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27 results on '"Choudry, S. N."'

1. Search for Intrinsic Excitations in 152Sm

Author

Kulp, W. D., Wood, J. L., Garrett, P. E., Wu, C. Y., Cline, D., Allmond, J. M., Bandyopadhyay, D., Dashdorj, D., Choudry, S. N., Hayes, A. B., Hua, H., Mynk, M. G., McEllistrem, M. T., McKay, C. J., Orce, J. N., Teng, R., and Yates, S. W.

Subjects
Nuclear Experiment
Abstract

The 685 keV excitation energy of the first excited 0+ state in 152Sm makes it an attractive candidate to explore expected two-phonon excitations at low energy. Multiple-step Coulomb excitation and inelastic neutron scattering studies of 152Sm are used to probe the E2 collectivity of excited 0+ states in this "soft" nucleus and the results are compared with model predictions. No candidates for two-phonon K=0+ quadrupole vibrational states are found. A 2+, K=2 state with strong E2 decay to the first excited K=0+ band and a probable 3+ band member are established., Comment: 4 pages, 6 figures, accepted for publication as a Rapid Communication in Physical Review C

Published
2008
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2. Shape Coexistence and Mixing in 152Sm

Author

Kulp, W. D., Wood, J. L., Garrett, P. E., Wu, C. Y., Cline, D., Allmond, J. M., Bandyopadhyay, D., Dashdorj, D., Choudry, S. N., Hayes, A. B., Hua, H., Lesher, S. R., Mynk, M., McEllistrem, M. T., McKay, C. J., Orce, J. N., Teng, R., and Yates, S. W.

Subjects
Nuclear Experiment
Abstract

Experimental studies of 152Sm using multiple-step Coulomb excitation and inelastic neutron scattering provide key data that clarify the low-energy collective structure of this nucleus. No candidates for two-phonon beta-vibrational states are found. Experimental level energies of the ground-state and first excited (0+ state) rotational bands, electric monopole transition rates, reduced quadrupole transition rates, and the isomer shift of the first excited 2+ state are all described within ~10% precision using two-band mixing calculations. The basic collective structure of 152Sm is described using strong mixing of near-degenerate coexisting quasi-rotational bands with different deformations., Comment: 8 single-spaced, single-column pages, 4 figures, 1 table. Submitted to Physical Review Letters

Published
2007

4. Collective quadrupole behavior in Pd106

Author

Prados-Estévez, F. M., primary, Peters, E. E., additional, Chakraborty, A., additional, Mynk, M. G., additional, Bandyopadhyay, D., additional, Boukharouba, N., additional, Choudry, S. N., additional, Crider, B. P., additional, Garrett, P. E., additional, Hicks, S. F., additional, Kumar, A., additional, Lesher, S. R., additional, McKay, C. J., additional, McEllistrem, M. T., additional, Mukhopadhyay, S., additional, Orce, J. N., additional, Scheck, M., additional, Vanhoy, J. R., additional, Wood, J. L., additional, and Yates, S. W., additional

Published
2017
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6. Erratum: Experimental study of the low-lying structure of94Zr with the(n,n′γ)reaction [Phys. Rev. C78, 064303 (2008)]

Author

Elhami, E., primary, Orce, J. N., additional, Scheck, M., additional, Mukhopadhyay, S., additional, Choudry, S. N., additional, McEllistrem, M. T., additional, Yates, S. W., additional, Angell, C., additional, Boswell, M., additional, Fallin, B., additional, Howell, C. R., additional, Hutcheson, A., additional, Karwowski, H. J., additional, Kelley, J. H., additional, Parpottas, Y., additional, Tonchev, A. P., additional, and Tornow, W., additional

Published
2013
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8. TRANSITION RATES OF DECAYS FROM COLLECTIVE STATES IN 150Nd

Author

CHAKRABORTY, A., primary, PRADOS-ESTÉVEZ, F. M., additional, CHOUDRY, S. N., additional, CRIDER, B. P., additional, KUMAR, A., additional, MCELLISTREM, M. T., additional, MUKHOPADHYAY, S., additional, MYNK, M. G., additional, PETERS, E. E., additional, WOOD, J. L., additional, YATES, S. W., additional, GARRETT, P. E., additional, KULP, W. D., additional, and ORCE, J. N., additional

Published
2013
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9. New decay pattern of negative-parity states atN=90

Author

Chakraborty, A., primary, Prados-Estévez, F. M., additional, Choudry, S. N., additional, Crider, B. P., additional, Garrett, P. E., additional, Kulp, W. D., additional, Kumar, A., additional, McEllistrem, M. T., additional, Mukhopadhyay, S., additional, Mynk, M. G., additional, Orce, J. N., additional, Peters, E. E., additional, Wood, J. L., additional, and Yates, S. W., additional

Published
2012
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10. Investigation of [sup 152]Sm by Complementary Reactions

Author

Garrett, P. E., primary, Kulp, W. D., additional, Wood, J. L., additional, Allmond, J. M., additional, Bandyopadhyay, D., additional, Christen, S., additional, Choudry, S. N., additional, Cline, D., additional, Dashdorj, D., additional, Dewald, A., additional, Fitzler, A., additional, Fransen, C., additional, Hayes, A. B., additional, Hua, H., additional, Jessen, K., additional, Jolie, J., additional, Kloezer, A., additional, Kudejova, P., additional, Kumar, A., additional, Lesher, S. R., additional, Linnemann, A., additional, Lisetskiy, A., additional, Martin, D., additional, Masur, M., additional, McEllistrem, M. T., additional, Möller, O., additional, Mynk, M. G., additional, McKay, C. J., additional, Orce, J. N., additional, Pejovic, P., additional, Pissulla, T., additional, Regis, J.-M., additional, Schiller, A., additional, Teng, R., additional, Tonev, D., additional, Wu, C. Y., additional, Yates, S. W., additional, Jolie, Jan, additional, Zilges, Andreas, additional, Warr, Nigel, additional, and Blazhev, Andrey, additional

Published
2009
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11. Low-lying Collective States in [sup 136]Ba

Author

Scheck, M., primary, Mukhopadhyay, S., additional, Crider, B., additional, Choudry, S. N., additional, Elhami, E., additional, Peters, E. E., additional, McEllistrem, M. T., additional, Orce, J. N., additional, Yates, S. W., additional, Jolie, Jan, additional, Zilges, Andreas, additional, Warr, Nigel, additional, and Blazhev, Andrey, additional

Published
2009
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12. Experimental study of the low-lying structure ofZr94with the(n,n'γ)reaction

Author

Elhami, E., primary, Orce, J. N., additional, Scheck, M., additional, Mukhopadhyay, S., additional, Choudry, S. N., additional, McEllistrem, M. T., additional, Yates, S. W., additional, Angell, C., additional, Boswell, M., additional, Fallin, B., additional, Howell, C. R., additional, Hutcheson, A., additional, Karwowski, H. J., additional, Kelley, J. H., additional, Parpottas, Y., additional, Tonchev, A. P., additional, and Tornow, W., additional

Published
2008
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13. Multiphonon states in56136Ba80

Author

Mukhopadhyay, S., primary, Scheck, M., additional, Crider, B., additional, Choudry, S. N., additional, Elhami, E., additional, Peters, E., additional, McEllistrem, M. T., additional, Orce, J. N., additional, and Yates, S. W., additional

Published
2008
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16. Search for intrinsic collective excitations inSm152

Author

Kulp, W. D., primary, Wood, J. L., additional, Garrett, P. E., additional, Wu, C. Y., additional, Cline, D., additional, Allmond, J. M., additional, Bandyopadhyay, D., additional, Dashdorj, D., additional, Choudry, S. N., additional, Hayes, A. B., additional, Hua, H., additional, Mynk, M. G., additional, McEllistrem, M. T., additional, McKay, C. J., additional, Orce, J. N., additional, Teng, R., additional, and Yates, S. W., additional

Published
2008
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18. 21+→01+transition strengths in Sn nuclei

Author

Orce, J. N., primary, Choudry, S. N., additional, Crider, B., additional, Elhami, E., additional, Mukhopadhyay, S., additional, Scheck, M., additional, McEllistrem, M. T., additional, and Yates, S. W., additional

Published
2007
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20. Test of isospin purity in theA=42isobaric analogs

Author

Orce, J. N., primary, Petkov, P., additional, McKay, C. J., additional, Choudry, S. N., additional, Lesher, S. R., additional, Mynk, M., additional, Bandyopadhyay, D., additional, Yates, S. W., additional, and McEllistrem, M. T., additional

Published
2004
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21. TRANSITION RATES OF DECAYS FROM COLLECTIVE STATES IN 150Nd.

Author

CHAKRABORTY, A., PRADOS-ESTÉVEZ, F. M., CHOUDRY, S. N., CRIDER, B. P., KUMAR, A., MCELLISTREM, M. T., MUKHOPADHYAY, S., MYNK, M. G., PETERS, E. E., WOOD, J. L., YATES, S. W., GARRETT, P. E., KULP, W. D., and ORCE, J. N.

Subjects
NEODYMIUM isotopes, NUCLEAR structure, NUCLEAR energy levels, COLLECTIVE excitations, NUCLEAR spin, X-ray spectroscopy
Published
2013

22. Low-lying Collective States in 136Ba.

Author

Scheck, M., Mukhopadhyay, S., Crider, B., Choudry, S. N., Elhami, E., Peters, E. E., McEllistrem, M. T., Orce, J. N., and Yates, S. W.

Subjects
BARIUM, DOPPLER effect, NUCLEAR structure, NEUTRON scattering, PHONONS, NUCLEAR physics
Abstract

Low-lying collective states in 136Ba were investigated with (n,n′γ) techniques, including Doppler-shift attenuation lifetime measurements. The level spins, lifetimes, branching ratios, multipole-mixing ratios and transition strengths reveal candidates for symmetric-phonon states up to third order. The 2ms+ mixed-symmetry state was confirmed as unfragmented and a candidate for a [21+x2ms+]3+ two-phonon mixed-symmetry state is proposed. [ABSTRACT FROM AUTHOR]

Published
2009
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23. Investigation of 152Sm by Complementary Reactions.

Author

Garrett, P. E., Kulp, W. D., Wood, J. L., Allmond, J. M., Bandyopadhyay, D., Christen, S., Choudry, S. N., Cline, D., Dashdorj, D., Dewald, A., Fitzler, A., Fransen, C., Hayes, A. B., Hua, H., Jessen, K., Jolie, J., Kloezer, A., Kudejova, P., Kumar, A., and Lesher, S. R.

Subjects
NUCLEAR structure, ISOTOPES, PHASE transitions, COULOMB excitation, PHONONS, NUCLEAR isomers
Abstract

Understanding the nuclear structure of 152Sm, along with other N = 90 isotones, has long posed a challenge. A rapid transition in shape between the spherical N = 88 150Sm and well-deformed N = 92 154Sm is observed, along with strong evidence for shape coexistence. Competing ideas have been put forward over the decades, with the most recent being that N = 90 is at the critical point of a shape phase transition. Until recently, the lack of high-precision data has not allowed the competing models to be extensively tested. In a coordinated program of investigation, a series of complementary experiments, which include high-statistics β decay, multi-step Coulomb excitation, the 150Nd(α,2n) reaction, and the (n,n′γ) reaction, have been performed for 152Sm. These experiments have revealed the existence of a pairing-isomer band, a hexadecapole band, the lack of multi-phonon β vibrational bands, and the repetition of structures built on the first excited Kπ = 0+ as built on the ground state. The status of these coordinated studies is examined. [ABSTRACT FROM AUTHOR]

Published
2009
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24. Symmetry and structure tests in 18O and 18Ne.

Author

Choudry, S. N., Orce, J. N., Varadarajan, V., Lesher, S., Bandyopadhyay, D., Mukhopadhyay, S., Yates, S. W., and McEllistrem, M. T.

Subjects
*ISOBARIC spin, *NUCLEAR physics, *NUCLEAR structure, *NUCLIDES, *NEUTRONS
Abstract

Isospin (T) symmetry assumes charge symmetry and charge independence are explicit in nuclear structure. Whereas charge independence implies the nn, np and pp interactions are the same, charge symmetry states that the nn and pp interactions are equal. The latt_er approximate symmetry is experimentally verified by the comparison of the excited levels lying at about the same energy in light mirror nuclei. Both of these symmetries are broken by the electromagnetic interaction. The neutron facility at the University of Kentucky provides a unique opportunity to examine charge independence, and in particular, charge symmetry from the reduced electromagnetic transition probabilities and neutron scattering cross sections. Here, we use the isospin formalism by Bernstein, Brown and Madsen, which relates the proton and neutron matrix elements, M p and M n respectively, for equivalent excited states in T=1 mirror nuclei (Tz = +/-1). The nucleus 18O has been studied using the (n,n′) reaction in order to measure the neutron cross sections of the 2+1, T=1 state. Using the previously determined proton matrix elements for the Tz = -1 mirror nucleus (18Ne), along with the determination of the neutron matrix element in 18O from neutron scattering, allows an experimental test of charge symmetry in the A=18 mirror system. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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25. Search for Multiphonon and Mixed-Symmetry States in 127I.

Author

Mukhopadhyay, S., Orce, J. N., Choudry, S. N., Varadarajan, V., Kumar, A., McEllistrem, M. T., and Yates, S. W.

Subjects
PHONONS, QUASIPARTICLES, IODINE, IODINE isotopes, NUCLEAR physics
Abstract

The low-spin structure of 127I has been studied using the (n,n′γ) reaction at neutron energies ranging from 1.2 to 2.3 MeV and the (n,n′γγ) reaction at 3 MeV. New excited levels and γ-rays have been identified by using excitation functions and coincidence data. Lifetimes were also determined from an angular distribution experiment. Future work involves determining multipolarities and spin assignments in order to obtain B(M1) and B(E2) values. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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26. Isospin purity in the A=42 isobars.

Author

Orce, J. N., Petkov, P., McKay, C. J., Choudry, S. N., Lesher, S. L., Mynk, M., Bandyopadhyay, D., Yates, S. W., and McEllistrem, M. T.

Subjects
ISOBARIC spin, NUCLEAR physics, QUANTUM theory, NUCLEAR isobars, ISOTOPES, NUCLIDES
Abstract

The lifetime of the first 2T=1+ state in 42Sc has been measured as 74(16) fs. This result gives a value for the isoscalar matrix element of M0=6.63(76). From the mirror nuclei, 42Ca and TTi, the isoscalar matrix element is given as 7.15(48) W.u., confirming isospin purity in the A=42 isobars. [ABSTRACT FROM AUTHOR]

Published
2004
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27. Collective quadrupole behavior in 106Pd.

Author

Prados-Estévez, F. M., Peters, E. E., Chakraborty, A., Mynk, M. G., Bandyopadhyay, D., Boukharouba, N., Choudry, S. N., Crider, B. P., Garrett, P. E., Hicks, S. F., Kumar, A., Lesher, S. R., McKay, C. J., McEllistrem, M. T., Mukhopadhyay, S., Orce, J. N., Scheck, M., Vanhoy, J. R., Wood, J. L., and Yates, S. W.

Subjects
*LEAD, *QUADRUPOLES
Abstract

Excited states in 106Pd were studied with the (n,n'γ) reaction, and comprehensive information for excitations with spin ≤6ℏ was obtained. The data include level lifetimes in the femtosecond regime, spins and parities, transition multipolarities, and multipole mixing ratios, which allow the determination of reduced transition probabilities. The E2 decay strength to the low-lying states is mapped up to ≈2.4 MeV in excitation energy. The structures associated with quadrupole collectivity are elucidated and organized into bands. [ABSTRACT FROM AUTHOR]

Published
2017
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