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3. Decay study of 246Fm at SHIP

Author

Venhart, M., Heßberger, F. P., Ackermann, D., Antalic, S., Gray-Jones, C., Greenlees, P. T., Heinz, S., Herzberg, R. -D., Hofmann, S., Ketelhut, S., Kindler, B., Kojouharov, I., Leino, M., Lommel, B., Mann, R., Papadakis, P., Rostron, D., Rudolph, D., Šáro, Š., and Sulignano, B.

Published
2011
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5. Search for a 2-quasiparticle high-K isomer in Rf256

Author

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

Abstract

The energies of 2-quasiparticle (2-qp) states in heavy shell-stabilized nuclei provide information on the single-particle states that are responsible for the stability of superheavy nuclei. We have calculated the energies of 2-qp states in Rf256, which suggest that a long-lived, low-energy 8- isomer should exist. A search was conducted for this isomer through a calorimetric conversion electron signal, sandwiched in time between implantation of a Rf256 nucleus and its fission decay, all within the same pixel of a double-sided Si strip detector. A 17(5)-μs isomer was identified. However, its low population, ~5(2)% that of the ground state instead of the expected ~30%, suggests that it is more likely a 4-qp isomer. Possible reasons for the absence of an electromagnetic signature of a 2-qp isomer decay are discussed. These include the favored possibility that the isomer decays by fission, with a half-life indistinguishably close to that of the ground state. Another possibility, that there is no 2-qp isomer at all, would imply an abrupt termination of axially symmetric deformed shapes at Z=104, which describes nuclei with Z=92-103 very well.

Published
2011
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6. Search for a 2-quasiparticle high-K isomer in (256)Rf

Author

Robinson, A.P., Khoo, T.L., Seweryniak, D., Ahmad, I., Asai, M., Back, B.B., Carpenter, M.P., Chowdhury, P., Davids, C.N., Greene, J., Greenlees, P.T., Hauschild, K., Heinz, A., Herzberg, R.D., Janssens, R.V.F., Jenkins, D.G., Jones, G.D., Ketelhut, S., Kondev, F.G., Lauritsen, T., J. Lister, C., Lopez-Martens, A., Marley, P., Mccutchan E, E., Papadakis, P., Peterson, D., Qian, J., Rostron, D., Shirwadkar, U., Stefanescu, I., Tandel, S.K., Wang, X., Zhu, S., 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
QUASI-PARTICLE STATES, SPECTROSCOPY, STABILITY, DEFORMATION, ISOTOPES, SUPERHEAVY ELEMENTS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], FISSION, DECAY, HEAVIEST NUCLEI, HEAVY-ELEMENTS
Abstract

The energies of 2-quasiparticle (2-qp) states in heavy shell-stabilized nuclei provide information on the single-particle states that are responsible for the stability of superheavy nuclei. We have calculated the energies of 2-qp states in (256)Rf, which suggest that a long-lived, low-energy 8(-) isomer should exist. A search was conducted for this isomer through a calorimetric conversion electron signal, sandwiched in time between implantation of a (256)Rf nucleus and its fission decay, all within the same pixel of a double-sided Si strip detector. A 17(5)-mu s isomer was identified. However, its low population, similar to 5(2)% that of the ground state instead of the expected similar to 30%, suggests that it is more likely a 4-qp isomer. Possible reasons for the absence of an electromagnetic signature of a 2-qp isomer decay are discussed. These include the favored possibility that the isomer decays by fission, with a half-life indistinguishably close to that of the ground state. Another possibility, that there is no 2-qp isomer at all, would imply an abrupt termination of axially symmetric deformed shapes at Z = 104, which describes nuclei with Z = 92-103 very well.

Published
2011
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7. K-Isomer in 252No

Author

Sulignano, B., Theisen, Ch., Ljungvall, J., Ackermann, D., Antalic, S., Dorvaux, O., Drouart, A., Görgen, A., T. Greenlees, P., Hauschild, K., D. Herzberg, R., P. Heβberger, F., Hofmann, S., Jakobsson, U., Jones, P., Julin, R., Juutinen, S., Ketelhut, S., Korten, W., Leino, M., Nyman, M., Obertelli, A., Pakarinen, J., Parr, E., Papadakis, P., Peura, P., Piot, J., Rahkila, P., Rostron, D., Ruotsalainen, P., Saren, J., Scholey, C., Sorri, J., Uusitalo, J., Venhart, M., Zielińska, M., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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)-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)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2009
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8. Evidence for prolate structure in light Pb isotopes from in-beam gamma-ray spectroscopy of 185Pb

Author

Pakarinen, J, Andreev, Andrei, Julin, R, Juutinen, S, Antalic, S, Bianco, L, Darby, Iain Gerard, Eeckhaudt, Sarah, Grahn, Tuomas, Greenlees, PT, Jenkins, David G, Jones, P, Joshi, P, Kettunen, H, Leino, M, Leppanen, A-P, Nieminen, P, Nyman, M, Page, Robert D, Perkowski, J, Raddon, PM, Rahkila, P, Rostron, D, Saren, J, Scholey, C, Sorri, J, Streicher, B, Uusitalo, J, Van de Vel, Karen, Venhart, Martin, Wadsworth, R, and Wiseman, DR

Abstract

For the first time, excited states in 185Pb have been observed in in-beam gamma-ray spectroscopic measurements using the recoil-decay tagging method. The resulting level scheme reveals a strongly coupled yrast band structure that originates from coupling of the i_13/2 quasineutron to a prolate deformed core. The band is also observed to de-excite via the spherical alpha-decaying 13/2+ isomeric state. ispartof: Physical Review C, Nuclear Physics vol:80 issue:3 status: published

Published
2009

9. gamma-Ray Spectroscopy at the Limits : First Observation of Rotational Bands in Lr-255

Author

Ketelhut, S., Greenlees, P. T., Ackermann, D., Antalic, S., Clement, E., Darby, I. G., Dorvaux, O., Drouart, A., Eeckhaudt, S., Gall, B. J. P., Goergen, A., Grahn, T., Gray-Jones, C., Hauschild, K., Herzberg, R. -D, Hessberger, F. P., Jakobsson, U., Jones, G. D., Jones, P., Julin, R., Juutinen, S., Khoo, T. -L, Korten, W., Leino, M., Leppaenen, A. -P, Ljungvall, J., Moon, S., Nyman, M., Obertelli, A., Pakarinen, J., Parr, E., Papadakis, P., Peura, P., Piot, J., Pritchard, A., Rahkila, P., Rostron, D., Ruotsalainen, P., Sandzelius, Mikael, Saren, J., Scholey, C., Sorri, J., Steer, A., Sulignano, B., Theisen, Ch., Uusitalo, J., Venhart, M., Zielinska, M., Bender, M., Heenen, P. -H, Ketelhut, S., Greenlees, P. T., Ackermann, D., Antalic, S., Clement, E., Darby, I. G., Dorvaux, O., Drouart, A., Eeckhaudt, S., Gall, B. J. P., Goergen, A., Grahn, T., Gray-Jones, C., Hauschild, K., Herzberg, R. -D, Hessberger, F. P., Jakobsson, U., Jones, G. D., Jones, P., Julin, R., Juutinen, S., Khoo, T. -L, Korten, W., Leino, M., Leppaenen, A. -P, Ljungvall, J., Moon, S., Nyman, M., Obertelli, A., Pakarinen, J., Parr, E., Papadakis, P., Peura, P., Piot, J., Pritchard, A., Rahkila, P., Rostron, D., Ruotsalainen, P., Sandzelius, Mikael, Saren, J., Scholey, C., Sorri, J., Steer, A., Sulignano, B., Theisen, Ch., Uusitalo, J., Venhart, M., Zielinska, M., Bender, M., and Heenen, P. -H

Abstract

The rotational band structure of Lr-255 has been investigated using advanced in-beam gamma-ray spectroscopic techniques. To date, Lr-255 is the heaviest nucleus to be studied in this manner. One rotational band has been unambiguously observed and strong evidence for a second rotational structure was found. The structures are tentatively assigned to be based on the 1/2(-)[521] and 7/2(-)[514] Nilsson states, consistent with assignments from recently obtained alpha decay data. The experimental rotational band dynamic moment of inertia is used to test self-consistent mean-field calculations using the Skyrme SLy4 interaction and a density-dependent pairing force., QC 20110415

Published
2009
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10. Investigation of high-Kstates in252No

Author

Sulignano, B., primary, Theisen, Ch., additional, Delaroche, J.-P., additional, Girod, M., additional, Ljungvall, J., additional, Ackermann, D., additional, Antalic, S., additional, Dorvaux, O., additional, Drouart, A., additional, Gall, B., additional, Görgen, A., additional, Greenlees, P. T., additional, Hauschild, K., additional, Herzberg, R.-D., additional, Heßberger, F. P., additional, Jakobsson, U., additional, Jones, P., additional, Julin, R., additional, Juutinen, S., additional, Ketelhut, S., additional, Korten, W., additional, Leino, M., additional, Lopez-Martens, A., additional, Nyman, M., additional, Obertelli, A., additional, Pakarinen, J., additional, Papadakis, P., additional, Parr, E., additional, Peura, P., additional, Piot, J., additional, Rahkila, P., additional, Rostron, D., additional, Ruotsalainen, P., additional, Sarén, J., additional, Scholey, C., additional, Sorri, J., additional, Uusitalo, J., additional, Venhart, M., additional, and Zielińska, M., additional

Published
2012
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11. 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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12. Bridging the nuclear structure gap between stable and super heavy nuclei

Author

Seweryniak, D., primary, Khoo, T.L., additional, Ahmad, I., additional, Kondev, F.G., additional, Robinson, A., additional, Tandel, S.K., additional, Asai, M., additional, Back, B.B., additional, Carpenter, M.P., additional, Chowdhury, P., additional, Davids, C.N., additional, Eeckhaudt, S., additional, Greene, J.P., additional, Greenlees, P.T., additional, Gros, S., 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, Lauritsen, T., additional, Lister, C.J., additional, Lopez-Martens, A., additional, Marley, P., additional, McCutchan, E.A., additional, Nakatsukasa, T., additional, Papadakis, P., additional, Peterson, D., additional, Qian, J., additional, Rostron, D., additional, Stefanescu, I., additional, Tandel, U.S., additional, Wang, X.F., additional, and Zhu, S.F., additional

Published
2010
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13. K Isomer in [sup 252]No

Author

Sulignano, B., primary, Theisen, Ch., additional, Ljungvall, J., additional, Ackermann, D., additional, Antalic, S., additional, Dorvaux, O., additional, Drouart, A., additional, Görgen, A., additional, Greenlees, P. T., additional, Hauschild, K., additional, Herzberg, R. D., additional, Heβberger, F. P., additional, Hofmann, S., additional, Jakobsson, U., additional, Jones, P., additional, Julin, R., additional, Juutinen, S., additional, Ketelhut, S., additional, Korten, W., additional, Leino, M., additional, Nyman, M., additional, Obertelli, A., additional, Pakarinen, J., additional, Parr, E., additional, Papadakis, P., additional, Peura, P., additional, Piot, J., additional, Rahkila, P., additional, Rostron, D., additional, Ruotsalainen, P., additional, Saren, J., additional, Scholey, C., additional, Sorri, J., additional, Uusitalo, J., additional, Venhart, M., additional, Zielińska, M., additional, Penionzhkevich, Yu. E., additional, and Lukyanov, S. M., additional

Published
2010
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14. Evidence for prolate structure in light Pb isotopes from in-beamγ-ray spectroscopy ofPb185

Author

Pakarinen, J., primary, Andreyev, A. N., additional, Julin, R., additional, Juutinen, S., additional, Antalic, S., additional, Bianco, L., additional, Darby, I. G., additional, Eeckhaudt, S., additional, Grahn, T., additional, Greenlees, P. T., additional, Jenkins, D. G., additional, Jones, P., additional, Joshi, P., additional, Kettunen, H., additional, Leino, M., additional, Leppänen, A. -P., additional, Nieminen, P., additional, Nyman, M., additional, Page, R. D., additional, Perkowski, J., additional, Raddon, P. M., additional, Rahkila, P., additional, Rostron, D., additional, Saren, J., additional, Scholey, C., additional, Sorri, J., additional, Streicher, B., additional, Uusitalo, J., additional, de Vel, K. Van, additional, Venhart, M., additional, Wadsworth, R., additional, and Wiseman, D. R., additional

Published
2009
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15. γ-Ray Spectroscopy at the Limits: First Observation of Rotational Bands inLr255

Author

Ketelhut, S., primary, Greenlees, P. T., additional, Ackermann, D., additional, Antalic, S., additional, Clément, E., additional, Darby, I. G., additional, Dorvaux, O., additional, Drouart, A., additional, Eeckhaudt, S., additional, Gall, B. J. P., additional, Görgen, A., additional, Grahn, T., additional, Gray-Jones, C., additional, Hauschild, K., additional, Herzberg, R.-D., additional, Heßberger, F. P., additional, Jakobsson, U., additional, Jones, G. D., additional, Jones, P., additional, Julin, R., additional, Juutinen, S., additional, Khoo, T.-L., additional, Korten, W., additional, Leino, M., additional, Leppänen, A.-P., additional, Ljungvall, J., additional, Moon, S., additional, Nyman, M., additional, Obertelli, A., additional, Pakarinen, J., additional, Parr, E., additional, Papadakis, P., additional, Peura, P., additional, Piot, J., additional, Pritchard, A., additional, Rahkila, P., additional, Rostron, D., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scholey, C., additional, Sorri, J., additional, Steer, A., additional, Sulignano, B., additional, Theisen, Ch., additional, Uusitalo, J., additional, Venhart, M., additional, Zielinska, M., additional, Bender, M., additional, and Heenen, P.-H., additional

Published
2009
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16. High-Kstructure inFm250and the deformed shell gaps atN=152andZ=100

Author

Greenlees, P. T., primary, Herzberg, R.-D., additional, Ketelhut, S., additional, Butler, P. A., additional, Chowdhury, P., additional, Grahn, T., additional, Gray-Jones, C., additional, Jones, G. D., additional, Jones, P., additional, Julin, R., additional, Juutinen, S., additional, Khoo, T.-L., additional, Leino, M., additional, Moon, S., additional, Nyman, M., additional, Pakarinen, J., additional, Rahkila, P., additional, Rostron, D., additional, Sarén, J., additional, Scholey, C., additional, Sorri, J., additional, Tandel, S. K., additional, Uusitalo, J., additional, and Venhart, M., additional

Published
2008
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17. Evidence for a strongly-coupled band in very neutron-deficient odd-mass nucleus [sup 185]Pb

Author

Pakarinen, J., primary, Andreyev, A. N., additional, Antalic, S., additional, Bianco, L., additional, Darby, I. G., additional, Grahn, T., additional, Greenlees, P. T., additional, Julin, R., additional, Juutinen, S., additional, Kettunen, H., additional, Leino, M., additional, Leppänen, A.-P., additional, Nieminen, P., additional, Jenkins, D. G., additional, Jones, P., additional, Joshi, P., additional, Nyman, M., additional, Page, R. D., additional, Perkowski, J., additional, Raddon, P. M., additional, Rahkila, P., additional, Rostron, D., additional, Saren, J., additional, Scholey, C., additional, Streicher, B., additional, Sorri, J., additional, Uusitalo, J., additional, Van de Vel, K., additional, Venhart, M., additional, Wiseman, D., additional, Wadsworth, R., additional, Demetriou, P., additional, and Harissopulos, S. V., additional

Published
2008
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18. Spectroscopy of Very Heavy Elements

Author

Greenlees, P. T., primary, Herzberg, R.-D., additional, Ketelhut, S., additional, Ackermann, D., additional, Butler, P. A., additional, Chatillon, A., additional, Eeckhaudt, S., additional, Gall, B. J. P., additional, Grahn, T., additional, Gray-Jones, C., additional, Görgen, A., additional, Heβberger, F.-P., additional, Jakobsson, U., additional, Jones, G. D., additional, Jones, P., additional, Julin, R., additional, Juutinen, S., additional, Khoo, T.-L., additional, Korten, W., additional, Leino, M., additional, Moon, S., additional, Nyman, M., additional, Pakarinen, J., additional, Papadakis, P., additional, Peura, P., additional, Rahkila, P., additional, Richer, M., additional, Rostron, D., additional, Santos, C., additional, Sarén, J., additional, Scholey, C., additional, Sorri, J., additional, Tandel, S. K., additional, Theisen, Ch., additional, Uusitalo, J., additional, Venhart, M., additional, Demetriou, P., additional, and Harissopulos, S. V., additional

Published
2008
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19. Evidence for a strongly-coupled band in very neutron-deficient odd-mass nucleus Pb-185

Author

Pakarinen, J., Andreyev, A. N., Stanislav Antalic, Bianco, L., Darby, I. G., Grahn, T., Greenlees, P. T., Julin, R., Juutinen, S., Kettunen, H., Leino, M., Leppanen, A. -P, Nieminen, P., Jenkins, D. G., Jones, P., Joshi, P., Nyman, M., Page, R. D., Perkowski, J., Raddon, P. M., Rahkila, P., Rostron, D., Saren, J., Scholey, C., Streicher, B., Sorri, J., Uusitalo, J., Vel, K., Venhart, M., Wiseman, D., and Wadsworth, R.

22. Gamma-ray spectroscopy at the limits: first observation of rotational bands in 255Lr.

Author

Ketelhut S, Greenlees PT, Ackermann D, Antalic S, Clément E, Darby IG, Dorvaux O, Drouart A, Eeckhaudt S, Gall BJ, Görgen A, Grahn T, Gray-Jones C, Hauschild K, Herzberg RD, Hessberger FP, Jakobsson U, Jones GD, Jones P, Julin R, Juutinen S, Khoo TL, Korten W, Leino M, Leppänen AP, Ljungvall J, Moon S, Nyman M, Obertelli A, Pakarinen J, Parr E, Papadakis P, Peura P, Piot J, Pritchard A, Rahkila P, Rostron D, Ruotsalainen P, Sandzelius M, Sarén J, Scholey C, Sorri J, Steer A, Sulignano B, Theisen Ch, Uusitalo J, Venhart M, Zielinska M, Bender M, and Heenen PH

Abstract

The rotational band structure of 255Lr has been investigated using advanced in-beam gamma-ray spectroscopic techniques. To date, 255Lr is the heaviest nucleus to be studied in this manner. One rotational band has been unambiguously observed and strong evidence for a second rotational structure was found. The structures are tentatively assigned to be based on the 1/2-[521] and 7/2-[514] Nilsson states, consistent with assignments from recently obtained alpha decay data. The experimental rotational band dynamic moment of inertia is used to test self-consistent mean-field calculations using the Skyrme SLy4 interaction and a density-dependent pairing force.

Published
2009
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23. Production of reliability proven physiological data for use in automated monitoring and diagnostic systems.

Author

Rostron DW and Hitchings DJ

Subjects
Humans, Intensive Care Units, Models, Cardiovascular, Monitoring, Physiologic, Predictive Value of Tests, Reference Values, Reproducibility of Results, Vectorcardiography, Electrocardiography, Signal Processing, Computer-Assisted
Abstract

In recent years manufacturers of intensive care monitoring systems have introduced complex digital processing architectures that theoretically have enormous processing power. This power should allow the realization of many useful processing methodologies that up to now have only been research tools, e.g. the generation of reliable alarms, the implementation of predictive monitoring strategies and reliable diagnostic and treatment guidance to the clinical staff. However, before any of these methodologies can be successfully initiated, each must have accurate and reliable derived physiological data available to them, e.g. beat-by-beat heart rate and blood pressure. From the very nature of monitoring physiological quantities there will be much misinformation or 'noise' superimposed on the raw signal obtained from the patient. The major source of noise (as far as electrocardiogram (ECG) monitoring is concerned) is internal to the body and is electromyographic noise. This results from the contraction of skeletal muscles producing action potentials of similar magnitude and frequency to that of the ECG. Fortunately, nursing staff are very good at 'filtering out' any misinformation before recording any data (on a ward chart for instance). However, in completely automated systems, if this noise is not detected and eliminated or compensated for at an early stage in the processing chain, misinformation will result with potentially serious consequences. The recognition and elimination of such noise cannot be readily achieved using standard filtering techniques without serious degradation of information. This paper discusses the potential of modern digital system architectures developed for ECG monitoring. It analyses the noise that occurs on this physiological variable and demonstrates a novel method of eliminating such noise.

Published
1991
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