Confronting electron and neutrino–nucleus interactions: Can the axial mass anomaly be resolved?

2014 ◽  
Vol 23 (04) ◽  
pp. 1430005 ◽  
Author(s):  
Omar Benhar
Keyword(s):  
Cross Sections ◽  
Target Nucleus ◽  
Reaction Mechanisms ◽  
Short Review ◽  
Scattering Data ◽  
Final States ◽  
Neutrino Interactions ◽  
Axial Mass ◽  
Nucleus Scattering

Comparison between electron– and neutrino–nucleus scattering data suggests that the so-called axial mass anomaly — i.e., the large disagreement between the value of the nucleon axial mass extracted from the analysis of neutrino interactions with carbon and oxygen and that obtained from deuteron data — is a manifestation of the difficulties in the interpretation of the flux averaged neutrino cross-sections. In this short review, I discuss the role of reaction mechanisms leading to the excitation of two particle–two hole final states of the target nucleus, which are believed to be responsible for the observed excess of quasielastic events, and argue that taking into account their effect may help to reconcile the sizeably different values of the axial mass reported by the MiniBooNe and NOMAD Collaborations.

Theoretical Evaluation of Neutron-nucleus Scattering Parameters from Experimental Data in the 6 ≤ A ≤ 60 Mass Region

1998 ◽  
Vol 53 (10-11) ◽  
pp. 855-862 ◽  
Author(s):  
A. Aleksejevs ◽  
S. Barkanova ◽  
J. Tambergs ◽  
T. Krasta ◽  
W. Waschkowski ◽  
...  
Keyword(s):  
Cross Sections ◽  
Mass Region ◽  
Scattering Data ◽  
Matrix Formalism ◽  
Scattering Parameters ◽  
Theoretical Evaluation ◽  
Least Squares Fit ◽  
Optical Model Potential ◽  
Nucleus Scattering ◽  
Scattering Lengths

AbstractSystematic calculations of the neutron-nucleus scattering parameters at several neutron energies Ei < 2 keV have been performed for 37 isotopes (6Li,... 59Co) in the mass region of 6 ≤ A ≤ 60, using the large compilation of experimental neutron-nucleus scattering data obtained in Garching. In the first stage of these calculations, the s-wave potential scattering radius R’, the scattering lengths bcoh, b±, and the bound state parameters (Eb, Γγ , gΓ0n) have been calculated for each isotope, employing the general least squares fit (GLSQF) for the experimental and the corresponding theoretical values of the total neutron-nucleus cross sections σexptot(Ei) at several energies Ei, absorption cross sections σabs(Eo) and of the coherent scattering lengths bcoh. The theoretical expressions for these parameters were deduced on the basis of the usual S-matrix formalism with no assumption about the particular shape of the optical model potential. In the second stage of our calculations, the spherical Fiedeldey- Frahn optical potential was employed for the pure theoretical description or the above mentioned neutron-nucleus scattering characteristics. The results obtained have been analyzed and compared with the values deduced from measurements.

scholarly journals Recent Developments in Neutrino/Antineutrino-Nucleus Interactions

2012 ◽  
Vol 2012 ◽  
pp. 1-35 ◽  
Author(s):  
Jorge G. Morfín ◽  
Juan Nieves ◽  
Jan T. Sobczyk
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Scattering Data ◽  
Theoretical Treatment ◽  
Quasielastic Scattering ◽  
Current Contribution ◽  
The Status ◽  
Recent Developments ◽  
Nucleus Scattering ◽  
Nuclear Effects

Recent experimental results and developments in the theoretical treatment of neutrino-nucleus interactions in the energy range of 1–10 GeV are discussed. Difficulties in extracting neutrino-nucleon cross sections from neutrino-nucleus scattering data are explained and significance of understanding nuclear effects for neutrino oscillation experiments is stressed. Detailed discussions of the status of two-body current contribution in the kinematic region dominated by quasielastic scattering and specific features of partonic nuclear effects in weak DIS scattering are presented.

scholarly journals TESTING 6,8He DENSITY DISTRIBUTIONS BY CALCULATIONS OF TOTAL REACTION CROSS-SECTIONS OF 6,8He+28Si

2004 ◽  
Vol 13 (03) ◽  
pp. 573-583 ◽  
Author(s):  
V. K. LUKYANOV ◽  
E. V. ZEMLYANAYA ◽  
S. E. MASSEN ◽  
Ch. C. MOUSTAKIDIS ◽  
A. N. ANTONOV ◽  
...  
Keyword(s):  
Cross Sections ◽  
Reaction Cross ◽  
Scattering Data ◽  
Total Reaction ◽  
Density Distributions ◽  
Intermediate Energies ◽  
Limit Model ◽  
Optical Limit ◽  
Nucleus Scattering ◽  
Reaction Cross Sections

Calculations of the 6,8 He +28 Si total reaction cross-sections at intermediate energies are performed on the basis of the Glauber–Sitenko microscopic optical-limit model. The target-nucleus density distribution is taken from the electron-nucleus scattering data, and the 6,8 He densities are used as they are derived in different models. The results of the calculations are compared with existing experimental data. The effects of the density tails of the projectile nuclei as well as the role of shell admixtures and short-range correlations are analyzed.

Role of axial mass and strange axial form factor from various target nuclei in neutrino-nucleus scattering

2019 ◽  
Vol 100 (3) ◽  
Author(s):  
K. S. Kim ◽  
Ki-Seok Choi ◽  
Myung-Ki Cheoun ◽  
W. Y. So ◽  
Heejang Moon
Keyword(s):  
Form Factor ◽  
Axial Form Factor ◽  
Axial Mass ◽  
Axial Form ◽  
Nucleus Scattering

scholarly journals Rosetta Mission: Electron Scattering Cross Sections - Data Needs and Coverage in BEAMDB Database

2017 ◽  
Author(s):  
Bratislav P. Marinković ◽  
Jan Hendrik Bredehöft ◽  
Veljko Vujčić ◽  
Darko Jevremović ◽  
Nigel J. Mason
Keyword(s):  
Electron Impact ◽  
Electron Scattering ◽  
Cross Sections ◽  
Molecular Data ◽  
Scattering Data ◽  
Particle Analysis ◽  
Detailed Knowledge ◽  
Molecular Systems ◽  
Rosetta Mission

The emission of [O I] lines in the coma of Comet 67P/Churyumov-Gerasimenko during the Rosetta mission have been explained by electron impact dissociation of water rather than the process of photodissociation. This is the direct evidence for the role of electron induced processing has been seen on such a body. Analysis of other emission features is handicapped by a lack of detailed knowledge of electron impact cross sections which highlights the need for a broad range of electron scattering data from the molecular systems detected on the comet. In this paper we present an overview of the needs for electron scattering data relevant for the understanding of observations in coma, the tenuous atmosphere and on the surface of 67P/Churyumov-Gerasimenko during the Rosetta mission. The relevant observations for elucidating the role of electrons come from optical spectra, particle analysis using the ion and electron sensors and mass spectrometry measurements. To model these processes electron impact data should be collated and reviewed in an electron scattering database and an example is given in the BEAMD, which is a part of a larger consortium of Virtual Atomic and Molecular Data Centre &ndash; VAMDC.

scholarly journals Rosetta Mission: Electron Scattering Cross Sections—Data Needs and Coverage in BEAMDB Database

2017 ◽  
Author(s):  
Bratislav P. Marinković ◽  
Jan Hendrik Bredehöft ◽  
Veljko Vujčić ◽  
Darko Jevremović ◽  
Nigel J. Mason
Keyword(s):  
Electron Impact ◽  
Electron Scattering ◽  
Cross Sections ◽  
Molecular Data ◽  
Scattering Data ◽  
Particle Analysis ◽  
Detailed Knowledge ◽  
Molecular Systems ◽  
Rosetta Mission

The emission of [O I] lines in the coma of Comet 67P/Churyumov-Gerasimenko during the Rosetta mission have been explained by electron impact dissociation of water rather than the process of photodissociation. This is the direct evidence for the role of electron induced processing has been seen on such a body. Analysis of other emission features is handicapped by a lack of detailed knowledge of electron impact cross sections which highlights the need for a broad range of electron scattering data from the molecular systems detected on the comet. In this paper we present an overview of the needs for electron scattering data relevant for the understanding of observations in coma, the tenuous atmosphere and on the surface of 67P/Churyumov-Gerasimenko during the Rosetta mission. The relevant observations for elucidating the role of electrons come from optical spectra, particle analysis using the ion and electron sensors and mass spectrometry measurements. To model these processes electron impact data should be collated and reviewed in an electron scattering database and an example is given in the BEAMD, which is a part of a larger consortium of Virtual Atomic and Molecular Data Centre &ndash; VAMDC.

scholarly journals Role of the shape deformation in 12C + 12C fusion at sub-Coulomb energies

2019 ◽  
Vol 2 (4) ◽  
pp. 112-118
Author(s):  
Chien Hoang Le ◽  
Anh Viet Bui ◽  
Vy Nguyen Ha Thach
Keyword(s):  
Cross Sections ◽  
Surface Deformation ◽  
Good Description ◽  
Fusion Cross Section ◽  
Scattering Data ◽  
Angular Distributions ◽  
The Real ◽  
S Factor ◽  
Barrier Penetration

The fusion cross section of 12C+12C system at the energies of astrophysical interest is calculated in the framework of barrier penetration model taking into account the deformed shape of interacting nuclei. In particular, the quadrupole surface deformation of both projectile and target nuclei has been included during the fusion process. The real and imaginary parts of nucleus-nucleus interactions performed using the Woods-Saxon square and Woods-Saxon functions, respectively have been carefully tested by 12C-12C elastic scattering data analysis before employed to evaluate the astrophysical S factors (the fusion cross sections). The optical model results of elastic angular distributions are consistent with the experimental data. Within the barrier penetration model, the real part of the obtained optical potential gives a good description of the non-resonant astrophysical S factor. It turns out that the taking into account of quadrupole deformation of 12C nuclei increases the astrophysical S factor at energies below Coulomb barrier.

Oxygen K near edge structures studied with multiple scattering calculations

1988 ◽  
Vol 46 ◽  
pp. 504-505
Author(s):  
Xudong Weng ◽  
Peter Rez
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Partial Cross Section ◽  
Energy Window ◽  
Edge Structure ◽  
Fine Structures ◽  
Hydrogenic Model ◽  
Electron Energy Loss ◽  
Quantitative Chemical

In electron energy loss spectroscopy, quantitative chemical microanalysis is performed by comparison of the intensity under a specific inner shell edge with the corresponding partial cross section. There are two commonly used models for calculations of atomic partial cross sections, the hydrogenic model and the Hartree-Slater model. Partial cross sections could also be measured from standards of known compositions. These partial cross sections are complicated by variations in the edge shapes, such as the near edge structure (ELNES) and extended fine structures (ELEXFS). The role of these solid state effects in the partial cross sections, and the transferability of the partial cross sections from material to material, has yet to be fully explored. In this work, we consider the oxygen K edge in several oxides as oxygen is present in many materials. Since the energy window of interest is in the range of 20-100 eV, we limit ourselves to the near edge structures.

POPDC proteins and cardiac function

2019 ◽  
Vol 47 (5) ◽  
pp. 1393-1404 ◽  
Author(s):  
Thomas Brand
Keyword(s):  
Potential Role ◽  
Striated Muscle ◽  
Short Review ◽  
Effector Proteins ◽  
Muscle Disease ◽  
Disease Genes ◽  
Protein Protein Interaction ◽  
Interaction Partners ◽  
And Function

Abstract The Popeye domain-containing gene family encodes a novel class of cAMP effector proteins in striated muscle tissue. In this short review, we first introduce the protein family and discuss their structure and function with an emphasis on their role in cyclic AMP signalling. Another focus of this review is the recently discovered role of POPDC genes as striated muscle disease genes, which have been associated with cardiac arrhythmia and muscular dystrophy. The pathological phenotypes observed in patients will be compared with phenotypes present in null and knockin mutations in zebrafish and mouse. A number of protein–protein interaction partners have been discovered and the potential role of POPDC proteins to control the subcellular localization and function of these interacting proteins will be discussed. Finally, we outline several areas, where research is urgently needed.

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