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111 results on '"Majola, S. N. T."'

1. Nuclear Level Density and $\gamma$-ray Strength Function of $^{67}\mathrm{Ni}$ and the impact on the i-process

Author

Ingeberg, V. W., Siem, S., Wiedeking, M., Choplin, A., Goriely, S., Siess, L., Abrahams, K. J., Arnswald, K., Garrote, F. Bello, Bleuel, D. L., Cederkäll, J., Christoffersen, T. L., Cox, D. M., De Witte, H., Gaffney, L. P., Görgen, A., Henrich, C., Illana, A., Jones, P., Kheswa, B. V., Kröll, T., Majola, S. N. T., Malatji, K. L., Ojala, J., Pakarinen, J., Rainovski, G., Reiter, P., von Schmid, M., Seidlitz, M., Tveten, G. M., Warr, N., and Zeiser, F.

Subjects
Nuclear Experiment, Astrophysics - Solar and Stellar Astrophysics, Nuclear Theory
Abstract

Proton-$\gamma$ coincidences from $(\mathrm{d},\mathrm{p})$ reactions between a $^{66}\mathrm{Ni}$ beam and a deuterated polyethylene target have been analyzed with the inverse-Oslo method to find the nuclear level density (NLD) and $\gamma$-ray strength function ($\gamma$SF) of $^{67}\mathrm{Ni}$. The $^{66}\mathrm{Ni}(\mathrm{n},\gamma)$ capture cross section has been calculated using the Hauser-Feshbach model in TALYS using the measured NLD and $\gamma$SF as constraints. The results confirm that the $^{66}\mathrm{Ni}(\mathrm{n},\gamma)$ reaction acts as a bottleneck when relying on one-zone nucleosynthesis calculations. However, the impact of this reaction is strongly damped in multi-zone low-metallicity AGB stellar models experiencing i-process nucleosynthesis., Comment: Submitted to Phys. Rev. C

Published
2023

2. First observation of rotational bands in the nucleus 231U

Author

Roux, D. G., Bark, R. A., Lawrie, E. A., Lawrie, J. J., Ntshangase, S. S., Dinoko, T. S., Easton, J. L., Jones, P., Kheswa, B. V., Khumalo, N. A., Majola, S. N. T., Masiteng, L. P., Negi, D., Noncolela, S. P., Ndayishimye, J., Sharpey-Schafer, J. F., Shirinda, O., and Uwitonze, P. C.

Published
2024
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3. Gamma-ray emission in proton-induced nuclear reactions on natC and Mylar targets over the incident energy range of Ep = 30-200 MeV. Astrophysical implications

Author

Rahma, Y., Ouichaoui, S., Kiener, J., Lawrie, E. A., Lawrie, J. J., Tatischeff, V., Belhout, A., Moussa, D., Yahia-Cherif, W., Benhabiles-Mezhoud, H., Bucher, T. D., Dinoko, T. R. S., Chafa, A., Conradie, J. L., Damache, S., Debabi, M., Deloncle, I., Easton, J. L., Fouka, M., Hamadache, C., Hammache, F., Jones, P., Kheswa, B. V., Khumalo, N. A., Lamula, T., Majola, S. N. T., Ndayishimye, J., Negi, D., Noncolela, S. P., Ouziane, S., Papka, P., Peterson, S, Raju, M. Kumar, Ramanathan, V., Rebeiro, B. M., de Séréville, N., Sharpey-Schafer, J. F., Shirinda, O., Wiedeking, M., and Wyngaardt, S.

Subjects
Nuclear Experiment
Abstract

We have measured the gamma-ray line production cross sections in proton-induced nuclear reactions on various target nuclei abundant in astrophysical sites over the incident energy range of Ep = 30 - 200 MeV. We carried out experimental campaigns in joint collaboration at the K = 200 cyclotron of iThemba LABS using a high-energy resolution, high-efficiency detection array composed of 8 Compton-suppressed clover detectors comprising 32 HP-Ge crystals for recording the gamma-ray spectra. In the current paper, we focus on de-excitation lines produced in proton irradiations of natC and Mylar targets. In particular, on the prominent 4.439 and 6.129 MeV lines of $^{12}$C and $^{16}$O which are among the strongest lines emitted in solar flares and in interactions of low-energy cosmic rays with the gas and dust of the inner galaxy. We report new gamma-ray production experimental cross section data for ten nuclear lines that we compare to previous low-energy data sets from the literature, to the predictions of the TALYS code of modern nuclear reactions and to a semi-empirical compilation. In first approach, performing calculations with default input parameters of TALYS we observed substantial deviations between the predicted cross sections and experimental data. Then, using modified optical model potential and nuclear level deformation parameters as input data we generated theoretical excitation functions for the above two main lines fully consistent with experimental data. In contrast, the experimental data sets for the other eight analyzed lines from the two proton-irradiated targets exhibit significant deviations with the predicted cross section values. We also report line-shape experimental data for the line complex observed at $E_g$ = 4.44 MeV in irradiations of the two targets. Finally, we emphasize the astrophysical implications of our results., Comment: 44 pages, 7 tables, 13 figures

Published
2022
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4. Observation of $\gamma$-vibrations and alignments built on non-ground-state configurations in 156Dy

Author

Majola, S. N. T., Hartley, D. J., Riedinger, L. L., Sharpey-Schafer, J. F., Allmond, J. M., Beausang, C., Carpenter, M. P., Chiara, C. J., Cooper, N., Curien, D., Gall, B. J. P., Garrett, P. E., Janssens, R. V. F., Kondev, F. G., Kulp, W. D., Lauritsen, T., McCutchan, E. A., Miller, D., Piot, J., Redon, N., Riley, M. A., Simpson, J., Stefanescu, I., Werner, V., Wang, X., Wood, J. L., Yu, C. -H., and Zhu, S.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The exact nature of the lowest $K^\pi =2_\gamma ^+$ rotational bands in all deformed nuclei remains obscure. Traditionally they are assumed to be collective vibrations of the nuclear shape in the $\gamma$ degree of freedom perpendicular to the nuclear symmetry axis. Very few such $\gamma$-bands have been traced past the usual back-bending rotational alignments of high-j nucleons. We have investigated the structure of positive-parity bands in the N=90 nucleus 156Dy, using the 148Nd(12C,4n)156Dy reaction at 65 MeV, observing the resulting ${\gamma}$-ray transitions with the Gammasphere array. The even- and odd-spin members of the $K^\pi =2_\gamma^+$ $\gamma$-band are observed to 32+ and 31+ respectively. This rotational band faithfully tracks the ground-state configuration to the highest spins. The members of a possible $\gamma$-vibration built on the aligned yrast S-band are observed to spins 28+ and 27+. An even-spin positive-parity band, observed to spin 24+, is a candidate for an aligned S-band built on the seniority-zero configuration of the $0_2^+$ state at 676 keV. The crossing of this band with the $0_2^+$ band is at $\hbar\omega$= 0.28(1) MeV and is consistent with the configuration of the $0_2^+$ band not producing any blocking of the monopole pairing., Comment: Published in Physics Review C

Published
2020
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5. First candidates for {\gamma} vibrational bands built on the [505]11/2- neutron orbital in odd-A Dy isotopes

Author

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

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Rotational structures have been measured using the Jurogam II and GAMMASPHERE arrays at low spin following the 155Gd({\alpha},2n)157Dy and 148Nd(12C, 5n)155Dy reactions at 25 and 65 MeV, respectively. We report high-K bands, which are conjectured to be the first candidates of a K{\pi}= 2+ {\gamma} vibrational band, built on the [505]11/2- neutron orbital, in both odd-A 155, 157Dy isotopes. The coupling of the first excited K=0+ states or the so-called \b{eta} vibrational bands at 661 and 676 keV in 154Dy and 156Dy to the [505]11/2- orbital, to produce a K{\pi}=11/2- band, was not observed in both 155Dy and 157Dy, respectively. The implication of these findings on the interpretation of the first excited 0+ states in the core nuclei 154Dy and 156Dy are also discussed., Comment: Published in Physical Rev C

Published
2020
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6. Spectroscopy of low spin states in 157Dy: Search for evidence of enhanced octupole correlations

Author

Majola, S. N. T., Bark, R. A., Bianco, L., Bucher, T. D., Bvumbi, S. P., Cullen, D. M., Garrett, P. E., Greenlees, P. T., Hartley, D., Hirvonen, J, Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kheswa, B. V., Korichi, A., Lawrie, E. A., Masiteng, P. L., Maqabuka, B., Mdletshe, L., Minkova, A., Ndayishimye, J., Nieminen, P., Newman, R., Nyako, B. M., Ntshangase, S. S., Peura, P., Rahkila, P., Riedinger, L. L., Riley, M., Roux, D., Ruotsalainen, P., Saren, J., Sharpey-Schafer, J. F., Scholey, C., Shirinda, O., Sithole, A., Sorri, J., Stolze, S., Timar, J., Uusitalo, J., and Zimba, G.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Low-spin states of 157Dy have been studied using the JUROGAM II array, following the 155Gd ({\alpha}, 2n) reaction at a beam energy of 25 MeV. The level scheme of 157Dy has been expanded with four new bands. Rotational structures built on the [523]5/2- and [402]3/2+ neutron orbitals constitute new additions to the level scheme as do many of the inter- and intra-band transitions. This manuscript also reports the observation of cross I- to (I-1)- and I- to (I-1)+ E1 dipole transitions inter-linking structures built on the [523]5/2- (band 5) and [402]3/2+ (band 7) neutron orbitals. These interlacing band structures are interpreted as the bands of parity doublets with simplex quantum number s = -i related to possible octupole correlations., Comment: Published in Physical Review C (2019)

Published
2020
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7. Measurement and analysis of nuclear $\gamma$-ray production cross sections in proton interactions with Mg, Si and Fe nuclei abundant in astrophysical sites over the incident energy range $E=30-66$ MeV

Author

Yahia-Cherif, W., Ouichaoui, S., Kiener, J., Lawrie, E. A., Lawrie, J. J., Tatischeff, V., Belhout, A., Moussa, D., Papka, P., Benhabiles, H., Bucher, T. D., Chafa, A., Conradie, J. L., Damache, S., Debabi, M., Deloncle, I., Easton, J. L., Hamadache, C., Hammache, F., Jones, P., Kheswa, B. V., Khumalo, N. A., Lamula, T., Majola, S. N. T., Ndayishimye, J., Negi, D., Noncolela, S. P., de Séréville, N., Sharpey-Schafer, J. F., Shirinda, O., Wiedeking, M., and Wyngaardt, S.

Subjects
Nuclear Experiment, Astrophysics - Solar and Stellar Astrophysics
Abstract

Gamma-ray production cross section excitation functions have been measured for $30$, $42$, $54$ and $66$ MeV proton beams accelerated onto targets of astrophysical interest, $^{nat}$C, C + O (Mylar), $^{nat}$Mg, $^{nat}$Si and $^{56}$Fe, at the Sector Separated Cyclotron (SSC) of iThemba LABS (near Cape Town, South Africa). The AFRODITE array equipped with 8 Compton suppressed HPGe clover detectors was used to record $\gamma$-ray data. For known, intense $\gamma$-ray lines the previously reported experimental data measured up to $E_{p}\simeq$ $25$ MeV at the Washington and Orsay tandem accelerators were extended to higher proton energies. Our experimental data for the last 3 targets are reported here and discussed with respect to previous data and the Murphy \textit{et al.} compilation [ApJS 183, 142 (2009)], as well as to predictions of the nuclear reaction code TALYS. The overall agreement between theory and experiment obtained in first-approach calculations using default input parameters of TALYS has been appreciably improved by using modified optical model potential (OMP), deformation, and level density parameters. The OMP parameters have been extracted from theoretical fits to available experimental elastic/inelastic nucleon scattering angular distribution data by means of the coupled-channels reaction code OPTMAN. Experimental data for several new $\gamma$-ray lines are also reported and discussed. The astrophysical implications of our results are emphasised., Comment: 22 pages, 10 figures, five tables; regular article submitted to Phys Rev C

Published
2020
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8. First observation of rotational bands in the nucleus $$^{231}$$U

Author

Roux, D. G., primary, Bark, R. A., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Ntshangase, S. S., additional, Dinoko, T. S., additional, Easton, J. L., additional, Jones, P., additional, Kheswa, B. V., additional, Khumalo, N. A., additional, Majola, S. N. T., additional, Masiteng, L. P., additional, Negi, D., additional, Noncolela, S. P., additional, Ndayishimye, J., additional, Sharpey-Schafer, J. F., additional, Shirinda, O., additional, and Uwitonze, P. C., additional

Published
2024
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9. Nuclear level densities and gamma-ray strength functions of $^{180,181,182}$Ta

Author

Brits, C. P., Malatji, K. L., Wiedeking, M., Kheswa, B. V., Goriely, S., Garrote, F. L. Bello, Bleuel, D. L., Giacoppo, F., Gorgen, A., Guttormsen, M., Hadynska-Klek, K., Hagen, T. W., Hilaire, S., Ingeberg, V. W., Jui, H., Klintefjord, M., Larsen, A. C., Majola, S. N. T., Papka, P., Peru, S., Qi, B., Renstrom, T., Rose, S. J., Sahin, E., Siem, S., Tveten, G. M., and Zeiser, F.

Subjects
Nuclear Experiment
Abstract

Particle-$\gamma$ coincidence experiments were performed at the Oslo Cyclotron Laboratory with the $^{181}$Ta(d,X) and $^{181}$Ta($^{3}$He,X) reactions, to measure the nuclear level densities (NLDs) and $\gamma$-ray strength functions ($\gamma$SFs) of $^{180, 181, 182}$Ta using the Oslo method. The Back-shifted Fermi-Gas, Constant Temperature plus Fermi Gas, and Hartree-Fock-Bogoliubov plus Combinatorial models where used for the absolute normalisations of the experimental NLDs at the neutron separation energies. The NLDs and $\gamma$SFs are used to calculate the corresponding $^{181}$Ta(n,$\gamma$) cross sections and these are compared to results from other techniques. The energy region of the scissors resonance strength is investigated and from the data and comparison to prior work it is concluded that the scissors strength splits into two distinct parts. This splitting may allow for the determination of triaxiality and a $\gamma$ deformation of $14.9^{\circ} \pm 1.8^{\circ}$ was determined for $^{181}$Ta.

Published
2019
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10. First observation of band structure in As76 : Possible chirality and octupole correlations

Author

Xu, W. Z., primary, Sun, D. P., additional, Wang, S. Y., additional, Bark, R. A., additional, Hua, H., additional, Meng, J., additional, Zhang, S. Q., additional, Jones, P., additional, Wyngaardt, S. M., additional, Liu, C., additional, Wang, S., additional, Li, G. Y., additional, Mu, L., additional, Bai, H. F., additional, Xiao, X., additional, Li, Z. Q., additional, Zhang, N. B., additional, Jia, H., additional, Guo, R. J., additional, Han, X. C., additional, Qi, B., additional, Niu, C. Y., additional, Wang, C. G., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Sharpey-Schafer, J. F., additional, Wiedeking, M., additional, Majola, S. N. T., additional, Bucher, T. D., additional, Dinoko, T., additional, Maqabuka, B., additional, Makhathini, L., additional, Mdletshe, L., additional, Khumalo, N. A., additional, Shirinda, O., additional, and Sowazi, K., additional

Published
2024
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11. Nuclear level densities and $\gamma$-ray strength functions of $^{87}\mathrm{Kr}$ -- First application of the Oslo Method in inverse kinematics

Author

Ingeberg, V. W., Siem, S., Wiedeking, M., Sieja, K., Bleuel, D. L., Brits, C. P., Bucher, T. D., Dinoko, T. S., Easton, J. L., Görgen, A., Guttormsen, M., Jones, P., Kheswa, B. V., Khumalo, N. A., Larsen, A. C., Lawrie, E. A., Lawrie, J. J., Majola, S. N. T., Malatji, K. L., Makhathini, L., Maqabuka, B., Negi, D., Noncolela, S. P., Papka, P., Sahin, E., Schwengner, R., Tveten, G. M., Zeiser, F., and Zikhali, B. R.

Subjects
Nuclear Experiment
Abstract

The $\gamma$-ray strength function ($\gamma$SF) and nuclear level density (NLD) have been extracted for the first time from inverse kinematic reactions with the Oslo Method. This novel technique allows measurements of these properties across a wide range of previously inaccessible nuclei. Proton-$\gamma$ coincidence events from the $\mathrm{d}(^{86}\mathrm{Kr}, \mathrm{p}\gamma)^{87}\mathrm{Kr}$ reaction were measured at iThemba LABS and the $\gamma$SF and NLD in $^{87}\mathrm{Kr}$ obtained. The low-energy region of the $\gamma$SF is compared to Shell Model calculations which suggest this region to be dominated by M1 strength. The $\gamma$SF and NLD are used as input parameters to Hauser-Feshbach calculations to constrain $(\mathrm{n},\gamma)$ cross sections of nuclei using the TALYS reaction code. These results are compared to $^{86}\mathrm{Kr}(n,\gamma)$ data from direct measurements., Comment: Submitted to EpJ A Letters

Published
2018
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12. Quasiparticle and $\gamma$-band structures in $^{156}$Dy

Author

Jehangir, S., Bhat, G. H., Sheikh, J. A., Frauendorf, S., Majola, S. N. T., Ganai, P. A., and Sharpey-Schafer, J. F.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Excited band structures recently observed in $^{156}$Dy are investigated using the microscopic triaxial projected shell model (TPSM) approach and the quasiparticle random phase approximation (QRPA) based on the rotating mean-field. It is demonstrated that new observed excited bands, tracking the ground-state band, are the $\gamma$-bands based on the excited two-quasineutron configurations as conjectured in the experimental work., Comment: 12 pages, 12 figures

Published
2017
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13. Nature of low-lying electric dipole resonance excitations in 74Ge

Author

Negi, D., Wiedeking, M., Lanza, E. G., Litvinova, E., Vitturi, A., Bark, R. A., Bernstein, L. A., Bleuel, D. L., Bvumbi, S., Bucher, T. D., Daub, B. H., Dinoko, T. S., Easton, J. L., Gorgen, A., Guttormsen, M., Jones, P., Kheswa, B. V., Khumalo, N. A., Larsen, A. C., Lawrie, E. A., Lawrie, J. J., Majola, S. N. T., Masiteng, L. P., Nchodu, M. R., Ndayishimye, J., Newman, R. T., Noncolela, S. P., Orce, J. N., Papka, P., Pellegri, L., Renstrøm, T., Roux, D. G., Schwengner, R., Shirinda, O., and Siem, S.

Subjects
Nuclear Experiment
Abstract

Isospin properties of dipole excitations in 74 Ge are investigated using the ({\alpha},{\alpha}'{\gamma}) reaction and compared to ({\gamma},{\gamma}) data. The results indicate that the dipole excitations in the energy region of 6 to 9 MeV adhere to the scenario of the recently found splitting of the region of dipole excitations into two separated parts: one at low energy, being populated by both isoscalar and isovector probes, and the other at high energy, excited only by the electromagnetic probe. Relativistic quasiparticle time blocking approximation (RQTBA) calculations show a reduction in the isoscalar E1 strength with an increase in excitation energy, which is consistent with the measurement., Comment: 7 pages, 7 figures

Published
2016
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14. The first candidate for chiral nuclei in the $A\sim80$ mass region: $^{80}$Br

Author

Wang, S. Y., Qi, B., Liu, L., Zhang, S. Q., Hua, H., Li, X. Q., Chen, Y. Y., Zhu, L. H., Meng, J., Wyngaardt, S. M., Papka, P., Ibrahim, T. T., Bark, R. A., Datta, P., Lawrie, E. A., Lawrie, J. J., Majola, S. N. T., Masiteng, P. L., Mullins, S. M., Gál, J., Kalinka, G., Molnár, J., Nyakó, B. M., Timár, J., Juhász, K., and Schwengner, R.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Excited states of $^{80}$Br have been investigated via the $^{76}$Ge($^{11}$B, $\alpha$3n) and $^{76}$Ge($^{7}$Li, 3n) reactions and a new $\Delta I$ = 1 band has been identified which resides $\sim$ 400 keV above the yrast band. Based on the experimental results and their comparison with the triaxial particle rotor model calculated ones, a chiral character of the two bands within the $\pi g_{9/2}\otimes \nu g_{9/2}$ configuration is proposed, which provides the first evidence for chirality in the $A\sim80$ region., Comment: 15 pages, 6 figures, accepted for publication in Physics Letters B

Published
2011
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15. First application of the Oslo method in inverse kinematics

Author

Ingeberg, V. W., Siem, S., Wiedeking, M., Sieja, K., Bleuel, D. L., Brits, C. P., Bucher, T. D., Dinoko, T. S., Easton, J. L., Görgen, A., Guttormsen, M., Jones, P., Kheswa, B. V., Khumalo, N. A., Larsen, A. C., Lawrie, E. A., Lawrie, J. J., Majola, S. N. T., Malatji, K. L., Makhathini, L., Maqabuka, B., Negi, D., Noncolela, S. P., Papka, P., Sahin, E., Schwengner, R., Tveten, G. M., Zeiser, F., and Zikhali, B. R.

Published
2020
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16. 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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17. Chirality and octupole correlations in As74

Author

Xiao, X., primary, Wang, S. Y., additional, Liu, C., additional, Bark, R. A., additional, Meng, J., additional, Zhang, S. Q., additional, Qi, B., additional, Hua, H., additional, Jones, P., additional, Wyngaardt, S. M., additional, Wang, S., additional, Sun, D. P., additional, Li, Z. Q., additional, Zhang, N. B., additional, Jia, H., additional, Guo, R. J., additional, Han, X. C., additional, Mu, L., additional, Lu, X., additional, Xu, W. Z., additional, Niu, C. Y., additional, Wang, C. G., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Sharpey-Schafer, J. F., additional, Wiedeking, M., additional, Majola, S. N. T., additional, Bucher, T. D., additional, Dinoko, T., additional, Maqabuka, B., additional, Makhathini, L., additional, Mdletshe, L., additional, Khumalo, N. A., additional, Shirinda, O., additional, and Sowazi, K., additional

Published
2022
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19. 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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20. 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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21. First evidence of an octupole rotational band in Ge isotopes

Author

Wang, C. G., primary, Han, R., additional, Xu, C., additional, Hua, H., additional, Bark, R. A., additional, Zhang, S. Q., additional, Wang, S. Y., additional, Shneidman, T. M., additional, Zhou, S. G., additional, Meng, J., additional, Wyngaardt, S. M., additional, Dai, A. C., additional, Xu, F. R., additional, Li, X. Q., additional, Li, Z. H., additional, Ye, Y. L., additional, Jiang, D. X., additional, Li, C. G., additional, Niu, C. Y., additional, Chen, Z. Q., additional, Wu, H. Y., additional, Luo, D. W., additional, Wang, S., additional, Sun, D. P., additional, Liu, C., additional, Li, Z. Q., additional, Zhang, N. B., additional, Guo, R. J., additional, Jones, P., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Sharpey-Schafer, J. F., additional, Wiedeking, M., additional, Majola, S. N. T., additional, Bucher, T. D., additional, Dinoko, T., additional, Maqabuka, B., additional, Makhathini, L., additional, Mdletshe, L., additional, Shirinda, O., additional, and Sowazi, K., additional

Published
2022
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23. Search for two-phonon octupole excitations in 146Gd

Author

Orce, J. N., Kumar Raju, M., Khumalo, N. A., Dinoko, T. S., Jones, P., Bark, R. A., Lawrie, E. A., Majola, S. N. T., Robledo, L. M., Rubio, B., Wiedeking, M., Easton, J., Khaleel, E. A., Kheswa, B. V., Kheswa, N., Herbert, M. S., Lawrie, J. J., Masiteng, P. L., Nchodu, M. R., Ndayishimye, J., Negi, D., Noncolela, S. P., Ntshangase, S. S., Papka, P., Roux, D. G., Shirinda, O., Sithole, P. S., and Yates, S. W.

Published
2016
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25. Reorientation-effect measurement of the 〈21+∥Ê2∥21+〉 matrix element in Ar36

Author

Orce, J. N., primary, Montes, E. J. Martín, additional, Abrahams, K. J., additional, Ngwetsheni, C., additional, Brown, B. A., additional, Raju, M. Kumar, additional, Mehl, C. V., additional, Mokgolobotho, M. J., additional, Akakpo, E. H., additional, Mavela, D. L., additional, Adsley, P., additional, Bark, R. A., additional, Bernier, N., additional, Bucher, T. D., additional, Erasmus, N. R., additional, Dinoko, T. S., additional, Jones, P. M., additional, Kheswa, N. Y., additional, Khumalo, N. A., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Lesch, B. L., additional, Majola, S. N. T., additional, Ntshangase, S. S., additional, Papka, P., additional, Pesudo, V., additional, Rebeiro, B., additional, Shirinda, O., additional, Wiedeking, M., additional, and Yahia-Cherif, W., additional

Published
2021
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26. 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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27. 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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28. First candidates for γ vibrational bands built on the [505]11/2⁻ neutron orbital in odd-A Dy isotopes

Author

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

Subjects
nuclear spin and parity, shell model, collective levels, hiukkasfysiikka, ydinfysiikka, nuclear structure and decays, nuclear fusion, nuclear reactions
Abstract

Rotational structures have been measured using the Jurogam II and GAMMASPHERE arrays at low spin following the 155Gd(α,2n)157Dy and 148Nd(12C,5n)155Dy 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-A155,157Dy isotopes. The coupling of the first excited K=0+ states or the so-called β vibrational bands at 661 and 676 keV in 154Dy and 156Dy to the [505]11/2− orbital, to produce a Kπ=11/2− band, was not observed in both 155Dy and 157Dy, respectively. The implication of these findings on the interpretation of the first excited 0+ states in the core nuclei 154Dy and 156Dy are also discussed. peerReviewed

Published
2020

29. First application of the Oslo method in inverse kinematics - Nuclear level densities and gamma-ray strength functions of 87Kr

Author

Ingeberg, V. W., Siem, S., Wiedeking, M., Sieja, K., Zeiser, F., Bleuel, D. L., Brits, C. P., Bucher, D. T., Dinoko, T. S., Easton, J. L., Görgen, A., Jones, P., Kheswa, B. V., Khumalo, N. A., Larsen, A. C., Lawrie, E. A., Lawrie, J. J., Majola, S. N. T., Malatji, K. L., Makhathini, L., Maqabuka, B., Negi, D., Noncolela, S. P., Papka, P., Sahin, E., Schwengner, R., Tveten, G. M., and Zikhali, B. R.

Subjects
(d, level density, Hauser-Feshbach model, shell model, inverse kinematics, Nuclear structure, gamma-ray strength function, Nuclear Experiment, nuclear reactions, p) recation, s-process
Abstract

A novel technique for extracting the gamma-ray strength function (SF) and nuclear level density (NLD) from inverse kinematics experiments is presented, which allows for measurements of these properties, across a vast range of previously inaccessible nuclei. Proton-gamma coincidence events from the d(86Kr, p)87Kr reaction were measured at iThemba LABS and the SF and NLD in 87 Kr obtained with the Oslo Method.The SF and NLD are important parameters in Hauser-Feshbach calculations to constrain (n,gamma) cross sections of nuclei for which these cannot be measured directly. The extracted SF and NLD are used as input in Hauser-Feshbach calculations to constrain the 86Kr(n,gamma)87Kr cross section which is important for the 87Rb production in the s-process. The nature of the low-energy region of the SF is explored through comparison to shell model calculations with the LNPS-SDG interaction.

Published
2020

30. Measurement and analysis of nuclear γ -ray production cross sections in proton interactions with Mg, Si, and Fe nuclei abundant in astrophysical sites over the incident energy range E=30–66 MeV

Author

Yahia-Cherif, W., primary, Ouichaoui, S., additional, Kiener, J., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Tatischeff, V., additional, Belhout, A., additional, Moussa, D., additional, Papka, P., additional, Benhabiles-Mezhoud, H., additional, Bucher, T. D., additional, Chafa, A., additional, Conradie, J. L., additional, Damache, S., additional, Debabi, M., additional, Deloncle, I., additional, Easton, J. L., additional, Hamadache, C., additional, Hammache, F., additional, Jones, P., additional, Kheswa, B. V., additional, Khumalo, N. A., additional, Lamula, T., additional, Majola, S. N. T., additional, Ndayishimye, J., additional, Negi, D., additional, Noncolela, S. P., additional, de Séréville, N., additional, Sharpey-Schafer, J. F., additional, Shirinda, O., additional, Wiedeking, M., additional, and Wyngaardt, S., additional

Published
2020
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31. First candidates for γ vibrational bands built on the [505]11/2− neutron orbital in odd- A Dy isotopes

Author

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

Published
2020
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32. 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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33. Spectroscopy of low-spin states in Dy157 : Search for evidence of enhanced octupole correlations

Author

Majola, S. N. T., primary, Bark, R. A., additional, Bianco, L., additional, Bucher, T. D., additional, Bvumbi, S. P., additional, Cullen, D. M., additional, Garrett, P. E., additional, Greenlees, P. T., additional, Hartley, D., additional, Hirvonen, J., additional, Jakobsson, U., additional, Jones, P. M., additional, Julin, R., additional, Juutinen, S., additional, Ketelhut, S., additional, Kheswa, B. V., additional, Korichi, A., additional, Lawrie, E. A., additional, Masiteng, P. L., additional, Maqabuka, B., additional, Mdletshe, L., additional, Minkova, A., additional, Ndayishimye, J., additional, Nieminen, P., additional, Newman, R., additional, Nyakó, B. M., additional, Ntshangase, S. S., additional, Peura, P., additional, Rahkila, P., additional, Riedinger, L. L., additional, Riley, M., additional, Roux, D., additional, Ruotsalainen, P., additional, Saren, J., additional, Sharpey-Schafer, J. F., additional, Scholey, C., additional, Shirinda, O., additional, Sithole, A., additional, Sorri, J., additional, Stolze, S., additional, Timár, J., additional, Uusitalo, J., additional, and Zimba, G., additional

Published
2019
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34. 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

35. High resolution 148Nd(3He,nγ) two proton stripping reaction and the structure of the 02+ state in 150Sm

Author

Sharpey-Schafer J. F., Papka P., Bvumbi S. P., Jones P. M, Vymers P., Bucher T. D., Dinoko T. S., Easton J. L., Herbert M. S., Kheswa B. V., Khumalo N., Lawrie E. A., Lawrie J. J., Majola S. N. T., Ndayishimye J., Negi D., Noncolela S. P., Orce J. N., Shirinda O., Sithole P., Standkiewicz M.A., and Wiedeking M.

Subjects
Physics, QC1-999
Abstract

The challenge of achieving high resolution in binary reactions involving an outgoing high energy neutron is solved by detecting the γ-ray decay of populated excited states in an array of escape suppressed HPGe detectors in coincidence with fast neutrons detected in a wall of scintillator detectors 2m down beam of the target. The selectivity of the arrangement is of the order of 1 in 1000. The time-of-flight difference is sufficient to separate fast neutrons from direct reactions from a large background of statistical neutrons from fusion-evaporation reactions. Our interest is in the wavefunction of the 02+ state at 740 keV in the N=88 nucleus 150Sm which, with the 02+ state in 100Ru, are the only two excited states observed in 2β2ν double β-decay.

Published
2014
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36. Spin-parity assignments and extension of the 02+ band in 158Er

Author

Dinoko T S, Orce J N, Sharpey-Schafer J F, Wiedeking M, Bark R A, Bvumbi S P, Jones P, Khaleel E A M A, Lawrie E A, Lawrie J J, Majola S N T, Masiteng P L, Mohammed H, Ntshangase S S, Papka P, Shirinda O, Stankiewicz M, and Zhou E N

Subjects
Physics, QC1-999
Abstract

Low and medium spin collective structures in 158Er have been studied using the 150Sm(12C,4nγγ) fusion-evaporation reaction at a beam energy of Elab = 65 MeV. A band built on the 02+ excitation has been established and extended to Jπ = 18+ from the analysis of γ-γ coincidence relationships, intensity arguments and DCO ratios. The 02+ band in 158Er presents a similar trend to the 02+ bands in the lighter N = 90 isotones but lies about 125 keV higher. This systematic trend supports a similar configuration for the 02+ bands in the N = 90 isotones.

Published
2013
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37. Study of 0+ States at iThemba LABS

Author

Jones P., Papka P., Sharpey-Shafer J.F., Vymers P., Bvumbi S. P., Bucher T. D., Dinoko T. S., Easton J. L., Herbert M. S., Kheswa B. V., Khumalo N., Lawrie E. A., Lawrie J. J., Majola S. N. T., Ndayishimye J., Negi D., Noncolela S. P., Orce J. N., Shirinda O., Sithole P., Stankiewicz M. A., and Wiedeking M.

Subjects
Physics, QC1-999
Abstract

An initial series of experiments utilising the (3He,n) reactions have been carried out at iThemba LABS. These are complimentary to transfer reactions such as (t,p) stripping or (p,t) pick-up reactions measurements using magnetic spectrometers. However, in the past, (3He,n) measurements have suffered from ambiguities due to the low energy resolution inbuilt into the time-of-flight techniques used. By combining neutron detection techniques with the AFRODITE γ-ray array, it has been shown that very good energy resolutions can be achieved. This enables the relative strengths of two proton stripping to excited states, separated by only a few keV, to be accurately measured. This technique has been applied to first excited 02+ states and, in particular to those uniquely seen in double β-decay.

Published
2013
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38. Competition of rotation around the intermediate and long axes in Tl193

Author

Ndayishimye, J., primary, Lawrie, E. A., additional, Shirinda, O., additional, Easton, J. L., additional, Lawrie, J. J., additional, Wyngaardt, S. M., additional, Bark, R. A., additional, Bucher, T. D., additional, Bvumbi, S. P., additional, Dinoko, T. R. S., additional, Jones, P., additional, Kheswa, N. Y., additional, Majola, S. N. T., additional, Masiteng, P. L., additional, Negi, D., additional, Orce, J. N., additional, Sharpey-Schafer, J. F., additional, and Wiedeking, M., additional

Published
2019
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39. Nuclear level densities and γ -ray strength functions of Ta180,181,182

Author

Brits, C. P., primary, Malatji, K. L., additional, Wiedeking, M., additional, Kheswa, B. V., additional, Goriely, S., additional, Garrote, F. L. Bello, additional, Bleuel, D. L., additional, Giacoppo, F., additional, Görgen, A., additional, Guttormsen, M., additional, Hadynska-Klek, K., additional, Hagen, T. W., additional, Hilaire, S., additional, Ingeberg, V. W., additional, Jia, H., additional, Klintefjord, M., additional, Larsen, A. C., additional, Majola, S. N. T., additional, Papka, P., additional, Péru, S., additional, Qi, B., additional, Renstrøm, T., additional, Rose, S. J., additional, Sahin, E., additional, Siem, S., additional, Tveten, G. M., additional, and Zeiser, F., additional

Published
2019
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41. Evolution from quasivibrational to quasirotational structure in Tm155 and yrast 27/2− to 25/2− energy anomaly in the A≈150 mass region

Author

Liu, L., primary, Wang, S. Y., additional, Wang, S., additional, Hua, H., additional, Zhang, S. Q., additional, Meng, J., additional, Bark, R. A., additional, Wyngaardt, S. M., additional, Qi, B., additional, Sun, D. P., additional, Liu, C., additional, Li, Z. Q., additional, Jia, H., additional, Li, X. Q., additional, Xu, C., additional, Li, Z. H., additional, Sun, J. J., additional, Zhu, L. H., additional, Jones, P., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Wiedeking, M., additional, Bucher, T. D., additional, Dinoko, T., additional, Makhathini, L., additional, Majola, S. N. T., additional, Noncolela, S. P., additional, Shirinda, O., additional, Gál, J., additional, Kalinka, G., additional, Molnár, J., additional, Nyakó, B. M., additional, Timár, J., additional, Juhász, K., additional, and Arogunjo, M., additional

Published
2018
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42. Spectroscopic study of the possibly triaxial transitional nucleus 75Ge

Author

Niu, C. Y., primary, Dai, A. C., additional, Xu, C., additional, Hua, H., additional, Zhang, S. Q., additional, Wang, S. Y., additional, Bark, R. A., additional, Meng, J., additional, Wang, C. G., additional, Wu, X. G., additional, Li, X. Q., additional, Li, Z. H., additional, Wyngaardt, S. M., additional, Zang, H. L., additional, Chen, Z. Q., additional, Wu, H. Y., additional, Xu, F. R., additional, Ye, Y. L., additional, Jiang, D. X., additional, Han, R., additional, Li, C. G., additional, Chen, X. C., additional, Liu, Q., additional, Feng, J., additional, Yang, B., additional, Wang, S., additional, Sun, D. P., additional, Liu, C., additional, Li, Z. Q., additional, Zhang, N. B., additional, Guo, R. J., additional, Li, G. S., additional, He, C. Y., additional, Zheng, Y., additional, Li, C. B., additional, Chen, Q. M., additional, Zhong, J., additional, Zhou, W. K., additional, Zhu, B. J., additional, Deng, L. T., additional, Liu, M. L., additional, Wang, J. G., additional, Jones, P., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Sharpey-Schafer, J. F., additional, Wiedeking, M., additional, Majola, S. N. T., additional, Bucher, T. D., additional, Dinoko, T., additional, Magabuka, B., additional, Makhathini, L., additional, Mdletshe, L., additional, Khumalo, N. A., additional, Shirinda, O., additional, and Sowazi, K., additional

Published
2018
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44. Investigation of negative-parity states in Dy156 : Search for evidence of tetrahedral symmetry

Author

Hartley, D. J., primary, Riedinger, L. L., additional, Janssens, R. V. F., additional, Majola, S. N. T., additional, Riley, M. A., additional, Allmond, J. M., additional, Beausang, C. W., additional, Carpenter, M. P., additional, Chiara, C. J., additional, Cooper, N., additional, Curien, D., additional, Gall, B. J. P., additional, Garrett, P. E., additional, Kondev, F. G., additional, Kulp, W. D., additional, Lauritsen, T., additional, McCutchan, E. A., additional, Miller, D., additional, Miller, S., additional, Piot, J., additional, Redon, N., additional, Sharpey-Schafer, J. F., additional, Simpson, J., additional, Stefanescu, I., additional, Wang, X., additional, Werner, V., additional, Wood, J. L., additional, Yu, C.-H., additional, Zhu, S., additional, and Dudek, J., additional

Published
2017
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45. Octupole correlations in N=88Dy154 : Octupole vibration versus stable deformation

Author

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

Published
2016
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46. Spectroscopy ofYb155: Structure evolution in theN=85isotones

Author

Li, X. Q., primary, Xu, C., additional, Zhang, S. Q., additional, Hua, H., additional, Meng, J., additional, Bark, R. A., additional, Chen, Q. B., additional, Niu, C. Y., additional, Han, R., additional, Wyngaardt, S. M., additional, Wang, S. Y., additional, Wang, S., additional, Qi, B., additional, Liu, L., additional, Zhu, L. H., additional, Shi, Z., additional, Zhang, G. L., additional, Sun, B. H., additional, Le, X. Y., additional, Song, C. Y., additional, Ye, Y. L., additional, Jiang, D. X., additional, Xu, F. R., additional, Li, Z. H., additional, Sun, J. J., additional, Shi, Y., additional, Zhao, P. W., additional, Liang, W. Y., additional, Li, C. G., additional, Wang, C. G., additional, Chen, X. C., additional, Sun, D. P., additional, Liu, C., additional, Li, Z. Q., additional, Jones, P., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Wiedeking, M., additional, Bucher, T. D., additional, Dinoko, T., additional, Kheswa, B. V., additional, Makhathini, L., additional, Majola, S. N. T., additional, Ndayishimye, J., additional, Noncolela, S. P., additional, Shirinda, O., additional, Gál, J., additional, Kalinka, G., additional, Molnár, J., additional, Nyakó, B. M., additional, Timár, J., additional, Juhász, K., additional, and Arogunjo, M., additional

Published
2016
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47. Nature of low-lying electric dipole resonance excitations inGe74

Author

Negi, D., primary, Wiedeking, M., additional, Lanza, E. G., additional, Litvinova, E., additional, Vitturi, A., additional, Bark, R. A., additional, Bernstein, L. A., additional, Bleuel, D. L., additional, Bvumbi, S., additional, Bucher, T. D., additional, Daub, B. H., additional, Dinoko, T. S., additional, Easton, J. L., additional, Görgen, A., additional, Guttormsen, M., additional, Jones, P., additional, Kheswa, B. V., additional, Khumalo, N. A., additional, Larsen, A. C., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Majola, S. N. T., additional, Masiteng, L. P., additional, Nchodu, M. R., additional, Ndayishimye, J., additional, Newman, R. T., additional, Noncolela, S. P., additional, Orce, J. N., additional, Papka, P., additional, Pellegri, L., additional, Renstrøm, T., additional, Roux, D. G., additional, Schwengner, R., additional, Shirinda, O., additional, and Siem, S., additional

Published
2016
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48. Statistical gamma-ray decay studies at iThemba LABS.

Author

Wiedeking, M., Bernstein, L. A., Bleuel, D. L., Brits, C. P., Sowazi, K., Görgen, A., Goldblum, B. L., Guttormsen, M., Kheswa, B. V., Larsen, A. C., Majola, S. N. T., Malatji, K. L., Negi, D., Nogwanya, T., Siem, S., and Zikhali, B. R.

Subjects
RADIOACTIVE decay, GAMMA ray detectors, PARTICLE telescopes, SILICON, ISOBARIC spin, NEUTRONS
Abstract

A program to study the γ -ray decay from the region of high-level density has been established at iThemba LABS, where a high-resolution gamma-ray detector array is used in conjunction with silicon particle-telescopes. Results from two recent projects are presented: 1) The 74Ge(α, α ' γ) reaction was used to investigate the Pygmy Dipole Resonance. The results were compared to (γ, γ ') data and indicate that the dipole states split into mixed isospin and relatively pure isovector excitations. 2) Data from the 95Mo(d,p) reaction were used to develop a novel method for the determination of spins for low-lying discrete levels utilizing statistical γ -ray decay in the vicinity of the neutron separation energy. These results provide insight into the competition of (γ, n) and (γ, γ ') reactions and highlights the need to correct for angular momentum barrier effects. [ABSTRACT FROM AUTHOR]

Published
2017
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49. Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Author

Liu, C., primary, Wang, S. Y., additional, Bark, R. A., additional, Zhang, S. Q., additional, Meng, J., additional, Qi, B., additional, Jones, P., additional, Wyngaardt, S. M., additional, Zhao, J., additional, Xu, C., additional, Zhou, S.-G., additional, Wang, S., additional, Sun, D. P., additional, Liu, L., additional, Li, Z. Q., additional, Zhang, N. B., additional, Jia, H., additional, Li, X. Q., additional, Hua, H., additional, Chen, Q. B., additional, Xiao, Z. G., additional, Li, H. J., additional, Zhu, L. H., additional, Bucher, T. D., additional, Dinoko, T., additional, Easton, J., additional, Juhász, K., additional, Kamblawe, A., additional, Khaleel, E., additional, Khumalo, N., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Majola, S. N. T., additional, Mullins, S. M., additional, Murray, S., additional, Ndayishimye, J., additional, Negi, D., additional, Noncolela, S. P., additional, Ntshangase, S. S., additional, Nyakó, B. M., additional, Orce, J. N., additional, Papka, P., additional, Sharpey-Schafer, J. F., additional, Shirinda, O., additional, Sithole, P., additional, Stankiewicz, M. A., additional, and Wiedeking, M., additional

Published
2016
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50. The first candidate for chiral nuclei in the A=80 mass region: 80Br

Author

Wang, S. Y., Qi, B., Zhang, S. Q., Hua, H., Li, X. Q., Zhu, L. H., Meng, J., Liu, L., Wyngaardt, S. M., Papka, P., Ibrahim, T. T., Bark, R. A., Datta, P., Lawrie, E. A., Lawrie, J. J., Majola, S. N. T., Masiteng, L. P., Mullins, S. M., Gal, J., Kalinka, G., Molnar, J., Nyako, B. M., Timar, J., Juhasz, K., and Schwengner, R.

Subjects
in-beam spectroscopy, particle-rotor model, Nuclear structure, chiral rotation
Abstract

Excited states of 80Br have been investigated via the 76Ge(11B, 3n) and 76Ge(7Li, 3n) reactions and a new I = 1 band has been identified which resides 400 keV above the yrast band. Based on the comparison between the experimental results and the triaxial particle rotor model calculations, a chiral character of the two bands within the pi g9/2 X nu g9/2 configuration is proposed, which provides the first evidence for chirality in the A 80 region.

Published
2011

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