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4 results on '"Nara Singh, B.S."'

1. Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive Ra 222 and Ra 228 Beams

Author

Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), National Science Centre (Poland), European Commission, Research Foundation - Flanders, Belgian Science Policy Office, University of Leuven, Russian Foundation for Basic Research, Academy of Finland, Butler, P.A., Gaffney, L.P., Spagnoletti, P., Abrahams, K., Bowry, M., Cederkäll, J., Angelis, G. de, Witte, H. de, Garrett, P.E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D.T., Keatings, J.M., Kelly, N.A., Komorowska, M., Konki, J., Kröll, T., Lozano, M., Nara Singh, B.S., O'Donnell, D., Ojala, J., Page, R.D., Pedersen, L.G., Raison, C., Reiter, P., Rodríguez, J. A., Rosiak, D., Rothe, S., Scheck, M., Seidlitz, M., Shneidman, T.M., Siebeck, B., Sinclair, J., Smith, J. F., Stryjczyk, M., Van Duppen, P., Víñals, S., Virtanen, V., Warr, N., Wrzosek-Lipska, K., Zielinska, M., Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), National Science Centre (Poland), European Commission, Research Foundation - Flanders, Belgian Science Policy Office, University of Leuven, Russian Foundation for Basic Research, Academy of Finland, Butler, P.A., Gaffney, L.P., Spagnoletti, P., Abrahams, K., Bowry, M., Cederkäll, J., Angelis, G. de, Witte, H. de, Garrett, P.E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D.T., Keatings, J.M., Kelly, N.A., Komorowska, M., Konki, J., Kröll, T., Lozano, M., Nara Singh, B.S., O'Donnell, D., Ojala, J., Page, R.D., Pedersen, L.G., Raison, C., Reiter, P., Rodríguez, J. A., Rosiak, D., Rothe, S., Scheck, M., Seidlitz, M., Shneidman, T.M., Siebeck, B., Sinclair, J., Smith, J. F., Stryjczyk, M., Van Duppen, P., Víñals, S., Virtanen, V., Warr, N., Wrzosek-Lipska, K., and Zielinska, M.

Abstract

There is sparse direct experimental evidence that atomic nuclei can exhibit stable "pear" shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole (E3) matrix elements have been determined for transitions in Ra222,228 nuclei using the method of sub-barrier, multistep Coulomb excitation. Beams of the radioactive radium isotopes were provided by the HIE-ISOLDE facility at CERN. The observed pattern of E3 matrix elements for different nuclear transitions is explained by describing Ra222 as pear shaped with stable octupole deformation, while Ra228 behaves like an octupole vibrator.

Published
2020

2. The observation of vibrating pear-shapes in radon nuclei

Author

Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), National Science Centre (Poland), European Commission, Research Foundation - Flanders, Belgian Science Policy Office, Russian Foundation for Basic Research, SCOAP, Butler, P.A., Gaffney, L.P., Spagnoletti, P., Konki, J., Scheck, M., Smith, J. F., Abrahams, K., Bowry, M., Cederkäll, J., Chupp, T., De Angelis, G., De Witte, H., Garrett, P.E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D.T., Keatings, J.M., Kelly, N.A., Komorowska, M., Kröll, T., Lozano, M., Nara Singh, B.S., O¿Donnell, D., Ojala, J., Page, R.D., Pedersen, L.G., Raison, C., Reiter, P., Rodríguez, J. A., Rosiak, D., Rothe, S., Shneidman, T.M., Siebeck, B., Seidlitz, M., Sinclair, J., Stryjczyk, M., Van Duppen, P., Viñals, S., Virtanen, V., Warr, N., Wrzosek-Lipska, K., Zielinska, M., Science and Technology Facilities Council (UK), Federal Ministry of Education and Research (Germany), National Science Centre (Poland), European Commission, Research Foundation - Flanders, Belgian Science Policy Office, Russian Foundation for Basic Research, SCOAP, Butler, P.A., Gaffney, L.P., Spagnoletti, P., Konki, J., Scheck, M., Smith, J. F., Abrahams, K., Bowry, M., Cederkäll, J., Chupp, T., De Angelis, G., De Witte, H., Garrett, P.E., Goldkuhle, A., Henrich, C., Illana, A., Johnston, K., Joss, D.T., Keatings, J.M., Kelly, N.A., Komorowska, M., Kröll, T., Lozano, M., Nara Singh, B.S., O¿Donnell, D., Ojala, J., Page, R.D., Pedersen, L.G., Raison, C., Reiter, P., Rodríguez, J. A., Rosiak, D., Rothe, S., Shneidman, T.M., Siebeck, B., Seidlitz, M., Sinclair, J., Stryjczyk, M., Van Duppen, P., Viñals, S., Virtanen, V., Warr, N., Wrzosek-Lipska, K., and Zielinska, M.

Abstract

There is a large body of evidence that atomic nuclei can undergo octupole distortion and assume the shape of a pear. This phenomenon is important for measurements of electric-dipole moments of atoms, which would indicate CP violation and hence probe physics beyond the Standard Model of particle physics. Isotopes of both radon and radium have been identified as candidates for such measurements. Here, we observed the low-lying quantum states in Rn and Rn by accelerating beams of these radioactive nuclei. We show that radon isotopes undergo octupole vibrations but do not possess static pear-shapes in their ground states. We conclude that radon atoms provide less favourable conditions for the enhancement of a measurable atomic electric-dipole moment.

Published
2019

3. Cross section measurements of the 3He(alpha, gamma) 7Be reaction using DRAGON at TRIUMF.

Author

Science and Technology Facilities Council (UK), Nara Singh, B.S., Sjue, S.K.L., Davids, B., Hass, M., Adsley, P., Buchmann, L., Carmona Gallardo, M., Fallis, J., Fox, S.P., Fulton, B., Galinski, N., Hager, U., Hutcheon, D.A., Laird, A.M., Martín, L., Ottewell, D., Reeve, S., Ruiz, C., Ruprecht, G., Shotter, A., Tengblad, Olof, Science and Technology Facilities Council (UK), Nara Singh, B.S., Sjue, S.K.L., Davids, B., Hass, M., Adsley, P., Buchmann, L., Carmona Gallardo, M., Fallis, J., Fox, S.P., Fulton, B., Galinski, N., Hager, U., Hutcheon, D.A., Laird, A.M., Martín, L., Ottewell, D., Reeve, S., Ruiz, C., Ruprecht, G., Shotter, A., and Tengblad, Olof

Abstract

We present our initial efforts with the DRAGON separator at TRIUMF facility towards obtaining the energy dependence of the astrophysical S-factor for 3He(¿, ¿)7Be reaction in the energy range of Ecm = 2 to 3 MeV that was recommended by the recent evaluations. A comparison between the existing data and our new complementary Madrid data, together with the recent theoretical calculations, is also given in the context of our ongoing work.

Published
2012

4. High-spin isomers in 96Ag : excitations across the Z=38 and Z=50, N=50 closed shells

Author

Boutachkov, P., Górska, M., Grawe, H., Blazhev, A., Braun, N., Brock, T.S., Liu, Z., Nara Singh, B.S., Wadsworth, R., Pietri, S., Domingo-Pardo, C., Kojouharov, I., Cáceres, L., Engert, T., Farinon, F., Gerl, J., Goel, N., Grebosz, J., Hoischen, R., Kurz, N., Nociforo, C., Prochazka, A., Schaffner, H., Steer, S. J., Weick, H., Wollersheim, H-J., Faestermann, T., Podolyák, Zs., Rudolph, D., Atac Nyberg, Ayse, Bettermann, L., Eppinger, K., Finke, F., Geibel, K., Gottardo, A., Hinke, C., Ilie, G., Iwasaki, H., Jolie, J., Krücken, R., Merchán, E., Nyberg, Johan, Pfützner, M., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Söderström, P.-A., Warr, N., Woods, P. J., Nowacki, F., Sieja, K., Boutachkov, P., Górska, M., Grawe, H., Blazhev, A., Braun, N., Brock, T.S., Liu, Z., Nara Singh, B.S., Wadsworth, R., Pietri, S., Domingo-Pardo, C., Kojouharov, I., Cáceres, L., Engert, T., Farinon, F., Gerl, J., Goel, N., Grebosz, J., Hoischen, R., Kurz, N., Nociforo, C., Prochazka, A., Schaffner, H., Steer, S. J., Weick, H., Wollersheim, H-J., Faestermann, T., Podolyák, Zs., Rudolph, D., Atac Nyberg, Ayse, Bettermann, L., Eppinger, K., Finke, F., Geibel, K., Gottardo, A., Hinke, C., Ilie, G., Iwasaki, H., Jolie, J., Krücken, R., Merchán, E., Nyberg, Johan, Pfützner, M., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Söderström, P.-A., Warr, N., Woods, P. J., Nowacki, F., and Sieja, K.

Abstract

Excited states in (96)Ag were populated in fragmentation of an 850-MeV/u (124)Xe beam on a 4-g/cm(2) Be target. Three new high-spin isomers were identified and the structure of the populated states was investigated. The level scheme of (96)Ag was established, and a spin parity of (13(-)), (15(+)), and (19(+)) was assigned to the new isomeric states. Shell-model calculations were performed in various model spaces, including pi nu(p(1/2), g(9/2), f(5/2), p(3/2)) and the large-scale shell-model space pi nu(gds), to account for the observed parity changing M2 and E3 transitions from the (13(-)) isomer and the E2 and E4 transitions from the (19(+)) core-excited isomer, respectively. The calculated level schemes and reduced transition strengths are found to be in very good agreement with the experiment., QC 20120220

Published
2011
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