Low-energy dipole strength in even–even 152–164Dy isotopes within the quasiparticle random phase approximation (QRPA) including symmetry restoring interactions

Tabar, E.; Yakut, H.; Kuliev, A.A.

doi:10.1016/j.nuclphysa.2018.09.040

Cited by 13 publications

(6 citation statements)

References 46 publications

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“…In this study, the high-lying E1 excitations were systematically investigated within the TGI-QPNM in oddmass [153][154][155][156][157][158][159] Eu nuclei for the first time. The QPNM [49,50] model used for odd-mass nuclei is an upper version of the QRPA [51,52] model, which successfully explains dipole excitations in even-even deformed nuclei. However, this success is possible by the restoration of the symmetries, such as rotational, translational, and Galilean, broken due to nuclear mean-field approximations or by isolating the spurious states mixing to real dipole excitations.…”

Section: Introductionmentioning

confidence: 99%

Study of the high lying electric dipole excitations in Odd-A ^153–159Eu isotopes

et al. 2021

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In this paper, we have studied the electric dipole (E1) transitions in odd-mass 153–159Eu nuclei within Translational+Galilean Invariant Quasiparticle Phonon Nuclear Model (TGI-QPNM). Within the scope, the Giant and Pygmy Dipole Resonances (GDR and PDR) have been investigated in the energy range of 5–20 MeV. The numerical results show that the contribution of PDR and GDR to the total E1 strength is 2% and 98%, respectively. It has been found that the TGI-QPNM predicts the double hump structure and that the agreement between theoretical results and the existing experimental data is perfect, especially near the neutron binding energy Sn and the first hump of the GDR. Also the comparison of the theoretical results and the existing experimental data shows reasonable agreement for the integrated moments of the cross-sections in the GDR region. We can also deduce from the structure analysis of excited states the studied isotopes, that the GDR states can be considered to be more collective than the PDR states.

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Section: Introductionmentioning

confidence: 99%

Study of the high lying electric dipole excitations in Odd-A ^153–159Eu isotopes

et al. 2021

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“…In the calculations, the mean-field-potential was set as the axially symmetric deformed Woods-Saxon potential [59]. The isovector spin-spin interaction parameter was set as χ στ = 20/A MeV [48], while the isovector dipole-dipole interaction parameter was set to be χ 1 =300/A 5 /3 MeV•fm −2 [60]. The pairing parameters (D and l) and the mean-field deformation parameter (δ 2 ) are given in table 1.…”

Section: Resultsmentioning

confidence: 99%

“…In the employed model, by selecting suitable separable, effective isoscalar and isovector forces, the rotational invariance (RI-) was restored to describe the magnetic dipole (M1) excitations [17,[37][38][39], as well as the translational and Galilean invariance (TGI-) [9,19] for calculating the E1 excitations. This model also satisfactorily described the fragmentation of electric and magnetic dipole strength in well-deformed [40][41][42][43][44][45][46][47][48][49][50][51], transitional, and γ-soft [9,10,13,19] nuclei, as well as the giant dipole resonance and pygmy dipole resonance [40, 42-44, 46, 49, 50] in deformed nuclei [17, 37, 40-48, 52, 53].…”

Section: Introductionmentioning

confidence: 87%

“…Therefore, it can be said in the xenon isotopes, the contribution of the K=0 branches to the summed magnetic dipole strengths are less than 13%. This concurs with theoretical reviews for[124][125][126][127][128][129][130][131][132][133][134][135][136] Ba[13],[154][155][156][157][158][159][160] Gd[61],[152][153][154][155][156][157][158][159][160][161][162][163][164] Dy[48],176-180…”

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confidence: 99%

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Dipole responses in γ−soft ^124–134Xe in the spectroscopic energy region

Quliyev¹,

Guliyev²,

Kuliev³

2022

J. Phys. G: Nucl. Part. Phys.

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This study aimed to systematically investigate the low-lying dipole states of even-even 124-134Xe isotopes using the quasi-particle random phase approximation (QRPA) method. Where in all the studied xenon isotopes, electric and magnetic dipole responses were clearly predicted. The calculations predict mainly a scissors mode, while the strength of weakly deformed 132, 134Xe was small compared to moderately deformed 124-130Xe isotopes, where electric dipole excitations make their own contributions as well. The obtained results are consistent with the available experimental data. Since it was not possible to experimentally determine the parity of dipole states here trougth comparison our results with experiment, we investigated the role of electric and magnetic dipole excitations in forming the spectrum. After comparing the obtained results with the experimentally derived ones, the natures of several observed spin- and parity-unknown excitations were determined.

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“…The importance of spin-spin forces is not only limited to the description of the spin polarization effect and ground-state magnetic properties in odd-A nuclei, it is also known that the spin-dependent part of neutron-proton interactions is responsible for the Gammow-Teller β transitions between the low energy levels of the nuclei [45,46]. More importantly, the studies performed to now show that spin-spin forces have successfully explained 1+ excitations and scissor mode in even-even nuclei [47][48][49][50][51][52][53][54][55][56]. For these reasons, it is very important to determine the spin-spin interaction parameters that are the subject of this article.…”

Section: K πmentioning

confidence: 99%

Numerical Analysis of the Ground-State Magnetic Moments of ${}^{143,145,147}{\rm{Sm}}$ Isotopes

Güner

2020

Mathematical Sciences and Applications E-Notes

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The description of the ground-state magnetic properties of odd-mass nuclei is very informative in understanding of the complex structure of the deformed nuclei. The ground-state magnetic moments of most of the odd-A deformed nuclei have been measured by various experimental studies and there are numerous studies in the literature. However, many of the theoretical studies on magnetic moments and spin polarization effects affecting them are far from explaining these measured values. In this paper, the magnetic moments and effective spin g factors of 143,145,147 Sm isotopes in the lanthanides region of the periodic table were investigated within the framework of the Quasiparticle-Phonon Nuclear Model (QPNM) based on the Lagrange Multiplier Method for the first time. Spin-spin interaction parameters (χ) were determined by comparing theoretical and experimental values of magnetic moments of the related isotopes and these interactions were found to have an isovector character q = −1. It has been observed that the ground-state structures of the studied isotopes are weakly affected by quasiparticle⊗phonon interactions and the contribution of these interactions (G K0v iµ values) to the ground-state wave functions is quite small (around 0.01%). Theoretical explanation of the renormalization of spin gyromagnetic factor is one of the most important problems of nuclear structure physics. The results obtained in this study for the effective spin gyromagnetic factor g ef f. s g τ s also agree with the phenological value g ef f.s = (0.5 − 0.7)g τ s .

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Low-energy dipole strength in even–even 152–164Dy isotopes within the quasiparticle random phase approximation (QRPA) including symmetry restoring interactions

Cited by 13 publications

References 46 publications

Study of the high lying electric dipole excitations in Odd-A ^153–159Eu isotopes

Study of the high lying electric dipole excitations in Odd-A ^153–159Eu isotopes

Dipole responses in γ−soft ^124–134Xe in the spectroscopic energy region

Numerical Analysis of the Ground-State Magnetic Moments of ${}^{143,145,147}{\rm{Sm}}$ Isotopes

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Low-energy dipole strength in even–even 152–164Dy isotopes within the quasiparticle random phase approximation (QRPA) including symmetry restoring interactions

Cited by 13 publications

References 46 publications

Study of the high lying electric dipole excitations in Odd-A 153–159Eu isotopes

Study of the high lying electric dipole excitations in Odd-A 153–159Eu isotopes

Dipole responses in γ−soft 124–134Xe in the spectroscopic energy region

Numerical Analysis of the Ground-State Magnetic Moments of ${}^{143,145,147}{\rm{Sm}}$ Isotopes

Contact Info

Product

Resources

About

Study of the high lying electric dipole excitations in Odd-A ^153–159Eu isotopes

Study of the high lying electric dipole excitations in Odd-A ^153–159Eu isotopes

Dipole responses in γ−soft ^124–134Xe in the spectroscopic energy region