Overview of nuclear reaction models used in nuclear data evaluation

2001 ◽  
Vol 89 (4-5) ◽  
Author(s):  
M. Herman
Keyword(s):  
Nuclear Reaction ◽  
Optical Model ◽  
Nuclear Data ◽  
Data Evaluation ◽  
Quantum Mechanical ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Coupled Channels ◽  
Reaction Models

A brief outline of nuclear reaction mechanisms including the optical model, the Distorted Wave Born Approximation, the Coupled Channels, classical and quantum-mechanical preequilibrium models and the Compound Nucleus is given. The relations among different nuclear reaction and structure models are indicated. The paper is addressed to the users of nuclear data and seeks to explain basic physical concepts and the role of nuclear reaction models in data evaluation.

scholarly journals New paradigm for nuclear data evaluation

2020 ◽  
Vol 239 ◽  
pp. 11001
Author(s):  
M. Herman ◽  
D.A. Brown ◽  
M.B. Chadwick ◽  
W. Haeck ◽  
T. Kawano ◽  
...  
Keyword(s):  
Nuclear Reaction ◽  
Error Compensation ◽  
Nuclear Data ◽  
Covariance Matrices ◽  
Data Evaluation ◽  
New Paradigm ◽  
New Approach ◽  
Reaction Data ◽  
Cross Correlations

A new paradigm for nuclear reaction data evaluations is proposed to produce adjusted libraries that take into account integral experiments on the same footing as the differential ones. These evaluations will provide comprehensive covariance matrices including cross-correlations among different materials/reactions that are critical for realistic propagation of data uncertainties to integral quantities. The new approach should also reduce error compensation issues and facilitate updating of the library to account for new or corrected experiments and advances in reaction modeling.

One-two step transfer observed in 16O+11B nuclear system

2015 ◽  
Vol 24 (06) ◽  
pp. 1550047 ◽  
Author(s):  
Sh. Hamada ◽  
N. Burtebayev
Keyword(s):  
Angular Distribution ◽  
Cross Section ◽  
Born Approximation ◽  
Optical Model ◽  
Ion Beam ◽  
Nuclear System ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Cluster Transfer ◽  
Spectroscopic Amplitude

The angular distribution measurements for 16O ion beam elastically scattered from 11 B target of thickness 32.9μg/cm2 at energy 22.4 MeV had been performed in the cyclotron DC-60 INP NNC RK. The previous measurements for 16 O +11 B nuclear system at energies 27, 30, 32.5 and 35 MeV showed an increase in the differential cross-section at backward angles due to the contribution of cluster transfer. Such transfer process could not be described in terms of optical model (OM); it could be described within the framework of distorted wave Born approximation method implemented in FRESCO code. Both one (5 Li ) and two-step transfer (proton transfer followed by Alpha transfer) were taken into considerations. We have extracted the spectroscopic amplitude (SA) for the configuration 16 O →11 B +5 Li .

scholarly journals Extension of the nuclear reaction model code EMPIRE to actinides' nuclear data evaluation

2007 ◽  
Author(s):  
R. Capote ◽  
M. Sin ◽  
A. Trkov ◽  
M. Herman ◽  
B. V. Carlson ◽  
...  
Keyword(s):  
Nuclear Reaction ◽  
Nuclear Data ◽  
Reaction Model ◽  
Data Evaluation ◽  
Model Code

Measurement and analysis of 10B +12C elastic scattering at energy of 41.3MeV

2019 ◽  
Vol 28 (04) ◽  
pp. 1950028 ◽  
Author(s):  
N. Burtebayev ◽  
M. Nassurlla ◽  
A. Sabidolda ◽  
S. B. Sakuta ◽  
A. A. Karakhodjaev ◽  
...  
Keyword(s):  
Experimental Data ◽  
Elastic Scattering ◽  
Cross Sections ◽  
Optical Model ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
Measurement And Analysis ◽  
Spectroscopic Amplitude ◽  
Deuteron Transfer ◽  
Forward Hemisphere

Angular distribution of the [Formula: see text] elastic scattering was measured at [Formula: see text][Formula: see text]MeV. Experimental data showed a significant increase in differential cross-sections at backward angles. The optical model with phenomenological potentials reproduces well the experimental cross-sections in the region of the angles of the forward hemisphere, but is not able to explain the increase in cross-sections at large angles. The distorted wave Born approximation method was used to reproduce the experimental data at large angles [Formula: see text] by taking into consideration a deuteron transfer. Spectroscopic amplitude has been extracted for the configuration [Formula: see text]C[Formula: see text]B + [Formula: see text] from the analysis.

ROLE OF THE HE ATOM SURFACE POTENTIAL ON THE CU(001) PHONON DETERMINATION

1994 ◽  
Vol 01 (01) ◽  
pp. 67-74 ◽  
Author(s):  
A. FRANCHINI ◽  
G. SANTORO ◽  
V. BORTOLANI ◽  
A. BELLMAN ◽  
D. CVETKO ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Inelastic Scattering ◽  
Rayleigh Wave ◽  
Interaction Potential ◽  
Born Approximation ◽  
Large Momentum ◽  
Distorted Wave ◽  
Distorted Wave Born Approximation ◽  
He Atom

We present new measurements of He atom inelastic scattering from the (001) surface of Copper. Our results confirmed the recent data obtained in Gottingen and show that at large momentum transfer in the [Formula: see text] direction the intensity of the longitudinal resonance is larger than that of the Rayleigh wave. We interpret these results by evaluating the reflection coefficient in the Distorted Wave Born Approximation. By taking the He surface interaction potential as a sum of nonspherical pairwise potential we are able to explain quantitatively the behavior of the experimental spectra.

The Role of the Nuclear Reaction Data Centres in Experimental Nuclear Data Knowledge Sharing

2011 ◽  
Vol 59 (2(3)) ◽  
pp. 1292-1297 ◽  
Author(s):  
N. Otuka ◽  
S. Dunaeva ◽  
E. Dupont ◽  
O. Schwerer ◽  
A. Blokhin
Keyword(s):  
Knowledge Sharing ◽  
Nuclear Reaction ◽  
Nuclear Data ◽  
Reaction Data ◽  
Data Centres
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