The low-energy dipole structure of 232Th , 236U and 238U actinide nuclei

Kuliev, A.A.; Guliyev, E.; Ertuğral, F.; Özkan, Sinan Serdar

doi:10.1140/epja/i2010-10933-y

Cited by 51 publications

(56 citation statements)

References 42 publications

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“…Therefore, the macroscopic picture of oscillating scissors blades is rather oversimplified. Recent quasiparticle random phase approximation (QRPA) calculations [11,12] are generally in agreement with the observed energies of the scissors states and strengths observed in (γ , γ ) and (e,e ) reactions.…”

Section: Introductionsupporting

confidence: 73%

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Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes

et al. 2014

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The γ -ray strength function in the quasicontinuum has been measured for [231][232][233] 232,233 Pa, and 237-239 U using the Oslo method. All eight nuclei show a pronounced increase in γ strength at ω SR ≈ 2.4 MeV, which is interpreted as the low-energy M1 scissors resonance (SR). The total strength is found to be B SR = 9-11 μ 2 N when integrated over the 1-4 MeV γ -energy region. The SR displays a double-hump structure that is theoretically not understood. Our results are compared with data from (γ , γ ) experiments and theoretical sum-rule estimates for a nuclear rigid-body moment of inertia.

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Section: Introductionsupporting

confidence: 73%

“…It is interesting to investigate the most important singleparticle orbitals responsible for the SR in the QRPA calculations [12]. urations, respectively.…”

Section: -7mentioning

confidence: 99%

Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes

et al. 2014

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“…It is found that the main part (∼ 60%) of the spurious state is spread over many levels in the energy interval between 7.5 MeV and 9 MeV with the largest admixtures being situated in the region of energy spacing between nuclear shells 1 ω However, it should be noted that the effects of the translational invariance and isolation of c.m spurious motion in the low lying E1 dipole excitations below 6 MeV are relatively small (admixtures of the spurious state is about 1 to 2%) in nuclei and weakly independent on the mass number Refs. [33,34] value as a function of the excitation energy are shown on the left and right side of the figure, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Also it is well known that the models which use the Hamiltonian with broken translational or rotational symmetry strongly overestimate the E1 and M1 strength, respectively [30][31][32][33][34]. Thus taking into account the translational and rotational invariance for separation of the zero energy spurious solutions, is important for a correct description of the 1 + and 1…”

mentioning

confidence: 99%

Electric dipole strength distribution below the E1 giant resonance in N = 82 nuclei

2010

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Abstract:In this study quasiparticle random-phase approximation with the translational invariant Hamiltonian using deformed mean field potential has been conducted to describe electric dipole excitations in 136 Xe, 138 Ba, 140 Ce, 142 Nd, 144 Sm and 146 Gd isotones. The distribution of the calculated E1 strength shows a resonance like structure at energies between 6-8 MeV exhausting up to 1% of the isovector electric dipole Energy Weighted Sum Rule and in some aspects nicely confirms the experimental data. It has been shown that the main part of E1 strength, observed below the threshold in these nuclei may be interpreted as main fragments of the Pygmy Dipole resonance. The agreement between calculated mean excitation energies as well as summed B(E1) value of the 1 − excitations and the available experimental data is quite good. The calculations indicate the presence of a few prominent positive parity 1 + States in heavy N = 82 isotones in the energy interval 6-8 MeV which shows not all dipole excitations were of electric character in this energy range.

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“…of this configuration for the neutron and proton, as was pointed out by Hisatake [4], are identified as 3/2 and 5/2, respectively. The determination of the Nilsson quantum numbers of ground state of the odd-odd 138,140 Pr nuclei will serve as a basis for calculating various characteristics such as beta decay [11], magnetic moment [12][13][14][15][16] and magnetic dipole transitions [17][18][19][20][21][22][23] of even and odd mass nuclei.…”

Section: Expected Ground State Configuration For 140 Prmentioning

confidence: 99%

The Ground State Nilsson Quantum Numbers of the Odd-Odd^138,140Pr Nuclei

et al. 2016

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In this work, we have determined the Nilsson quantum numbers of the ground state of the odd-odd 138,140 Pr nucleus for the first time. To achieve it, several low energy neutron-proton two quasiparticle levels have been calculated in 138,140 Pr nuclei using deformed Woods-Saxon potential basis. The Gamov-Teller β (+) decay transition matrix elements from these levels to the ground state of the neighbor 138,140 Ce nuclei and log f t values have been calculated. From the comparison of theoretical and experimental log f t values and neutron-proton K quantum numbers the ground state Nilsson quantum numbers of the odd-odd isotopes have been determined as {n [402]3/2− p[413]5/2} 1 + for two isotopes.

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The low-energy dipole structure of 232Th , 236U and 238U actinide nuclei

Cited by 51 publications

References 42 publications

Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes

Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes

Electric dipole strength distribution below the E1 giant resonance in N = 82 nuclei

The Ground State Nilsson Quantum Numbers of the Odd-Odd^138,140Pr Nuclei

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The low-energy dipole structure of 232Th , 236U and 238U actinide nuclei

Cited by 51 publications

References 42 publications

Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes

Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes

Electric dipole strength distribution below the E1 giant resonance in N = 82 nuclei

The Ground State Nilsson Quantum Numbers of the Odd-Odd138,140Pr Nuclei

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The Ground State Nilsson Quantum Numbers of the Odd-Odd^138,140Pr Nuclei