scholarly journals Few-nucleon system dynamics studied via deuteron-deuteron collisions at 160 MeV

2020 ◽  
Author(s):  
Izabela Ciepał ◽  
Kazimierz Bodek ◽  
Nasser Kalantar Nayestanaki ◽  
Ghanshyambhai Khatri ◽  
Stanisław Kistryn ◽  
...  
Keyword(s):  
Cross Sections ◽  
Theoretical Calculations ◽  
Deuteron Beam ◽  
Proton Transfer Reaction ◽  
Nucleon Nucleon ◽  
P Wave ◽  
Nucleon Force ◽  
Nuclear Dynamics ◽  
Intermediate Energies ◽  
Three Body

Four nucleon scattering at intermediate energies provides unique opportunities to study effects of the two key ingredients of the nuclear dynamics, the nucleon-nucleon P-wave (NNP-wave) and the three-nucleon force (3NF). This is possible only with systematic and precise data, in conjunction with exact theoretical calculations. Using the BINA detector at KVI Groningen, the Netherlands, a rich set of differential cross section of the ^{2}2H(d,dp)n breakup reaction at 160 MeV deuteron beam energy has been measured. Besides the three-body breakup, also cross sections of the ^{2}2H(d, ^{3}3He)n proton transfer reaction have been obtained. The data are compared to the recent calculations for the three-cluster breakup.

scholarly journals Comprehensive measurements of cross sections and spin observables of the three-body break-up channel in deuteron-deuteron scattering at 65 MeV/nucleon

2020 ◽  
Vol 56 (9) ◽  
Author(s):  
R. Ramazani-Sharifabadi ◽  
H. R. Amir-Ahmadi ◽  
M. T. Bayat ◽  
A. Deltuva ◽  
M. Eslami-Kalantari ◽  
...  
Keyword(s):  
Cross Sections ◽  
Detection System ◽  
Theoretical Calculations ◽  
Deuteron Beam ◽  
Single Scattering ◽  
Analyzing Powers ◽  
Systematic Uncertainties ◽  
Scattering Approximation ◽  
Break Up ◽  
Three Body

Abstract Detailed measurements of five-fold differential cross sections and a rich set of vector and tensor analyzing powers of the $$^{2}\mathrm{H}({\varvec{d}},dp){n}$$ 2 H ( d , d p ) n break-up process using polarized deuteron-beam energy of 65 MeV/nucleon with a liquid-deuterium target are presented. The experiment was conducted at the AGOR facility at KVI using the BINA 4$$\pi $$ π -detection system. We discuss the analysis procedure including a thorough study of the systematic uncertainties. The results can be used to examine upcoming state-of-the-art calculations in the four-nucleon scattering domain, and will, thereby, provide further insights into the dynamics of three- and four-nucleon forces in few-nucleon systems. The results of coplanar configurations are compared with the results of recent theoretical calculations based on the Single-Scattering Approximation (SSA). Through these comparisons, the validity of SSA approximation is investigated in the Quasi-Free (QF) region.

scholarly journals Polarization Observables in Few-Nucleon Scattering

2016 ◽  
Vol 40 ◽  
pp. 1660072 ◽  
Author(s):  
St. Kistryn ◽  
E. Stephan
Keyword(s):  
Theoretical Calculations ◽  
Experimental Studies ◽  
Correlation Coefficients ◽  
Spin Correlation ◽  
Nucleon Nucleon ◽  
Transfer Coefficients ◽  
Nucleon Force ◽  
Analyzing Powers ◽  
Intermediate Energies ◽  
Polarization Transfer Coefficients

Systems composed of a few nucleons are subject of experimental studies for many years with the aim to gain precise information on the interaction between nucleons. Intermediate energies, below the threshold for pion production, deserve special attention: it is a region where comparison with exact theoretical calculations is possible, while the sensitivity to various aspects of interaction, like subtle effects of the dynamics beyond the pairwise nucleon-nucleon force, is significant. In addition to differential cross section, the observables related to nuclear polarization are studied, like vector and tensor analyzing powers, spin-correlation coefficients or polarization transfer coefficients. A brief survey of results of recent studies in few-nucleon systems is given.

Nuclear mean free paths and transparency at intermediate energies

1983 ◽  
Vol 61 (4) ◽  
pp. 750-753 ◽  
Author(s):  
Paul J. Karol
Keyword(s):  
Cross Sections ◽  
Nucleon Nucleon ◽  
Reaction Cross ◽  
Uniform Density ◽  
Nucleon Interaction ◽  
Density Distributions ◽  
Intermediate Energies ◽  
Soft Spheres ◽  
Nucleon Nucleon Interaction ◽  
Reaction Cross Sections

The soft-spheres model of nuclear reaction cross sections incorporating tapered density distributions is used to evaluate nucleon mean free paths and transparencies at intermediate energies. Comparison with similar calculations employing uniform density distributions shows the latter to give misleading results that nevertheless have been used in recent years as evidence that the physics of the nucleon–nucleon interaction within nuclei is incompletely understood.

scholarly journals NUCLEAR MEAN-FIELD DESCRIPTION OF PROTON ELASTIC SCATTERING BY 12,13 C AT LOW ENERGIES

2020 ◽  
Vol 31 (1) ◽  
Author(s):  
Huan Nhut Phan
Keyword(s):  
Elastic Scattering ◽  
Cross Sections ◽  
Nuclear Reactions ◽  
Mean Field ◽  
Nuclear Astrophysics ◽  
Nucleon Nucleon ◽  
Light Nuclei ◽  
Intermediate Energies ◽  
Proton Elastic Scattering ◽  
Low Energies

Nuclear reactions of proton by light nuclei at low energies play a key role in the study ofnucleosynthesis which is of interest in nuclear astrophysics. The most fundamental process whichis very necessary is the elastic scattering. In this work, we construct a microscopic proton-nucleuspotential in order to describe the differential cross-sections over scattering angles of the protonelastic scattering by 12C and 13C in the range of available energies 14 - 22 MeV. The microscopicoptical potential is based on the folding model using the effective nucleon-nucleon interactionCDM3Yn. The results show the promising use of the CDM3Yn interactions at low and very lowenergies, which were originally used for nuclear reactions at intermediate energies. This could bethe premise for the study of nuclear reactions using CDM3Yn interaction in astrophysics at lowenergies.

scholarly journals ON THE BALANCE ENERGY AND NUCLEAR DYNAMICS IN PERIPHERAL HEAVY-ION COLLISIONS

2010 ◽  
Vol 19 (10) ◽  
pp. 2009-2021 ◽  
Author(s):  
RAJIV CHUGH ◽  
RAJEEV K. PURI
Keyword(s):  
Cross Sections ◽  
Size Dependence ◽  
System Size ◽  
Heavy Ion ◽  
Nucleon Nucleon ◽  
Quantum Molecular Dynamics ◽  
Nuclear Dynamics ◽  
Ion Collisions ◽  
Peripheral Collisions ◽  
Balance Energy

We present here the system size dependence of balance energy for semi-central and peripheral collisions using quantum molecular dynamics model. For this study, the reactions of Ne 20+ Ne 20, Ca 40+ Ca 40, Ni 58+ Ni 58, Nb 93+ Nb 93, Xe 131+ Xe 131, and Au 197+ Au 197 are simulated at different incident energies and impact parameters. A hard equation of state along with nucleon–nucleon cross-sections between 40 and 55 mb explains the data nicely. Interestingly, balance energy follows a power law ∝Aτ for the mass dependence at all colliding geometries. The power factor τ is close to [Formula: see text] in central collisions, whereas it is [Formula: see text] for peripheral collisions suggesting stronger system size dependence at peripheral geometries. This also suggests that in the absence of momentum dependent interactions, Coulomb's interaction plays an exceedingly significant role. These results are further analyzed for nuclear dynamics at the balance point.

Positron–inert-gas-atom elastic DCS measurements

1996 ◽  
Vol 74 (7-8) ◽  
pp. 474-482 ◽  
Author(s):  
W. E. Kauppila ◽  
C. K. Kwan ◽  
D. Przybyla ◽  
S. J. Smith ◽  
T. S. Stein
Keyword(s):  
Cross Sections ◽  
Theoretical Calculations ◽  
Structural Features ◽  
Inert Gas ◽  
Elastic Channel ◽  
Positron Scattering ◽  
Positron Energy ◽  
Direct Ionization ◽  
Intermediate Energies ◽  
Low Energies

In this paper we review prior measurements and report new measurements of elastic differential cross sections (DCSs) obtained in our laboratory for positron scattering by the inert gas atoms He, Ne, Ar, Kr, and Xe. The gases (Ne, Ar, Kr, and Xe) for which low-energy measurements have been made below and above the positronium (Ps)-formation thresholds show evidence that the Ps-formation channel is having an observable "absorption" effect on the elastic scattering channel when compared with calculations that only consider the elastic channel. At low energies where only the elastic channel is open, good agreement is found with available calculations. DCS measurements made at high energies (≥200 eV) for He, Ne, and Ar are also found to be consistent with theoretical calculations. At intermediate energies (above the Ps-formation thresholds and below a few hundred eV) theory has not yet been able to match the relative DCSs obtained experimentally owing to the difficulty of including the effects of the most important inelastic channels (i.e., Ps formation and direct ionization). Some initial attempts by our group to obtain absolute elastic DCSs at fixed scattering angles versus positron energy revealed unexpected structure between 55–60 eV for Ar and at 25 and 200 eV for Kr. Our most recent measurements reported here do not confirm the prior observations of these structural features.

scholarly journals A comprehensive analysis of differential cross sections and analyzing powers in the proton–deuteron break-up channel at 135 MeV

2021 ◽  
Vol 57 (2) ◽  
Author(s):  
H. Tavakoli-Zaniani ◽  
M. Eslami-Kalantari ◽  
H. R. Amir-Ahmadi ◽  
M. T. Bayat ◽  
A. Deltuva ◽  
...  
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Cross Sections ◽  
Theoretical Calculations ◽  
Nucleon Force ◽  
Satisfactory Description ◽  
Analyzing Powers ◽  
Global Comparison ◽  
Break Up ◽  
The Cross

AbstractA selection of measured cross sections and vector analyzing powers, $$A_{x}$$ A x and $$A_{y}$$ A y , are presented for the $$\vec {p}{d}$$ p → d break-up reaction. The data are taken with a polarized proton beam with a kinetic energy of 135 MeV using the Big Instrument for Nuclear-polarization Analysis (BINA) at KVI, the Netherlands. With this setup, $$A_{x}$$ A x is extracted for the first time for a large range of energies as well as polar and azimuthal angles of the two outgoing protons. For most of the configurations, the results at small and large relative azimuthal angles differ in behavior when comparing experimental data with the theoretical calculations. We also performed a more global comparison of our data with theoretical calculations. The cross-section results show huge values of $$\chi ^{2}$$ χ 2 /d.o.f.. The absolute values of $$\chi ^{2}$$ χ 2 /d.o.f. for the components of vector analyzing powers, $$A_{x}$$ A x and $$A_{y}$$ A y , are smaller than the ones for the cross section, partly due to larger uncertainties for these observables. However, also for these observables no satisfactory agreement is found for all angular combinations. This implies that the present models of a three-nucleon force are not able to provide a satisfactory description of experimental data.

scholarly journals Latest results concerning short range correlations obtained in the dp elastic and dp breakup processes at Nuclotron, JINR

2020 ◽  
Author(s):  
Marian Janek ◽  
Vladimir P. Ladygin ◽  
Alexander V. Averyanov ◽  
Eugene V. Chernykh ◽  
Dan D. Enache ◽  
...  
Keyword(s):  
Short Range ◽  
Spin Structure ◽  
Deuteron Beam ◽  
Nucleon Nucleon ◽  
Target Station ◽  
Analyzing Powers ◽  
Intermediate Energies ◽  
Elastic Data ◽  
Deuteron Spin ◽  
Short Range Correlations

Deuteron spin structure program is aimed on extraction of two and three nucleon forces information, including their spin dependent parts, from dp elastic and dp breakup processes investigated at intermediate energies. The dp elastic data were obtained at Internal Target Station of Nuclotron (JINR) in the energy range 400-1800 MeV using polarized deuteron beam. Strong sensitivity to the short range spin structure of the isoscalar nucleon-nucleon correlations is observed in deuteron analyzing powers. Preliminary results of the the cross section for the dp breakup reaction have been obtained at 400 MeV of deuteron energy.

scholarly journals Precision measurements of differential cross sections and analyzing powers in elastic deuteron-deuteron scattering at 65 MeV/nucleon

2021 ◽  
Vol 57 (4) ◽  
Author(s):  
R. Ramazani-Sharifabadi ◽  
A. Ramazani-Moghaddam-Arani ◽  
H. R. Amir-Ahmadi ◽  
C. D. Bailey ◽  
A. Deltuva ◽  
...  
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Deuteron Beam ◽  
Differential Cross Sections ◽  
Scattering Process ◽  
Systematic Analysis ◽  
Deuteron Scattering ◽  
Analyzing Powers ◽  
Spin Observables ◽  
Intermediate Energies

AbstractWe present measurements of differential cross sections and analyzing powers for the elastic $$^{2}\mathrm{H}(\mathbf {d},d){d}$$ 2 H ( d , d ) d scattering process. The data were obtained using a 130 MeV polarized deuteron beam. Cross sections and spin observables of the elastic scattering process were measured at the AGOR facility at KVI using two independent setups, namely BINA and BBS. The data harvest at setups are in excellent agreement with each other and allowed us to carry out a thorough systematic analysis to provide the most accurate data in elastic deuteron-deuteron scattering at intermediate energies. The results can be used to confront upcoming state-of-the-art calculations in the four-nucleon scattering domain, and will, thereby, provide further insights in the dynamics of three- and four-nucleon forces in few-nucleon systems.

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