105Tc nuclear structure and systematic evolution of states of 1/2+[431] intruder band in odd-A 95, 97,99,101,103,105,107Tc isotopes

2020 ◽  
Author(s):  
Sadek ZEGHIB
Keyword(s):  
Experimental Investigation ◽  
Fermi Level ◽  
Nuclear Structure ◽  
Rotational Model ◽  
Model Calculations ◽  
Rotational Bands ◽  
Systematic Evolution ◽  
Intruder Orbital ◽  
Model Transition ◽  
Rotor Model

Previously observed negative and positive parity states of <sup>105</sup>Tc were studied in the framework of particle-rotor model. Transition properties and experimental energies were compared to the predictions of the model calculations. A systematic study of the evolution of the intruder π1/2+[413] band in the nuclear structure of odd-A Technetium isotopes <sup>95,97,99,101,103,105,107</sup>Tc is presented as well. The existence of this intruder band has been argued previously in <sup>95,97,99,101,103</sup>Tc isotopes (partially populated) and fully observed and confirmed in <sup>105</sup>Tc. It will be shown that changes in deformation and subsequently the position of Fermi level vis a vis the 1/2+[431] intruder orbital originating from the π (d<sub>5/2</sub>, g<sub>7/2</sub>) subshells predominantly affect these systematic changes. All four interpreted experimental rotational bands are naturally predicted by the rotational model as bands build on states of good Ω originating from 5/2+[422], 5/2-[303], 3/2-[301] and 1/2+[431] orbitals near the Fermi level in deformed <sup>105</sup>Tc (strong coupling). Further experimental investigation about missing data is needed for those observed low lying states in both <sup>105</sup>Tc and <sup>103</sup>Tc in order to confirm the presence of the 1/2-[301] rotational band that is well defined in lighter <sup>95,97,99,101</sup>Tc isotopes.

103Tc nuclear structure and systematic evolution of states of g9/2 parentage in odd-A 95, 97, 99, 101, 103Tc isotopes

2015 ◽  
Vol 93 (8) ◽  
pp. 862-870
Author(s):  
Sadek Zeghib
Keyword(s):  
Fermi Level ◽  
Nuclear Structure ◽  
Strong Coupling ◽  
Systematic Study ◽  
Negative Parity ◽  
Model Calculations ◽  
Rotational Bands ◽  
Complete Study ◽  
Systematic Evolution ◽  
Rotor Model

A systematic study of the evolution of the nuclear structure (at low and medium energies) of odd-A 95–103Tc isotopes is presented. These changes are indeed affected predominantly by changes in deformation and subsequently the position of the Fermi level. Hence a complete study of previously observed positive and negative parity states (at low and medium energies) of 103Tc in the framework of the particle–rotor model is performed. Experimental energies and transition properties will be compared to those predicted by the model calculations. The systematic model calculations show that those rotational “multiplets” emerging as a result of the larger Coriolis mixing, especially among positive-parity Nilsson states of g9/2 parentage in less deformed isotopes 95, 97, 99, 101Tc, are just as natural a prediction of the model as rotational bands built on states of good Ω in well deformed 103Tc (strong coupling) as confirmed experimentally.

Branching Ratios and Lifetimes of 25Mg Levels below 5.2 MeV

1974 ◽  
Vol 52 (23) ◽  
pp. 2329-2342 ◽  
Author(s):  
R. W. Ollerhead ◽  
D. C. Kean ◽  
R. M. Gorman ◽  
M. B. Thomson
Keyword(s):  
Doppler Shift ◽  
Gamma Ray ◽  
Branching Ratios ◽  
Surface Barrier ◽  
Surface Barrier Detector ◽  
Rotational Model ◽  
Rotational Bands ◽  
Barrier Detector ◽  
Combined Data

All levels below 5.2 MeV in 25Mg have been studied using the reaction 25Mg(p, p′γ). In-elastically scattered protons were detected in an annular surface barrier detector located at 180°; coincidence gamma-ray spectra were obtained at Ge (Li) detector angles of 90°, 45°, and 135°. Level energies were determined from unshifted gamma-ray energies recorded in the 90° spectra. Lifetimes were obtained from the attenuated Doppler shift of gamma-ray energies recorded in spectra taken at forward and backward angles. Branching ratios were deduced from the combined data of all three angles. The identification of levels as members of rotational bands is discussed, and transition strengths deduced from the present measurements are compared with predictions of the simple rotational model.

scholarly journals Parity partner bands in 163Lu: A novel approach for describing the negative parity states from a triaxial super-deformed band

2021 ◽  
pp. 2150033
Author(s):  
R. Poenaru ◽  
A. A. Raduta
Keyword(s):  
Band Structure ◽  
Present Model ◽  
Negative Parity ◽  
Rotational Bands ◽  
Parity Partner ◽  
Quantum Numbers ◽  
Novel Approach ◽  
Rotor Model ◽  
Classical Picture

The wobbling spectrum of [Formula: see text]Lu is described through a novel approach, starting from a triaxial rotor model within a semi-classical picture, and obtaining a new set of equations for all four rotational bands that have wobbling character. Redefining the band structure in the present model is done by adopting the concepts of Signature Partner Bands and Parity Partner Bands. Indeed, describing a wobbling spectrum in an even–odd nucleus through signature and parity quantum numbers is an inedited interpretation of the triaxial super-deformed bands.

scholarly journals Nuclear structure of Ge76 from inelastic neutron scattering measurements and shell model calculations

2017 ◽  
Vol 95 (1) ◽  
Author(s):  
S. Mukhopadhyay ◽  
B. P. Crider ◽  
B. A. Brown ◽  
S. F. Ashley ◽  
A. Chakraborty ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Shell Model ◽  
Nuclear Structure ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Model Calculations ◽  
Scattering Measurements

Application of the Amphoteric Native Defect Model to Diffusion and Activation of Shallow Impurities in III-V Semiconductors

1993 ◽  
Vol 300 ◽  
Author(s):  
W. Walukiewicz
Keyword(s):  
Fermi Level ◽  
Defect Formation ◽  
Doped Semiconductors ◽  
Model Calculations ◽  
Impurity Atoms ◽  
Dependent Part ◽  
Localized Defects ◽  
Shallow Impurities ◽  
And Diffusion ◽  
Lattice Matched

ABSTRACTThe effects of heavy doping on the formation of charged point defects are considered. It is shown that the Fermi level dependent part of the formation energy of highly localized defects can be determined using a universal energy reference, common to all III-V compound semiconductors. The concept is used to analyze the electrical activity and diffusion of dopant impurities in these compounds. We present model calculations which explain the correlation between the maximum hole concentrations and the acceptor impurity diffusion in InP and in InGaAs alloys, doped with group II acceptors. The calculations account for the redistribution of the impurity atoms at the lattice matched InP/InGaAs interface. It is also demonstrated that an abrupt enhancement of the Fermi level induced defect formation is observed at the onset of highly degenerate statistics in heavily doped semiconductors.

Branching Ratios and Lifetimes of 25Mg Levels between 5.2 and 6.1 MeV

1975 ◽  
Vol 53 (2) ◽  
pp. 123-132 ◽  
Author(s):  
R. W. Ollerhead ◽  
D. C. Kean ◽  
S. G. T. Leong ◽  
C. Doekes ◽  
T. M. R. Meadley
Keyword(s):  
Gamma Ray ◽  
Branching Ratios ◽  
Surface Barrier ◽  
Surface Barrier Detector ◽  
Ground State Band ◽  
Rotational Model ◽  
Rotational Bands ◽  
Barrier Detector ◽  
State Band ◽  
Combined Data

All levels between 5.2 and 6.1 MeV in 25Mg have been studied using the reaction 25Mg(p,p′γ). Inelastically scattered protons were detected in an annular surface barrier detector located at 180°; coincidence gamma-ray spectra were obtained at Ge(Li) detector angles of 90, 45, and 135°. Level energies were determined from unshifted gamma-ray energies recorded in the 90° spectra. Lifetimes were obtained from the attenuated Doppler shift of gamma-ray energies recorded in spectra taken at forward and backward angles. Branching ratios were deduced from the combined data of all three angles. The identification of levels as members of rotational bands is discussed, and transition strengths deduced from the present measurements are compared with predictions of the simple rotational model. In particular, evidence is presented for the identification of a level at 5535 keV as the 11/2 member of the ground state band, levels at 5522 and 5794 keV as the 5/2 and 11/2 members of the Kπ = 1/2− band, and a level at 6040 keV as the 11/2 member of a Kπ = 9/2+ band.

Fusion dynamics of stable and weakly bound colliding systems

2017 ◽  
Vol 26 (10) ◽  
pp. 1750063 ◽  
Author(s):  
Manjeet Singh Gautam
Keyword(s):  
Nuclear Structure ◽  
Degrees Of Freedom ◽  
Theoretical Calculations ◽  
Spherical Shape ◽  
Weakly Bound ◽  
Model Calculations ◽  
Rotational States ◽  
Fusion Data ◽  
Breakup Channel ◽  
Coupled Channel

This work systematically analyzed the fusion dynamics of the projectile-target combinations involving stable and loosely bound systems within the view of the energy-dependent Woods–Saxon potential model (EDWSP model) and the coupled channel approach. The different projectiles are bombarded onto series of Sm-isotopes, which possess the dominance of the different kinds of the nuclear structure degrees of freedom and with the increase of the neutron richness, the Sm-isotopes gradually shift from spherical shape to a statically deformed shape. In the fusion of [Formula: see text] reaction, the impacts of vibrational degrees of freedom of the colliding nuclei are dominant while in the case of [Formula: see text] systems, the rotational states of the deformed target isotopes have a strong impression on the below-barrier fusion data. The heavier target isotopes ([Formula: see text] also exhibit the higher order deformation such as [Formula: see text], [Formula: see text]-deformation parameter in its ground state and couplings to such channels must be incorporated in theoretical calculations in order to achieve close agreement with the sub-barrier fusion data. However, in the case of the loosely bound systems, the projectile breakup channel significantly affects the fusion excitation functions in the domain of the Coulomb barrier. To ensure the role of the projectile breakup channel, the fusion of the different loosely bound projectiles ([Formula: see text] and [Formula: see text] with Sm-isotopes are investigated, wherein the above-barrier fusion data of these reactions are suppressed with reference to the coupled channel calculations. This hindrance is the result of the projectile breakup effects that occur as a consequence of the breakup of the projectile before reaching the fusion barrier due to its low binding energy. However, in the EDWSP model calculations the magnitude of the hindrance of the above-barrier fusion data of [Formula: see text] and [Formula: see text] reactions is reduced by a factor varying from 7% to 13% with respect to a value reported in the literature. In contrast to this, the sub-barrier fusion enhancement of [Formula: see text] and [Formula: see text] reactions is the result of the dominance of the nuclear structure degrees of freedom of the colliding systems.

scholarly journals SIGNATURE SPLITTING IN 173W WITH TRIAXIAL PARTICLE ROTOR MODEL

2009 ◽  
Vol 18 (01) ◽  
pp. 109-122 ◽  
Author(s):  
B. QI ◽  
S. Q. ZHANG ◽  
S. Y. WANG ◽  
J. MENG
Keyword(s):  
Excellent Agreement ◽  
Degree Of Freedom ◽  
The Self ◽  
Energy Spectra ◽  
Signature Splitting ◽  
Signature Inversion ◽  
Self Consistent ◽  
Strong Competition ◽  
Intruder Orbital ◽  
Rotor Model

A particle rotor model with a quasi-neutron coupled with a triaxially deformed rotor is applied to study signature splitting for bands with intruder orbital ν7/2+[633] and nonintruder orbital ν5/2-[512] in 173 W . Excellent agreement with the observed energy spectra has been achieved for both bands. Signature splitting for band ν7/2+[633], and band ν5/2-[512] before the onset of signature inversion, is satisfactorily reproduced by introducing the γ degree of freedom. The phase and amplitude of signature splitting in band ν5/2-[512] are attributed to strong competition between 2f7/2 and 1h9/2 components. However, the self-consistent explanation of signature inversion in band ν5/2-[512] is beyond the present one quasi-neutron coupled with a triaxially deformed rotor.

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