Shape evolutions in the neutron-rich Ru isotopes

Faisal, J. Q; Hua, H.; Li, X. Q.; Shi, Yue; Fang, Xu; Liu, H. L.; Ye, Y. L.; Jiang, D. X.

doi:10.1103/physrevc.82.014321

Cited by 13 publications

(5 citation statements)

References 22 publications

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“…The quadrupole deformations β 2 in the aligned bands are predicted to be reduced, but the shapes remain strongly triaxial. This result confirms predictions of an earlier works [7,31] based on the cranked macroscopic-microscopic method with the Woods-Saxon average potential. The decrease of the corresponding transition quadrupole moments above ω ∼ 0.3 MeV reflects the change in β 2 and γ due to the q.p.…”

Section: Discussionsupporting

confidence: 91%

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Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

et al. 2015

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Background: Whether atomic nuclei can possess triaxial shapes at their ground states is still a subject of ongoing debate. According to theory, good prospects for low-spin triaxiality are in the neutron-rich Mo-Ru region. Recently, transition quadrupole moments in rotational bands of even-mass neutron-rich isotopes of molybdenum and ruthenium nuclei have been measured. The new data have provided a challenge for theoretical descriptions invoking stable triaxial deformations.Purpose: To understand experimental data on rotational bands in the neutron-rich Mo-Ru region, we carried out theoretical analysis of moments of inertia, shapes, and transition quadrupole moments of neutron-rich even-even nuclei around 110 Ru using self-consistent mean-field and shell model techniques.Methods: To describe yrast structures in Mo and Ru isotopes, we use nuclear Density Functional Theory (DFT) with the optimized energy density functional UNEDF0. We also apply Triaxial Projected Shell Model (TPSM) to describe yrast and positive-parity, near-yrast band structures.Results: Our self-consistent DFT calculations predict triaxial ground-state deformations in 106,108 Mo and 108.110,112 Ru and reproduce the observed low-frequency behavior of moments of inertia. As the rotational frequency increases, a negative-γ structure, associated with the aligned ν(h 11/2 ) 2 pair, becomes energetically favored. The computed transition quadrupole moments vary with angular momentum, which reflects deformation changes with rotation; those variations are consistent with experiment. The TPSM calculations explain the observed band structures assuming stable triaxial shapes. Conclusions:The structure of neutron-rich even-even nuclei around 110 Ru is consistent with triaxial shape deformations. Our DFT and TPSM frameworks provide a consistent and complementary description of experimental data.

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Section: Discussionsupporting

confidence: 91%

“…Collective rotation has been shown to enhance triaxial minima in even-even Mo and Ru isotopes [7,30,31]. For that reason, those nuclei are candidates for the presence of novel collective modes associated with triaxial rotation, such as wobbling motion and chiral bands [8,9].…”

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confidence: 99%

Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

et al. 2015

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“…This is consistent with the observation of both experiment and theory in even-odd Ru (one proton less than Rh) that the triaxial oblate shape appears at N = 67 [25]. The authors in Ref.…”

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confidence: 80%

“…The authors in Ref. [25] also provide experimental and theoretical evidence for a triaxial prolate to triaxial oblate shape transition at N = 68 in eveneven Ru. A recent work on β-and γ-coincidence spectroscopy of 111 Tc (Z = 43 and N = 68) [26] shows that an assumption of a triaxial oblate deformation is required in the quasi-particle-rotor-model calculations to interpret low-lying states with K = 1/2 + and 5/2 + .…”

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New high-spin level scheme of neutron-rich112Rh

et al. 2013

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“…In the last decade, QPTs in nuclei have attracted a lot of attention both in theory and experiment [72][73][74][75][76]. Meanwhile, several Chinese groups have published their results on this subject too [77][78][79][80][81][82][83][84][85][86][87].…”

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confidence: 99%

Recent progress in theoretical studies of nuclear magnetic moments

Zhao

2012

Chin. Sci. Bull.

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Nuclear magnetic moment is highly sensitive to the underlying structure of atomic nuclei and therefore serves as a stringent test of nuclear models. The advanced nuclear structure models have been successful in analyzing many nuclear structure properties, but they still cannot provide a satisfactory description of nuclear magnetic moments. Recently attempts to summarize the present understanding on nuclear magnetic moments in both relativistic and non-relativistic theoretical models have been made. The detailed contents are covered in the issue entitled "Nuclear magnetic moments and related topics" (in Sci China Phys Mech Astron, Vol. 54, No. 2, 2011). In this paper some of the related achievements will be highlighted. nuclear magnetic moments, status and progress, relativistic and non-relativistic many-body models Citation: Zhao E G. Recent progress in theoretical studies of nuclear magnetic moments. Chin Sci Bull, 2012Bull, , 57: 4394-4399, doi: 10.1007 Nuclear magnetic moment is an important physical observable that reflects the interplay between collective and singleparticle degrees of freedom in atomic nuclei. It therefore provides a stringent test of various nuclear structure models. A concise but interesting history and present understanding of nuclear magnetic moments have been provided in [1].Since the successes of the nuclear shell model established in 1949 by Mayer and Jensen for the explanation of the magic numbers (Z or N = 2, 8, 20, 28, 50, 82, . . . ), the understanding of the magnetic moment of an odd-A nucleus has been done in the extreme single-particle picture which leads to the well known Schmidt values [2]. It was observed in the early 1950s [3], however, that almost all nuclear magnetic moments are sandwiched between the two Schmidt lines.The pion, predicted by Yukawa in 1935, and discovered experimentally by Powell in 1947, was pointed out to be very important for understanding nuclear magnetic moments by Miyazawa in 1951 [4] and by Villars in 1952 [5] via the one-pion exchange currents, which can be understood as a medium correction in comparison with the free nuclear magnetic moments. Besides the pion effect, the first-order configuration mixing was pointed out to be also important in the email: egzhao@mail.itp.ac.cn odd-A nuclei with a j j-closed core by Arima and Horie in 1954 [6,7]. This effect is also called the first-order core polarization or Arima-Horie effect. However, for the nuclei with a LS -closed core ± 1 nucleon, the first-order configuration mixing does not contribute to nuclear magnetic moments. In order to understand the difference between Schmidt values and experiment data in this type of nuclei, it was realized that one has to take into account the second-order configuration mixing, which is also called the tensor correlation. The isoscalar magnetic moments provide us the best evidence of the tensor correlations. There were also lots of discussion on whether the Δ-hole mixing can explain the magnetic moments [8][9][10].In the past decades, covariant density functio...

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Shape evolutions in the neutron-rich Ru isotopes

Cited by 13 publications

References 22 publications

Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

New high-spin level scheme of neutron-rich112Rh

Recent progress in theoretical studies of nuclear magnetic moments

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