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27 results on '"Jongile, S."'

1. Fine structure of the isoscalar giant monopole resonance in $^{58}$Ni, $^{90}$Zr, $^{120}$Sn and $^{208}$Pb

Author

Bahini, A., von Neumann-Cosel, P., Carter, J., Usman, I. T., Arsenyev, N. N., Severyukhin, A. P., Litvinova, E., Fearick, R. W., Neveling, R., Adsley, P., Botha, N., Brümmer, J. W., Donaldson, L. M., Jongile, S., Khumalo, T. C., Latif, M. B., Li, K. C. W., Mabika, P. Z., Molema, P. T., Moodley, C. S., Olorunfunmi, S. D., Papka, P., Pellegri, L., Rebeiro, B., Sideras-Haddad, E., Smit, F. D., Triambak, S., van Zyl, J. J., and Wiedeking, M.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Over the past two decades high energy-resolution inelastic proton scattering studies were used to gain an understanding of the origin of fine structure observed in the isoscalar giant quadrupole resonance (ISGQR) and the isovector giant dipole resonance (IVGDR). Recently, the isoscalar giant monopole resonance (ISGMR) in $^{58}$Ni, $^{90}$Zr, $^{120}$Sn and $^{208}$Pb was studied at the iThemba Laboratory for Accelerator Based Sciences (iThemba LABS) by means of inelastic $\alpha$-particle scattering at very forward scattering angles (including $0\circ$). The good energy resolution of the measurement revealed significant fine structure of the ISGMR.~To extract scales by means of wavelet analysis characterizing the observed fine structure of the ISGMR in order to investigate the role of different mechanisms contributing to its decay width. Characteristic energy scales are extracted from the fine structure using continuous wavelet transforms. The experimental energy scales are compared to different theoretical approaches performed in the framework of quasiparticle random phase approximation (QRPA) and beyond-QRPA including complex configurations using both non-relativistic and relativistic density functional theory. All models highlight the role of Landau fragmentation for the damping of the ISGMR especially in the medium-mass region. Models which include the coupling between one particle-one hole (1p-1h) and two particle-two hole (2p-2h) configurations modify the strength distributions and wavelet scales indicating the importance of the spreading width. The effect becomes more pronounced with increasing mass number. Wavelet scales remain a sensitive measure of the interplay between Landau fragmentation and the spreading width in the description of the fine structure of giant resonances., Comment: 13 pages,7 figures, regular article

Published
2023

2. Isoscalar giant monopole strength in $^{58}$Ni, $^{90}$Zr, $^{120}$Sn and $^{208}$Pb

Author

Bahini, A., Neveling, R., von Neumann-Cosel, P., Carter, J., Usman, I. T., Adsley, P., Botha, N., Brümmer, J. W., Donaldson, L. M., Jongile, S., Khumalo, T. C., Latif, M. B., Li, K. C. W., Mabika, P. Z., Molema, P. T., Moodley, C. S., Olorunfunmi, S. D., Papka, P., Pellegri, L., Rebeiro, B., Sideras-Haddad, E., Smit, F. D., Triambak, S., Wiedeking, M., and van Zyl, J. J.

Subjects
Nuclear Experiment
Abstract

Inelastic $\alpha$-particle scattering at energies of a few hundred MeV and very-forward scattering angles including $0^\circ$ has been established as a tool for the study of the isoscalar giant monopole (IS0) strength distributions in nuclei. An independent investigation of the IS0 strength in nuclei across a wide mass range was performed using the $0^\circ$ facility at iThemba Laboratory for Accelerator Based Sciences (iThemba LABS), South Africa, to understand differences observed between IS0 strength distributions in previous experiments performed at the Texas A\&M University (TAMU) Cyclotron Institute, USA and the Research Center for Nuclear Physics (RCNP), Japan. The isoscalar giant monopole resonance (ISGMR) was excited in $^{58}$Ni, $^{90}$Zr, $^{120}$Sn and $^{208}$Pb using $\alpha$-particle inelastic scattering with $196$ MeV $\alpha$ beam and scattering angles $\theta_{\text{Lab}} = 0^\circ$ and $4^\circ$. The K$600$ magnetic spectrometer at iThemba LABS was used to detect and momentum analyze the inelastically scattered $\alpha$ particles. The IS0 strength distributions in the nuclei studied were deduced with the difference-of-spectra (DoS) technique including a correction factor for the $4^\circ$ data based on the decomposition of $L > 0$ cross sections in previous experiments. IS0 strength distributions for $^{58}$Ni, $^{90}$Zr, $^{120}$Sn and $^{208}$Pb are extracted in the excitation-energy region $E_{\rm x} = 9 - 25$ MeV.Using correction factors extracted from the RCNP experiments, there is a fair agreement with their published IS0 results. Good agreement for IS0 strength in $^{58}$Ni is also obtained with correction factors deduced from the TAMU results, while marked differences are found for $^{90}$Zr and $^{208}$Pb., Comment: 12 pages, 10 figures, regular article submitted to PRC

Published
2022
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3. PANDORA project: photo-nuclear reactions below $A=60$

Author

Tamii, A., Pellegri, L., Söderström, P. -A., Allard, D., Goriely, S., Inakura, T., Khan, E., Kido, E., Kimura, M., Litvinova, E., Nagataki, S., von Neumann-Cosel, P., Pietralla, N., Shimizu, N., Tsoneva, N., Utsuno, Y., Adachi, S., Adsley, P., Bahini, A., Balabanski, D., Baret, B., Bekker, J. A. C., Binda, S. D., Boicu, E., Bracco, A., Brandherm, I., Brezeanu, M., Brummer, J. W., Camera, F., Crespi, F. C. L., Dalal, R., Donaldson, L. M., Fujikawa, Y., Furuno, T., Haoning, H., Honda, Y., Gavrilescu, A., Inoue, A., Isaak, J., Jivan, H., Jones, P. M., Jongile, S., Just, O., Kawabata, T., Khumalo, T., Kiener, J., Kleemann, J., Kobayashi, N., Koshio, Y., Kuşoğlu, A., Li, K. C. W., Malatji, K. L., Molaeng, R. E., Motoki, H., Murata, M., Netshiya, A. A., Neveling, R., Niina, R., Okamoto, S., Ota, S., Papst, O., Parizot, E., Petruse, T., Reen, M. S., Ring, P., Sakanashi, K., Sideras-Haddad, E., Siem, S., Spall, M., Suda, T., Sudo, T., Taniguchi, Y., Tatischeff, V., Utsunomiya, H., Wang, H., Werner, V., Wibowo, H., Wiedeking, M., Wieland, O., Xu, Y., and Yang, Z. H.

Subjects
Nuclear Experiment, Astrophysics - High Energy Astrophysical Phenomena, Nuclear Theory
Abstract

Photo-nuclear reactions of light nuclei below a mass of $A=60$ are studied experimentally and theoretically by the PANDORA (Photo-Absorption of Nuclei and Decay Observation for Reactions in Astrophysics) project. Two experimental methods, virtual-photon excitation by proton scattering and real-photo absorption by a high-brilliance gamma-ray beam produced by laser Compton scattering, will be applied to measure the photo-absorption cross sections and the decay branching ratio of each decay channel as a function of the photon energy. Several nuclear models, e.g. anti-symmetrized molecular dynamics, mean-field type models, a large-scale shell model, and ab initio models, will be employed to predict the photo-nuclear reactions. The uncertainty in the model predictions will be evaluated from the discrepancies between the model predictions and the experimental data. The data and the predictions will be implemented in a general reaction calculation code TALYS . The results will be applied to the simulation of the photo-disintegration process of ultra-high-energy cosmic rays in inter-galactic propagation.

Published
2022

4. Isoscalar giant monopole resonance in $^{24}$Mg and $^{28}$Si: Effect of coupling between the isoscalar monopole and quadrupole strength

Author

Bahini, A., Nesterenko, V. O., Usman, I. T., von Neumann-Cosel, P., Neveling, R., Carter, J., Kvasil, J., Repko, A., Adsley, P., Botha, N., Brummer, J. W., Donaldson, L. M., Jongile, S., Khumalo, T. C., Latif, M. B., Li, K. C. W., Mabika, P. Z., Molema, P. T., Moodley, C. S., Olorunfunmi, S. D., Papka, P., Pellegri, L., Rebeiro, B., Sideras-Haddad, E., Smit, F. D., Triambak, S., and van Zyl, J. J.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Background: In highly deformed nuclei, there is a noticeable coupling of the Isoscalar Giant Monopole Resonance (ISGMR) and the $K = 0$ component of the Isoscalar Giant Quadrupole Resonance (ISGQR), which results in a double peak structure of the isoscalar monopole (IS0) strength (a narrow low-energy deformation-induced peak and a main broad ISGMR part). The energy of the narrow low-lying IS0 peak is sensitive to both the incompressibility modulus $K_\infty$ and the coupling between IS0 and isoscalar quadrupole (IS2) strength. Objective: This study aims to investigate the two-peaked structure of the ISGMR in the prolate $^{24}$Mg and oblate $^{28}$Si nuclei and identify among a variety of energy density functionals based on Skyrme parameterisations the one which best describes the experimental data. This will allow for conclusions regarding the nuclear incompressibility. Because of the strong IS0/IS2 coupling, the deformation splitting of the ISGQR will also be analysed. Methods: The ISGMR was excited in $^{24}$Mg and $^{28}$Si using $\alpha$-particle inelastic scattering measurements acquired with an $E_\alpha = 196$ MeV beam at scattering angles $\theta_{\text{Lab}} = 0^\circ$ and $4^\circ$. The K$600$ magnetic spectrometer at iThemba LABS was used to detect and momentum analyse the inelastically scattered $\alpha$ particles. An experimental energy resolution of $\approx 70$ keV (FWHM) was attained, revealing fine structure in the excitation-energy region of the ISGMR. The IS0 strength distributions in the nuclei studied were obtained with the Difference-of-Spectrum (DoS) technique. The theoretical comparison is based on the quasiparticle random-phase approximation (QRPA) with a representative set of Skyrme forces., Comment: 17 pages, 16 figures, regular article

Published
2021
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5. The Structure of $^{33}$Si and the magicity of the N=20 gap at Z=14

Author

Jongile, S., Lemasson, A., Sorlin, O., Wiedeking, M., Papka, P., Bazin, D., Borcea, C., Borcea, R., Gade, A., Iwasaki, H., Khan, E., Lepailleur, A., Mutschler, A., Nowacki, F., Recchia, F., Roger, T., Rotaru, F., Stanoiu, M., Stroberg, S. R., Tostevin, J. A., Vandebrouck, M., Weisshaar, D., and Wimmer, K.

Subjects
Nuclear Experiment
Abstract

The structure of $^{33}$Si was studied by a one-neutron knockout reaction from a $^{34}$Si beam at 98.5 MeV/u incident on a $^{9}$Be target. The prompt $\gamma$-rays following the de-excitation of $^{33}$Si were detected using the GRETINA $\gamma$-ray tracking array while the reaction residues were identified on an event-by-event basis in the focal plane of the S800 spectrometer at NSCL (National Superconducting Cyclotron Laboratory). The presently derived spectroscopic factor values, $C^2S$, for the 3/2$^+$ and 1/2$^+$ states, corresponding to a neutron removal from the $0d_{3/2}$ and $1s_{1/2}$ orbitals, agree with shell model calculations and point to a strong $N=20$ shell closure. Three states arising from the more bound $0d_{5/2}$ orbital are proposed, one of which is unbound by about 930 keV. The sensitivity of this experiment has also confirmed a weak population of 9/2$^-$ and 11/2$_{1,2}^-$ final states, which originate from a higher-order process. This mechanism may also have populated, to some fraction, the 3/2$^-$ and 7/2$^-$ negative-parity states, which hinders a determination of the $C^2S$ values for knockout from the normally unoccupied $1p_{3/2}$ and $0f_{7/2}$ orbits.

Published
2020
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6. PANDORA Project for the study of photonuclear reactions below A=60

Author

Tamii, A., Pellegri, L., Söderström, P.-A., Allard, D., Goriely, S., Inakura, T., Khan, E., Kido, E., Kimura, M., Litvinova, E., Nagataki, S., Neumann-Cosel, P. von, Pietralla, N., Shimizu, N., Tsoneva, N., Utsuno, Y., Adachi, S., Adsley, P., Bahini, A., Balabanski, D., Baret, B., Bekker, J. A. C., Binda, S. D., Boicu, E., Bracco, A., Brandherm, I., Brezeanu, M., Brummer, J. W., Camera, F., Crespi, F. C. L., Dalal, R., Donaldson, L. M., Fujikawa, Y., Furuno, T., Haoning, H., Higuchi, R., Honda, Y., Gavrilescu, A., Inoue, A., Isaak, J., Jivan, H., Jones, P., Jongile, S., Just, O., Kawabata, T., Khumalo, T., Kiener, J., Kleemann, J., Kobayashi, N., Koshio, Y., Kuşoğlu, A., Li, K. C. W., Malatji, K. L., Molaeng, R. E., Motoki, H., Murata, M., Netshiya, A. A., Neveling, R., Niina, R., Okamoto, S., Ota, S., Papst, O., Parizot, E., Petruse, T., Reen, M. S., Ring, P., Sakanashi, K., Sideras-Haddad, E., Siem, S., Spall, M., Suda, T., Sudo, T., Taniguchi, Y., Tatischeff, V., Utsunomiya, H., Wang, H., Werner, V., Wibowo, H., Wiedeking, M., Wieland, O., Xu, Y., and Yang, Z. H.

Published
2023
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7. Second T = 3/2 state in $^9$B and the isobaric multiplet mass equation

Author

Mukwevho, N. J., Rebeiro, B. M., Marín-Lámbarri, D. J., Triambak, S., Adsley, P., Kheswa, N. Y., Neveling, R., Pellegri, L., Pesudo, V., Smit, F. D., Akakpo, E. H., Brümmer, J. W., Jongile, S., Kamil, M., Mabika, P. Z., Nemulodi, F., Orce, J. N., Papka, P., Steyn, G. F., and Yahia-Cherif, W.

Subjects
Nuclear Experiment
Abstract

Recent high-precision mass measurements and shell model calculations~[Phys. Rev. Lett. {\bf 108}, 212501 (2012)] have challenged a longstanding explanation for the requirement of a cubic isobaric multiplet mass equation for the lowest $A = 9$ isospin quartet. The conclusions relied upon the choice of the excitation energy for the second $T = 3/2$ state in $^9$B, which had two conflicting measurements prior to this work. We remeasured the energy of the state using the $^9{\rm Be}(^3{\rm He},t)$ reaction and significantly disagree with the most recent measurement. Our result supports the contention that continuum coupling in the most proton-rich member of the quartet is not the predominant reason for the large cubic term required for $A = 9$ nuclei.

Published
2018
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8. Evidence for Chiral Wobbler in Nuclei

Author

Guo, R. J., primary, Wang, S. Y., additional, Liu, C., additional, Bark, R. A., additional, Meng, J., additional, Zhang, S. Q., additional, Qi, B., additional, Rohilla, A., additional, Li, Z. H., additional, Hua, H., additional, Chen, Q. B., additional, Jia, H., additional, Lu, X., additional, Wang, S., additional, Sun, D. P., additional, Han, X. C., additional, Xu, W. Z., additional, Wang, E. H., additional, Bai, H. F., additional, Li, M., additional, Jones, P., additional, Sharpey-Schafer, J. F., additional, Wiedeking, M., additional, Shirinda, O., additional, Brits, C. P., additional, Malatji, K. L., additional, Dinoko, T., additional, Ndayishimye, J., additional, Mthembu, S., additional, Jongile, S., additional, Sowazi, K., additional, Kutlwano, S., additional, Bucher, T. D., additional, Roux, D. G., additional, Netshiya, A. A., additional, Mdletshe, L., additional, Noncolela, S., additional, and Mtshali, W., additional

Published
2024
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9. Pygmy Dipole Response in Samarium isotopes

Author

Jivan, H, primary, Pellegri, L, additional, Adsley, P., additional, Bahini, A., additional, Brummer, J.W., additional, Donaldson, L.M., additional, Färber, M., additional, Görgen, A., additional, Jones, P., additional, Jongile, S., additional, Khumalo, T., additional, Li, K.C.W., additional, Marin-Lambarri, D.J., additional, Lanza, E.G., additional, Negret, A., additional, von Neumann-Cosel, P., additional, Neveling, R, additional, Olacel, A., additional, Papka, P., additional, Pesudo, V, additional, Savran, D., additional, Sideras-Haddad, E., additional, Siem, S., additional, Smit, F.D., additional, Steyn, G.F., additional, Usman, I., additional, Van Zyl, J.J, additional, Wiedeking, M., additional, and Weinert, M., additional

Published
2023
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10. Isoscalar giant monopole strength in Ni58, Zr90, Sn120 , and Pb208

Author

Bahini, A., primary, Neveling, R., additional, von Neumann-Cosel, P., additional, Carter, J., additional, Usman, I. T., additional, Adsley, P., additional, Botha, N., additional, Brümmer, J. W., additional, Donaldson, L. M., additional, Jongile, S., additional, Khumalo, T. C., additional, Latif, M. B., additional, Li, K. C. W., additional, Mabika, P. Z., additional, Molema, P. T., additional, Moodley, C. S., additional, Olorunfunmi, S. D., additional, Papka, P., additional, Pellegri, L., additional, Rebeiro, B., additional, Sideras-Haddad, E., additional, Smit, F. D., additional, Triambak, S., additional, Wiedeking, M., additional, and van Zyl, J. J., additional

Published
2023
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11. New collective structures in the 163Yb nucleus

Author

Sithole, M. A., Sharpey Schafer, J. F., Majola, S. N. T., Bucher, T. D., Dinoko, T. R. S., Ntshangase, S. S., Lawrie, E. A., Khumalo, N. A., Jongile, S., Mdletshe, L., Bark, R. A., Erasmus, N., Jones, P., Kheswa, B. V., Lawrie, J. J., Makhathini, L., Malatji, K. L., Maqabuka, B., Noncolela, S. P., Ndayishimye, J., Shirinda, O., Zikhali, B. R., and Masiteng, P. L.

Published
2019
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12. Collective rotational bands at low excitation energy in Os186 : Vibrational and rotational degrees of freedom

Author

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

Published
2022
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13. Low-lying positive parity bands in 162Yb

Author

Mdletshe, L., Ntshangase, S. S., Sharpey-Schafer, J. F., Majola, S. N. T., Dinoko, T. R. S., Khumalo, N. A., Lawrie, E. A., Bark, R. A., Bucher, T. D., Erasmus, N., Jones, P., Jongile, S., Kheswa, B. V., Lawrie, J. J., Makhathini, L., Malatji, K. L., Maqabuka, B., Ndayishimye, J., Noncolela, S. P., Shirinda, O., and Sithole, M. A.

Published
2018
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14. Isoscalar giant monopole resonance in Mg24 and Si28 : Effect of coupling between the isoscalar monopole and quadrupole strength

Author

Bahini, A., primary, Nesterenko, V. O., additional, Usman, I. T., additional, von Neumann-Cosel, P., additional, Neveling, R., additional, Carter, J., additional, Kvasil, J., additional, Repko, A., additional, Adsley, P., additional, Botha, N., additional, Brümmer, J. W., additional, Donaldson, L. M., additional, Jongile, S., additional, Khumalo, T. C., additional, Latif, M. B., additional, Li, K. C. W., additional, Mabika, P. Z., additional, Molema, P. T., additional, Moodley, C. S., additional, Olorunfunmi, S. D., additional, Papka, P., additional, Pellegri, L., additional, Rebeiro, B., additional, Sideras-Haddad, E., additional, Smit, F. D., additional, Triambak, S., additional, and van Zyl, J. J., additional

Published
2022
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15. Collective structures in Cu62

Author

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

Published
2022
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16. Structure of collective states built on the 11/2+ isomer in Os187 : Quasiparticle-plus-triaxial-rotor model and interpretation as tilted-precession bands

Author

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

Published
2021
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17. Low- and medium-spin negative-parity bands in the Os187 nucleus

Author

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

Published
2021
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18. The Structure of ³³Si and the magicity of the N=20 gap at Z=14

Author

Jongile, S., Lemasson, A., Sorlin, O., Wiedeking, M., Papka, P., Bazin, D., Borcea, C., Borcea, R., Gade, A., Iwasaki, H., Khan, E., Lepailleur, A., Mutschler, A., Nowacki, F., Recchia, F., Roger, T., Rotaru, F., Stanoiu, M., Stroberg, S.R, Tostevin, J.A, Vanderbrouck, M., Weisshaar, D., and Wimmer, K.

Abstract

The structure of ³³Si was studied by a one-neutron knockout reaction from a ³⁴Si beam at 98.5 MeV/u incident on a 9 Be target. The prompt γ rays following the de-excitation of ³³Si were detected using the GRETINA γ -ray tracking array while the reaction residues were identified on an event-by-event basis in the focal plane of the S800 spectrometer at the National Superconducting Cyclotron Laboratory. The presently derived spectroscopic factor values, C 2 S , for the 3 / 2 + and 1 / 2 + states, corresponding to a neutron removal from the 0 d 3 / 2 and 1 s 1 / 2 orbitals, agree with shell model calculations and point to a strong N = 20 shell closure. Three states arising from the more bound 0 d 5 / 2 orbital are proposed, one of which is unbound by about 930 keV. The sensitivity of this experiment has also confirmed a weak population of 9 / 2 − and 11 / 2 − 1 , 2 final states, which originate from a higher-order process. This mechanism may also have populated, to some fraction, the 3 / 2 − and 7 / 2 − negative-parity states, which hinders a determination of the C 2 S values for knockout from the normally unoccupied 1 p 3 / 2 and 0 f 7 / 2 orbits.

Published
2020

19. Structure of Si 33 and the magicity of the N=20 gap at Z=14

Author

Jongile, S., Lemasson, A., Sorlin, O., Wiedeking, M., Papka, P., Bazin, D., Borcea, C., Borcea, R., Gade, A., Iwasaki, H., Khan, E., Lepailleur, A., Mutschler, A., Nowacki, F., Recchia, F., Roger, T., Rotaru, F., Stanoiu, M., Stroberg, S. R., Tostevin, J. A., Vandebrouck, M., Weisshaar, D., and Wimmer, K.

Published
2020

20. Structure of Si33 and the magicity of the N=20 gap at Z=14

Author

Jongile, S., primary, Lemasson, A., additional, Sorlin, O., additional, Wiedeking, M., additional, Papka, P., additional, Bazin, D., additional, Borcea, C., additional, Borcea, R., additional, Gade, A., additional, Iwasaki, H., additional, Khan, E., additional, Lepailleur, A., additional, Mutschler, A., additional, Nowacki, F., additional, Recchia, F., additional, Roger, T., additional, Rotaru, F., additional, Stanoiu, M., additional, Stroberg, S. R., additional, Tostevin, J. A., additional, Vandebrouck, M., additional, Weisshaar, D., additional, and Wimmer, K., additional

Published
2020
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21. 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

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

Subjects
electromagnetic transitions, nuclear density functional theory, nuclear spin and parity, nucleon induced nuclear reactions, collective levels, collective models, low and intermediate energy heavy-ion reactions, ydinfysiikka
Abstract

A comprehensive systematic study is made for the collective β and γ bands in even-even isotopes with neutron numbers N=88 to 92 and proton numbers Z=62(Sm) to 70 (Yb). Data, including excitation energies, B(E0) and B(E2) values, and branching ratios from previously published experiments are collated with new data presented for the first time in this study. The experimental data are compared to calculations using a five-dimensional collective Hamiltonian (5DCH) based on the covariant density functional theory (CDFT). A realistic potential in the quadrupole shape parameters V(β,γ) is determined from potential energy surfaces (PES) calculated using the CDFT. The parameters of the 5DCH are fixed and contained within the CDFT. Overall, a satisfactory agreement is found between the data and the calculations. In line with the energy staggering S(I) of the levels in the 2γ+ bands, the potential energy surfaces of the CDFT calculations indicate γ-soft shapes in the N=88 nuclides, which become γ rigid for N=90 and N=92. The nature of the 02+ bands changes with atomic number. In the isotopes of Sm to Dy, they can be understood as β vibrations, but in the Er and Yb isotopes the 02+ bands have wave functions with large components in a triaxial superdeformed minimum. In the vicinity of 152Sm, the present calculations predict a soft potential in the β direction but do not find two coexisting minima. This is reminiscent of 152Sm exhibiting an X(5) behavior. The model also predicts that the 03+ bands are of two-phonon nature, having an energy twice that of the 02+ band. This is in contradiction with the data and implies that other excitation modes must be invoked to explain their origin. peerReviewed

Published
2019

22. $\beta$ and $\gamma$ 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

Majola, S.N.T., Shi, Z., Song, B.Y., Li, Z.P., Zhang, S.Q., Bark, R.A., Sharpey-Schafer, J.F., Aschman, D.G., Bvumbi, S.P., Bucher, T.D., Cullen, D.M., Dinoko, T.S., Easton, J.E., Erasmus, N., Greenlees, P.T., Hartley, D.J., Hirvonen, J., Korichi, A., Jakobsson, U., Jones, P., Jongile, S., Julin, R., Juutinen, S., Ketelhut, S., Kheswa, B.V., Khumalo, N.A., Lawrie, E.A., Lawrie, J.J., Lindsay, R., Madiba, T.E., Makhathini, L., Maliage, S.M., Maqabuka, B., Malatji, K.L., Masiteng, P.L., Mashita, P.I., Mdletshe, L., Minkova, A., Msebi, L., Mullins, S.M., Ndayishimye, J., Negi, D., Netshiya, A., Newman, R., Ntshangase, S.S., Ntshodu, R., Nyakó, B.M., Papka, P., Peura, P., Rahkila, P., Riedinger, L.L., Riley, M.A., Roux, D.G., Ruotsalainen, P., Saren, J.J., Scholey, C., Shirinda, O., Sithole, M.A., Sorri, J., Stankiewicz, M., Stolze, S., Timár, J., Uusitalo, J., Vymers, P.A., Wiedeking, M., Zimba, G.L., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure
Abstract

International audience; A comprehensive systematic study is made for the collective β and γ bands in even-even isotopes with neutron numbers N=88 to 92 and proton numbers Z=62(Sm) to 70 (Yb). Data, including excitation energies, B(E0) and B(E2) values, and branching ratios from previously published experiments are collated with new data presented for the first time in this study. The experimental data are compared to calculations using a five-dimensional collective Hamiltonian (5DCH) based on the covariant density functional theory (CDFT). A realistic potential in the quadrupole shape parameters V(β,γ) is determined from potential energy surfaces (PES) calculated using the CDFT. The parameters of the 5DCH are fixed and contained within the CDFT. Overall, a satisfactory agreement is found between the data and the calculations. In line with the energy staggering S(I) of the levels in the 2γ+ bands, the potential energy surfaces of the CDFT calculations indicate γ-soft shapes in the N=88 nuclides, which become γ rigid for N=90 and N=92. The nature of the 02+ bands changes with atomic number. In the isotopes of Sm to Dy, they can be understood as β vibrations, but in the Er and Yb isotopes the 02+ bands have wave functions with large components in a triaxial superdeformed minimum. In the vicinity of Sm152, the present calculations predict a soft potential in the β direction but do not find two coexisting minima. This is reminiscent of Sm152 exhibiting an X(5) behavior. The model also predicts that the 03+ bands are of two-phonon nature, having an energy twice that of the 02+ band. This is in contradiction with the data and implies that other excitation modes must be invoked to explain their origin.

Published
2019

23. 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

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

Published
2019
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24. Second T=3/2 state in B9 and the isobaric multiplet mass equation

Author

Mukwevho, N. J., primary, Rebeiro, B. M., additional, Marín-Lámbarri, D. J., additional, Triambak, S., additional, Adsley, P., additional, Kheswa, N. Y., additional, Neveling, R., additional, Pellegri, L., additional, Pesudo, V., additional, Smit, F. D., additional, Akakpo, E. H., additional, Brümmer, J. W., additional, Jongile, S., additional, Kamil, M., additional, Mabika, P. Z., additional, Nemulodi, F., additional, Orce, J. N., additional, Papka, P., additional, Steyn, G. F., additional, and Yahia-Cherif, W., additional

Published
2018
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25. New collective structures in the 163Yb nucleus.

Author

Sithole, M. A., Sharpey Schafer, J. F., Majola, S. N. T., Bucher, T. D., Dinoko, T. R. S., Ntshangase, S. S., Lawrie, E. A., Khumalo, N. A., Jongile, S., Mdletshe, L., Bark, R. A., Erasmus, N., Jones, P., Kheswa, B. V., Lawrie, J. J., Makhathini, L., Malatji, K. L., Maqabuka, B., Noncolela, S. P., and Ndayishimye, J.

Subjects
EXCITED states, NEUTRONS, SPECTROMETERS
Abstract

The 152Sm(16O, 5n)163Yb reaction at a beam energy of 93 MeV was used to study the excited states of 163Yb with the AFRODITE γ -ray spectrometer at iThemba LABS. The level scheme of 163Yb has been extended and new rotational bands established. The band based on the ground-state has been extended from a spin of 11/2- to spin 43/2-. A high-K band based on the neutron [505]11/2- Nilsson orbital has been observed and is reported for the first time in this work. Additional new states in 163Yb were observed which all decay to the yrast band. Some of these states are placed in a sequence which is conjectured to be a γ band involving a coupling with the i13/2[642]5/2+ neutron orbital. The band structures are discussed with reference to Cranked Shell Model (CSM) calculations and a systematic comparison with the neighbouring nuclei. [ABSTRACT FROM AUTHOR]

Published
2019
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26. Low-lying positive parity bands in 162Yb.

Author

Mdletshe, L., Ntshangase, S. S., Sharpey-Schafer, J. F., Majola, S. N. T., Dinoko, T. R. S., Khumalo, N. A., Lawrie, E. A., Bark, R. A., Bucher, T. D., Erasmus, N., Jones, P., Jongile, S., Kheswa, B. V., Lawrie, J. J., Makhathini, L., Malatji, K. L., Maqabuka, B., Ndayishimye, J., Noncolela, S. P., and Shirinda, O.

Subjects
YTTERBIUM, HEAVY ion fusion reactions, NUCLEAR vibrational states, ELECTRONIC band structure, NUCLEAR spin
Abstract

The structure of the low-lying positive parity bands in 162Yb has been studied at iThemba LABS, using the 150Sm(16O,4n)162Yb fusion-evaporation reaction. A band built on the first excited 02+ state has been identified for the first time. In addition, we report new rotational levels that form the band structures of both the odd and even spin components of the γ-vibrational band. The first excited 02+ band and the even spin members of the γ-vibrational band exhibit a Landau-Zenner crossing. This crossing demonstrates that the significant signature splitting between the odd and even spin members of the γ band is contributed to by band mixing. [ABSTRACT FROM AUTHOR]

Published
2018
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27. Second T=3/2 state in 9B and the isobaric multiplet mass equation.

Author

Mukwevho, N. J., Rebeiro, B. M., Marín-Lámbarri, D. J., Triambak, S., Adsley, P., Kheswa, N. Y., Neveling, R., Pellegri, L., Pesudo, V., Smit, F. D., Akakpo, E. H., Brümmer, J. W., Jongile, S., Kamil, M., Mabika, P. Z., Nemulodi, F., Orce, J. N., Papka, P., Steyn, G. F., and Yahia-Cherif, W.

Subjects
*ISOBARIC spin, *NUCLEAR shell theory, *MASS measurement
Abstract

Recent high-precision mass measurements and shell-model calculations [M. Brodeur et al., Phys. Rev. Lett. 108, 212501 (2012)] have challenged a longstanding explanation for the requirement of a cubic isobaric multiplet mass equation for the lowest A=9 isospin quartet. The conclusions relied upon the choice of the excitation energy for the second T=3/2 state in 9B, which had two conflicting measurements prior to this work. We remeasured the energy of the state using the 9Be(³He,t) reaction and significantly disagree with the most recent measurement. Our result supports the contention that continuum coupling in the most proton-rich member of the quartet is not the predominant reason for the large cubic term required for A=9 nuclei. [ABSTRACT FROM AUTHOR]

Published
2018
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