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11 results on '"Chamoli, S K"'

1. Measured g factors and the tidal-wave description of transitional nuclei near A = 100

Author

Chamoli, S. K., Stuchbery, A. E., Frauendorf, S., Sun, J., Gu, Y., Leslie, R. F., Moore, P. T., Wakhle, A., East, M. C., Kibédi, T., and Wilson, A. N.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The transient-field technique has been used in both conventional kinematics and inverse kinematics to measure the g factors of the 2+ states in the stable even isotopes of Ru, Pd and Cd. The statistical precision of the g(2+) values has been significantly improved, allowing a critical comparison with the tidal-wave version of the cranking model recently proposed for transitional nuclei in this region., Comment: Accepted for publication in Physical Review C, April 2011

Published
2011
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2. Precision Measurement of the Decay Rate of 7Be in Host Materials

Author

Nir-El, Y., Haquin, G., Yungreiss, Z., Hass, M., Goldring, G., Chamoli, S. K., Singh, B. S. Nara, Lakshmi, S., Koester, U., Champault, N., Dorsival, A., Georgiev, G., Fedoseyev, V. N., Marsh, B. A., Schumann, D., Heidenreich, G., and Teichmann, S.

Subjects
Nuclear Experiment
Abstract

A controlled and precise determination of the cross-sections of the fusion reactions 7Be(p,gamma)8B and 3He(4He,gamma)7Be, which play an important role in determining the solar neutrino flux, necessitates the knowledge of a precise value of the electron-capture half-life of 7Be. This half-life may depend on the material hosting the 7Be atoms via small modifications of the electron density around the 7Be nucleus. In this brief communication we report on the measurement of 7Be implanted in four materials: copper, aluminum, sapphire and PVC. The four results are consistent with a null host dependence within two standard deviations and their weighted average of 53.236(39)d agrees very well with the adopted value in the literature, 53.22(6)d. The present results may exhibit a slight (0.22%) increase of the half-life at room temperature for metals compared to insulators that requires further studies., Comment: 4 pages, 4 figures. Accepted for publication in Phys. Rev. C (Rapid Communications)

Published
2006
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4. First isomeric quadrupole moment measured in fragmentation reactions: The case of $^{61}$Fe$^{m}(9/2^{+})$

Author

Vermeulen, N, Chamoli, S K, Daugas, J M, Hass, M, Balabanski, D L, Delaroche, J P, De Oliveira-Santos, F, Georgiev, G, Girod, M, Goldring, G, Goutte, H, Grévy, S, Matea, I, Morel, P, Nara-Singh, B S, Penionzkevich, Yu E, Perrot, L, Perru, O, Péru, S, Roig, O, Sarazin, F, Simpson, G S, Sobolev, Yu, Stefan, I, Stodel, C, Yordanov, D T, and Neyens, G

Subjects
Nuclear Physics - Experiment
Published
2007

5. Precision measurement of the decay rate of $^7Be$ in host materials

Author

Nir-El, Y., Haquin, G., Yungreiss, Z., Hass, M., Goldring, G., Chamoli, S. K., Singh, B. S. Nara, Lakshmi, S., Koester, U., Champault, N., Dorsival, A., Georgiev, G., Fedoseyev, V. N., Marsh, B. A., Schumann, D., Heidenreich, G., Teichmann, S., Institut Laue-Langevin (ILL), ILL, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
25.40.Lw, 21.10.Tg, 26.20.+f, 27.20.+n, proton-nucleus reactions, nuclei with mass number 6 to 19, heavy ion fusion reactions, FOS: Physical sciences, Nuclear Physics - Experiment, tritons, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, alpha particle-nucleus reactions, nuclear energy level lifetimes
Abstract

A controlled and precise determination of the cross-sections of the fusion reactions 7Be(p,gamma)8B and 3He(4He,gamma)7Be, which play an important role in determining the solar neutrino flux, necessitates the knowledge of a precise value of the electron-capture half-life of 7Be. This half-life may depend on the material hosting the 7Be atoms via small modifications of the electron density around the 7Be nucleus. In this brief communication we report on the measurement of 7Be implanted in four materials: copper, aluminum, sapphire and PVC. The four results are consistent with a null host dependence within two standard deviations and their weighted average of 53.236(39)d agrees very well with the adopted value in the literature, 53.22(6)d. The present results may exhibit a slight (0.22%) increase of the half-life at room temperature for metals compared to insulators that requires further studies., 4 pages, 4 figures. Accepted for publication in Phys. Rev. C (Rapid Communications)

Published
2007
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6. INVESTIGATING PROLATE-OBLATE SHAPE INVERSION IN Pt NUCLEI NEAR A ~ 188.

Author

CHAMOLI, S. K., ROHILLA, AMAN, GUPTA, C. K., SINGH, R. P., MURALITHAR, S., CHAKRABORTY, S., SHARMA, H. P., KUMAR, A., GOVIL, I. M., and BISWAS, D. C.

Subjects
*PLATINUM, *DOPPLER effect, *PARTICLE accelerators, *NUCLEAR reactions, *NUCLEAR spin
Abstract

Lifetimes have been measured of the low- and intermediate-spins states in 188Pt nucleus using the recoil distance Doppler shift technique at IUAC, Delhi. The nuclear states of interest were populated via 174Yb(18O,4n)188Pt reaction at a beam energy of 79 MeV provided by 15 UD Pelletron accelerator. The extracted B(E2) values show an increase up to 4+ state and then a near constant behavior with spin along yrast band, indicating change of the nuclear shape in 188Pt at low spins. The average absolute β2 = 0:20(3) obtained from measured B(E2) values matches well the values predicted by CHFB and IBM calculations for oblate (β2 ~ -0:19) and prolate (β2 ~ 0:22) shapes. [ABSTRACT FROM AUTHOR]

Published
2017
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7. g-factor measurements at RISING: The cases of 127Sn and 128Sn

Author

Atanasova, L., Balabanski, D. L., Chamoli, S. K., Hass, M., Simpson, G., Bazzacco, D., Becker, F., Bednarczyk, P., Benzoni, G., Blasi, N., Blazhev, A., Bracco, A., Brandau, C., Caceres, L., Camera, F., Crespi, F. C. L., Detistov, P., Doornenbal, P., Fahlander, C., Farnea, E., Georgiev, G., Gerl, J., Gladnishki, K. A., Gorska, M., Grebosz, J., Hoischen, R., Ilie, G., Ionescu-Bujor, M., Iordachescu, A., Jungclaus, A., Lo Bianco, G., Kmiecik, M., Kojouharov, I., Kurz, N., Lakshmi, S., Lozeva, R., Maj, A., Montanari, D., Neyens, G., Pfutzner, M., Pietri, S., Podolyak, Z., Prokopowicz, W., Rudolph, D., Rusev, G., Saito, T. R., Saltarelli, A., Schaffner, H., Schwengner, R., Tashenov, S., Valiente-Dobon, J. J., Vermeulen, N., Walker, J., Werner-Malento, E., Wieland, O., Wollersheim, H. J., Grawe, H., Hjorth-Jensen, M., Atanasova, L., Balabanski, D. L., Chamoli, S. K., Hass, M., Simpson, G., Bazzacco, D., Becker, F., Bednarczyk, P., Benzoni, G., Blasi, N., Blazhev, A., Bracco, A., Brandau, C., Caceres, L., Camera, F., Crespi, F. C. L., Detistov, P., Doornenbal, P., Fahlander, C., Farnea, E., Georgiev, G., Gerl, J., Gladnishki, K. A., Gorska, M., Grebosz, J., Hoischen, R., Ilie, G., Ionescu-Bujor, M., Iordachescu, A., Jungclaus, A., Lo Bianco, G., Kmiecik, M., Kojouharov, I., Kurz, N., Lakshmi, S., Lozeva, R., Maj, A., Montanari, D., Neyens, G., Pfutzner, M., Pietri, S., Podolyak, Z., Prokopowicz, W., Rudolph, D., Rusev, G., Saito, T. R., Saltarelli, A., Schaffner, H., Schwengner, R., Tashenov, S., Valiente-Dobon, J. J., Vermeulen, N., Walker, J., Werner-Malento, E., Wieland, O., Wollersheim, H. J., Grawe, H., and Hjorth-Jensen, M.

Abstract

We report g-factor measurements for the 19/2+ T1/2 = 4.5(3) µs isomer in 127 Sn and the 10+ T1/2 = 2.69(23) µs isomer in 128 Sn. The experiment was carried out on isomers which were produced and spin-aligned in relativistic heavy-ion fragmentation at GSI and were selected and separated by the GSI fragment separator (FRS). The gamma-rays of the isomer decay were detected by the RISING array. The method of time-differential perturbed angular distribution was utilized. The measured g factors, g(19/2+ ;127 Sn) = -0.17(2) and g(10+ ;128 Sn) = -0.20(4), are compared with shell model calculations. The results demonstrate the feasibility of the method for similar measurements in exotic neutron-rich nuclei.

Published
2010

8. New sub-\mu s isomers in 125,127,129Sn and isomer systematics of 124-130 Sn

Author

Lozeva, R. L., Simpson, G. S., Grawe, H., Neyens, G., Atanasova, L. A., Balabanski, D. L., Bazzacco, D., Becker, F., Bednarczyk, P., Benzoni, G., Blasi, N., Blazhev, A., Bracco, A., Brandau, C., Caceres, L., Camera, F., Chamoli, S. K., Crespi, F. C. L., Daugas, J.-M., Detistov, P., Rydt, M., Doornenbal, P., Fahlander, C., Farnea, E., Georgiev, G., Gerl, J., Gladnishki, K. A., Gorska, M., Grebosz, J., Hass, M., Hoischen, R., Ilie, G., Ionescu-Bujor, M., Iordachescu, A., Jolie, J., Jungclaus, A., Kmiecik, M., Kojouharov, I., Kurz, N., Lakshmi, S. P., Lo Bianco, G., Mallion, S., Maj, A., Montanari, D., Perru, O., Pfützner, M., Pietri, S., Pinston, J. A., Podolyak, Z., Prokopowicz, W., Rudolph, D., Rusev, G., Saitoh, T. R., Saltarelli, A., Schaffner, H., Schwengner, R., Tashenov, S., Turzo, K., Valiente-Dobon, J. J., Vermeulen, N., Walker, J., Werner-Malento, E., Wieland, O., Wollersheim, H.-J., Lozeva, R. L., Simpson, G. S., Grawe, H., Neyens, G., Atanasova, L. A., Balabanski, D. L., Bazzacco, D., Becker, F., Bednarczyk, P., Benzoni, G., Blasi, N., Blazhev, A., Bracco, A., Brandau, C., Caceres, L., Camera, F., Chamoli, S. K., Crespi, F. C. L., Daugas, J.-M., Detistov, P., Rydt, M., Doornenbal, P., Fahlander, C., Farnea, E., Georgiev, G., Gerl, J., Gladnishki, K. A., Gorska, M., Grebosz, J., Hass, M., Hoischen, R., Ilie, G., Ionescu-Bujor, M., Iordachescu, A., Jolie, J., Jungclaus, A., Kmiecik, M., Kojouharov, I., Kurz, N., Lakshmi, S. P., Lo Bianco, G., Mallion, S., Maj, A., Montanari, D., Perru, O., Pfützner, M., Pietri, S., Pinston, J. A., Podolyak, Z., Prokopowicz, W., Rudolph, D., Rusev, G., Saitoh, T. R., Saltarelli, A., Schaffner, H., Schwengner, R., Tashenov, S., Turzo, K., Valiente-Dobon, J. J., Vermeulen, N., Walker, J., Werner-Malento, E., Wieland, O., and Wollersheim, H.-J.

Abstract

New sub-\mu s isomers have been observed in the neutron-rich Sn isotopes. 125,127,129Sn nuclei have been produced in a relativistic fission reaction of 238U on a 9Be target at 750 A MeV and by the fragmentation of 136Xe at 600 A MeV populating high-spin yrast states. In addition to the already known \mu s isomers, three new ones -1 with sub-\mu s half-lives have been observed. These yrast isomers are the high-spin members of the \nu (d_3/2^-1 h_11/2^-2 ) and \nu h_11/2 ^-n, seniority v = 3 multiplets leading to isomeric (23/2+) and (27/2-) states, respectively. Added to the already known 19/2+ \mu s isomers in this region the current work completes the systematic information of neutron-hole excitations toward the filling of the last h_11/2 orbital a t N = 82. The results are discussed in the framework of state-of-the -art shell-model calculations using realistic interactions.

Published
2008

9. g-factor measurements on relativistic isomeric beams produced by fragmentation and U-fission: the g-Rising project at GSI

Author

Neyens, G., Atanasova, L., Balabanski, D. L., Becker, F., Bednarczyk, P., Caceres, L., Doornenbal, P., Gerl, J., Gorska, M., Grebosz, J., Hass, M., Ilie, G., Kurz, N., Kojouharov, I., Lozeva, R., Maj, A., Pfutzner, M., Pietri, S., Podolyak, Z., Prokopowicz, W., Saitoh, T. R., Schaffner, H., Simpson, G., Vermeulen, N., Werner-Malento, E., Walker, J., Wollersheim, H. J., Bazzacco, D., Benzoni, G., Blazhev, A., Blasi, N., Bracco, A., Brandau, C., Camera, F., Chamoli, S. K., Chmel, S., Crespi, F. C. L., Daugas, J. M., Rydt, M., Detistov, P., Fahlander, C., Farnea, E., Georgiev, G., Gladnishki, K., Hoischen, R., Ionescu-Bujor, M., Iordachescu, A., Jolie, J., Jungclaus, A., Kmiecik, M., Krasznahorkay, A., Kulessa, R., Lakshmi, S., Lo Bianco, G., Mallion, S., Mazurek, K., Meczynski, W., Montanari, D., Myalsky, S., Perru, O., Rudolph, D., Rusev, G., Saltarelli, A., Schwengner, R., Styczen, J., Turzo, K., Valiente-Dobon, J. J., Wieland, O., Zieblinski, M., Neyens, G., Atanasova, L., Balabanski, D. L., Becker, F., Bednarczyk, P., Caceres, L., Doornenbal, P., Gerl, J., Gorska, M., Grebosz, J., Hass, M., Ilie, G., Kurz, N., Kojouharov, I., Lozeva, R., Maj, A., Pfutzner, M., Pietri, S., Podolyak, Z., Prokopowicz, W., Saitoh, T. R., Schaffner, H., Simpson, G., Vermeulen, N., Werner-Malento, E., Walker, J., Wollersheim, H. J., Bazzacco, D., Benzoni, G., Blazhev, A., Blasi, N., Bracco, A., Brandau, C., Camera, F., Chamoli, S. K., Chmel, S., Crespi, F. C. L., Daugas, J. M., Rydt, M., Detistov, P., Fahlander, C., Farnea, E., Georgiev, G., Gladnishki, K., Hoischen, R., Ionescu-Bujor, M., Iordachescu, A., Jolie, J., Jungclaus, A., Kmiecik, M., Krasznahorkay, A., Kulessa, R., Lakshmi, S., Lo Bianco, G., Mallion, S., Mazurek, K., Meczynski, W., Montanari, D., Myalsky, S., Perru, O., Rudolph, D., Rusev, G., Saltarelli, A., Schwengner, R., Styczen, J., Turzo, K., Valiente-Dobon, J. J., Wieland, O., and Zieblinski, M.

Abstract

Within the RISING (Rare ISotope INvestigations @ GSI) Collabora-tion at GSI, g factor measurements have been performed on isomeric states in neutron-rich isotopes approaching 132 Sn and in the neutron deficient Pb-region (the g-RISING campaign). We present the experimental technique and some typical aspects related to such studies on relativistic beams selected with the FRS fragment separator. First results are presented for the (19/2+ ) 4.5 µs isomeric state in 127 Sn, which has been produced by means of fission of a relativistic 238 U beam on the one hand, and by the fragmentation of a relativistic 136 Xe beam on the other hand. Spin-alignment has been observed in both reactions. It was the first time that spin-alignment has been established in a relativistic fission reaction.

Published
2007

10. g-factor measurements at RISING: the case of 127Sn

Author

Atanasova, L., Balabanski, D. L., Hass, M., Bazzacco, D., Becker, F., Bednarczyk, P., Benzoni, G., Blasi, N., Blazhev, A., Bracco, A., Brandau, C., Caceres, L., Camera, F., Chamoli, S. K., Crespi, F. C. L., Detistov, P., Doornenbal, P., Fahlander, C., Farnea, E., Georgiev, G., Gerl, J., Gladnishki, K., Gorska, M., Grawe, H., Grebosz, J., Hoischen, R., Ilie, G., Ionescu-Bujor, M., Iordachescu, A., Jungclaus, A., Lo Bianco, G., Kmiecik, M., Kojouharov, I., Kurz, N., Lakshmi, S., Lozeva, R., Maj, A., Montanari, D., Neyens, G., Pfützner, M., Pietri, S., Podolyak, Z., Prokopowicz, W., Rudolph, D., Rusev, G., Saito, T. R., Saltarelli, A., Schaffner, H., Schwengner, R., Simpson, G., Tashenov, S., Valiente-Dobon, J. J., Vermeulen, N., Walker, J., Werner-Malento, E., Wieland, O., Wollersheim, H. J., Atanasova, L., Balabanski, D. L., Hass, M., Bazzacco, D., Becker, F., Bednarczyk, P., Benzoni, G., Blasi, N., Blazhev, A., Bracco, A., Brandau, C., Caceres, L., Camera, F., Chamoli, S. K., Crespi, F. C. L., Detistov, P., Doornenbal, P., Fahlander, C., Farnea, E., Georgiev, G., Gerl, J., Gladnishki, K., Gorska, M., Grawe, H., Grebosz, J., Hoischen, R., Ilie, G., Ionescu-Bujor, M., Iordachescu, A., Jungclaus, A., Lo Bianco, G., Kmiecik, M., Kojouharov, I., Kurz, N., Lakshmi, S., Lozeva, R., Maj, A., Montanari, D., Neyens, G., Pfützner, M., Pietri, S., Podolyak, Z., Prokopowicz, W., Rudolph, D., Rusev, G., Saito, T. R., Saltarelli, A., Schaffner, H., Schwengner, R., Simpson, G., Tashenov, S., Valiente-Dobon, J. J., Vermeulen, N., Walker, J., Werner-Malento, E., Wieland, O., and Wollersheim, H. J.

Published
2006

11. g factor measurements on relativistic isomeric beams produced by fragmentation and U-fission: The g-rising project at GSI

Author

Neyens, G., Liliya Atanasova, Balabanski, D. L., Becker, F., Bednarczyk, P., Caceres, L., Doornenbal, P., Gerl, J., Górska, M., Grȩbosz, J., Hass, M., Ilie, G., Kurz, N., Kojouharov, I., Lozeva, R., Maj, A., Pfützner, M., Pietri, S., Podolyak, Zs, Prokopowicz, W., Saitoh, T. R., Schaffner, H., Simpson, G., Vermeulen, N., Werner-Malento, E., Walker, J., Wollersheim, H. J., Bazzacco, D., Benzoni, G., Blazhev, A., Blasi, N., Bracco, A., Brandau, C., Camera, F., Chamoli, S. K., Chmel, S., Crespi, F. C. L., Daugas, J. M., Rydt, M., Detistov, P., Fahlander, C., Farnea, E., Georgiev, G., Gladnishki, K., Hoischen, R., Ionescu-Bujor, M., Iordachescu, A., Jolie, J., Jungclaus, A., Kmiecik, M., Krasznahorkay, A., Kulessa, R., Lakshmi, S., Lo Bianco, G., Mallion, S., Mazurek, K., Meczynski, W., Montanari, D., Myalsky, S., Perru, O., Rudolph, D., Rusev, G., Saltarelli, A., Schwengner, R., Styczen, J., Turzó, K., Valiente-Dobón, J. J., Wieland, O., and Zieblinski, M.

Subjects
sn-132, spin-alignment, fragmentation, nuclei, Settore FIS/01 - Fisica Sperimentale, cf-252, g-factor, gamma-ray, alignment, g-RISING, Settore FIS/04 - Fisica Nucleare e Subnucleare
Abstract

Within the RISING (Rare ISotope INvestigations @ GSI) Collaboration at GSI, g factor measurements have been performed on isomeric states in neutron-rich isotopes approaching Sn-132 and in the neutron deficient Pb-region (the g-RISING campaign). We present the experimental technique and some typical aspects related to such studies on relativistic beams selected with the FRS fragment separator. First results are presented for the (19/2(+)) 4.5 mu s isomeric state in Sn-127, which has been produced by means of fission of a relativistic U-238 beam on the one hand, and by the fragmentation of a relativistic Xe-136 beam on the other hand. Spin-alignment has been observed in both reactions. It was the first time that spin-alignment has been established in a relativistic fission reaction. ispartof: pages:1237-1247 ispartof: Acta Physica Polonica B vol:38 issue:4 pages:1237-1247 ispartof: location:Zakopane status: published

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