Author: United States. National Aeronautics and Space AdministrationPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Proton-nucleus Elastic Cross Sections Using Two-body In-medium Scattering Amplitudes ... Nasa/tp-2001-211043 ... Oct. 11, 2001
Author: United States. National Aeronautics and Space AdministrationPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Proton-Nucleus Elastic Cross Sections Using Two-Body In-Medium Scattering Amplitudes
Author: R. K. TripathiPublisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 20
Book Description
Proton-Nucleus Elastic Cross Sections Using Two-Body In-Medium Scattering Amplitudes
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781721268665
Category :
Languages : en
Pages : 32
Book Description
Recently, a method was developed of extracting nucleon-nucleon (NN) cross sections in the medium directly from experiment. The in-medium NN cross sections form the basic ingredients of several heavy-ion scattering approaches including the coupled-channel approach developed at the Langley Research Center. The ratio of the real to the imaginary part of the two-body scattering amplitude in the medium was investigated. These ratios are used in combination with the in-medium NN cross sections to calculate elastic proton-nucleus cross sections. The agreement is excellent with the available experimental data. These cross sections are needed for the radiation risk assessment of space missions. Tripathi, R. K. and Wilson, John W. and Cucinotta, Francis A. Johnson Space Center; Langley Research Center NASA/TP-2001-211043, L-18089, NAS 1.60:211043
Proton-Nucleus Total Cross Sections in Coupled-Channel Approach
Author: R. K. TripathiPublisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 18
Book Description
Recently, nucleon-nucleon (N-N) cross sections in the medium have been extracted directly from experiment. The in-medium N-N cross sections form the basic ingredients of several heavy-ion scattering approaches including the coupled-channel approach developed at the Langley Research Center. In the present study the ratio of the real to the imaginary part of the two-body scattering amplitude in the medium was investigated. These ratios are used in combination with the in-medium N-N cross sections to calculate total proton-nucleus cross sections. The agreement is excellent with the available experimental data. These cross sections are needed for the radiation risk assessment of space missions.
Proton-Nucleus Total Cross Sections in Coupled-Channel Approach
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781721217137
Category :
Languages : en
Pages : 30
Book Description
Recently, nucleon-nucleon (N-N) cross sections in the medium have been extracted directly from experiment. The in-medium N-N cross sections form the basic ingredients of several heavy-ion scattering approaches including the coupled-channel approach developed at the Langley Research Center. In the present study the ratio of the real to the imaginary part of the two-body scattering amplitude in the medium was investigated. These ratios are used in combination with the in-medium N-N cross sections to calculate total proton-nucleus cross sections. The agreement is excellent with the available experimental data. These cross sections are needed for the radiation risk assessment of space missions. Tripathi, R. K. and Wilson, John W. and Cucinotta, Francis A. Johnson Space Center; Langley Research Center NASA/TP-2000-210534, L-17994, NAS 1.60:210534
Inclusive Proton Spectra and Total Reaction Cross Sections for Proton-nucleus Scattering at 800 MeV.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Current applications of multiple scattering theory to describe the elastic scattering of medium energy protons from nuclei have been shown to be quite successful in reproducing the experimental cross sections. These calculations use the impulse approximation, wherein the scattering from individual nucleons in the nucleus is described by the scattering amplitude for a free nucleon. Such an approximation restricts the inelastic channels to those initiated by nucleon-nucleon scattering. As a first step in determining the nature of p + nucleus scattering at 800 MeV, both total reaction cross sections and (p, p') inclusive cross sections were measured and compared to the free p + p cross sections for hydrogen, deuterium, calcium 40, carbon 12, and lead 208. It is concluded that as much as 85% of all reactions in a nucleus proceed from interactions with a single nucleon in the nucleus, and that the impulse approximation is a good starting point for a microscopic description of p + nucleus interactions at 800 MeV.
Extraction of In-Medium Nucleon-Nucleon Amplitude from Experiment
Author: National Aeronautics and Space Adm NasaPublisher: Independently Published
ISBN: 9781792610196
Category :
Languages : en
Pages : 30
Book Description
The in-medium nucleon-nucleon amplitudes are extracted from the available proton-nucleus total reaction cross sections data. The retrieval of the information from the experiment makes the estimate of reaction cross sections very reliable. Simple expressions are given for the in-medium nucleon-nucleon amplitudes for any system of colliding nuclei as a function of energy. Excellent agreement with experimental observations is demonstrated in the ion-nucleus interactions. Tripathi, R. K. and Cucinotta, Francis A. and Wilson, John W. Johnson Space Center; Langley Research Center NASA/TP-1998-208438, NAS 1.60:208438, L-17674 NCC1-242; RTOP 199-45-16-12...
Kaon-Nucleus Scattering
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722328863
Category :
Languages : en
Pages : 30
Book Description
The derivations of the Lippmann-Schwinger equation and Watson multiple scattering are given. A simple optical potential is found to be the first term of that series. The number density distribution models of the nucleus, harmonic well, and Woods-Saxon are used without t-matrix taken from the scattering experiments. The parameterized two-body inputs, which are kaon-nucleon total cross sections, elastic slope parameters, and the ratio of the real to the imaginary part of the forward elastic scattering amplitude, are presented. The eikonal approximation was chosen as our solution method to estimate the total and absorptive cross sections for the kaon-nucleus scattering. Hong, Byungsik and Maung, Khin Maung and Wilson, John W. and Buck, Warren W. Langley Research Center RTOP 199-22-76-01...
Elastic Scattering Cross-sections of 14.5 MeV Protons for Medium Weight Nuclei
Author: John Gordon KellyNew Parameterization of Neutron Absorption Cross Sections
Author: National Aeronautics and Space Adm NasaPublisher: Independently Published
ISBN: 9781792702518
Category :
Languages : en
Pages : 28
Book Description
Recent parameterization of absorption cross sections for any system of charged ion collisions, including proton-nucleus collisions, is extended for neutron-nucleus collisions valid from approx. 1 MeV to a few GeV, thus providing a comprehensive picture of absorption cross sections for any system of collision pairs (charged or uncharged). The parameters are associated with the physics of the problem. At lower energies, optical potential at the surface is important, and the Pauli operator plays an increasingly important role at intermediate energies. The agreement between the calculated and experimental data is better than earlier published results. Tripathi, Ram K. and Wilson, John W. and Cucinotta, Francis A. Langley Research Center NASA-TP-3656, NAS 1.60:3656, L-17598 RTOP 199-45-16-11...