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133 results on '"Tandel, S. K."'

1. In-beam $\gamma-$spectroscopy of the transitional nucleus $^{217}$Ac

Author

Sahoo, Dhananjaya, Deo, A. Y., Madhu, Yadav, Khamosh, Tiwary, S. S., Srivastava, P. C., Palit, R., Tandel, S. K., Kumar, Anil, Dey, P., Das, Biswajit, Malik, Vishal, Kundu, A., Sindhu, A., Jadhav, S. V., Naidu, B. S., and Thomas, A. V.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

High-spin states in the transitional $^{217}$Ac nucleus are established up to 3.8 MeV excitation energy and $I^{\pi} =$ 41/2$^+$ with the addition of around 20 new transitions. The structure of the yrast and near-yrast states below the 29/2$^+$ isomer is revisited. The inconsistencies in the level schemes reported earlier are resolved. The level structure above the 29/2$^+$ isomer is established for the first time. Large-basis shell-model calculations with the KHPE interaction are performed to compare the experimentally observed level energies with the theoretical predictions. A comparison with the systematics of the N = 128 isotones suggests that the yrast structures result from a weak coupling of the odd proton to the even-even 216Ra core, which is consistent with the shell-model configurations. Furthermore, alpha decay of the 29/2$^+$ isomer is revisited and the decay scheme established from this work is discussed in the framework of the shell model., Comment: 11 pages, 9 figures

Published
2024

3. Coexisting single-particle excitations and octupole correlations in transitional nucleus $\mathbf{^{217}Ra}$

Author

Madhu, Deo, A. Y., Yadav, Khamosh, Sahoo, Dhananjaya, Wang, Y. Y., Wang, Y. K., Meng, J., Suman, Saket, Tandel, S. K., Sharma, A., Ahmed, I., Katre, K., Devi, K. Rojeeta, Dutt, S., Kumar, S., Yashraj, Muralithar, S., and Singh, R. P.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The level structure of the transitional nucleus $\mathrm{^{217}Ra}$ has been extended with the addition of around 20 new transitions. The discrepancies between the placements of several transitions reported in the earlier studies are resolved. The newly-established negative-parity sequence at low excitation energies hints at the expected parity-doublet structures in this nucleus. The properties of the observed simplex bands are compared with that of similar bands in neighboring nuclei. Since the presence of parity-doublet structures reflect octupole correlations, theoretical calculations using reflection-asymmetric triaxial particle rotor model (RAT-PRM) have been performed. A comparison of the observed features of the simplex bands with the predictions of the RAT-PRM calculations suggests that $\mathrm{^{217}Ra}$ exhibits an intermediate the behavior between the extremes of spherical and octupole-deformed nuclei. The termination of the simplex bands at intermediate energies and the structures lying above reflect the dominance of the single-particle excitations at higher excitation energies., Comment: 15 pages, 16 figures

Published
2023
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4. High-spin spectroscopy in $^{207}$At: Evidence of a 29/2$^{+}$ isomeric state

Author

Yadav, Khamosh, Deo, A. Y., Madhu, Sahoo, Dhananjaya, Srivastava, P. C., Suman, Saket, Tandel, S. K., Sharma, A., Ahmed, I., Katre, K., Devi, K. Rojeeta, Dutt, Sunil, Kumar, Sushil, Yashraj, Muralithar, S., and Singh, R. P.

Subjects
Nuclear Experiment
Abstract

Yrast and near-yrast states above the known 25/2$^{+}$ isomer in $^{207}$At are established for the first time. The level scheme is extended up to 47/2$\hbar$ and 6.5 MeV with the addition of about 60 new $\gamma$-ray transitions. The half-life of the 25/2$^{+}$ isomer is revisited and a value of $T_{1/2}$ = 107.5(9) ns is deduced. Evidence of a hitherto unobserved 29/2$^{+}$ isomer in $^{207}$At is presented. A systematic study of $B(E3)$ values for the transitions de-exciting the 29/2$^{+}$ isomer in the neighboring odd-$A$ At isotopes suggests a half-life in the 2$-$4.5 $\mu$s range for this state in $^{207}$At. The experimental results are compared with large-scale shell-model calculations performed using the KHM3Y effective interaction in the $Z$ = 50$-$126, $N$ = 82$-$184 model space and an overall good agreement is noted between the theory and the experiment. A qualitative comparison of the excited states and the isomers with analogous states in neighboring nuclei provides further insight into the structure of $^{207}$At., Comment: 16 pages, 14 figures

Published
2022
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5. Emergence of an island of extreme nuclear isomerism at high excitation near $^{208}$Pb

Author

Wahid, S. G., Tandel, S. K., Suman, Saket, Srivastava, P. C., Kumar, Anil, Chowdhury, P., Kondev, F. G., Janssens, R. V. F., Carpenter, M. P., Lauritsen, T., Seweryniak, D., and Zhu, S.

Subjects
Nuclear Experiment
Abstract

Metastable states with T$_{1/2}$ = 8(2) ms in $^{205}$Bi and T$_{1/2}$ = 0.22(2) ms in $^{204}$Pb, with $\approx $ 8 MeV excitation energy and angular momentum $\ge $ 22 $\hbar $, have been established. These represent, by up to two orders of magnitude, the longest-lived nuclear states above an excitation energy of 7 MeV, ever identified in the nuclear chart. Additionally, the half-life of the 10.17 MeV state in $^{206}$Bi has been determined to be 0.027(2) ms, the next highest value in this highly excited regime. These observations indicate the emergence of an island of extreme nuclear isomerism arising from core-excited configurations at high excitation in the vicinity of the doubly closed-shell nucleus $^{208}$Pb. These results are expected to provide discriminating tests of the effective interactions used in current large-scale shell-model calculations., Comment: 17 pages, 5 figures

Published
2022
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6. Shapes, Softness and Non-Yrast Collectivity in 186W

Author

Prasher, V. S., Mitchell, A. J., Lister, C. J., Chowdhury, P., Afanasieva, L., Albers, M., Chiara, C. J., Carpenter, M. P., Cline, D., D'Olympia, N., Guess, C. J., Hayes, A. B., Hoffman, C. R., Janssens, R. V. F., Kay, B. P., Khoo, T. L., Korichi, A., Lauritsen, T., Merchan, E., Qiu, Y., Seweryniak, D., Shearman, R., Tandel, S. K., Verras, A., Wu, C. Y., and Zhu, S.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Non-yrast, excited states in neutron-rich $^{186}$W were populated via inelastic-scattering reactions using beams of $^{136}$Xe nuclei accelerated to 725 and 800 MeV. Levels populated in the reactions were investigated via particle-$ \gamma $ coincidence techniques using the Gammasphere array of High-Purity Germanium detectors and the compact heavy-ion counter, CHICO2. The $ K^{\pi} = 2 ^{+} $ ($\gamma$), $ K^{\pi} = 0^{+}$ and $ K^{\pi} = 2^{-} $ (octupole) rotational side bands were extended to spins $ 14\hbar $, $ 12\hbar $, and $ 13\hbar $, respectively. A staggering pattern observed in the energies of levels in the $ K^{\pi} = 2^{+} $ band was found to be consistent with a potential that gets softer to vibration in the $ \gamma $ degree of freedom with increasing spin. The odd-even staggering of states in the $ K^{\pi} = 2^{-}$ band was found to exhibit a phase opposite to that seen in the $ \gamma $ band; an effect most probably associated with Coriolis coupling to other, unobserved octupole vibrational bands in $^{186}$W., Comment: 14 pages, 16 figures

Published
2021
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7. Isomers in 203Tl and core excitations built on a five-nucleon-hole structure

Author

Bothe, V., Tandel, S. K., Wahid, S. G., Srivastava, P. C., Bhoy, Bharti, Chowdhury, P., Janssens, R. V. F., Kondev, F. G., Carpenter, M. P., Lauritsen, T., Seweryniak, D., and Zhu, S.

Subjects
Nuclear Experiment
Abstract

Isomers with three- and five-nucleon-hole configurations have been established in $^{203}$Tl. These include newly identified levels with a three-nucleon structure: {\it I}$^{\pi }$ = (15/2$^{-}$) with {\it T}$_{1/2}$ = 7.9(5) ns, and {\it I}$^{\pi }$ = (35/2$^{-}$) with {\it T}$_{1/2}$ = 4.0(5) ns. In addition, five-quasiparticle states: {\it I}$^{\pi }$ = (39/2$^{-}$) with {\it T}$_{1/2}$ = 1.9(2) ns, and {\it I}$^{\pi }$ = (49/2$^{+}$) with {\it T}$_{1/2}$ = 3.4(4) ns have also been established. The previously determined long-lived decay [{\it T}$_{1/2}$ = 6.6(3) $\mu $s from this work] is associated with isomerism of the {\it I}$^{\pi }$ = (29/2$^{+}$) state. Levels above this long-lived isomer have been identified through a delayed-prompt coincidence measurement. Five-nucleon-hole states with excitation energies {\it E}$_{x}$ $\approx $ 7 MeV have been established as well as possible octupole excitations of the $^{208}$Pb core built on these levels. The level scheme of $^{203}$Tl is extended up to {\it E}$_{x}$ $\approx $ 11 MeV with the inclusion of 25 new transitions. Empirical and shell-model calculations have been performed to aid in the description of the observed states which are found to be predominantly of intrinsic character., Comment: 14 pages, 10 figures

Published
2021
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10. Observation of a $\gamma$-band based on two-quasiparticle configuration in $^{70}$Ge

Author

Raju, M. Kumar, Rao, P. V. Madhusudhana, Muralithar, S., Singh, R. P., Bhat, G. H., Sheikh, J. A., Tandel, S. K., Sugathan, P., Reddy, T. Seshi, Rao, B. V. Thirumala, and Bhowmik, R. K.

Subjects
Nuclear Experiment
Abstract

The structure of $^{70}$Ge has been studied through in-beam gamma ray spectroscopy. A new band structure is identified that leads to forking of the ground-state band into two excited bands. Band structures have been investigated using the microscopic triaxial projected shell model approach. The observed forking is demonstrated to result from almost simultaneous band crossing of the two neutron aligned and the \gamma-band built on this two-quasiparticle configuration with the ground-state band., Comment: 9 pages, 13 figures, Accepted for publication as a Regular Article in PRC. in Physical Review C, 24th Feb 2016

Published
2016
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11. Transverse Wobbling in $^{135}$Pr

Author

Matta, J. T., Garg, U., Li, W., Frauendorf, S., Ayangeakaa, A. D., Patel, D., Schlax, K. W., Palit, R., Saha, S., Sethi, J., Trivedi, T., Ghugre, S. S., Raut, R., Sinha, A. K., Janssens, R. V. F., Zhu, S., Carpenter, M. P., Lauritsen, T., Seweryniak, D., Chiara, C. J., Kondev, F. G., Hartley, D. J., Petrache, C. M., Mukhopadhyay, S., Lakshmi, D. Vijaya, Raju, M. Kumar, Rao, P. V. Madhusudhana, Tandel, S. K., Ray, S., and Dönau, F.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

A pair of transverse wobbling bands has been observed in the nucleus $^{135}$Pr. The wobbling is characterized by $\Delta I$ =1, E2 transitions between the bands, and a decrease in the wobbling energy confirms its transverse nature. Additionally, a transition from transverse wobbling to a three-quasiparticle band comprised of strong magnetic dipole transitions is observed. These observations conform well to results from calculations with the Tilted Axis Cranking (TAC) model and the Quasiparticle Triaxial Rotor (QTR) Model., Comment: 6 pages; 5 figures; accepted for publication in the Physical Review Letters

Published
2015
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13. Multi-quasiparticle structures up to spin $\sim{44}\hbar$ in the odd-odd nucleus $^{168}$Ta

Author

Wang, X., Hartley, D. J., Riley, M. A., Riedinger, L. L., Aguilar, A., Carpenter, M. P., Chiara, C. J., Chowdhury, P., Darby, I., Garg, U., Ijaz, Q., Janssens, R. V. F., Kondev, F. G., Lakshmi, S., Lauritsen, T., Ma, W. C., McCutchan, E. A., Mukhopadhyay, S., Seyfried, E. P., Stefanescu, I., Tandel, S. K., Tandel, U. S., Teal, C., Vanhoy, J. R., and Zhu, S.

Subjects
Nuclear Experiment
Abstract

High-spin states in the odd-odd nucleus $^{168}$Ta have been populated in the $^{120}$Sn($^{51}$V,3n) reaction. Two multi-quasiparticle structures have been extended significantly from spin $\sim{20\hbar}$ to above ${40\hbar}$. As a result, the first rotational alignment has been fully delineated and a second band crossing has been observed for the first time in this nucleus. Configurations for these strongly-coupled rotational bands are proposed based on signature splitting, $B(M1)/B(E2)$ ratio information, and observed rotation-alignment behavior. Properties of the observed bands in $^{168}$Ta are compared to related structures in the neighboring odd-$Z$, odd-$N$, and odd-odd nuclei and are discussed within the framework of the cranked shell model., Comment: 9 pages, 9 figures, Gammasphere experiment

Published
2010
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14. Decay modes of 250No

Author

Peterson, D., Back, B. B., Janssens, R. V. F., Khoo, T. L., Lister, C. J., Seweryniak, D., Ahmad, I., Carpenter, M. P., Davids, C. N., Hecht, A. A., Jiang, C. L., Lauritsen, T., Wang, X., Zhu, S., Kondev, F. G., Heinz, A., Qian, J., Winkler, R., Chowdhury, P., Tandel, S. K., and Tandel, U. S.

Subjects
Nuclear Experiment
Abstract

The Fragment Mass Analyzer at the ATLAS facility has been used to unambiguously identify the mass number associated with different decay modes of the nobelium isotopes produced via 204Pb(48Ca,xn)(252-x)No reactions. Isotopically pure (>99.7%) 204Pb targets were used to reduce background from more favored reactions on heavier lead isotopes. Two spontaneous fission half-lives (t_1/2 = 3.7+1.1-0.8 us and 43+22-15 us) were deduced from a total of 158 fission events. Both decays originate from 250No rather than from neighboring isotopes as previously suggested. The longer activity most likely corresponds to a K-isomer in this nucleus. No conclusive evidence for an alpha branch was observed, resulting in upper limits of 2.1% for the shorter lifetime and 3.4% for the longer activity., Comment: RevTex4, 10 pages, 5 figures, submitted to PRC

Published
2006
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19. Shapes, softness, and nonyrast collectivity in W186

Author

Prasher, V. S., primary, Mitchell, A. J., additional, Lister, C. J., additional, Chowdhury, P., additional, Afanasieva, L., additional, Albers, M., additional, Chiara, C. J., additional, Carpenter, M. P., additional, Cline, D., additional, D'Olympia, N., additional, Guess, C. J., additional, Hayes, A. B., additional, Hoffman, C. R., additional, Janssens, R. V. F., additional, Kay, B. P., additional, Khoo, T. L., additional, Korichi, A., additional, Lauritsen, T., additional, Merchan, E., additional, Qiu, Y., additional, Seweryniak, D., additional, Shearman, R., additional, Tandel, S. K., additional, Verras, A., additional, Wu, C. Y., additional, and Zhu, S., additional

Published
2021
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21. Nanosecond isomers and the evolution of collectivity in stable, even- A Hg isotopes

Author

Suman, Saket, primary, Tandel, S. K., additional, Kumawat, Ankit, additional, Wahid, S. G., additional, Hemalatha, M., additional, Chowdhury, P., additional, Janssens, R. V. F., additional, Carpenter, M. P., additional, Khoo, T. L., additional, Kondev, F. G., additional, Lauritsen, T., additional, Lister, C. J., additional, Seweryniak, D., additional, and Zhu, S., additional

Published
2021
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22. Decay spectroscopy of two-quasiparticle K isomers in Cm246,248 via inelastic and transfer reactions

Author

Shirwadkar, U., primary, Tandel, S. K., additional, Chowdhury, P., additional, Khoo, T. L., additional, Ahmad, I., additional, Carpenter, M. P., additional, Greene, J. P., additional, Janssens, R. V. F., additional, Kondev, F. G., additional, Lauritsen, T., additional, Lister, C. J., additional, Peterson, D., additional, Seweryniak, D., additional, Wang, X., additional, and Zhu, S., additional

Published
2019
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23. Isomers from intrinsic excitations in Tl200 and Pb201,202

Author

Roy, Poulomi, primary, Tandel, S. K., additional, Suman, Saket, additional, Chowdhury, P., additional, Janssens, R. V. F., additional, Carpenter, M. P., additional, Khoo, T. L., additional, Kondev, F. G., additional, Lauritsen, T., additional, Lister, C. J., additional, Seweryniak, D., additional, and Zhu, S., additional

Published
2019
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24. Structure of odd- A Pt isotopes along the line of stability

Author

Wahid, S. G., primary, Tandel, S. K., additional, Chowdhury, P., additional, Janssens, R. V. F., additional, Carpenter, M. P., additional, Khoo, T. L., additional, Kondev, F. G., additional, Lauritsen, T., additional, Lister, C. J., additional, Seweryniak, D., additional, Zhu, S., additional, Chen, Q. B., additional, and Meng, J., additional

Published
2019
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25. Decoupled and semi-decoupled bands in Hg197 and Hg199

Author

Negi, D., primary, Tandel, S. K., additional, Chauhan, P., additional, Chowdhury, P., additional, Janssens, R. V. F., additional, Carpenter, M. P., additional, Khoo, T. L., additional, Kondev, F. G., additional, Lauritsen, T., additional, Lister, C. J., additional, Seweryniak, D., additional, and Zhu, S., additional

Published
2019
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27. Publisher's Note: Semi-decoupled band and other high-spin band structures in Pt188 [Phys. Rev. C 96 , 014315 (2017)]

Author

Mukhopadhyay, S., primary, Biswas, D. C., additional, Tandel, S. K., additional, Frauendorf, S., additional, Danu, L. S., additional, Prashanth, P. N., additional, Joshi, B. N., additional, Prajapati, G. K., additional, John, B. V., additional, Nag, Somnath, additional, Trivedi, T., additional, Saha, S., additional, Sethi, J., additional, Palit, R., additional, and Joshi, P. K., additional

Published
2017
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28. Semi-decoupled band and other high-spin band structures in Pt188

Author

Mukhopadhyay, S., primary, Biswas, D. C., additional, Tandel, S. K., additional, Frauendorf, S., additional, Danu, L. S., additional, Prashanth, P. N., additional, Joshi, B. N., additional, Prajapati, G. K., additional, John, B. V., additional, Nag, Somnath, additional, Trivedi, T., additional, Saha, S., additional, Sethi, J., additional, Palit, R., additional, and Joshi, P. K., additional

Published
2017
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29. Transverse wobbling in ^{135}pr

Author

Matta, J. T., Garg, U., Li, W., Frauendorf, S., Ayangeakaa, A. D., Patel, D., Schlax, K. W., Palit, R., Saha, S., Sethi, J., Trivedi, T., Ghugre, S. S., Raut, R., Sinha, A. K., Janssens, R. V. F., Zhu, S., Carpenter, M. P., Lauritsen, T., Seweryniak, D., Chiara, C. J., Kondev, F. G., Hartley, D. J., Petrache, C. M., Mukhopadhyay, S., Lakshmi, D. Vijaya, Raju, M. Kumar, Rao, P. V. Madhusudhana, Tandel, S. K., Ray, S., and Dönau, F.

Subjects
Nuclear Theory (nucl-th), Quantitative Biology::Biomolecules, Nuclear Theory, FOS: Physical sciences, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics::Geophysics
Abstract

A pair of transverse wobbling bands has been observed in the nucleus $^{135}$Pr. The wobbling is characterized by $\Delta I$ =1, E2 transitions between the bands, and a decrease in the wobbling energy confirms its transverse nature. Additionally, a transition from transverse wobbling to a three-quasiparticle band comprised of strong magnetic dipole transitions is observed. These observations conform well to results from calculations with the Tilted Axis Cranking (TAC) model and the Quasiparticle Triaxial Rotor (QTR) Model., Comment: 6 pages; 5 figures; accepted for publication in the Physical Review Letters

Published
2014

30. Configurations and decay hindrances of high- K states in Hf180

Author

Tandel, S. K., primary, Chowdhury, P., additional, Kondev, F. G., additional, Janssens, R. V. F., additional, Khoo, T. L., additional, Carpenter, M. P., additional, Lauritsen, T., additional, Lister, C. J., additional, Seweryniak, D., additional, Zhu, S., additional, Deacon, A., additional, Freeman, S. J., additional, Hammond, N. J., additional, Jones, G. D., additional, Moore, E. F., additional, and Smith, J. F., additional

Published
2016
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31. Population and decay of aKπ=8−two-quasineutron isomer inPu244

Author

Hota, S. S., primary, Tandel, S. K., additional, Chowdhury, P., additional, Ahmad, I., additional, Carpenter, M. P., additional, Chiara, C. J., additional, Greene, J. P., additional, Hoffman, C. R., additional, Jackson, E. G., additional, Janssens, R. V. F., additional, Kay, B. P., additional, Khoo, T. L., additional, Kondev, F. G., additional, Lakshmi, S., additional, Lalkovski, S., additional, Lauritsen, T., additional, Lister, C. J., additional, McCutchan, E. A., additional, Moran, K., additional, Peterson, D., additional, Shirwadkar, U., additional, Seweryniak, D., additional, Stefanescu, I., additional, Toh, Y., additional, and Zhu, S., additional

Published
2016
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32. Structure ofTe8052132: The two-particle and two-hole spectrum ofSn8250132

Author

Biswas, S., primary, Palit, R., additional, Navin, A., additional, Rejmund, M., additional, Bisoi, A., additional, Sarkar, M. Saha, additional, Sarkar, S., additional, Bhattacharyya, S., additional, Biswas, D. C., additional, Caamaño, M., additional, Carpenter, M. P., additional, Choudhury, D., additional, Clément, E., additional, Danu, L. S., additional, Delaune, O., additional, Farget, F., additional, de France, G., additional, Hota, S. S., additional, Jacquot, B., additional, Lemasson, A., additional, Mukhopadhyay, S., additional, Nanal, V., additional, Pillay, R. G., additional, Saha, S., additional, Sethi, J., additional, Singh, Purnima, additional, Srivastava, P. C., additional, and Tandel, S. K., additional

Published
2016
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34. High spin spectroscopy and shape coexistence inAs73

Author

Raju, M. Kumar, primary, Rao, P. V. Madhusudhana, additional, Tandel, S. K., additional, Sugathan, P., additional, Singh, R. P., additional, Muralithar, S., additional, Reddy, T. Seshi, additional, Rao, B. V. Thirumala, additional, Meng, Jie, additional, Zhang, Shuangquan, additional, Li, Jian, additional, Chen, Q. B., additional, Qi, Bin, additional, and Bhowmik, R. K., additional

Published
2015
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35. Rotation-aligned isomer and oblate collectivity inPt196

Author

Wahid, S. G., primary, Tandel, S. K., additional, Chowdhury, P., additional, Janssens, R. V. F., additional, Carpenter, M. P., additional, Khoo, T. L., additional, Kondev, F. G., additional, Lauritsen, T., additional, Lister, C. J., additional, Seweryniak, D., additional, and Zhu, S., additional

Published
2015
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36. Transverse Wobbling inPr135

Author

Matta, J. T., primary, Garg, U., additional, Li, W., additional, Frauendorf, S., additional, Ayangeakaa, A. D., additional, Patel, D., additional, Schlax, K. W., additional, Palit, R., additional, Saha, S., additional, Sethi, J., additional, Trivedi, T., additional, Ghugre, S. S., additional, Raut, R., additional, Sinha, A. K., additional, Janssens, R. V. F., additional, Zhu, S., additional, Carpenter, M. P., additional, Lauritsen, T., additional, Seweryniak, D., additional, Chiara, C. J., additional, Kondev, F. G., additional, Hartley, D. J., additional, Petrache, C. M., additional, Mukhopadhyay, S., additional, Lakshmi, D. Vijaya, additional, Raju, M. Kumar, additional, Madhusudhana Rao, P. V., additional, Tandel, S. K., additional, Ray, S., additional, and Dönau, F., additional

Published
2015
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37. Collective rotation and vibration in neutron-rich 180,182Hf nuclei

Author

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 Cullen, D. M.

Published
2007

38. Collective Rotation and Vibration in Neutron-Rich Hf-180,Hf-182 Nuclei

Author

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

39. Role of neutrons in the coexistence of magnetic and antimagnetic rotation bands inCd107

Author

Choudhury, Deepika, primary, Palit, R., additional, Singh, P., additional, Sethi, J., additional, Saha, S., additional, Biswas, S., additional, Jain, H. C., additional, Nanal, V., additional, Pillay, R. G., additional, Donthi, R., additional, Jadhav, S. K., additional, Naidu, B. S., additional, Maheshwari, B., additional, Jain, A. K., additional, Pancholi, S. C., additional, Singh, R. P., additional, Mukhopadhyay, S., additional, Biswas, D. C., additional, Danu, L. S., additional, Tandel, S. K., additional, Chaturvedi, L., additional, Rojeeta Devi, K., additional, and Singh, Sukhjeet, additional

Published
2015
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40. Isomers and oblate collectivity at high spin in neutron-rich Pt isotopes.

Author

Tandel, S. K.

Subjects
*NUCLEAR isomers, *NEUTRON spin, *PARTICLE interactions, *NUCLEAR reactions, *NUCLEAR physics
Abstract

Isomers and high-spin structures with rotation-aligned oblate configurations have been studied in several Pt isotopes. The 12+ states in the even Pt isotopes from 192-198Pt are found to be metastable, and have (i13/2)2 neutron character. The progression of E2 transition probabilities from the 12+ to 10+ states across the Pt isotopic chain implies reduction in collectivity, followed by an abrupt decrease at N=120 (198Pt). This behavior is quite distinct from the gradual decrease of B(E2) values near the respective ground states. A large contribution from aligned angular momentum, to the rotational sequences built on the 12+ states, is visible. This is due to the relatively small crossing frequencies for nucleons in low-Ω orbitals at oblate deformation in comparison to higher values for prolate shapes. As a result, oblate rotation is found to be increasingly favored for higher neutron numbers. [ABSTRACT FROM AUTHOR]

Published
2016
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42. Evolution of octupole collectivity in221Th

Author

Tandel, S. K., primary, Hemalatha, M., additional, Deo, A. Y., additional, Patel, S. B., additional, Palit, R., additional, Trivedi, T., additional, Sethi, J., additional, Saha, S., additional, Biswas, D. C., additional, and Mukhopadhyay, S., additional

Published
2013
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43. Studies of multi-quasiparticle K-isomers in rare-earth and trans-fermium nuclei

Author

Kondev, Filip G, Dracoulis, George, Khoo, T, Lane, Gregory, Byrne, Aidan, Kibedi, Tibor, Ahmad, I., Back, B., Carpenter, M P, Janssens, R V F, Lauritsen, T, Lister, C J, Peterson, D., Seweryniak, D, Zhu, S., Chowdhury, P, Tandel, S K, Kondev, Filip G, Dracoulis, George, Khoo, T, Lane, Gregory, Byrne, Aidan, Kibedi, Tibor, Ahmad, I., Back, B., Carpenter, M P, Janssens, R V F, Lauritsen, T, Lister, C J, Peterson, D., Seweryniak, D, Zhu, S., Chowdhury, P, and Tandel, S K

Published
2007

44. Multiple band structures in 169Ta

Author

Hartley, D. J., Mohr, W. H., Vanhoy, J. R., Riley, M. A., Aguilar, A., Teal, C., Janssens, R. V. F., Carpenter, M. P., Hecht, A. A., Lauritsen, T., Moore, E. F., Zhu, S., Kondev, F. G., Djongolov, M. K., Danchev, M., Riedinger, L. L., Hagemann, Gudrun Bertram, Sletten, G., Chowdhury, P., Tandel, S. K., Ma, W. C., Ødegård, S. W., Hartley, D. J., Mohr, W. H., Vanhoy, J. R., Riley, M. A., Aguilar, A., Teal, C., Janssens, R. V. F., Carpenter, M. P., Hecht, A. A., Lauritsen, T., Moore, E. F., Zhu, S., Kondev, F. G., Djongolov, M. K., Danchev, M., Riedinger, L. L., Hagemann, Gudrun Bertram, Sletten, G., Chowdhury, P., Tandel, S. K., Ma, W. C., and Ødegård, S. W.

Abstract

Nuclei, physics, rare-earth nuclei Udgivelsesdato: 28 Nov.

Published
2006

45. Beyond Band Termination in 157 Er and the Search for Wobbling Excitations in Strongly Deformed 174 Hf

Author

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

46. Structure of Multi-Quasiparticle Isomers in the Region of 177 Lu

Author

Dracoulis, George, Kondev, Filip G, Lane, Gregory, Byrne, Aidan, Kibedi, Tibor, Ahmad, I., Carpenter, M P, Freeman, S J, Janssens, R V F, Hammond, N.J., Lauritsen, T, Lister, C J, Seweryniak, D, Mukherjee, G, Chowdhury, P, Tandel, S K, Dracoulis, George, Kondev, Filip G, Lane, Gregory, Byrne, Aidan, Kibedi, Tibor, Ahmad, I., Carpenter, M P, Freeman, S J, Janssens, R V F, Hammond, N.J., Lauritsen, T, Lister, C J, Seweryniak, D, Mukherjee, G, Chowdhury, P, and Tandel, S K

Published
2005

47. Wobbling Excitations in Strongly Deformed Hf Nuclei?

Author

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

48. Search for Wobbling Excitations in Hf Nuclei: Are the SD Bands Triaxial?

Author

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

49. Rotational structures and the wobbling mode inTa167

Author

Hartley, D. J., primary, Janssens, R. V. F., additional, Riedinger, L. L., additional, Riley, M. A., additional, Wang, X., additional, Aguilar, A., additional, Carpenter, M. P., additional, Chiara, C. J., additional, Chowdhury, P., additional, Darby, I. G., additional, Garg, U., additional, Ijaz, Q. A., additional, Kondev, F. G., additional, Lakshmi, S., additional, Lauritsen, T., additional, Ludington, A., additional, Ma, W. C., additional, McCutchan, E. A., additional, Mukhopadhyay, S., additional, Pifer, R., additional, Seyfried, E. P., additional, Shirwadkar, U., additional, Stefanescu, I., additional, Tandel, S. K., additional, Vanhoy, J. R., additional, Zhu, S., additional, and Frauendorf, S., additional

Published
2011
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50. Search for a 2-quasiparticle high-Kisomer inRf256

Author

Robinson, A. P., primary, Khoo, T. L., additional, Seweryniak, D., additional, Ahmad, I., additional, Asai, M., additional, Back, B. B., additional, Carpenter, M. P., additional, Chowdhury, P., additional, Davids, C. N., additional, Greene, J., additional, Greenlees, P. T., additional, Hauschild, K., additional, Heinz, A., additional, Herzberg, R.-D., additional, Janssens, R. V. F., additional, Jenkins, D. G., additional, Jones, G. D., additional, Ketelhut, S., additional, Kondev, F. G., additional, Lauritsen, T., additional, Lister, C. J., additional, Lopez-Martens, A., additional, Marley, P., additional, McCutchan, E., additional, Papadakis, P., additional, Peterson, D., additional, Qian, J., additional, Rostron, D., additional, Shirwadkar, U., additional, Stefanescu, I., additional, Tandel, S. K., additional, Wang, X., additional, and Zhu, S., additional

Published
2011
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