scholarly journals Development of a Monte-Carlo Evaporation Code for Multiple-Fragment Emission

2021 ◽  
Vol 12 ◽  
pp. 136
Author(s):  
N. G. Nicolis
Keyword(s):  
Monte Carlo ◽  
Excitation Energy ◽  
Excited States ◽  
Compound Nucleus ◽  
S Wave ◽  
Intermediate Mass ◽  
Wave Approximation ◽  
Decay Widths ◽  
Study Case ◽  
Multiple Fragment

An extended Hauser-Feshbach approach has been employed in a multi-step Monte-Carlo evaporation code designed to study the de-excitation of highly excited compound nuclei. The code is intended to account for emission of light particles ($\gamma$, n, $^{1,2,3}$H, $^{3-6}$He) and intermediate mass fragments in their ground and excited states (particle-bound or unbound). As a study case, we consider the decay of the compound nucleus $^{120}$Te$^*$ at excitation energy 100, 200 and 300 MeV. First chance decay widths are compared with treatments based on the Weisskopf and the s-wave approximation. Preliminary calculations are compared with experimental isotopic yields of intermediate mass fragments emitted in E/A = 50 MeV $^{4}$He + $^{116,124}$Sn $\rightarrow$ $^{120,128}$Te$^*$ reactions.

scholarly journals The transmutation of magnesium, aluminium and silicon by deuterons

1948 ◽  
Vol 194 (1036) ◽  
pp. 131-145 ◽  
Keyword(s):  
Excited State ◽  
Excitation Energy ◽  
Excited States ◽  
Satisfactory Agreement ◽  
Compound Nucleus ◽  
Maximum Energy ◽  
Nuclear Mass ◽  
Proton Group ◽  
Q Values ◽  
Induced Radioactivity

A study has been made of the protons emitted by magnesium, aluminium and silicon targets when bombarded by deuterons of energy between 700 and 1000 keV. The Q values of these (d, p) reactions have been accurately determined. Observations of the induced radioactivity in the targets and comparisons with the Q values in analogous nuclei permit tentative assignments to the isotopes responsible. The Q values and assignments are: 24Mg (d, p) 2SMg 26Mg (d, p) 26Mg* 2®Mg (d, p) 27Mg 27A1 (d, p ) 28A1 28Si (d, p)2»Si “ Si (d, p)«Si Q = 5 03 MeV Q = 4-45 MeV (to excited state) Q = 4 05 MeV Q = 5-46 MeV = 4-46 MeVl = 3-98 MeV 1 (to excited states) = 3-31 MeV j Q = 6-16 MeV .= 4-87 MeV) .. .. , . , . = 3-75 MeV j The yield of the proton group attributed to 26 Mg (d, p ) 26 Mg* shows a resonance at 955 kV bombarding voltage, as does also the yield of radioactive 26 A1 formed in the reaction 26 Mg (d, n) 26 A1. This indicates a resonance level in the compound nucleus 27A1 at an excitation energy of 17 MeV. The maximum energy of the β+ rays from 26 A1 was measured as 2-8 MeV. The Q values listed above lead to a set of nuclear mass values, but these mass values are not always in satisfactory agreement with the published Q values for certain other reactions.

scholarly journals Resonant Elastic Scattering

2018 ◽  
Vol 184 ◽  
pp. 01006 ◽  
Author(s):  
Francois de Oliveira Santos
Keyword(s):  
Elastic Scattering ◽  
Excitation Energy ◽  
Excitation Function ◽  
Excited States ◽  
Compound Nucleus ◽  
Partial Width ◽  
Nuclear Spectroscopy ◽  
Total Width ◽  
Powerful Method ◽  
Unbound States

Elastic scattering of nuclei at energies typically below 10 MeV/nucleon can be used as a powerful method for studying nuclear spectroscopy. Resonances are observed in the excitation function, corresponding to unbound states in the compound nucleus. The analysis of the shape of these resonances can provide the excitation energy, the total width, the partial width, and the spin of the excited states.

ORBITALLY EXCITED STATES OF QUARKONIA IN A NONRELATIVISTIC MODEL

2012 ◽  
Vol 27 (03n04) ◽  
pp. 1250011 ◽  
Author(s):  
BHAGHYESH ◽  
K. B. VIJAYA KUMAR ◽  
YONG-LIANG MA
Keyword(s):  
Wave Function ◽  
Excited States ◽  
Mass Spectra ◽  
Radiative Decay ◽  
Theoretical Models ◽  
Model Parameters ◽  
Linear Potential ◽  
S Wave ◽  
Oscillator Wave Function ◽  
Decay Widths

Having succeeded in predicting the S wave spectra and decays of [Formula: see text] and [Formula: see text] mesons, Bhaghyesh, K. B. Vijaya Kumar and A. P. Monteiro, J. Phys. G: Nucl. Part. Phys.38, 085001 (2011), in this article, we apply our nonrelativistic quark model to calculate the spectra and decays of the orbitally excited states (P- and D-waves) of heavy quarkonia. The full [Formula: see text] potential used in our model consists of a Hulthen potential and a confining linear potential. The spin hyperfine, spin-orbit and tensor interactions are introduced to obtain the masses of the P- and D-wave states. The three-dimensional harmonic oscillator wave function is employed as a trial wave function to obtain the mass spectra. The model parameters and the wave function that reproduce the mass spectra of [Formula: see text] and [Formula: see text] mesons are used to investigate their decay properties. The two-photon decay widths, two-gluon decay widths and E1 radiative decay widths are calculated. The obtained values are compared with the experimental results and those obtained from other theoretical models.

scholarly journals Vector meson-baryon octet interaction and resonances generated dynamically

2014 ◽  
Vol 29 ◽  
pp. 1460211 ◽  
Author(s):  
B.-X. Sun ◽  
Y.-W. Wang
Keyword(s):  
Vector Meson ◽  
Experimental Observation ◽  
Tensor Interaction ◽  
Contact Term ◽  
Baryon Octet ◽  
Particle Data Group ◽  
S Wave ◽  
Wave Approximation ◽  
Decay Widths ◽  
Data Group

The interaction potentials between vector mesons and baryon octet are calculated explicitly with a summation of t-, s-, and u- channel diagrams and a contact term originating from the tensor interaction. Altogether, 13 resonances are generated dynamically in different channels of strangeness zero by solving the relativistic Lippman-Schwinger equations in the S-wave approximation, and their masses, decay widths, isospins and spins are determined. Some resonances are well fitted with their counterparts listed in the newest review of Particle Data Group (PDG),1 while others might stimulate the experimental observation in these energy regions in the future.

scholarly journals Interface Roughening in Two Dimensions

2021 ◽  
Vol 182 (3) ◽  
Author(s):  
Gernot Münster ◽  
Manuel Cañizares Guerrero
Keyword(s):  
Field Theory ◽  
Monte Carlo ◽  
Capillary Wave ◽  
System Size ◽  
Two Dimensions ◽  
Two Dimensional ◽  
Wave Approximation ◽  
Statistical Field ◽  
Statistical Field Theory ◽  
Interface Roughening

AbstractRoughening of interfaces implies the divergence of the interface width w with the system size L. For two-dimensional systems the divergence of $$w^2$$ w 2 is linear in L. In the framework of a detailed capillary wave approximation and of statistical field theory we derive an expression for the asymptotic behaviour of $$w^2$$ w 2 , which differs from results in the literature. It is confirmed by Monte Carlo simulations.

Modification of HAM/3 excitation energies for ΠΠ* transitions of linear molecules

1980 ◽  
Vol 58 (16) ◽  
pp. 1687-1690 ◽  
Author(s):  
Delano P. Chong
Keyword(s):  
Excitation Energy ◽  
Explicit Expression ◽  
Excited States ◽  
Configuration Interaction ◽  
Excitation Energies ◽  
Carbon Suboxide ◽  
Numerical Examples ◽  
Energy Correction ◽  
Linear Molecules ◽  
Configuration Interaction Calculations

The excitation energies calculated by the HAM/3 procedure for ΠΠ* transitions in linear molecules can be internally inconsistent by as much as ± 0.6 eV. In the recent study by Åsbrink etal., the problem was avoided by adopting Recknagel's expressions and requiring the proper average ΠΠ* excitation energy. In this paper, we trace the small inconsistency back to its origin in HAM/3 theory and derive the analytical expression for the energy correction as well as Recknagel's formulas. Numerical examples studied include all seven linear molecules investigated by Åsbrink etal. The explicit expression for the correction enables us to perform meaningful configuration-interaction calculations on the excited states, as illustrated by the carbon suboxide molecule.

scholarly journals Monte Carlo Simulation for Statistical Decay of Compound Nucleus

2012 ◽  
Vol 21 ◽  
pp. 04001 ◽  
Author(s):  
T. Kawano ◽  
P. Talou ◽  
M.B. Chadwick
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Compound Nucleus ◽  
Statistical Decay
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