Scattering of α-particles by 11B nuclei at an energy of 40MeV and role of the exchange mechanism with transfer of 7Li

2018 ◽  
Vol 27 (11) ◽  
pp. 1850094
Author(s):  
N. Burtebayev ◽  
Maulen Nassurlla ◽  
Marzhan Nassurlla ◽  
N. Saduyev ◽  
A. Sabidolda ◽  
...  
Keyword(s):  
Deformation Parameter ◽  
Quadrupole Deformation ◽  
Collective Model ◽  
Negative Sign ◽  
Exchange Mechanism ◽  
Angular Distributions ◽  
Coupled Channels ◽  
Quadrupole Deformation Parameter ◽  
Α Particles

The elastic and inelastic scatterings of [Formula: see text]-particles were investigated at an energy of 40[Formula: see text]MeV with excitation of low-lying states of the [Formula: see text]B nucleus [0.0 (3/2[Formula: see text]), 4.445 (5/2[Formula: see text]), 6.74 (7/2[Formula: see text]), 2.125 (1/2[Formula: see text]) and 5.02[Formula: see text]MeV (3/2[Formula: see text])]. The analysis of the experimental angular distributions was carried out via the coupled channels method within the framework of the collective model. The value of the quadrupole deformation parameter [Formula: see text] was extracted. Calculations indicate a preference for a negative sign for deformation. It is shown that the exchange mechanism with the transfer of the heavy 7Li cluster does not play an important role in the scattering of [Formula: see text]-particles on [Formula: see text]B nuclei at an energy of 40[Formula: see text]MeV.

scholarly journals GROUND STATE PROPERTIES AND BUBBLE STRUCTURE OF SYNTHESIZED SUPERHEAVY NUCLEI

2013 ◽  
Vol 22 (01) ◽  
pp. 1350001 ◽  
Author(s):  
S. K. SINGH ◽  
M. IKRAM ◽  
S. K. PATRA
Keyword(s):  
Binding Energy ◽  
Ground State ◽  
Deformation Parameter ◽  
Mean Field ◽  
Quadrupole Deformation ◽  
Superheavy Nuclei ◽  
Ground State Properties ◽  
Quadrupole Deformation Parameter ◽  
Bubble Structure ◽  
The Stability

We calculate the ground state properties of recently synthesized superheavy elements (SHEs) from Z = 105–118 along with the predicted proton magic Z = 120. The relativistic and nonrelativistic mean field formalisms are used to evaluate the binding energy (BE), charge radius, quadrupole deformation parameter and the density distribution of nucleons. We analyzed the stability of the nuclei based on BE and neutron to proton ratio. We also studied the bubble structure which reveals the special features of the superheavy nuclei.

Scattering of α-particles and 3He on 16O nuclei and its excitation mechanism at energies near 50MeV

2017 ◽  
Vol 26 (04) ◽  
pp. 1750018 ◽  
Author(s):  
N. Burtebayev ◽  
A. Duysebayev ◽  
B. A. Duysebayev ◽  
J. Burtebayeva ◽  
M. Nassurlla ◽  
...  
Keyword(s):  
Inelastic Scattering ◽  
Good Description ◽  
Center Of Mass ◽  
Angular Distributions ◽  
Octupole Deformation ◽  
Coupled Channels ◽  
Cluster Transfer ◽  
Microscopic Models ◽  
Nuclear Rainbow ◽  
Α Particles

Elastic and inelastic scattering of [Formula: see text]-particles at 48.1[Formula: see text]MeV and 3He at 60[Formula: see text]MeV on [Formula: see text]O nuclei has been measured with excitation of states at 6.05 (0[Formula: see text])–6.13 (3[Formula: see text])[Formula: see text]MeV, 6.92 (2[Formula: see text])–7.12 (1[Formula: see text])[Formula: see text]MeV and 8.87 (2[Formula: see text])[Formula: see text]MeV. The center-of-mass beam momenta are the same for these two strongly absorbed particles. Analysis of angular distributions was performed in the frameworks of the optical model, the coupled channels method and the Distorted Wave Born Approximation (DWBA). A good description of experimental data was obtained over the full angular range without taking into account the spin-orbit interaction and the cluster transfer mechanism with real potentials that have volume integrals of about 400[Formula: see text]MeV fm3. Collective and microscopic models were used in the analysis of the inelastic scattering. The values of the octupole deformation lengths were extracted. It is shown that nuclear rainbow effects appear not only in the elastic, but also in the inelastic scattering with excitation of the 3[Formula: see text] state of [Formula: see text]O.

CLUSTER STRUCTURES IN 28Si

2009 ◽  
Vol 24 (11) ◽  
pp. 2069-2075
Author(s):  
YASUTAKA TANIGUCHI ◽  
YOSHIKO KANADA-EN'YO ◽  
MASAAKI KIMURA
Keyword(s):  
Molecular Dynamics ◽  
Deformation Parameter ◽  
Cluster Structure ◽  
Quadrupole Deformation ◽  
Wave Functions ◽  
Positive Parity ◽  
Energy Variation ◽  
Quadrupole Deformation Parameter ◽  
Configuration Mixing

Positive-parity states of 28 Si are studied with antisymmetrized molecular dynamics and multi-configuration mixing focusing on clustering and deformations. By superposition of wave functions obtained by energy variation imposing constraints on quadrupole deformation parameter β and distance between α and 24 Mg , and 12 C and 16 O clusters, two oblate bands, two prolate bands and developed α-24 Mg band are obtained. It is found that cluster structure components are contained in those bands.

A technique for measuring the quadrupole deformation parameter of transuranium nuclei

2008 ◽  
Vol 51 (5) ◽  
pp. 661-664
Author(s):  
D. A. Testov ◽  
A. A. Aleksandrov ◽  
Yu. P. Gangrskii ◽  
V. I. Zhemenik ◽  
G. V. Myshinskii ◽  
...  
Keyword(s):  
Deformation Parameter ◽  
Quadrupole Deformation ◽  
Quadrupole Deformation Parameter

CLUSTERING CORRELATIONS AND TRIAXIALITY IN THE sd-SHELL REGION

2011 ◽  
Vol 20 (04) ◽  
pp. 1046-1049 ◽  
Author(s):  
YASUTAKA TANIGUCHI ◽  
MASAAKI KIMURA ◽  
YOSHIKO KANADA-EN'YO ◽  
HISASHI HORIUCHI
Keyword(s):  
Excited States ◽  
Deformation Parameter ◽  
Cluster Structure ◽  
Quadrupole Deformation ◽  
Generator Coordinate Method ◽  
Generator Coordinate ◽  
Cluster Distance ◽  
Quadrupole Deformation Parameter ◽  
Different Shapes ◽  
Shell Region

Effects of cluster correlations on triaxiality have been studied using the antisymmetrized molecular dynamics. Low-lying states in 28 Si and 40 Ca are obtained by the the generator coordinate method (GCM), and the GCM basis are calculated by energy variations with constraints on quadrupole deformation parameter β and inter-cluster distance. The GCM obtain prolate superdeformed (SD) states in 28 Si and triaxial normal-deformed (ND) states in 40 Ca , which contain prolate α-24 Mg and triaxial α-36 Ar cluster structure components, respectively. Different shapes of prolate 24 Mg and oblate 36 Ar clusters cause difference of triaxiality of total systems. Cluster correlations which have oblate cluster enhance triaxiality in excited states.

Role of the Electron–Dipole Interaction in Photodetachment Angular Distributions

2021 ◽  
pp. 10086-10092
Author(s):  
C. Annie Hart ◽  
Justin Lyle ◽  
Joseph Spellberg ◽  
Anna I. Krylov ◽  
Richard Mabbs
Keyword(s):  
Dipole Interaction ◽  
Angular Distributions

The role of transmembrane sodium gradient in rabbit ileal smooth muscle: Utilization of harmaline

1985 ◽  
Vol 5 (8) ◽  
pp. 667-671 ◽  
Author(s):  
M. S. Suleiman
Keyword(s):  
Smooth Muscle ◽  
Contractile Response ◽  
Sodium Concentration ◽  
Exchange Mechanism ◽  
Dependent Manner ◽  
Sodium Gradient ◽  
Extracellular Sodium ◽  
Dose Dependent

Decreasing extracellular sodium concentration was found to produce a contractile response of rabbit ileal smooth muscle. As the concentration decreases, the amplitude of contraction increases, thus producing a dose-dependent curve. Harmaline, a competitor for sodium, was found to inhibit the sodium gradient-dependent contractions in a dose-dependent manner. The results are interpreted as harmaline inhibiting a Na–Ca exchange mechanism present in ileal smooth muscle.

Angular distributions of fast α-particles emitted from the 159Tb + 95 MeV 14N reaction

1976 ◽  
pp. 475-475
Author(s):  
K. Hiruta ◽  
T. Inamura ◽  
S. Ise ◽  
M. Ishihara ◽  
T. Shimoda
Keyword(s):  
Angular Distributions ◽  
Α Particles

Electronic and optical properties of π-bridged perylenediimide derivatives: the role of π-bridges

2019 ◽  
Vol 7 (20) ◽  
pp. 12532-12537 ◽  
Author(s):  
Yuan Guo ◽  
Guangchao Han ◽  
Zeyi Tu ◽  
Yuanping Yi
Keyword(s):  
Electron Transfer ◽  
Optical Properties ◽  
Exchange Mechanism ◽  
Intramolecular Electron Transfer ◽  
Electronic And Optical Properties

For the π-bridged multi-PDI derivatives, intramolecular electron transfer is dictated by the super-exchange mechanism and can be greatly tuned by the π-bridge modes.

scholarly journals Excitation of the Ground-State Rotational Band in 28Si by Inelastic Scattering of 25.25 MeV Polarized Protons

1973 ◽  
Vol 51 (12) ◽  
pp. 1293-1299 ◽  
Author(s):  
R. de Swiniarski ◽  
H. E. Conzett ◽  
C. R. Lamontagne ◽  
B. Frois ◽  
R. J. Slobodrian
Keyword(s):  
Inelastic Scattering ◽  
Cross Sections ◽  
Ground State ◽  
Optical Potential ◽  
Great Sensitivity ◽  
Angular Distributions ◽  
Rotational Model ◽  
Coupled Channels ◽  
Polarized Protons ◽  
State Band

Angular distributions of the analyzing power and cross sections have been measured for the elastic and inelastic scattering of 25.25 MeV protons exciting the K = 0+ ground-state band in 28Si. Good agreement with experiment is obtained in the coupled-channels formalism on the basis of the rotational model with a quadrupole deformation β2 = −0.40 (oblate) and a hexadecapole deformation β4 = +0.15. The calculations show the great sensitivity of the experimental results to both the magnitude and sign of the quadrupole and hexadecapole deformations. Equivalent fits of the data were obtained either by keeping the deformation length of the various deformed terms of the optical potential constant (δ0 = β0R0 = βIRI = βLSRLS) or by increasing the deformation of the spin–orbit optical potential relative to the central potential by a factor of 1.5 (βLS = 1.5βcent).

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