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415 results on '"Sharpey-Schafer, J. F."'

1. 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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2. 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. 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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10. 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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11. 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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12. Gamma ray production cross sections in proton induced reactions on natural Mg, Si and Fe targets over the proton energy range 30 up to 66 MeV

Author

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

Subjects
Nuclear Experiment
Abstract

Gamma-ray excitation functions have been measured for 30, 42, 54 and 66 MeV proton beams accelerated onto C + O (Mylar), Mg, Si, and Fe targets of astrophysical interest at the separate-sector cyclotron of iThemba LABS in Somerset West (Cape Town, South Africa). A large solid angle, high energy resolution detection system of the Eurogam type was used to record Gamma-ray energy spectra. Derived preliminary results of Gamma-ray line production cross sections for the Mg, Si and Fe target nuclei are reported and discussed. The current cross section data for known, intense Gamma-ray lines from these nuclei consistently extend to higher proton energies previous experimental data measured up to Ep ~ 25 MeV at the Orsay and Washington tandem accelerators. Data for new Gamma-ray lines observed for the first time in this work are also reported., Comment: 11 pages, 6 figures. IOP Institute of Physics Conference Nuclear Physics in Astrophysics VII, 28th EPF Nuclear Physics Divisional Conference, May 18-22 2015, York, UK

Published
2015

13. Evolution of structure and shapes in Er158 to ultrahigh spin

Author

Simpson, J., primary, Riley, M. A., additional, Pipidis, A., additional, Paul, E. S., additional, Wang, X., additional, Nolan, P. J., additional, Sharpey-Schafer, J. F., additional, Aguilar, A., additional, Appelbe, D. E., additional, Ayangeakaa, A. D., additional, Boston, A. J., additional, Boston, H. C., additional, Campbell, D. B., additional, Carpenter, M. P., additional, Chiara, C. J., additional, Choy, P. T. W., additional, Clark, R. M., additional, Cromaz, M., additional, Evans, A. O., additional, Fallon, P., additional, Garg, U., additional, Görgen, A., additional, Hartley, D. J., additional, Janssens, R. V. F., additional, Joss, D. T., additional, Judson, D. S., additional, Kondev, F. G., additional, Lauritsen, T., additional, Lee, I. Y., additional, Macchiavelli, A. O., additional, Matta, J. T., additional, Ollier, J., additional, Petri, M., additional, Revill, J. P., additional, Riedinger, L. L., additional, Rigby, S. V., additional, Teal, C., additional, Twin, P. J., additional, Unsworth, C., additional, Ward, D., additional, Zhu, S., additional, and Ragnarsson, I., additional

Published
2023
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14. 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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15. A proton pairing isomer in 174Hf: Reinterpretation of data and support for the split prolate–oblate pairing approximation for deformed nuclei.

Author

Sharpey-Schafer, J. F.

Subjects
*ISOMERS, *PROTONS, *FERMI surfaces
Abstract

The available data on the even–even isotope 174Hf are reinterpreted to conclude that the low-lying 02+ level, usually regarded as a "β vibration", is actually a proton (2p–2 h) excitation known as a Pairing Isomer. This is the first identification of a Pairing Isomer based on Proton Nilsson Orbitals. Its identification demonstrates that Pairing Isomers can exist anywhere in the Nuclear Chart if the positioning of the Fermi Surface is favourable with respect to relevant Nilsson orbitals. [ABSTRACT FROM AUTHOR]

Published
2023
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16. Relative spins and excitation energies of superdeformed bands in 190Hg: Further evidence for octupole vibration

Author

Crowell, B., Carpenter, M. P., Janssens, R. V. F., Blumenthal, D. J., Timar, Wilson, A. N., Sharpey-Schafer, J. F., Nakatsukasa, T., Ahmad, I., Astier, A., Azaiez, F., Croux, L. du, Gall, B. J. P., Hannachi, F., Khoo, T. L., Korichi, A., Lauritsen, T., Lopez-Martens, A., Meyer, M., Nisius, D., Paul, E. S., Porquet, M. G., and Redon, N.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

An experiment using the Eurogam Phase II gamma-ray spectrometer confirms the existence of an excited superdeformed (SD) band in 190Hg and its very unusual decay into the lowest SD band over 3-4 transitions. The energies and dipole character of the transitions linking the two SD bands have been firmly established. Comparisons with RPA calculations indicate that the excited SD band can be interpreted as an octupole-vibrational structure., Comment: 12 pages, latex, 4 figures available via WWW at http://www.phy.anl.gov/bgo/bc/hg190_nucl_ex.html

Published
1994
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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. DSAM lifetime measurements for the chiral pair in 194Tl

Author

Masiteng, P. L., Pasternak, A. A., Lawrie, E. A., Shirinda, O., Lawrie, J. J., Bark, R. A., Bvumbi, S. P., Kheswa, N. Y., Lindsay, R., Lieder, E. O., Lieder, R. M., Madiba, T. E., Mullins, S. M., Murray, S. H. T., Ndayishimye, J., Ntshangase, S. S., Papka, P., and Sharpey-Schafer, J. F.

Published
2016
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24. Study of Mass A=130 Fission Fragments in the 14n + 238U Reaction at 10 MeV/A

Author

Balabanski, D. L., Minkova, A., Rainovski, G. I., Danchev, M., Erduran, N., Akkus, B., Bostan, M., Gurdal, G., Yalcinkaya, M., Beetge, R., Fearick, R. W., Mabala, G., Roux, D., Whittaker, W., Babu, B. R. S., Lawrie, J. J., Naguleswaran, S., Newman, R. T., Pilcher, J. V., Smit, F. D., Sharpey-Schafer, J. F., Smit, F. D., editor, Lindsay, R., editor, and Förtsch, S. V., editor

Published
1999
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25. First Identification of High Spin States in 164Ta

Author

Babu, B. R. S., Lawrie, J. J., Roux, D. G., Aschman, D. G., Beetge, R., Fetea, M., Mabala, G. K., Naguleswaran, S., Nazmitdinov, R., Newman, R. T., Rigollet, C., Sharpey-Schafer, J. F., Smit, F. D., Whittaker, W., Smit, F. D., editor, Lindsay, R., editor, and Förtsch, S. V., editor

Published
1999
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27. 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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28. Rotational bands and chirality in 194Tl

Author

Masiteng, P. L., Lawrie, E. A., Ramashidzha, T. M., Lawrie, J. J., Bark, R. A., Lindsay, R., Komati, F., Kau, J., Maine, P., Maliage, S. M., Matamba, I., Mullins, S. M., Murray, S. H. T., Mutshena, K. P., Pasternak, A. A., Roux, D. G., Sharpey-Schafer, J. F., Shirinda, O., and Vymers, P. A.

Published
2014
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29. 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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32. Candidate chiral bands in 198Tl

Author

Lawrie, E. A., Vymers, P. A., Vieu, Ch., Lawrie, J. J., Schück, C., Bark, R. A., Lindsay, R., Mabala, G. K., Maliage, S. M., Masiteng, P. L., Mullins, S. M., Murray, S. H. T., Ragnarsson, I., Ramashidzha, T. M., Sharpey-Schafer, J. F., and Shirinda, O.

Published
2010
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33. 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

36. 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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37. 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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38. Rotational structures in Hg196

Author

Lawrie, J. J., primary, Lawrie, E. A., additional, Msezane, B., additional, Benatar, M., additional, Fedderke, M., additional, Mabala, G. K., additional, Mukherjee, S., additional, Mullins, S. M., additional, Mutshena, K. P., additional, Ncapayi, N. J., additional, Newman, R. T., additional, Sharpey-Schafer, J. F., additional, Smit, F. D., additional, and Vymers, P., additional

Published
2019
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39. Nuclear shape coexistence in 194Hg

Author

Fotiades, N., primary, Harissopulos, S., additional, Kalfas, C. A., additional, Kossionides, S., additional, Papadopoulos, C. T., additional, Vlastou, R., additional, Serris, M., additional, Sharpey-Schafer, J. F., additional, Joyce, M. J., additional, Beausang, C. W., additional, Dagnall, P. J., additional, Forsyth, P. D., additional, Gale, S. J., additional, Jones, P. M., additional, Paul, E. S., additional, Twin, P. J., additional, Simpson, J., additional, Cullen, D. M., additional, Fallon, P., additional, Riley, M. A., additional, Clark, R. M., additional, Hauschild, K., additional, and Wadsworth, R., additional

Published
2019
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40. High spin structure of 155Dy

Author

Papadopoulos, C. T., primary, Vlastou, R., additional, Serris, M., additional, Kalfas, C. A., additional, Fotiades, N., additional, Harissopulos, S., additional, Kosslonides, S., additional, Rilley, M. A., additional, Simpson, J., additional, Paul, E. S., additional, and Sharpey-Schafer, J. F., additional

Published
2019
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41. 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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42. “Stapler” mechanism for a dipole band in Se79

Author

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

Published
2019
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43. 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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44. Octupole vibrations of the superdeformed196Pb nucleus

Author

Azaiez, F., Bouneau, S., Duprat, J., Deloncle, I., Porquet, M-G., van Severen, U. J., Nakatsukasa, T., Aleonard, M. M., Astier, A., Baldsiefen, S., Beausang, C. W., Beck, F. A., Bourgeois, C., Curien, D., Dozie, N., Ducroux, L., Gall, B., Hubel, H., Kaci, M., Korten, W., Meyer, M., Redon, N., Sergolle, H., and Sharpey-Schafer, J. F.

Published
1997
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45. High spin structures of 122Xe

Author

Serris, M., Papadopoulos, C. T., Vlastou, R., Kalfas, C. A., Kossionides, S., Fotiades, N., Harissopulos, S., Beausang, C. W., Joyce, M. J., Paul, E. S., Bentley, M. A., Araddad, S., Simpson, J., and Sharpey-Schafer, J. F.

Published
1997
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46. High spin structures in194Hg

Author

Fotiades, N., Harissopulos, S., Kalfas, C. A., Kossionides, S., Papadopoulos, C. T., Vlastou, R., Serris, M., Sharpey-Schafer, J. F., Joyce, M. J., Beausang, C. W., Dagnall, P. J., Forsyth, P. D., Gale, S. J., Jones, P. M., Paul, E. S., Twin, P. J., Simpson, J., Cullen, D. M., Fallon, P., Riley, M. A., Clark, R. M., Hauschild, K., and Wadsworth, R.

Published
1996
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47. Dipole bands in the oblate-shaped195Pb

Author

Kaci, M., Porquet, M -G., Hannachi, F., Aïche, M., Bastin, G., Deloncle, I., Gall, B. J. P., Schück, C., Azaiez, F., Beausang, C. W., Bourgeois, C., Clark, R. M., Duffait, R., Duprat, J., Hauschild, K., Joyce, M. J., Korichi, A., Le Coz, Y., Meyer, M., Paul, E. S., Perrin, N., Poffé, N., Redon, N., Sergolle, H., Sharpey-Schafer, J. F., Simpson, J., Smith, A. G., and Wadsworth, R.

Published
1996
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48. Dipole bands and multi-quasiparticle excitations in193Pb

Author

Ducroux, L., Astier, A., Duffait, R., Le Coz, Y., Meyer, M., Perries, S., Redon, N., Sharpey-Schafer, J. F., Wilson, A. N., Lucas, R., Méot, V., Collatz, R., Deloncle, I., Hannachi, F., Lopez-Martens, A., Porquet, M. G., Schück, C., Azaiez, F., Bouneau, S., Bourgeois, C., Korichi, A., Poffé, N., Sergolle, H., Gall, B. J. P., Hibbert, I., and Wadsworth, R.

Published
1996
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49. 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

50. 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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