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17 results on '"L. Msebi"'

1. First observation of the coexistence of multiple chiral doublet bands and pseudospin doublet bands in the A ≈ 80 mass region

Author

L. Mu, S.Y. Wang, C. Liu, B. Qi, R.A. Bark, J. Meng, S.Q. Zhang, P. Jones, S.M. Wyngaardt, H. Jia, Q.B. Chen, Z.Q. Li, S. Wang, D.P. Sun, R.J. Guo, X.C. Han, W.Z. Xu, X. Xiao, P.Y. Zhu, H.W. Li, H. Hua, X.Q. Li, C.G. Li, R. Han, B.H. Sun, L.H. Zhu, T.D. Bucher, B.V. Kheswa, N. Khumalo, E.A. Lawrie, J.J. Lawrie, K.L. Malatji, L. Msebi, J. Ndayishimye, J.F. Sharpey-Schafer, O. Shirinda, M. Wiedeking, T. Dinoko, and S.S. Ntshangase

Subjects
High-spin states, Chiral doublet bands, Pseudospin doublet, Covariant density functional theory, Particle rotor model, 81Kr, Physics, QC1-999
Abstract

Two nearly degenerate positive-parity bands with the πg9/22⊗νg9/2−1 configuration and three nearly degenerate negative-parity bands with the πg9/2(p3/2,f5/2)⊗νg9/2−1 configuration have been identified in 81Kr. They are interpreted as chiral doublet bands and pseudospin-chiral triplet bands, which is supported by the constrained covariant density functional theory and the multiparticle plus rotor model calculations. The present work reports two new chiral configurations πg9/22⊗νg9/2−1 and πg9/2(p3/2,f5/2)⊗νg9/2−1, and the first example of pseudospin-chiral triplet bands involving the π(p3/2,f5/2) pseudospin doublet.

Published
2022
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3. Collective rotational bands at low excitation energy in Os186 : Vibrational and rotational degrees of freedom

Author

L. Mdletshe, X. Q. Yang, E. A. Lawrie, M. A. Sithole, S. N. T. Majola, S. S. Ntshangase, J. F. Sharpey-Schafer, J. J. Lawrie, S. H. Mthembu, T. D. Bucher, L. Msebi, R. A. Bark, A. A. Avaa, M. V. Chisapi, P. Jones, S. Jongile, Z. P. Li, L. Makhathini, K. L. Malatji, A. A. Netshiya, Z. Shi, B. Y. Song, L. Wang, J. Xiang, and S. Q. Zhang

Published
2022
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4. First observation of the coexistence of multiple chiral doublet bands and pseudospin doublet bands in the ≈ 80 Mass Region

Author

L. Mu, S.Y. Wang, C. Liu, B. Qi, R.A. Bark, J. Meng, S.Q. Zhang, P. Jones, S.M. Wyngaardt, H. Jia, Q.B. Chen, Z.Q. Li, S. Wang, D.P. Sun, R.J. Guo, X.C. Han, W.Z. Xu, X. Xiao, P.Y. Zhu, H.W. Li, H. Hua, X.Q. Li, C.G. Li, R. Han, B.H. Sun, L.H. Zhu, T.D. Bucher, B.V. Kheswa, N. Khumalo, E.A. Lawrie, J.J. Lawrie, K.L. Malatji, L. Msebi, J. Ndayishimye, J.F. Sharpey-Schafer, O. Shirinda, M. Wiedeking, T. Dinoko, and S.S. Ntshangase

Subjects
Nuclear and High Energy Physics
Abstract

Two nearly degenerate positive-parity bands with the πg9/22⊗νg9/2−1 configuration and three nearly degenerate negative-parity bands with the πg9/2(p3/2,f5/2)⊗νg9/2−1 configuration have been identified in $^{81}$Kr. They are interpreted as chiral doublet bands and pseudospin-chiral triplet bands, which is supported by the constrained covariant density functional theory and the multiparticle plus rotor model calculations. The present work reports two new chiral configurations πg9/22⊗νg9/2−1 and πg9/2(p3/2,f5/2)⊗νg9/2−1, and the first example of pseudospin-chiral triplet bands involving the π(p3/2,f5/2) pseudospin doublet.

Published
2022

5. Collective structures in Cu62

Author

D. W. Luo, C. Xu, Y. K. Wang, Z. H. Li, R. A. Bark, S. Q. Zhang, H. Hua, S. Y. Wang, J. Peng, X. Q. Li, H. Y. Wu, X. Wang, C. G. Wu, Q. T. Li, J. Lin, Y. Jin, W. Z. Xu, L. Mu, J. Meng, F. R. Xu, Y. L. Ye, D. X. Jiang, P. Jones, E. A. Lawrie, P. Papka, M. F. Nkalanga, T. D. Bucher, M. V. Chisapi, L. Msebi, S. Jongile, S. Ntshangase, B. R. Zikhali, S. H. Mthembu, T. Seakamela, M. A. Sithole, O. Shirihda, A. A. Aava, L. Mdletshe, K. L. Malatji, S. Mhlongo, and L. Makhathini

Published
2022
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6. Signature splitting of the g7/2[404]7/2+ bands in Ba131 and Ce133

Author

B. Ding, C. M. Petrache, S. Guo, E. A. Lawrie, I. Wakudyanaye, Z. H. Zhang, H. L. Wang, H. Y. Meng, D. Mengoni, Y. H. Qiang, J. G. Wang, C. Andreoiu, A. Astier, A. Avaa, T. Bäck, R. A. Bark, D. Bazzacco, A. Boso, T. D. Bucher, B. Cederwall, M. V. Chisapi, H. L. Fan, F. Galtarossa, F. H. Garcia, A. Goasduff, G. Jaworski, P. Jones, I. Kuti, J. J. Lawrie, G. S. Li, R. Li, M. L. Liu, Z. Liu, B. Lomberg, B. F. Lv, T. Marchlewski, L. Mdletshe, L. Msebi, S. H. Mthembu, D. R. Napoli, A. Netshiya, M. F. Nkalanga, J. N. Orce, K. Ortner, F. Recchia, S. Riccetto, A. Rohilla, T. W. Seakamela, M. Siciliano, M. A. Sithole, D. Sohler, J. Srebrny, D. Testov, A. Tucholski, J. J. Valiente-Dobón, F. Wentzel, K. Whitmore, Y. H. Zhang, K. K. Zheng, X. H. Zhou, and B. R. Zikhali

Subjects
010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published
2021
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7. Structure of collective states built on the 11/2+ isomer in Os187 : Quasiparticle-plus-triaxial-rotor model and interpretation as tilted-precession bands

Author

E. A. Lawrie, L. Makhathini, B. R. Zikhali, B. Maqabuka, S. N. T. Majola, Peter B. Jones, T. D. Bucher, G. G. O'Neill, L. Mdletshe, M. V. Chisapi, O. Shirinda, T. C. Khumalo, D. Kenfack, A. A. Netshiya, M. A. Sithole, J. J. Lawrie, L. Msebi, J.F. Sharpey-Schafer, K. L. Malatji, S. H. Mthembu, P. M. Someketa, S. Jongile, S. S. Ntshangase, A. A. Avaa, Robert Bark, and A. Kardan

Subjects
Physics, Rotor (electric), law, Quantum mechanics, Quasiparticle, Structure (category theory), Precession, Interpretation (model theory), law.invention
Published
2021
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8. Low- and medium-spin negative-parity bands in the Os187 nucleus

Author

L. Mdletshe, P. L. Masiteng, O. Shirinda, T. C. Khumalo, M. V. Chisapi, Ingemar Ragnarsson, Peter B. Jones, A. A. Netshiya, E. A. Lawrie, J. Ndayishimye, S. N. T. Majola, S. Jongile, S. S. Ntshangase, G. G. O'Neill, B. R. Zikhali, B. Maqabuka, J. J. Lawrie, J. F. Sharpey Schafer, K. L. Malatji, S. H. Mthembu, M. A. Sithole, T. D. Bucher, P. M. Someketa, D. Kenfack, A. Kardan, L. Makhathini, and L. Msebi

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Nuclear Theory, Detector, Polarization (waves), 01 natural sciences, Molecular physics, medicine.anatomical_structure, Angular distribution, 0103 physical sciences, medicine, 010306 general physics, Parity (mathematics), Nucleus, Beam energy, Spin-½
Abstract

Low- and medium-spin negative-parity bands of Os187 have been studied using the AFRican Omnipurpose Detector for Innovative Techniques and Experiments (AFRODITE) array, following the W186(He4,3n)Os187 reaction at a beam energy of 37 MeV. In the current work, all the previously known bands have been significantly extended and three new bands have been added to the level scheme. The angular distribution ratio (RAD) and polarization measurements have been used to assign spin and parity to the observed new levels. The configurations of some of the bands have been modified. The observed bands are interpreted within the cranked shell model (CSM) and cranked Nilsson-Strutinsky-Bogoliubov (CNSB) formalism. Comparison with experimental data shows good agreements. Systematic comparison with the neighboring Os185 isotope is also discussed. (Less)

Published
2021
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10. First candidates for γ vibrational bands built on the [505]11/2− neutron orbital in odd- A Dy isotopes

Author

J. Simpson, J. N. Orce, Catherine Scholey, Sanna Stolze, T. Lauritsen, A. Korichi, L. Makhathini, P. Ruotsalainen, O. Shirinda, I. Stefanescu, F. G. Kondev, J. F. Sharpey-Schafer, C. W. Beausang, D. G. Roux, N. Cooper, R. A. Bark, J. Hirvonen, Paul Greenlees, D. Miller, L. Mdletshe, B. J. P. Gall, V. Werner, E. A. McCutchan, S. N. T. Majola, E. A. Lawrie, X. Wang, Pauli Peura, J. L. Wood, S. Miller, J. Ndayishimye, C. J. Chiara, S. P. Bvumbi, Juha Sorri, Juha Uusitalo, D. Hartley, L. L. Riedinger, N. Redon, L. Bianco, Jan Sarén, S. H. Mthembu, M. A. Riley, L. Msebi, S. S. Ntshangase, Ulrika Jakobsson, B. Maqabuka, T. S. Dinoko, W. D. Kulp, J. M. Allmond, M. P. Carpenter, Peter B. Jones, G. Zimba, B. M. Nyakó, Rauno Julin, József Tímár, S. Zhu, B. V. Kheswa, Paivi Nieminen, T. D. Bucher, M. A. Sithole, P. Z. Ngcobo, Panu Rahkila, Sakari Juutinen, D. Curien, A. Minkova, D. M. Cullen, J. Piot, Steffen Ketelhut, C. H. Yu, P. L. Masiteng, and P. E. Garrett

Subjects
Physics, Coupling, Isotope, 010308 nuclear & particles physics, Nuclear structure, 01 natural sciences, 7. Clean energy, Excited state, 0103 physical sciences, Vibrational bands, Neutron, Gammasphere, Atomic physics, 010306 general physics, Spin (physics)
Abstract

Rotational structures have been measured using the Jurogam II and GAMMASPHERE arrays at low spin following the Gd155(α,2n)Dy157 and Nd148(C12,5n)Dy155 reactions at 25 and 65 MeV, respectively. We report high-K bands, which are conjectured to be the first candidates of a Kπ=2+γ vibrational band, built on the [505]11/2− neutron orbital, in both odd-ADy155,157 isotopes. The coupling of the first excited K=0+ states or the so-called β vibrational bands at 661 and 676 keV in Dy154 and Dy156 to the [505]11/2− orbital, to produce a Kπ=11/2− band, was not observed in both Dy155 and Dy157, respectively. The implication of these findings on the interpretation of the first excited 0+ states in the core nuclei Dy154 and Dy156 are also discussed.

Published
2020
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11. β and γ bands in N=88 , 90, and 92 isotones investigated with a five-dimensional collective Hamiltonian based on covariant density functional theory: Vibrations, shape coexistence, and superdeformation

Author

B. V. Kheswa, Peter B. Jones, A. Minkova, Z. P. Li, D. Negi, D. M. Cullen, R. Lindsay, O. Shirinda, B. M. Nyakó, R. A. Bark, R. Newman, T. S. Dinoko, D. G. Aschman, Jan Sarén, P. I. Mashita, L. L. Riedinger, R. Ntshodu, J. E. Easton, J. Hirvonen, S. Jongile, P. Papka, L. Msebi, Sanna Stolze, J. F. Sharpey-Schafer, N. A. Khumalo, Ulrika Jakobsson, M. Wiedeking, E. A. Lawrie, S. P. Bvumbi, Paul Greenlees, A. Korichi, Juha Sorri, P. Ruotsalainen, M. Stankiewicz, A. Netshiya, S. S. Ntshangase, Sakari Juutinen, Catherine Scholey, József Tímár, J. Ndayishimye, M. A. Riley, D. G. Roux, S. N. T. Majola, Pauli Peura, Steffen Ketelhut, K. L. Malatji, D. Hartley, T. E. Madiba, S. M. Mullins, P. A. Vymers, S. Q. Zhang, M. A. Sithole, Juha Uusitalo, P. L. Masiteng, T. D. Bucher, B. Y. Song, L. Makhathini, Panu Rahkila, N. Erasmus, G. Zimba, Z. Shi, S. M. Maliage, B. Maqabuka, L. Mdletshe, J. J. Lawrie, and Rauno Julin

Subjects
Physics, 010308 nuclear & particles physics, Nuclear structure, 01 natural sciences, Hamiltonian system, Superdeformation, Vibration, symbols.namesake, Quantum mechanics, 0103 physical sciences, symbols, Density functional theory, Covariant transformation, 010306 general physics, Hamiltonian (quantum mechanics)
Abstract

CITATION: Majola, S. N. T. et al. 2019. β and γ bands in N=88, 90, and 92 isotones investigated with a five-dimensional collective Hamiltonian based on covariant density functional theory: Vibrations, shape coexistence, and superdeformation. Physical Review C, 100(4). doi:10.1103/PhysRevC.100.044324.

Published
2019
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12. 'Stapler' mechanism for a dipole band in Se79

Author

Z. Q. Chen, J.F. Sharpey-Schafer, Xiaocan Li, H. Y. Wu, N. A. Khumalo, D. W. Luo, Shuangxi Wang, T. D. Bucher, Jie Meng, Peter B. Jones, R. Han, S. Y. Wang, Y. L. Ye, D. X. Jiang, C. Xu, Hui Hua, K. L. Malatji, S. M. Wyngaardt, Q. B. Chen, Chengbu Liu, Z. H. Li, E. A. Lawrie, Z. Q. Li, C. G. Wu, C. G. Li, C. Y. Niu, S. S. Ntshangase, L. Msebi, Z. Shi, C. G. Wang, D. P. Sun, Robert Bark, X. Wang, Shishu Zhang, Furong Xu, T. R. S. Dinoko, B. V. Kheswa, A. C. Dai, O. Shirinda, and B. H. Sun

Subjects
Physics, Dipole, Nuclear fusion, Magnetic dipole, Chemical reaction, Molecular physics, Mechanism (sociology)
Abstract

CITATION: Li, C. G. et al. 2019. “Stapler” mechanism for a dipole band in 79Se. Physical Review C, 100(4). doi:10.1103/PhysRevC.100.044318

Published
2019
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13. Electron spectrometer for electric monopole (E0) transition studies in nuclei

Author

B.R. Zikhali, Tibor Kibedi, A. A. Avaa, M. V. Chisapi, L. Msebi, Peter G Jones, and I. T. Usman

Subjects
Physics, Nuclear and High Energy Physics, Photon, Electron spectrometer, Spectrometer, 010308 nuclear & particles physics, Magnetic monopole, Electron, 01 natural sciences, Internal conversion, Charge radius, 0103 physical sciences, Quadrupole, Atomic physics, 010306 general physics, Instrumentation
Abstract

The study of electric monopole (E0) transitions between two 0 + states is important because the monopole strength carries vital information about the nuclear structure due to its direct link with the mean squared charge radius r 2 and quadrupole deformation parameter β . Therefore, the measurement of internal conversion electrons (ICE) or internal pair formation (IPF) is crucial for E0 transition studies. Transitions between 0 + states do not change angular momentum. Hence, single-photon emission is forbidden, but can decay by conversion electrons or pair formation and two-photon emission which is mostly negligible. In order to implement E0 studies at iThemba LABS, an electron spectrometer that uses a solenoidal magnetic field acting as a lens and a Si(Li) detector has been refurbished and characterized using calibration sources of ICE. Figures of merit have been extracted and compared with simulations. The spectrometer coupled with an array of LaBr3:Ce detectors and Low Energy Photon Spectrometers (LEPS) was successfully implemented for in-beam experiments. Measurements of internal conversion coefficients (ICC) and monopole strengths extracted from in-beam measurements of 72As, 72Ge, and 72Se are presented.

Published
2020
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15. Investigations of nuclear chirality at iThemba LABS.

Author

Bark, R. A., Lawrie, E. A., Liu, C., and Wang, S. Y.

Abstract

Progress in the studies of chirality in atomic nuclei at iThemba LABS is reviewed. New regions of chirality, around mass 80 and 190 have been discovered using the AFRODITE array, specifically in the nuclei 74As, 78,80,82Br, 81Kr, and 193,194,198Tl. Many phenomena have been observed, including multiple chiral bands in the same nucleus, the coexistence of octupole correlations and nuclear chirality, and the coexistence of pseudo spin and nuclear chirality. The best example of chiral degeneracy to date was found in 194Tl. The level scheme of 106Ag has been revisited and interpreted in terms of two- and four-quasiparticle bands. Investigations using the particle-rotor model have shown that the fingerprints of chirality in the two-quasiparticle system only can occur in an idealised model description. For systems with a higher number of quasiparticles, the calculations showed that nuclear chirality can persist. [ABSTRACT FROM AUTHOR]

Published
2024
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16. Yrare low-spin positive-parity states in N = 88 66154Dy.

Author

Zimba, G. L., Bvumbi, S. P., Masiteng, L. P., Jones, P., Sharpey-Schafer, J. F., Majola, S. N. T., Dinoko, T. S., Shirinda, O., Lawrie, J. J., Easton, J. E., Khumalo, N. A., Msebi, L., Mashita, P. I., Papka, P., Roux, D. G., and Negi, D.

Subjects
SPECTROMETERS, POLARIZATION (Electricity), QUANTUM mechanics, HADRONS, ELECTRICAL energy
Abstract

Low-spin positive-parity yrare states of 66154Dy88 were established using the 155Gd(3He,4n) reaction at a beam energy of Elab=37.5 MeV. The AFRODITE spectrometer array at iThemba LABS was used to record γγ coincidences and measure DCO ratios and polarisation asymmetries. The Kπ=2+γ band has been observed up to spin 13+ in the odd spins and to 12+ in the even spins. The staggering parameter S(I) of the γ band is compared to that found in other N = 88 isotones. Different behaviour of S(I) with increasing spin is observed for each of the isotones. We conjecture that the variation in S(I) is mainly due to mixing of the even-spin states with the same spin and parity states in neighbouring rotational bands. A second Kπ=2+ band has been established up to a spin of 12+ in the even spins. We suggest that this is a γ band based on the Jπ=0+ state at Ex=660.6 keV. [ABSTRACT FROM AUTHOR]

Published
2018
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