27 results on '"Easton, J. L."'
Search Results
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
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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.
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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
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- 2022
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3. 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
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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.
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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
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- 2020
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4. First observation of rotational bands in the nucleus $$^{231}$$U
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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
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- 2024
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5. Nuclear level densities and $\gamma$-ray strength functions of $^{87}\mathrm{Kr}$ -- First application of the Oslo Method in inverse kinematics
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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.
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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
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- 2018
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6. Nature of low-lying electric dipole resonance excitations in 74Ge
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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.
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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
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- 2016
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7. 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
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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.
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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
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- 2015
8. First application of the Oslo method in inverse kinematics
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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.
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- 2020
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9. First application of the Oslo method in inverse kinematics - Nuclear level densities and gamma-ray strength functions of 87Kr
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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.
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(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.
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- 2020
10. 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
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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
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- 2020
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11. High resolution 148Nd(3He,nγ) two proton stripping reaction and the structure of the 02+ state in 150Sm
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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.
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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.
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- 2014
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12. Study of 0+ States at iThemba LABS
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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.
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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.
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- 2013
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13. Competition of rotation around the intermediate and long axes in Tl193
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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
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- 2019
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14. De-excitation of the strongly coupled band in 177Au and implications for core intruder configurations in the light Hg isotopes
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Venhart, M., Ali, F. A., Ryssens, W., Wood, J. L., Joss, D. T., Andreyev, A. N., Auranen, K., Bally, B., Balogh, M., Bender, M., Carroll, R. J., Easton, J. L., Greenlees, P. T., Grahn, T., Heenen, P.-H., Herzáifmmode ecknelse n, A., Jakobsson, U., Julin, R., Juutinen, S., Kifmmode lelse ifmmode eckcelse c, D., Konki, J., Lawrie, E., Leino, M., Matouifmmode eckselse sek, V., McPeake, C. G., O'Donnell, D., Page, R. D., Pakarinen, J., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., B., Sayifmmode gelse, Sedlák, M., Scholey, C., Sorri, J., Stolze, S., Thornthwaite, A., Uusitalo, J., Veselský, M., Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
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atomit ,nuklidit ,Nuclear Theory ,strongly coupled band ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,core intruder configurations ,Nuclear Experiment ,ydinfysiikka - Abstract
International audience; Excited states in the proton-unbound nuclide $^{177}$Au were populated in the $^92}$Mo($^{88}$Sr, p2n) reaction and identified using the Jurogam-II and GREAT spectrometers in conjunction with the RITU gas-filled separator at the University of Jyväskylä Accelerator Laboratory. A strongly coupled band and its decay path to the 11/2−α-decaying isomer have been identified using recoil-decay tagging. Comparisons with cranked Hartree-Fock-Bogoliubov (HFB) calculations based on Skyrme energy functionals suggest that the band has a prolate deformation and is based upon coupling the odd 1h11/2 proton hole to the excited 02+ configuration in the $^{178}$Hg core. Although these configurations might be expected to follow the parabolic trend of core Hg(02+) states as a function of neutron number, the electromagnetic decay paths from the strongly coupled band in $^{177}$Au are markedly different from those observed in the heavier isotopes above the midshell. This indicates that a significant change in the structure of the underlying A+1Hg core occurs below the neutron midshell.
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- 2017
15. Proportional crosstalk correction for the segmented clover at iThemba LABS
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Bucher, T D, primary, Noncolela, S P, additional, Lawrie, E A, additional, Dinoko, T R S, additional, Easton, J L, additional, Erasmus, N, additional, Lawrie, J J, additional, Mthembu, S H, additional, Mtshali, W X, additional, Shirinda, O, additional, and Orce, J N, additional
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- 2017
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16. De-excitation of the strongly coupled band in Au177 and implications for core intruder configurations in the light Hg isotopes
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Venhart, M., primary, Ali, F. A., additional, Ryssens, W., additional, Wood, J. L., additional, Joss, D. T., additional, Andreyev, A. N., additional, Auranen, K., additional, Bally, B., additional, Balogh, M., additional, Bender, M., additional, Carroll, R. J., additional, Easton, J. L., additional, Greenlees, P. T., additional, Grahn, T., additional, Heenen, P.-H., additional, Herzáň, A., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Kĺč, D., additional, Konki, J., additional, Lawrie, E., additional, Leino, M., additional, Matoušek, V., additional, McPeake, C. G., additional, O'Donnell, D., additional, Page, R. D., additional, Pakarinen, J., additional, Partanen, J., additional, Peura, P., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Sayği, B., additional, Sedlák, M., additional, Scholey, C., additional, Sorri, J., additional, Stolze, S., additional, Thornthwaite, A., additional, Uusitalo, J., additional, and Veselský, M., additional
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- 2017
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17. ANGULAR CORRELATION MEASUREMENT WITH THE iThemba LABS SEGMENTED CLOVER DETECTOR.
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SHIRINDA, O., LAWRIE, E. A., BUCHER, T. D., MTHEMBU, S. H., DINOKO, T. R. S., EASTON, J. L., MTSHALI, W. X., NONCOLELA, S. P., DUPREZ, D., and LAWRIE, J. J.
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ANGULAR measurements ,DETECTORS ,CLOVER - Abstract
Measurements of the angular correlation function W(θ) were performed with the iThemba LABS segmented clover detector. A set of measurements with radioactive sources and irradiated targets was carried out to check the performance of the detector. At short detector-to-source distance, the detector covers the whole range of angles needed for precise angular correlation measurements. Preliminary results show that our detector can measure precisely angular correlation functions, including for transitions with large multipole order such as E3, M4, E4, etc., and deliver mixing ratios of mixed magnetic and electric nature. [ABSTRACT FROM AUTHOR]
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- 2019
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18. Nature of low-lying electric dipole resonance excitations inGe74
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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
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- 2016
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19. CHIRAL BANDS IN 193Tl.
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NDAYISHIMYE, J., LAWRIE, E. A., SHIRINDA, O., EASTON, J. L., WYNGAARDT, S. M., BARK, R. A., BVUMBI, S. P., DINOKO, T. R. S., JONES, P., KHESWA, N. Y., LAWRIE, J. J., MAJOLA, S. N. T., MASITENG, P. L., NEGI, D., ORCE, J. N., PAPKA, P., SHARPEY-SCHAFER, J. F., STANKIEWICZ, M., and WIEDEKING, M.
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CHIRALITY of nuclear particles ,EXCITATION energy (In situ microanalysis) ,ENERGY bands ,SPECTRUM analysis ,TITANIUM isotopes - Abstract
A γ-spectroscopy study to search for chirality in
193 Tl was conducted. Three negative-parity bands with close excitation energies and almost equal B(M1)/B(E2) values were identified. These bands were associated with the same πh9=2 ⊗vi13=2 ² configuration which is suitable for chiral symmetry. Analysis of the properties of these bands suggested that one or two chiral systems are formed in193 Tl. [ABSTRACT FROM AUTHOR]- Published
- 2017
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20. PROPORTIONAL CROSSTALK FOR THE iThemba LABS CLOVER DETECTOR.
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NONCOLELA, S. P., BUCHER, T. D., LAWRIE, E. A., DINOKO, T. R. S., EASTON, J. L., ERASMUS, N., LAWRIE, J. J., MTHEMBU, S. H., MTSHALI, W. X., SHIRINDA, O., and ORCE, J. N.
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NUCLEAR counters ,ALGORITHMS ,GERMANIUM ,GAMMA rays ,CROSSTALK - Abstract
Measurements of the proportional crosstalk were performed for the iThemba LABS segmented clover detector. More than 1000 crosstalk parameters were determined and a crosstalk correction algorithm was implemented successfully. [ABSTRACT FROM AUTHOR]
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- 2017
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21. High resolution148Nd(3He,nγ) two proton stripping reaction and the structure of the 02+state in150Sm
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Sharpey-Schafer, J. F., primary, Papka, P., additional, Bvumbi, S. P., additional, Jones, P. M, additional, Vymers, P., additional, Bucher, T. D., additional, Dinoko, T. S., additional, Easton, J. L., additional, Herbert, M. S., additional, Kheswa, B. V., additional, Khumalo, N., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Majola, S. N. T., additional, Ndayishimye, J., additional, Negi, D., additional, Noncolela, S. P., additional, Orce, J. N., additional, Shirinda, O., additional, Sithole, P., additional, Standkiewicz, M.A., additional, and Wiedeking, M., additional
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- 2014
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22. Study of 0+States at iThemba LABS
- Author
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Jones, P., primary, Papka, P., additional, Sharpey-Shafer, J.F., additional, Vymers, P., additional, Bvumbi, S. P., additional, Bucher, T. D., additional, Dinoko, T. S., additional, Easton, J. L., additional, Herbert, M. S., additional, Kheswa, B. V., additional, Khumalo, N., additional, Lawrie, E. A., additional, Lawrie, J. J., additional, Majola, S. N. T., additional, Ndayishimye, J., additional, Negi, D., additional, Noncolela, S. P., additional, Orce, J. N., additional, Shirinda, O., additional, Sithole, P., additional, Stankiewicz, M. A., additional, and Wiedeking, M., additional
- Published
- 2013
- Full Text
- View/download PDF
23. 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., and Sithole, P.
- Subjects
MAGNETIC spectrometer ,MAGNETIC lens spectrometers ,NEUTRONS ,LOW energy electron diffraction ,GRAVITY assist (Astrodynamics) - 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 0
2 + states and, in particular to those uniquely seen in double β-decay. [ABSTRACT FROM AUTHOR]- Published
- 2013
- Full Text
- View/download PDF
24. Coulomb and Inelastic Excitations of Target Nuclei in (3He,n) Two Proton Stripping Reactions on 27Al, 59Co, 148Nd and 160Gd
- Author
-
Sharpey-Schafer, J. F., Papka, P., Jones, P. M., Vymers, P., Bark, R. A., Bucher, T. D., Bvumbi, S. P., Dinoko, T. S., Easton, J. L., Herbert, M. S., Kheswa, B. V., Khaleel, E. A. M. A., Khumalo, N., Lawrie, E. A., Lawrie, J. J., Majola, S. N. T., Ndayishimye, J., Nchodu, M. R., Negi, D., Noncolela, S. P., J. N. Orce, Shirinda, O., Sithole, P., and Wiedeking, M.
25. Competition of rotation around the intermediate and long axes in 193Tl.
- Author
-
Ndayishimye, J., Lawrie, E. A., Shirinda, O., Easton, J. L., Lawrie, J. J., Wyngaardt, S. M., Bark, R. A., Bucher, T. D., Bvumbi, S. P., Dinoko, T. R. S., Jones, P., Kheswa, N. Y., Majola, S. N. T., Masiteng, P. L., Negi, D., Orce, J. N., Sharpey-Schafer, J. F., and Wiedeking, M.
- Subjects
- *
AXES , *PARTICLES (Nuclear physics) , *SYMMETRY - Abstract
High-spin states in 193Tl were studied and the level scheme was revised and extended including the observation of new rotational bands. A surprising competition between bands built on the same πh9/2⊗νi13/2-2 nucleon configurations is observed. It is suggested that it is generated by two different rotational modes of this triaxial nucleus: (i) a rotation around the intermediate nuclear axis, producing a pair of chiral symmetry bands, and (ii) a rotation around the long nuclear axis, producing a third band with lower alignment. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
26. 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., Görgen, A., Guttormsen, M., Jones, P., Kheswa, B. V., Khumalo, N. A., Larsen, A. C., and Lawrie, E. A.
- Subjects
- *
GERMANIUM compounds , *ISOBARIC spin , *QUASIPARTICLES - Abstract
Isospin properties of dipole excitations in 74Ge are investigated using the (α,α′γ) reaction and compared to (γ,γ′) 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. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
27. Opportunistic screening for diabetes.
- Author
-
Easton JL and Segal L
- Subjects
- Aged, Diabetes Mellitus, Type 2 diagnosis, Diabetes Mellitus, Type 2 prevention & control, Female, Humans, Male, Middle Aged, Victoria, Diabetes Mellitus, Type 2 economics, Mass Screening economics
- Published
- 1998
- Full Text
- View/download PDF
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