Section ◽  
High Efficiency ◽  
Reaction Cross ◽  
Capture Reaction ◽  
Stellar Nucleosynthesis ◽  
Reaction Cross Sections

Capture reaction cross sections at energies far below the Coulomb barrier are of major importance for the understanding of stellar nucleosynthesis. Since the cross sections of the majority of these reactions are very small, the use of high efficiency detectors is essential. In this work, a new method for capture reaction cross section measurements based on a large volume 4π NaI detector is presented.

STRUCTURE EFFECTS IN COLLISIONS INDUCED BY HALO AND WEAKLY BOUND NUCLEI AROUND THE COULOMB BARRIER

2010 ◽  
Vol 19 (05n06) ◽  
pp. 1236-1240 ◽  
Author(s):  
V. SCUDERI ◽  
A. DI PIETRO ◽  
L. ACOSTA ◽  
F. AMORINI ◽  
M. J. G. BORGE ◽  
...  
Keyword(s):  
Cross Sections ◽  
Coulomb Barrier ◽  
Center Of Mass ◽  
Reaction Cross ◽  
Angular Distributions ◽  
Weakly Bound ◽  
Model Calculations ◽  
Center Of Mass Energy ◽  
Reaction Channels ◽  
Reaction Cross Sections

In this contribution, results concerning different reaction channels for the collisions induced by the three Be isotopes, 9,10,11 Be , on a 64 Zn target at energies around the Coulomb barrier will be presented. The experiments with the radioactive 10,11 Be beams were performed at REX-ISOLDE (CERN) whereas the experiment with the stable weakly bound 9 Be beam was performed at LNS Catania. Elastic scattering angular distributions have been measured for the three systems 9,10,11 Be + 64 Zn at the same center of mass energy. The angular distributions were analyzed with optical potentials and reaction cross sections were obtained from optical model calculations, performed with the code PTOLEMY. For the 11 Be + 64 Zn reaction, the break-up angular distribution was also measured.

Formation of α clusters in dilute neutron-rich matter

Science ◽  
2021 ◽  
Vol 371 (6526) ◽  
pp. 260-264 ◽  
Author(s):  
Junki Tanaka ◽  
Zaihong Yang ◽  
Stefan Typel ◽  
Satoshi Adachi ◽  
Shiwei Bai ◽  
...  
Keyword(s):  
Cross Sections ◽  
Cluster Formation ◽  
Reaction Cross ◽  
Skin Thickness ◽  
Neutron Skin ◽  
Heavy Nuclei ◽  
Α Decay ◽  
Neutron Skin Thickness ◽  
Reaction Cross Sections ◽  
Α Particles

The surface of neutron-rich heavy nuclei, with a neutron skin created by excess neutrons, provides an important terrestrial model system to study dilute neutron-rich matter. By using quasi-free α cluster–knockout reactions, we obtained direct experimental evidence for the formation of α clusters at the surface of neutron-rich tin isotopes. The observed monotonous decrease of the reaction cross sections with increasing mass number, in excellent agreement with the theoretical prediction, implies a tight interplay between α-cluster formation and the neutron skin. This result, in turn, calls for a revision of the correlation between the neutron-skin thickness and the density dependence of the symmetry energy, which is essential for understanding neutron stars. Our result also provides a natural explanation for the origin of α particles in α decay.

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