AN INTERPRETATION OF THE LOW-LYING EXCITED STATES OF Mg25 AND Al25

1958 ◽  
Vol 36 (3) ◽  
pp. 378-404 ◽  
Author(s):  
A. E. Litherland ◽  
H. McManus ◽  
D. A. Bromley ◽  
H. E. Gove ◽  
E. B. Paul
Keyword(s):  
Excited States ◽  
Ground State ◽  
Salient Feature ◽  
Negative Parity ◽  
State Transitions ◽  
Rotational Model ◽  
Rotational States ◽  
Γ Ray ◽  
Deuteron Stripping ◽  
Experimental Values

A description of the experimental results obtained for Mg25 and Al25 is given based upon the assumption that the excited nuclear states are rotational states. In Mg25 and Al25 members of four rotational bands can be identified. The band based on the ground state can be assigned K = 5/2 whilst the three excited-state bands, two positive parity and one negative parity, can be assigned K = 1/2. The dipole γ-ray transitions between the K = 1/2 bands and the ground state K = 5/2 band are forbidden on the rotational model and it is a salient feature of the γ-ray cascading in Mg25 and Al25 that the ground-state transitions are always amongst the weakest transitions from excited states assigned to K = 1/2 bands. Besides giving a quantitative account of the γ-ray decay of the excited states the rotational model also predicts the number and type of the bands observed. The experimental values of the Mg24(d, p)Mg25 deuteron stripping reduced widths can also be approximately predicted by the model.

scholarly journals Measurements of n?g Coincidences in the Reaction 10B (d, n?)11C

1960 ◽  
Vol 13 (2) ◽  
pp. 99 ◽  
Author(s):  
JA McDonell ◽  
DG Sargood ◽  
JR Moroney ◽  
JR Prescott
Keyword(s):  
Excited State ◽  
Excited States ◽  
Ground State ◽  
State Transitions

The energies of some neutron groups leading to low excited states of "C in the reaction lOB(d,ny)"C have been measured. These lead to values of 4�3�0�3 MeV and 6�53 � O' 02 MeV for the energies of the second and fourth excited states respectively. y-Ray spectra have also been studied in coincidence with different neutron groups. Ground state transitions were observed from the second, third, and fourth excited states, together with cascade decays of the fourth excited state through each of the second and third. Deductions from these y-ray spectra considerably reduce the number of spin possibilities which have been found for these levels by other workers.

Energies, radial expectation values, hyperfine structures of the ground state and highly excited states for C and O2+

2020 ◽  
Vol 34 (20) ◽  
pp. 2050197
Author(s):  
Chao Chen
Keyword(s):  
Excited States ◽  
Ground State ◽  
Magnetic Coupling ◽  
Wave Functions ◽  
Coupling Constants ◽  
Future Research ◽  
Expectation Values ◽  
Radiative Transitions ◽  
Experimental Values ◽  
Hyperfine Structures

The Rayleigh–Ritz variational method with multiconfiguration interaction wave functions is used to calculate energies, radiative transitions and radial expectation values of the [Formula: see text] [Formula: see text] ground state and the [Formula: see text], [Formula: see text], [Formula: see text] highly excited states of C and [Formula: see text]. Hyperfine structure parameters and magnetic coupling constants of these states are also calculated in this work. The present calculations agree well with theoretical and experimental values available in the literature. Other data not reported in the literature are expected to offer valuable benchmarks for future research.

scholarly journals Спектроскопия возбуждения фотолюминесценции массивов квантовых точек InAs/InGaAs/GaAs в температурном диапазоне 20-300 K

2020 ◽  
Vol 128 (1) ◽  
pp. 110
Author(s):  
Д.А. Рыбалко ◽  
А.М. Надточий ◽  
М.В. Максимов ◽  
А.Е. Жуков
Keyword(s):  
Quantum Dots ◽  
Excited States ◽  
Ground State ◽  
Carrier Transport ◽  
State Energy ◽  
Energy Difference ◽  
State Transitions ◽  
Photoluminescence Excitation ◽  
Spectra Analysis ◽  
Detection Energy

Detailed photoluminescence and photoluminescence excitation (PLE) studying in temperature range 20-300 K with variation of detection energy of selforganized InAs/InGaAs/GaAs quantum dots is presented in this work. PLE spectra analysis allowed us to identify two types of peaks. First type associated with excited-ground state transitions with high probability. Second corresponds to transitions from excited states to the ground state which probability is small, but significantly increased due to the effective relaxation of carriers with LO phonons. We discovered, that the QD distinctive dependence of the energy difference between peaks spectral positions corresponding to the ground and excited states on the ground state energy (i.e., on the quantum dots size) deviates as the temperature rises to 140–160 K, at which charge carrier transport between QD is activated.

Experimentelle und Quantenchemische Untersuchungen der Dipolmomente von Substituierten Stilbenen im Ersten Angercgten Singulettzustand / Experimental and Quantum Chemical Investigations of Dipole Moments of Substituted Stilbens in the First Excited Singlet State

1977 ◽  
Vol 32 (5) ◽  
pp. 420-425 ◽  
Author(s):  
A. Kawski ◽  
I. Gryczyński
Keyword(s):  
Dipole Moment ◽  
Excited States ◽  
Ground State ◽  
Quantum Chemical ◽  
Singlet State ◽  
Dipole Moments ◽  
Excited Singlet State ◽  
Excited Singlet ◽  
Fluorescent State ◽  
Experimental Values

Abstract The values a/a3 (α = polarizability), the Onsager cavity radii a and the dipole moments μe of six substituted stilbens in the fluorescent state have been determined. It is shown that if the dipole moment of the lowest excited singlet state μe is parallel to the dipole moment in the ground state μg, the values of μe and a can be determined from the solvent effects. Moreover, quantum chemical investigations of the dipole moments in the ground and excited states were carried out with the Pariser-Parr-Pople method and compared with the experimental values.

scholarly journals Study of parity-doublet structure in the 147La nucleus

2018 ◽  
Vol 193 ◽  
pp. 05006
Author(s):  
J. Wiśniewski ◽  
W. Urban ◽  
T. Rząca-Urban ◽  
A. G. Smith ◽  
J. F. Smith ◽  
...  
Keyword(s):  
Excited States ◽  
Ground State ◽  
Spontaneous Fission ◽  
Parity Doublet ◽  
Excitation Scheme ◽  
Spin Parity ◽  
Octupole Deformation ◽  
Doublet Structure ◽  
Γ Ray ◽  
Recent Evaluation

The work reports several new excited states in the neutron-rich 147La nucleus, populated in spontaneous fission of 252Cf. The excitation scheme has been reinvestigated by means of γ-ray spectroscopy, using high-fold γ coincidences measured with the Gammasphere array of Ge detectors. It is shown that the 229.65-keV level has spin and parity 11/2-, which changes the 9/2- spin-parity reported in a recent evaluation and sets up the spinparity of the ground state as 5/2+. New levels allow to arrange the excitation scheme of 147La into a parity-doublet-like structure showing that the 147La nucleus may have an octupole deformation.

SYSTEMATIC STUDY OF THE MANY-PARTICLE AND MANY-HOLE STATES IN AND AROUND THE ISLAND OF INVERSION

2011 ◽  
Vol 20 (04) ◽  
pp. 893-896 ◽  
Author(s):  
MASAAKI KIMURA
Keyword(s):  
Molecular Dynamics ◽  
Excitation Energy ◽  
Excited States ◽  
Systematic Study ◽  
Ground State ◽  
Negative Parity ◽  
Parity Assignment ◽  
Island Of Inversion ◽  
The Many

Deformation and many particle and many hole configurations in the island of inversion are investigated with Antisymmetrized Molecular Dynamics (AMD). The result suggests the coexistence of many particle and many hole configurations with different deformation at small excitation energy. In the case of 33 Mg , we suggest the negative-parity assignment for the ground state. Other particle hole configurations are predicted as the excited states.

Comparison between the ground state transitions of the sub-Coulomb deuteron stripping reactions on 6Li

1997 ◽  
Vol 621 (1-2) ◽  
pp. 119-122 ◽  
Author(s):  
K. Czerski ◽  
G. Ruprecht ◽  
H. Bucka ◽  
P. Heide
Keyword(s):  
Ground State ◽  
State Transitions ◽  
Deuteron Stripping

NEW 5− AND 6+ STATES IN Ne20

1964 ◽  
Vol 42 (3) ◽  
pp. 477-488 ◽  
Author(s):  
J. A. Kuehner ◽  
J. D. Pearson
Keyword(s):  
Excited States ◽  
Rotational Band ◽  
Ground State ◽  
Negative Parity ◽  
Alpha Particles ◽  
Excitation Energies ◽  
Angular Correlations ◽  
Fourth Member

Excited states of Ne20 at excitation energies of 8.46 Mev and 8.79 Mev have been identified and assigned spin and parity values of 5− and 6+, respectively. The excited states were produced in the C12(C12, α)Ne10 reaction and the spin assignments were made on the basis of angular correlations of the decay alpha particles from these states leaving O16 in its ground state. It is postulated that the 5− state is the fourth member of a K = 2 negative-parity rotational band based on the 2– 4.97-Mev state and that the 6+ state is the fourth member of a K = 0 rotational band based on the 0+ ground state of Ne20.

GLOBAL TRENDS IN THE LOWEST POSITIVE- AND NEGATIVE-PARITY LEVELS OF p- AND sd-SHELL NUCLEI

2005 ◽  
Vol 14 (06) ◽  
pp. 845-881 ◽  
Author(s):  
P. O. HESS ◽  
G. LÉVAI
Keyword(s):  
Systematic Study ◽  
Ground State ◽  
Pauli Principle ◽  
Energy Difference ◽  
Negative Parity ◽  
Quadrupole Moments ◽  
Opposite Parity ◽  
Global Trends ◽  
Global Properties ◽  
Experimental Values

A schematic but systematic study is presented for p- and sd-shell nuclei to investigate the position of the first opposite-parity state relative to the ground state. This approach rests on the assumption that a probe using a dominant quadrupole-quadrupole interaction and observing the Pauli principle is sufficient to trace qualitatively the position of these states. It is argued that even if the SU (3) symmetry is broken, the lowest states in each shell have contributions from the dominant SU (3) states only, and therefore their relative energies are not influenced significantly by the mixing. It is shown that the global properties and trends of the above-mentioned energy difference are governed by the allowed SU (3) configurations including a pronounced odd-even staggering effect. In some regions, strongly prolate 2ℏω states are found to appear at energies comparable to that of 0ℏω states, indicating that in realistic calculations mixing to excited configurations might become important, and this can explain the anomalous properties of some neutron-rich nuclei. An analysis of the available quadrupole moments is also presented, and a qualitative agreement between calculated and experimental values is found.

DISINTEGRATION OF Au198

1954 ◽  
Vol 32 (2) ◽  
pp. 153-166 ◽  
Author(s):  
L. G. Elliott ◽  
J. L. Wolfson ◽  
M. A. Preston
Keyword(s):  
Excited States ◽  
Magnetic Dipole ◽  
Ground State ◽  
Conversion Coefficient ◽  
Electric Quadrupole ◽  
Β Decay ◽  
Third Order ◽  
Decay Interaction ◽  
Forbidden Transition ◽  
Γ Ray

In addition to the 411.77 kev. γ-ray transition, two γ-ray transitions of energies 676.5 ± 0.8 kev. and 1088.9 ± 0.9 kev. have been observed in Hg198 following the disintegration of Au198. The intensities of these transitions were found to be (8.20 ± 0.56) × 10−3 and (1.63 ± 0.12) × 10−3 per disintegration respectively. The K conversion coefficient of the 676.5 kev. transition was measured as 0.0224 ± 0.0019, identifying the radiation as a mixture of magnetic dipole and electric quadrupole. The K conversion coefficient of the 1088.9 kev. transition was measured as 0.00450 ± 0.00034, identifying this radiation as electric quadrupole.A β-transition to the ground state of Hg198, of energy 1371 kev. and intensity (2.5 ± 0.5) × 10−4 per disintegration, has been observed and identified as a third order forbidden, transition. The shape of this spectrum has been studied above the end point of the intense 959 kev. β-transition. Of the four combinations considered for the β-decay interaction form, viz. SA, VA, ST, VT, it was found that the experimental shape can be fitted by any one of VA, ST, or VT, but not by SA. The log f0 t value for the transition is 11.7.A disintegration scheme is proposed in which the excited states of Hg198 at 412 and 1089 kev. are each assigned spin 2 and even parity and the ground state of Au198 spin 3 and odd parity.

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