17 results on '"Ngijoi-Yogo, E."'
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2. Nuclear shapes of highly deformed bands in Hf171,172 and neighboring Hf isotopes
- Author
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Janssens, R.V.F., Hartley, D.J., Ødegård, S., Chowdhury, P., Carpenter, M.P., Afanasjev, A.V., Yadav, R.B., Ma, W.C., Zhang, Y.C., Khoo, T.L., Djongolov, M.K., Cullen, D.M., Roux, D.G., Moore, E.F., Rigby, S.V., Kondev, F.G., Scholes, D.T., Riedinger, L.L., Zhu, S., Lauritsen, T., Zhang, J.-Y., Begnaud, J., Hagemann, G.B., and Ngijoi-Yogo, E.
- Abstract
A Gammasphere experiment was carried out to search for triaxial strongly deformed (TSD) structures in Hf171,172 and the wobbling mode, a unique signature of nuclei with stable triaxiality. Three strongly deformed bands in Hf172 and one in Hf171 were identified through Ca48(Te128, xn) reactions. Linking transitions were established for the band in Hf171 and, consequently, its excitation energies and spins (up to 111/2) were firmly established. However, none of the Hf172 sequences were linked to known structures. Experimental evidence of triaxiality was not observed in these bands. The new bands are compared with other known strongly deformed bands in neighboring Hf isotopes. Theoretical investigations within various models have been performed. Cranking calculations with the Ultimate Cranker code suggest that the band in Hf171 and two previously proposed TSD candidates in Hf170 and Hf175 are built on proton (i13/2h9/2) configurations, associated with near-prolate shapes and deformations enhanced with respect to the normal deformed bands. Cranked relativistic mean-field calculations suggest that band 2 in Hf175 has most likely a near-prolate superdeformed shape involving the πi13/2νj15/2 high-j intruder orbitals. It is quite likely that the bands in Hf172 are similar in character to this band.
- Published
- 2007
- Full Text
- View/download PDF
3. Collective Rotation and Vibration in Neutron-Rich Hf-180,Hf-182 Nuclei
- Author
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Ngijoi-Yogo, E., Tandel, S. K., Mukherjee, G., Shestakova, I., Chowdhury, P., Wu, C. Y., Cline, D., Hayes, A. B., Teng, R., Clark, R. M., Fallon, P., Macchiavelli, A. O., Vetter, K., Kondev, F. G., Langdown, S., Walker, P. M., Wheldon, C., and Dave Cullen
- Subjects
Nuclear Theory ,Nuclear Experiment - Abstract
High-spin states in neutron-rich Hf-180 and Hf-182 nuclei were populated through inelastic and transfer reactions with a Xe-136 beam incident on a thin Hf-180 target, and investigated using particle-gamma coincidence techniques. New collective band structures were observed, and previously known rotational and vibrational bands in these nuclei were extended to higher angular momenta. No obvious nucleon alignment was observed in the ground state band of either nucleus up to h omega=0.43 MeV, a significant delay compared to lighter even-even Hf isotopes. Woods-Saxon cranking calculations were performed to predict the nature of the first band crossings and shape evolution in Hf-180,Hf-182.
- Published
- 2007
4. Wobbling excitations in strongly deformed Hf nuclei?
- Author
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Tandel, S.K., MacChiavelli, A.O., Dracoulis, G.D., Goon, J., Cromaz, M., Aguilar, A., Janssens, R.V.F., Moore, E.F., Hagemann, G.B., Djongolov, M.K., Riedinger, L.L., Fallon, P., Cullen, D.M., Park, H.I., Campbell, D.B., Mukherjee, G., Walker, P.M., Laird, R.W., Lauritsen, T., Riley, M.A., Khoo, T.L., Zhang, J.-Y., Kondev, F.G., Sletten, G., Hartley, D.J., Ngijoi-Yogo, E., Danchev, M., McClain, B., Kaye, R.A., Bingham, C.R., Carpenter, M.P., and Chowdhury, P.
- Abstract
Two Gammasphere experiments have been performed in order to establish the possible triaxial nature of strongly deformed (SD) bands in 174Hf. A lifetime measurement, using the Doppler-shift attenuation method, confirmed the large deformation of the four previously observed bands in this nucleus with transition quadrupole moments ranging from 12.6 to 13.8 b. These values are significantly larger than those predicted for triaxial minima by ultimate cranker (UC) calculations. A thin-target, high-statistics experiment was also carried out to search for linking transitions between the SD bands. No such transitions, which represent an experimental signature for wobbling modes, were observed. Four additional SD bands were found in 174Hf together with a single SD band in 173Hf. These results indicate that the strongly deformed sequences of N≈102 Hf isotopes behave differently than the triaxial strongly deformed (TSD) bands found in Lu nuclei near N=92. The interpretation of these bands in terms of possible stable triaxial deformation is confronted with the experimental findings and UC predictions.
- Published
- 2005
- Full Text
- View/download PDF
5. Nuclear shapes of highly deformed bands in 171,172 Hf and neighboring Hf isotopes
- Author
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Zhang, Y.C., Ma, W. C., Afanasjev, A., Hagemann, Gudrun Bertram, Begnaud, J., Carpenter, M. P., Chowdhury, P., Cullen, D. M., Djongolov, M. K., Hartley, D. J., Janssens, R.V. F., Khoo, T. L., Kondev, E. G., Lauritsen, T., Moore, E.F., Ngijoi-Yogo, E., Ødegård, S., Riedinger, L. L., Rigby, S. V., Roux, D. G., Scholes, D. T., Yadav, R. B., Zhang, Jing-Ye, Zhu, S., Zhang, Y.C., Ma, W. C., Afanasjev, A., Hagemann, Gudrun Bertram, Begnaud, J., Carpenter, M. P., Chowdhury, P., Cullen, D. M., Djongolov, M. K., Hartley, D. J., Janssens, R.V. F., Khoo, T. L., Kondev, E. G., Lauritsen, T., Moore, E.F., Ngijoi-Yogo, E., Ødegård, S., Riedinger, L. L., Rigby, S. V., Roux, D. G., Scholes, D. T., Yadav, R. B., Zhang, Jing-Ye, and Zhu, S.
- Abstract
Udgivelsesdato: 28 Dec.
- Published
- 2008
6. Beyond Band Termination in 157 Er and the Search for Wobbling Excitations in Strongly Deformed 174 Hf
- Author
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Riley, M.A., Djongolov, M.K., Evans, Aaron, Hartley, D J, Janssens, R V F, Paul, E, Simpson, Jane, Aguilar, A. A, Appelbe, D., Bingham, C.R., Campbell, D.B., Carpenter, M P, Chowdhury, P, Choy, P T W, Clark, Robert Graham, Cromaz, M., Cullen, D M, Danchev, M., Dracoulis, George, Fallon, P, Gorgen, A, Hagemann, G B, Joss, D., Goon, J., Kaye, R A, Khoo, T, Kondev, Filip G, Laird, R W, Lagergren, K, Lauritsen, T, Macchiavelli, A O, McClain, B, Moore, E.F., Mukherjee, G, Ngijoi-Yogo, E, Nolan, P, Park, Hyoungshin, Pipidis, A, Riedinger, L L, Sletten, G, Tandel, S K, Walker, Philip M, Ward, D, Ragnarsson, I, Saric, F, Zhang, Jing-ye, Riley, M.A., Djongolov, M.K., Evans, Aaron, Hartley, D J, Janssens, R V F, Paul, E, Simpson, Jane, Aguilar, A. A, Appelbe, D., Bingham, C.R., Campbell, D.B., Carpenter, M P, Chowdhury, P, Choy, P T W, Clark, Robert Graham, Cromaz, M., Cullen, D M, Danchev, M., Dracoulis, George, Fallon, P, Gorgen, A, Hagemann, G B, Joss, D., Goon, J., Kaye, R A, Khoo, T, Kondev, Filip G, Laird, R W, Lagergren, K, Lauritsen, T, Macchiavelli, A O, McClain, B, Moore, E.F., Mukherjee, G, Ngijoi-Yogo, E, Nolan, P, Park, Hyoungshin, Pipidis, A, Riedinger, L L, Sletten, G, Tandel, S K, Walker, Philip M, Ward, D, Ragnarsson, I, Saric, F, and Zhang, Jing-ye
- Abstract
High-spin terminating bands in heavy nuclei were first identified in nuclei around 158Er90. While examples of special terminating states have been identified in a number of erbium isotopes, almost nothing is known about the states lying beyond band termination. In the present work the high-spin structure of 157Er has been studied using the Gammasphere spectrometer. The subject of triaxial superdeformation and 'wobbling' modes in Lu nuclei has rightly attracted a great deal of attention. Very recently, four strongly or superdeformed (SD) sequences have been observed in 174Hf and ultimate cranker calculations predict such structures may have significant triaxial deformation. We have performed two experiments in an attempt to verify the possible triaxial nature of these bands. A lifetime measurement was performed to confirm the large (and similar) deformation of the bands. In addition, a high-statistics, thin-target experiment was run to search for linking transitions between the SD bands and possible wobbling modes.
- Published
- 2005
7. Wobbling Excitations in Strongly Deformed Hf Nuclei?
- Author
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Hartley, D J, Djongolov, M.K., Riedinger, L L, Hagemann, G B, Janssens, R V F, Kondev, Filip G, Moore, E.F., Riley, M.A., Aguilar, A.A., Bingham, C.R., Campbell, D.B., Carpenter, M P, Chowdhury, P, Cromaz, M., Cullen, D M, Danchev, M., Dracoulis, George, Fallon, P, Goon, J., Kaye, R A, Khoo, T, Laird, R W, Lauritsen, T, Macchiavelli, A O, McClain, B, Mukherjee, G, Ngijoi-Yogo, E, Park, Hyoungshin, Sletten, G, Tandel, S K, Walker, Philip M, Zhang, Jing-ye, Hartley, D J, Djongolov, M.K., Riedinger, L L, Hagemann, G B, Janssens, R V F, Kondev, Filip G, Moore, E.F., Riley, M.A., Aguilar, A.A., Bingham, C.R., Campbell, D.B., Carpenter, M P, Chowdhury, P, Cromaz, M., Cullen, D M, Danchev, M., Dracoulis, George, Fallon, P, Goon, J., Kaye, R A, Khoo, T, Laird, R W, Lauritsen, T, Macchiavelli, A O, McClain, B, Mukherjee, G, Ngijoi-Yogo, E, Park, Hyoungshin, Sletten, G, Tandel, S K, Walker, Philip M, and Zhang, Jing-ye
- Abstract
Two Gammasphere experiments have been performed in order to establish the possible triaxial nature of strongly deformed (SD) bands in174Hf. A lifetime measurement, using the Doppler-shift attenuation method, confirmed the large deformation of the four previously observed bands in this nucleus with transition quadrupole moments ranging from 12.6 to 13.8 b. These values are significantly larger than those predicted for triaxial minima by ultimate cranker (UC) calculations. A thin-target, high-statistics experiment was also carried out to search for linking transitions between the SD bands. No such transitions, which represent an experimental signature for wobbling modes, were observed. Four additional SD bands were found in174Hf together with a single SD band in173Hf. These results indicate that the strongly deformed sequences of N≈102 Hf isotopes behave differently than the triaxial strongly deformed (TSD) bands found in Lu nuclei near N=92. The interpretation of these bands in terms of possible stable triaxial deformation is confronted with the experimental findings and UC predictions.
- Published
- 2005
8. Search for Wobbling Excitations in Hf Nuclei: Are the SD Bands Triaxial?
- Author
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Hartley, D J, Djongolov, M.K., Riedinger, L L, Hagemann, G B, Janssens, R V F, Kondev, Filip G, Moore, E.F., Aguilar, A.A., Bingham, C.R., Campbell, D.B., Carpenter, M P, Chowdhury, P, Cromaz, M., Cullen, D M, Danchev, M., Dracoulis, George, Fallon, P, Goon, J., Kaye, R A, Laird, R W, Khoo, T, Lauritsen, T, Macchiavelli, A O, McClain, B, Mukherjee, G, Ngijoi-Yogo, E, Sletten, G, Tandel, S K, Walker, Philip M, Zhang, Jing-ye, Riley, M.A., Park, H.I., Hartley, D J, Djongolov, M.K., Riedinger, L L, Hagemann, G B, Janssens, R V F, Kondev, Filip G, Moore, E.F., Aguilar, A.A., Bingham, C.R., Campbell, D.B., Carpenter, M P, Chowdhury, P, Cromaz, M., Cullen, D M, Danchev, M., Dracoulis, George, Fallon, P, Goon, J., Kaye, R A, Laird, R W, Khoo, T, Lauritsen, T, Macchiavelli, A O, McClain, B, Mukherjee, G, Ngijoi-Yogo, E, Sletten, G, Tandel, S K, Walker, Philip M, Zhang, Jing-ye, Riley, M.A., and Park, H.I.
- Abstract
Two Gammasphere experiments have been performed in order to establish the possible triaxial nature of strongly deformed (SD) bands in174Hf. A lifetime measurement confirmed the large deformation of the four previously observed bands in this nucleus. In addition, a thin-target, high-statistics experiment was carried out to search for linking transitions between the SD bands. No such transitions, which represent an experimental signature for wobbling modes, were observed. Four new SD bands were found in174Hf together with a single SD band in173Hf. These results indicate that the strongly deformed sequences of N ≈ 102 Hf isotopes behave differently than the TSD bands found in Lu nuclei near N = 92. The interpretation of these bands in terms of possible stable triaxial deformation is confronted with the experimental findings and UC predictions.
- Published
- 2005
9. Wobbling excitations in strongly deformed Hf nuclei?
- Author
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Hartley, DJ, Djongolov, MK, Riedinger, LL, Hagemann, GB, Janssens, RVF, Kondev, FG, Moore, EF, Riley, MA, Aguilar, A, Bingham, CR, Campbell, DB, Carpenter, MP, Chowdhury, P, Cromaz, M, Cullen, DM, Danchev, M, Dracoulis, GD, Fallon, P, Goon, J, Kaye, RA, Khoo, TL, Laird, RW, Lauritsen, T, Macchiavelli, AO, McClain, B, Mukherjee, G, Ngijoi-Yogo, E, Park, HI, Sletten, G, Tandel, SK, Walker, PM, Zhang, JY, Hartley, DJ, Djongolov, MK, Riedinger, LL, Hagemann, GB, Janssens, RVF, Kondev, FG, Moore, EF, Riley, MA, Aguilar, A, Bingham, CR, Campbell, DB, Carpenter, MP, Chowdhury, P, Cromaz, M, Cullen, DM, Danchev, M, Dracoulis, GD, Fallon, P, Goon, J, Kaye, RA, Khoo, TL, Laird, RW, Lauritsen, T, Macchiavelli, AO, McClain, B, Mukherjee, G, Ngijoi-Yogo, E, Park, HI, Sletten, G, Tandel, SK, Walker, PM, and Zhang, JY
- Published
- 2005
10. Nuclear shapes of highly deformed bands inHf171,172and neighboring Hf isotopes
- Author
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Zhang, Y. C., primary, Ma, W. C., additional, Afanasjev, A. V., additional, Hagemann, G. B., additional, Begnaud, J., additional, Carpenter, M. P., additional, Chowdhury, P., additional, Cullen, D. M., additional, Djongolov, M. K., additional, Hartley, D. J., additional, Janssens, R. V. F., additional, Khoo, T. L., additional, Kondev, F. G., additional, Lauritsen, T., additional, Moore, E. F., additional, Ngijoi-Yogo, E., additional, Ødegård, S., additional, Riedinger, L. L., additional, Rigby, S. V., additional, Roux, D. G., additional, Scholes, D. T., additional, Yadav, R. B., additional, Zhang, Jing-Ye, additional, and Zhu, S., additional
- Published
- 2007
- Full Text
- View/download PDF
11. Collective rotation and vibration in neutron-richHf180,182nuclei
- Author
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Ngijoi-Yogo, E., primary, Tandel, S. K., additional, Mukherjee, G., additional, Shestakova, I., additional, Chowdhury, P., additional, Wu, C. Y., additional, Cline, D., additional, Hayes, A. B., additional, Teng, R., additional, Clark, R. M., additional, Fallon, P., additional, Macchiavelli, A. O., additional, Vetter, K., additional, Kondev, F. G., additional, Langdown, S., additional, Walker, P. M., additional, Wheldon, C., additional, and Cullen, D. M., additional
- Published
- 2007
- Full Text
- View/download PDF
12. Observation of states beyond band termination in156, 157, 158Er and strongly deformed structures in173, 174, 175Hf
- Author
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Riley, M A, primary, Djongolov, M K, additional, Evans, A O, additional, Hartley, D J, additional, Janssens, R V F, additional, Paul, E S, additional, Pipidis, A, additional, Simpson, J, additional, Aguilar, A A, additional, Appelbe, D E, additional, Bingham, C R, additional, Campbell, D B, additional, Carpenter, M P, additional, Chowdhury, P, additional, Choy, P T W, additional, Clark, R M, additional, Cromaz, M, additional, Cullen, D M, additional, Danchev, M, additional, Dracoulis, G D, additional, Fallon, P, additional, Görgen, A, additional, Hagemann, G B, additional, Joss, D T, additional, Goon, J, additional, Kaye, R A, additional, Khoo, T L, additional, Kondev, F G, additional, Laird, R W, additional, Lagergren, K, additional, Lauritsen, T, additional, Macchiavelli, A O, additional, McClain, B, additional, Moore, E F, additional, Mukherjee, G, additional, Ngijoi-Yogo, E, additional, Nolan, P J, additional, Park, H I, additional, Riedinger, L L, additional, Sletten, G, additional, Tandel, S K, additional, Walker, P M, additional, Ward, D, additional, Ragnarsson, I, additional, Sarić, F, additional, and Zhang, Jing-ye, additional
- Published
- 2006
- Full Text
- View/download PDF
13. Beyond band termination in157Er and the search for wobbling excitations in strongly deformed174Hf
- Author
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Riley, M A, primary, Djongolov, M K, additional, Evans, A O, additional, Hartley, D J, additional, Janssens, R V F, additional, Paul, E S, additional, Simpson, J, additional, Aguilar, A A, additional, Appelbe, D E, additional, Bingham, C R, additional, Campbell, D B, additional, Carpenter, M P, additional, Chowdhury, P, additional, Choy, P T W, additional, Clark, R M, additional, Cromaz, M, additional, Cullen, D M, additional, Danchev, M, additional, Dracoulis, G D, additional, Fallon, P, additional, Görgen, A, additional, Hagemann, G B, additional, Joss, D T, additional, Goon, J, additional, Kaye, R A, additional, Khoo, T L, additional, Kondev, F G, additional, Laird, R W, additional, Lagergren, K, additional, Lauritsen, T, additional, Macchiavelli, A O, additional, McClain, B, additional, Moore, E F, additional, Mukherjee, G, additional, Ngijoi-Yogo, E, additional, Nolan, P J, additional, Park, H I, additional, Pipidis, A, additional, Riedinger, L L, additional, Sletten, G, additional, Tandel, S K, additional, Walker, P M, additional, Ward, D, additional, Ragnarsson, I, additional, Sarić, F, additional, and Zhang, Jing-ye, additional
- Published
- 2005
- Full Text
- View/download PDF
14. Wobbling excitations in strongly deformed Hf nuclei?
- Author
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Hartley, D.J., Djongolov, M.K., Riedinger, L.L., Hagemann, G.B., Janssens, R.V.F., Kondev, F.G., Moore, E.F., Riley, M.A., Aguilar, A., Bingham, C.R., Campbell, D.B., Carpenter, M.P., Chowdhury, P., Cromaz, M., Cullen, D.M., Danchev, M., Dracoulis, G.D., Fallon, P., Goon, J., Kaye, R.A., Khoo, T.L., Laird, R.W., Lauritsen, T., Macchiavelli, A.O., McClain, B., Mukherjee, G., Ngijoi-Yogo, E., Park, H.I., Sletten, G., Tandel, S.K., Walker, P.M., and Zhang, Jing-Ye
- Published
- 2005
- Full Text
- View/download PDF
15. Beyond band termination in 157Er and the search for wobbling excitations in strongly deformed 174Hf
- Author
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Riley, M MAR, Djongolov, M MKD, Evans, A AOE, Hartley, D DJH, Janssens, R RVF F, Paul, E ESP, Simpson, J JS, Aguilar, A AAA, Appelbe, D DEA, Bingham, C CRB, Campbell, D DBC, Carpenter, M MPC, Chowdhury, P PC, Choy, P PTW W, Clark, R RMC, Cromaz, M MC, Cullen, D DMC, Danchev, M MD, Dracoulis, G GDD, Fallon, P PF, Görgen, A AG, Hagemann, G GBH, Joss, D DTJ, Goon, J JG, Kaye, R RAK, Khoo, T TLK, Kondev, F FGK, Laird, R RWL, Lagergren, K KL, Lauritsen, T TL, Macchiavelli, A AOM, McClain, B BM, Moore, E EFM, Mukherjee, G GM, Ngijoi-Yogo, E EN, Nolan, P PJN, Park, H HIP, Pipidis, A AP, Riedinger, L LLR, Sletten, G GS, Tandel, S SKT, Walker, P PMW, Ward, D DW, Ragnarsson, I IR, Sarić, F FS, and Zhang, Jing-ye JZ
- Abstract
High-spin terminating bands in heavy nuclei were first identified in nuclei around 158Er90. While examples of special terminating states have been identified in a number of erbium isotopes, almost nothing is known about the states lying beyond band termination. In the present work the high-spin structure of 157Er has been studied using the Gammasphere spectrometer.The subject of triaxial superdeformation and ‘wobbling’ modes in Lu nuclei has rightly attracted a great deal of attention. Very recently, four strongly or superdeformed (SD) sequences have been observed in 174Hf and ultimate cranker calculations predict such structures may have significant triaxial deformation. We have performed two experiments in an attempt to verify the possible triaxial nature of these bands. A lifetime measurement was performed to confirm the large (and similar) deformation of the bands. In addition, a high-statistics, thin-target experiment was run to search for linking transitions between the SD bands and possible wobbling modes.
- Published
- 2005
16. Electrons from a 0.3s isomer in No-254
- Author
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Mukherjee, G., Khoo, Tl, Blinstrup, R., Seweryniak, D., Ahmad, I., Butler, Pa, Michael Patten Carpenter, Chowdhury, P., Cizewski, Ja, Davids, Cn, Freeman, Sj, Greene, Jp, Hammond, Nj, Heinz, A., Herzberg, Rd, Ikin, Pjc, Janssens, Rvf, Johnson, Ms, Jones, Gd, Kondev, Fg, Lauritsen, T., Lister, Cj, Moore, Ef, Ngijoi-Yogo, E., Reiter, P., and Sinha, S.
17. HEALTH PHYSICS STUDENT USE AND TESTING OF A NEW PORTABLE GAMMA SPECTROSCOPY SYSTEM.
- Author
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Simpson, D., Ngijoi-Yogo, E., Rundle, D., and Barvitskie, T.
- Subjects
SPECTRUM analysis - Abstract
An abstract of the article "Health Physics Student Use and Testing of a New Portable Gamma Spectroscopy System," by D. Simpson is presented.
- Published
- 2008
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