scholarly journals Low lying oscillations of deformed nuclei

2018 ◽  
Vol 178 ◽  
pp. 02009
Author(s):  
Ani Aprahamian ◽  
Shelly R. Lesher
Keyword(s):  
Nuclear Structure ◽  
Vibrational Excitation ◽  
Deformed Nuclei ◽  
Vibrational Excitations

Low-lying oscillations of the intrinsic deformed shape of a nucleus remain an open challenge in nuclear structure. The question or challenge revolves around the viability of single or multiple quanta of vibrational excitations superimposed on the equilibrium, deformed shape of a nucleus. The K=2 or “γ” vibrations are fairly widespread and nominally conform to expectations whereas the existence of the K=0 or “β” vibrational excitation is yet to be distinguished from other possible origins including the coexistence of other potential minima.

EFFECTS OF ROTATIONAL AND VIBRATIONAL EXCITATION ON THE STEREODYNAMICS OF THE O (D-1) + HCl → OH + Cl REACTION

2009 ◽  
Vol 08 (06) ◽  
pp. 1177-1184 ◽  
Author(s):  
QIANG WEI ◽  
VICTOR WEI-KEH WU ◽  
BO ZHOU
Keyword(s):  
Cross Sections ◽  
Collision Energy ◽  
Energy Surface ◽  
Vibrational Excitation ◽  
Classical Trajectory ◽  
Rotational Excitation ◽  
Title Reaction ◽  
Vibrational Excitations ◽  
Product Vector ◽  
Good Agreement

The stereodynamics of the title reaction on the ground 1 1A′ potential energy surface (PES) has been studied using quasi-classical trajectory (QCT) method. Collision energy of 6.4 kcal/mol is considered, and vector properties including angular momentum alignment distributions and polarization-dependent differential cross-sections (PDDCS) of the product OH are presented. Furthermore, the influence of reagent rotational excitation and vibrational excitation on the product vector properties has also been studied in the present work. The results indicate that the distribution of the P(θr) and P(ϕr) are sensitively affected by the rotational and vibrational excitation. The rotational excitation decreases the degree of alignment and orientation, while vibrational excitation increases the degree of alignment and orientation. The PDDCS (2π/σ)(dσ20/dωt) and (2π/σ)(dσ22+/dωt) are sensitively influenced by rotational and vibrational excitations, while the PDDCS ((2π/σ)(dσ00/dωt)) and (2π/σ)(dσ21-/dωt) are not. The preference of forward scattering has been found from the results of PDDCS ((2π/σ)(dσ00/dωt)), which is in good agreement with the experimental results.

Photoreactions as a probe for nuclear structure in deformed nuclei

1976 ◽  
Vol 35 (1) ◽  
pp. 115-124 ◽  
Author(s):  
P. Christillin ◽  
M. Rosa-Clot
Keyword(s):  
Nuclear Structure ◽  
Deformed Nuclei

Pion single-charge-exchange scattering and nuclear structure in deformed nuclei

1989 ◽  
Vol 196 (1) ◽  
pp. 89-134 ◽  
Author(s):  
Johann Bartel ◽  
Mikkel B Johnson ◽  
M.K Singham
Keyword(s):  
Nuclear Structure ◽  
Charge Exchange ◽  
Single Charge ◽  
Deformed Nuclei ◽  
Exchange Scattering

scholarly journals NUCLEAR STRUCTURE CALCULATONS FOR DEFORMED NUCLEI

1964 ◽  
Author(s):  
K. Dietrich ◽  
H.-J. Mang ◽  
J. Pradal
Keyword(s):  
Nuclear Structure ◽  
Deformed Nuclei

Quadrupole and Hexadecapole Vibrational Excitations in Deformed Nuclei

1997 ◽  
Vol 06 (03) ◽  
pp. 437-473 ◽  
Author(s):  
V. G. Soloviev ◽  
A. V. Sushkov ◽  
N. Yu. Shirikova
Keyword(s):  
Experimental Data ◽  
Rare Earth ◽  
Energy Range ◽  
Strength Distribution ◽  
Wave Functions ◽  
Nuclear Model ◽  
Vibrational States ◽  
Deformed Nuclei ◽  
Structure Information ◽  
Vibrational Excitations

Energies, wave functions of the quadrupole and hexadecapole states, B(Eλ) and B(M1) values are calculated within the quasiparticle-phonon nuclear model in a number of well-deformed even-even nuclei in the rare earth region. Reasonably good overall agreement with available experimental data is obtained. Specific properties of the Kπ = 0+ and two-gamma vibrational states are discussed. The distributions of the M1 strength is studied. It is shown that the M1 strength is more strongly fragmented in Er isotopes compared to Gd and Dy isotopes. The fragmentation of one- and two-phonon states is investigated. The fragmentation of one-phonon states strongly affects the Eλ and M1 strength distribution at energies above 2.5–3.0 MeV. The wave functions in the energy range 2–4 MeV contain specific nuclear structure information and these states cannot be treated as chaotic.

SIMPLE TOOL TO SEARCH QUASI-MAGIC STRUCTURES IN DEFORMED NUCLEI

2009 ◽  
Vol 18 (04) ◽  
pp. 1099-1103 ◽  
Author(s):  
BOŻENA NERLO-POMORSKA ◽  
KRZYSZTOF POMORSKI
Keyword(s):  
Energy Density ◽  
Nuclear Structure ◽  
Single Particle ◽  
Particle Number ◽  
Energy Difference ◽  
Energy Space ◽  
Deformation Space ◽  
Deformed Nuclei ◽  
Shell Effects ◽  
Simple Tool

Evaluation of shell effects in nuclei plays an important role in studying the nuclear structure. In the Strutinsky method the smooth energy of the nucleus is obtained by a folding procedure of the single-particle (s.p.) energy density in the s.p. energy space e. An alternative way of energy smoothing is obtained by folding the s.p. energy sum in the particle-number space [Formula: see text]. For non degenerated s.p. spectra both types of folding yield smooth energies which are close to each other. In the case of strongly degenerated spectra which appear at sphericity or in regions of shape isomers, the smooth energy obtained by the [Formula: see text]-folding is a couple of MeV larger than the traditional average Strutinsky energy. It is shown that this smooth energy difference can serve as a simple tool to search for magic or quasi-magic structures in the s.p. spectra, e.g. to find shape isomers in the multidimensional deformation space.

scholarly journals Influence of Laser Vibrational Excitations of Ethylene Molecules in Laser-Assisted Combustion Diamond Synthesis

2015 ◽  
Vol 1734 ◽  
Author(s):  
L.S. Fan ◽  
Y.S. Zhou ◽  
M.X. Wang ◽  
Y. Gao ◽  
L. Liu ◽  
...  
Keyword(s):  
Vibrational Excitation ◽  
Flame Temperature ◽  
Combustion Process ◽  
Energy Coupling ◽  
Deposition Process ◽  
Resonance Excitation ◽  
Diamond Deposition ◽  
Coupling Energy ◽  
Vibrational Excitations ◽  
Coupling Path

ABSTRACTLaser-induced vibrational excitation of ethylene molecules was integrated to the CVD diamond deposition process for an in-depth understanding of the energy coupling path in chemical reactions and an alternative method to enhance the diamond deposition. On- and off-resonance excitations of ethylene molecules were achieved via tuning the incident laser wavelengths centered at 10.532 µm. With the same amount of laser power absorbed, the chemical reaction is highly accelerated with on-resonance vibrational excitation whereas energy coupling with off-resonance excitations was less efficient in influencing the combustion process. The diamond deposition rate was enhanced by a factor of 5.7 accompanied with an improvement of diamond quality index with the on-resonance excitation at 10.532 μm. The measured flame temperature demonstrated that the resonant vibrational excitation was an efficient route for coupling energy into the reactant molecules and steering the combustion process.

Systematic dependence of Grodzins product rule on NpNn

2015 ◽  
Vol 24 (05) ◽  
pp. 1550033 ◽  
Author(s):  
Parveen Kumari ◽  
H. M. Mittal
Keyword(s):  
Nuclear Structure ◽  
Product Rule ◽  
Deformed Nuclei ◽  
Major Shell ◽  
First Time ◽  
Valence Proton

The systematics of the Grodzins product rule (GPR) is studied from the perspective of the valence-proton and neutron product NpNn in the major shell space Z = 50–82, N = 82–126. The variation of nuclear structure from vibrator to deformed rotor is discussed. The Grodzins product shows more dependence on NpNn in the N ≤ 104 region, as it is a region of deformed nuclei. We present here for the first time the dependence of GPR on the NpNn product.

Conformational control over an aldehyde fragment by selective vibrational excitation of interchangeable remote antennas

2018 ◽  
Vol 54 (38) ◽  
pp. 4778-4781 ◽  
Author(s):  
A. J. Lopes Jesus ◽  
Cláudio M. Nunes ◽  
Rui Fausto ◽  
Igor Reva
Keyword(s):  
Vibrational Excitation ◽  
Conformational Control ◽  
Vibrational Excitations ◽  
Combination Modes

We apply vibrational antennas (OH or NH2 group) to achieve unprecedented conformational control over the heavy aldehyde fragment in 2-formyl-2H-azirine, using selective vibrational excitations of the OH or NH2 stretching overtones and combination modes.

Sign in / Sign up

Export Citation Format

Share Document