BARRIER DISTRIBUTION OF QUASI-ELASTIC BACKWAD SCATTERING IN VERY HEAVY REACTION SYSTEMS

2010 ◽  
Vol 19 (05n06) ◽  
pp. 989-996
Author(s):  
S. MITSUOKA ◽  
H. IKEZOE ◽  
K. NISHIO ◽  
Y. WATANABE ◽  
S. C. JEONG ◽  
...  
Keyword(s):  
Cross Sections ◽  
Cold Fusion ◽  
Channel Calculation ◽  
Barrier Heights ◽  
Scattering Cross ◽  
Rutherford Scattering ◽  
Barrier Distribution ◽  
Coupled Channel Calculation ◽  
Coupled Channel ◽  
Scattering Cross Sections

We have measured quasi-elastic backward scattering in the reactions of 48 Ti , 54 Cr , 56 Fe , 64 Ni , 70 Zn , 76 Ge and 86 Kr + 208 Pb to study the nucleus-nucleus interaction in Pb -based cold fusion. The barrier distributions were obtained from the first derivative of the measured excitation functions of quasi-elastic scattering cross sections normalized to the Rutherford scattering cross sections. The centroids of the barrier distributions showed deviations from several predicted barrier heights toward the low energy side except for the Christensen-Winther potential and the Aküz-Winther potential. The shapes of the barrier distributions were well reproduced by the results of a coupled-channel calculation taking account of the coupling effects of multi-phonon excitations of the quadrupole vibration for the projectiles and of the octupole vibration for the 208 Pb target. The present barrier distributions were also well reproduced by a semiclassical calculation taking into account the couplings of transfer channels and single-phonon excitations in the projectiles and the target.

scholarly journals Large-amplitude quadrupole shape mixing probed by the $(p,p^\prime)$ reaction: A model analysis

2019 ◽  
Vol 2019 (10) ◽  
Author(s):  
Koichi Sato ◽  
Takenori Furumoto ◽  
Yuma Kikuchi ◽  
Kazuyuki Ogata ◽  
Yukinori Sakuragi
Keyword(s):  
Cross Sections ◽  
Large Amplitude ◽  
Model Parameters ◽  
Channel Calculation ◽  
Prolate Shape ◽  
Coupled Channel Calculation ◽  
Transition Densities ◽  
A Chain ◽  
Coupled Channel ◽  
Shape Phase Transition

Abstract To discuss a possible observation of large-amplitude nuclear shape mixing by nuclear reaction, we employ a simple collective model and evaluate the transition densities with which the differential cross sections are obtained through the microscopic coupled-channel calculation. Assuming the spherical-to-prolate shape transition, we focus on large-amplitude shape mixing associated with the softness of the collective potential in the $\beta$ direction. We introduce a simple model based on the five-dimensional quadrupole collective Hamiltonian, which simulates a chain of isotopes that exhibit spherical-to-prolate shape phase transition. Taking $^{154}$Sm as an example and controlling the model parameters, we study how the large-amplitude shape mixing affects the elastic and inelastic proton scatterings. The calculated results suggest that the inelastic cross section of the $2_2^+$ state shows us the important role of the quadrupole shape mixing.

Ion Beam Analysis of O, N, and B Compositions in Materials Using Non-Rutherford Scattering of Protons

1988 ◽  
Vol 128 ◽  
Author(s):  
N. R. Parikh ◽  
Z. H. Zhang ◽  
M. L. Swanson ◽  
N. Yu ◽  
W. K. Chu
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Ion Beam ◽  
Proton Scattering ◽  
Light Elements ◽  
Ion Scattering ◽  
Scattering Cross ◽  
Beam Analysis ◽  
Rutherford Scattering ◽  
Scattering Cross Sections

ABSTRACTElastic scattering of protons with energies from 1.5 MeV to 2 MeV was used to determine the concentration of oxygen in Y-Ba-Cu-O compound, nitrogen in GaN films, and boron in B-Si glass and other materials. Proton scattering from light elements in this energy range exhibits non-Rutherford scattering cross section, which are enhanced by a factor of 3 to 6 or more relative to the Rutherford scattering cross sections. Thus the sensitivity for the light clement detection is considerably larger than that obtained by He ion scattering.Quantitative analysis by proton scattering is discussed and compared with other methods.

scholarly journals Elastic backscattering measurments for 6,7Li+58Ni, 6,7Li+116,120Sn, 6,7Li+208Pb at near barrier energies

2019 ◽  
Vol 18 ◽  
pp. 201
Author(s):  
K. Zerva ◽  
... Et al.
Keyword(s):  
Elastic Scattering ◽  
Recent Work ◽  
Cross Sections ◽  
Reaction Mechanisms ◽  
Weakly Bound ◽  
Excitation Functions ◽  
Scattering Cross ◽  
Rutherford Scattering ◽  
Elastic Backscattering ◽  
Scattering Cross Sections

We have performed, elastic backscattering measurements for the weakly bound nuclei 6,7Li on the medium and heavy mass targets 58Ni, 116,120Sn, 208Pb at sub- and near-barrier energies (0.6 to 1.3 EC.b.). Excitation functions of elastic scattering cross sections have been measured at 160O and 170O and the corresponding ratios to Rutherford scattering and relevant barrier distributions have been extracted. These measurements will complement recent work on a 28Si target for probing the potential at sub- and near barrier energies and relevant reaction mechanisms.

scholarly journals “Column-By-Column” Compositional Mapping At Semiconductor Interfaces Using Z-Contrast Stem

1990 ◽  
Vol 183 ◽  
Author(s):  
D. E. Jesson ◽  
S. J. Pennycook ◽  
J. -M. Baribeau
Keyword(s):  
Cross Sections ◽  
Atomic Resolution ◽  
Scattering Cross ◽  
Semiconductor Interfaces ◽  
Reconstructed Surfaces ◽  
Rutherford Scattering ◽  
New Strategy ◽  
Compositional Information ◽  
Z Contrast ◽  
Scattering Cross Sections

AbstractA new strategy for atomic resolution compositional mapping at semiconductor interfaces is presented. Images can be interpreted directly to within 10% to give column-by-column compositional information with a sensitivity approaching Rutherford scattering cross sections. We apply the method to obtain the first atomic resolution images of interfacial ordering in ultrathin (SimGen)p superlattices and attribute the results to growth on (2 × 1) and (1 × 2) reconstructed surfaces.

scholarly journals Microscopic coupled-channel calculation of proton and alpha inelastic scattering to the 41+ and 42+ states of 24Mg

2021 ◽  
Author(s):  
Yoshiko Kanada-En'yo ◽  
Kazuyuki Ogata
Keyword(s):  
Inelastic Scattering ◽  
Cross Sections ◽  
Angular Distributions ◽  
Channel Calculation ◽  
Triaxial Deformation ◽  
Step Process ◽  
Coupled Channel Calculation ◽  
One Step ◽  
Coupled Channel ◽  
Α Particles

Abstract The triaxial and hexadecapole deformations of the Kπ = 0+ and Kπ = 2+ bands of 24Mg have been investigated by the inelastic scatterings of various probes, including electrons, protons, and alpha(α) particles, for a prolonged time. However, it has been challenging to explain the unique properties of the scatterings observed for the 41+ state through reaction calculations. This paper investigates the structure and transition properties of the Kπ = 0+ and Kπ = 2+ bands of 24Mg employing the microscopic structure and reaction calculations via inelastic proton and α scattering. In particular, the E4 transitions to the 41+ and 42+ states are reexamined. The structure of 24Mg was calculated employing the variation after the parity and total angular momentum projections in the framework of the antisymmetrized molecular dynamics (AMD). The inelastic proton and α reactions were calculated by the microscopic coupled-channel (MCC) approach by folding the Melbourne g-matrix NN interaction with the AMD densities of 24Mg. Reasonable results were obtained on the properties of the structure, including the energy spectra and E2 and E4 transitions of the Kπ = 0+ and Kπ = 2+ bands owing to the enhanced collectivity of triaxial deformation. The MCC+AMD calculation successfully reproduced the angular distributions of the 41+ and 42+ cross sections of proton scattering at incident energies of Ep = 40–100MeV and α scattering at Eα = 100–400 MeV. This is the first microscopic calculation to describe the unique properties of the 01+ → 41+ transition. In the inelastic scattering to the 41+ state, the dominant two-step process of the 01+→ 21+→ 41+ transitions and the deconstructive interference in the weak one-step process were essential.

Effect of Surface Diffuseness Parameter on Quasi-elastic Scattering Calculations for 16O+208Pb,63Cu Systems

2021 ◽  
Vol 19 (10) ◽  
pp. 100-105
Author(s):  
Nagham H. Hayef ◽  
Khalid S. Jassim
Keyword(s):  
Relative Motion ◽  
Cross Sections ◽  
Single Channel ◽  
Nuclear Potential ◽  
Channel Calculation ◽  
Coupled Channels ◽  
Coupled Channel Calculation ◽  
Surface Diffuseness ◽  
Diffuseness Parameter ◽  
Coupled Channel

A systematic study on the surface characteristic of the nucleus-nucleus potential for some heavy-ion. The nuclear potential has been described by using Woods-Saxon (WS), the single-channel (SC) and the coupled-channels (CC) calculations, which were between the relative motion of the colliding nuclei and their intrinsic motions, were conducted to study its influence on calculation, the ratio of the quasi-elastic to the Rutherford cross sections and probe the surface diffuseness method was used to find the best fitted value of the diffuseness parameters in comparison with the experimental data. We find that the best fitted value of the diffuseness parameter which obtained through a coupled-channel calculation with inert target and excited projectile forIn the current work, the single-channel (SC) and the coupled-channels (CC) calculations, which were between the relative motion of the colliding nuclei and their intrinsic motions, were conducted to study its influence on calculation, the ratio of the quasi-elastic to the Rutherford cross sections and probe the surface diffuseness find that the best fitted value of the diffuseness parameter which obtained through a coupled-channel calculation with excited target and projectile excited also inert projectile-excited target for the 16O+208Pb andexcited projectile and inert target for the 16O+63Cu.

Excitations of rotational energy levels of ozone molecule O3 by collisions with atoms of the noble gases (Ar and He)

2021 ◽  
pp. 162-170
Author(s):  
O.V. Egorov ◽  
◽  
A.K. Tretyakov ◽  
◽  
Keyword(s):  
Cross Sections ◽  
Collision Energy ◽  
Noble Gases ◽  
Energy Levels ◽  
Rotational Energy ◽  
Rate Coefficients ◽  
Rotational States ◽  
Scattering Cross ◽  
Coupled Channel ◽  
Scattering Cross Sections

The scattering cross-sections on rotational energy levels of O3 by collisions with atoms of the noble gases (Ar and He) were calculated using the two-body scheme implemented in the MOLSCAT2020 package. All energy levels of O3 up to J max = K max = 5 and J max = K max = 7 were included that corresponds to 18 and 32 coupled channel equations. The dependences of the scattering cross-sections on the collision energy were analyzed and the most probable excited rotational states of O3 were determined. The rate coefficients at the temperatures of 5-300 K were calculated. The construction of the radial part of the angular coefficients of the interaction potential is also discussed.

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