SHELL MODEL BASED REACTION RATES FOR rp-PROCESS NUCLEI IN THE MASS RANGE A=44–63

2001 ◽  
Vol 79 (2) ◽  
pp. 241-292 ◽  
Author(s):  
J.L. FISKER ◽  
V. BARNARD ◽  
J. GÖRRES ◽  
K. LANGANKE ◽  
G. MARTÍNEZ-PINEDO ◽  
...  
Keyword(s):  
Shell Model ◽  
Mass Range ◽  
Reaction Rates ◽  
Model Based ◽  
Rp Process

scholarly journals Model-Based Estimation of Reaction Rates in Stirred Tank Bioreactors

1995 ◽  
Vol 28 (3) ◽  
pp. 259-264
Author(s):  
R. Oliveira ◽  
E.C. Ferreira ◽  
S.Feyo de Azevedo
Keyword(s):  
Reaction Rates ◽  
Stirred Tank ◽  
Model Based

RESONANCE STATES IN 22Mg, 26Si FOR REACTION RATES IN THE RP-PROCESS

2004 ◽  
Author(s):  
Y. SHIMIZU ◽  
K. HATANAKA ◽  
G.P.A. BERG ◽  
M. WIESCHER ◽  
H. SCHATZ ◽  
...  
Keyword(s):  
Reaction Rates ◽  
Resonance States ◽  
Rp Process

scholarly journals Rigorous Model-Based Design and Experimental Verification of Enzyme-Catalyzed Carboligation under Enzyme Inactivation

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 96
Author(s):  
Dominik Hertweck ◽  
Victor N. Emenike ◽  
Antje C. Spiess ◽  
René Schenkendorf
Keyword(s):  
Systems Engineering ◽  
Enzyme Catalysis ◽  
Process Intensification ◽  
Reaction Rates ◽  
Operating Conditions ◽  
Enzyme Inactivation ◽  
Feeding Rates ◽  
Model Based ◽  
Rigorous Model ◽  
Enzyme Catalyzed Reactions

Enzyme catalyzed reactions are complex reactions due to the interplay of the enzyme, the reactants, and the operating conditions. To handle this complexity systematically and make use of a design space without technical restrictions, we apply the model based approach of elementary process functions (EPF) for selecting the best process design for enzyme catalysis problems. As a representative case study, we consider the carboligation of propanal and benzaldehyde catalyzed by benzaldehyde lyase from Pseudomonas fluorescens (PfBAL) to produce (R)-2-hydroxy-1-phenylbutan-1-one, because of the substrate dependent reaction rates and the challenging substrate dependent PfBAL inactivation. The apparatus independent EPF concept optimizes the material fluxes influencing the enzyme catalyzed reaction for the given process intensification scenarios. The final product concentration is improved by 13% with the optimized feeding rates, and the optimization results are verified experimentally. In general, the rigorous model driven approach could lead to selecting the best existing reactor, designing novel reactors for enzyme catalysis, and combining protein engineering and process systems engineering concepts.

High-precision (p, t) Reactions to Determine Reaction Rates in the Stellar rp-process

2010 ◽  
Author(s):  
G. P. A. Berg ◽  
Y. Fujita ◽  
T. Adachi ◽  
A. M. van den Berg ◽  
H. Fujita ◽  
...  
Keyword(s):  
High Precision ◽  
Reaction Rates ◽  
Rp Process

THE APPROACH TO NUCLEAR STATISTICAL EQUILIBRIUM

1966 ◽  
Vol 44 (3) ◽  
pp. 563-592 ◽  
Author(s):  
J. W. Truran ◽  
A. G. W. Cameron ◽  
A. Gilbert
Keyword(s):  
Stellar Evolution ◽  
Reaction Network ◽  
Mass Range ◽  
Reaction Rates ◽  
Thermonuclear Reaction ◽  
Abundant Isotope ◽  
Method Of Solution ◽  
Nuclear Burning ◽  
Beta Decays ◽  
Late Stages

The transformation of a region composed initially of 28Si to nuclei in the vicinity of the iron peak, which is thought to take place in the late stages of evolution of some stars, is considered in detail. In order to follow these nuclear transformations, a nuclear reaction network is established providing suitable reaction links connecting neighboring nuclei. A method of solution of the network equations is outlined. Thermonuclear reaction rates for all neutron, proton, and alpha-particle reactions involving the nuclei in this network have been determined from a consideration of the statistical properties of nuclei. The evolution of this silicon region has been followed in time for two cases: T = 3 × 109 °K, ρ = 106 g cm−3 and T = 5 × 109 °K, ρ = 107 g cm−3. While both the observed solar and meteoritic abundances display a broad peak in the vicinity of iron, centered on 56Fe, in these calculations 54Fe is found to be the most abundant isotope in this mass range. Beta decays required to change the peak to 56Fe are very slow. As the transformation 2 28Si → 54Fe + 2p is endothermic by ~1.3 MeV, these results suggest that the silicon-to-iron conversion may not comprise an exothermic nuclear burning stage of stellar evolution.

scholarly journals Towards a unification of independent particle and collective models

2020 ◽  
Vol 19 ◽  
pp. 140
Author(s):  
G. S. Anagnostatos
Keyword(s):  
Shell Model ◽  
Collective Models ◽  
Fundamental Properties ◽  
Model Based ◽  
Independent Particle ◽  
Average Shape

A unification of Independent Particle and Collective Models is proposed via the Isomorphic Shell Model. Through this model, based on fundamental properties of fermions, an average shape for each nucleus is derived which simultaneously reproduces independent particle and collective properties. 20Ne is taken as an example.

Reaction Rates in the RP-Process and Nucleosynthesis in Novae

1986 ◽  
pp. 105-112 ◽  
Author(s):  
M. Wiescher ◽  
J. Görres ◽  
F.-K. Thielemann ◽  
H. Ritter
Keyword(s):  
Reaction Rates ◽  
Rp Process
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