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31 results on '"Ødegård, S. W."'

1. Microcanonical entropies and radiative strength functions of $^{50,51}$V

Author

Larsen, A. C., Chankova, R., Guttormsen, M., Ingebretsen, F., Lönnroth, T., Messelt, S., Rekstad, J., Schiller, A., Siem, S., Syed, N. U. H., Voinov, A., and Ødegård, S. W.

Subjects
Nuclear Experiment
Abstract

The level densities and radiative strength functions (RSFs) of $^{50,51}$V have been extracted using the ($^3$He,$\alpha \gamma$) and ($^3$He,$^3$He$^{\prime} \gamma$) reactions, respectively. From the level densities, microcanonical entropies are deduced. The high $\gamma$-energy part of the RSF is described by the giant electric dipole resonance. A significant enhancement over the predicted strength in the region of $E_{\gamma} \lesssim 3$ MeV is seen, which at present has no theoretical explanation., Comment: 16 pages including 9 figures

Published
2005
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2. Critical temperature for quenching of pair correlations

Author

Schiller, A., Bjerve, A., Guttormsen, M., Hjorth-Jensen, M., Ingebretsen, F., Melby, E., Messelt, S., Rekstad, J., Siem, S., and Odegard, S. W.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The level density at low spin in the 161,162-Dy and 171,172-Yb nuclei has been extracted from primary gamma rays. The nuclear heat capacity is deduced within the framework of the canonical ensemble. The heat capacity exhibits an S-formed shape as a function of temperature, which is interpreted as a fingerprint of the phase transition from a strongly correlated to an uncorrelated phase. The critical temperature for the quenching of pair correlations is found at Tc=0.50(4) MeV., Comment: 8 pages including 4 figures, different method to extract Tc, different figures, text partly rewritten

Published
1999
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3. Observation of Thermodynamical Properties in the $^{162}$Dy, $^{166}$Er and $^{172}$Yb Nuclei

Author

Melby, E., Bergholt, L., Guttormsen, M., Hjorth-Jensen, M., Ingebretsen, F., Messelt, S., Rekstad, J., Schiller, A., Siem, S., and Ødegård, S. W.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The density of accessible levels in the ($^3$He,$\alpha \gamma$) reaction has been extracted for the $^{162}$Dy, $^{166}$Er and $^{172}$Yb nuclei. The nuclear temperature is measured as a function of excitation energy in the region of 0 -- 6 MeV. The temperature curves reveal structures indicating new degrees of freedom. The heat capacity of the nuclear system is discussed within the framework of a canonical ensemble., Comment: 12 pages, 4 figures included

Published
1999
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4. Enhanced E1-Decay from Triaxial SD Bands in 164Lu

Author

Ødegård, S. W., Hagemann, G. B., Törmänen, S., Tjøm, P. O., Harsmann, A., Bergström, M., Bark, R. A., Herskind, B., Sletten, G., Görgen, A., Hübel, H., Aengenvoort, B., van Severen, U., Ur, C., Jensen, H. J., Napoli, D., Lenzi, S., Petrache, C., Fahlander, C., Ryde, H., Bracco, A., Frattini, S., Chapman, R., Cullen, D. M., King, S. L., Smit, F. D., editor, Lindsay, R., editor, and Förtsch, S. V., editor

Published
1999
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6. High-spin studies of164Lu using EUROBALL

Author

Törmänen, S., Hagemann, G. B., Harsmann, A., Bergström, M., Bark, R. A., Herskind, B., Sletten, G., Ødegård, S. W., Tjøm, P. O., Görgen, A., Hübel, H., Aengenvoort, B., Severen, U. J. Van, Ryde, H., Fahlander, C., Napoli, D., Lenzi, S., Petrache, C., Ur, C., Jensen, H. J., Bracco, A., Frattini, S., Chapman, R., Cullen, D. M., and King, S. L.

Published
1998
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7. Enhanced E1-Decay from Triaxial SD Bands in 164Lu

Author

Ødegård, S. W., primary, Hagemann, G. B., additional, Törmänen, S., additional, Tjøm, P. O., additional, Harsmann, A., additional, Bergström, M., additional, Bark, R. A., additional, Herskind, B., additional, Sletten, G., additional, Görgen, A., additional, Hübel, H., additional, Aengenvoort, B., additional, van Severen, U., additional, Ur, C., additional, Jensen, H. J., additional, Napoli, D., additional, Lenzi, S., additional, Petrache, C., additional, Fahlander, C., additional, Ryde, H., additional, Bracco, A., additional, Frattini, S., additional, Chapman, R., additional, Cullen, D. M., additional, and King, S. L., additional

Published
2000
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9. Evidence for octupole vibration in the triaxial superdeformed well of 164 Lu

Author

Bringel, P., Engelhardt, C., Hübel, H., Neusser-Neffgen, A., Ødegård, S. W., Hagemann, Gudrun Bertram, Hansen, C. R., Herskind, B., Sletten, Geirr, Carpenter, M. P., Janssens, R. V. F., khoo, T. L., Lauritsen, T., Seweryniak, D., Ma, W. C., Roux, D. G., Chowdhury, P., Bringel, P., Engelhardt, C., Hübel, H., Neusser-Neffgen, A., Ødegård, S. W., Hagemann, Gudrun Bertram, Hansen, C. R., Herskind, B., Sletten, Geirr, Carpenter, M. P., Janssens, R. V. F., khoo, T. L., Lauritsen, T., Seweryniak, D., Ma, W. C., Roux, D. G., and Chowdhury, P.

Abstract

Udgivelsesdato: Apr.

Published
2007

10. Band structuers extending to very high spin in 126Xe

Author

Rønne Hansen, C., Sletten, Geirr, Hagemann, Gudrun Bertram, Jensen, D. R., Bringel, P., Engelhardt, C., Hübel, H., Neusser-Neffgen, A., Singh, A. K., Carpenter, M. P., Janssens, R.V. F., Khoo, T. L., Lauritsen, T., Bednarczyk, P., Byrski, T., Curien, P., Benzoni, G., Bracco, A., Camera, F., Leoni, S., Clark, R. M., Korichi, A., Roccaz, J., Maj, A., Wilson, J. N., Lisle, J. C., Steinhardt, T., Thelen, O., Ødegård, S. W., Rønne Hansen, C., Sletten, Geirr, Hagemann, Gudrun Bertram, Jensen, D. R., Bringel, P., Engelhardt, C., Hübel, H., Neusser-Neffgen, A., Singh, A. K., Carpenter, M. P., Janssens, R.V. F., Khoo, T. L., Lauritsen, T., Bednarczyk, P., Byrski, T., Curien, P., Benzoni, G., Bracco, A., Camera, F., Leoni, S., Clark, R. M., Korichi, A., Roccaz, J., Maj, A., Wilson, J. N., Lisle, J. C., Steinhardt, T., Thelen, O., and Ødegård, S. W.

Published
2007

11. 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

12. Band structures extending to very high spin inXe126

Author

Rønn Hansen, C., primary, Sletten, G., additional, Hagemann, G. B., additional, Herskind, B., additional, Jensen, D. R., additional, Bringel, P., additional, Engelhardt, C., additional, Hübel, H., additional, Neußer-Neffgen, A., additional, Singh, A. K., additional, Carpenter, M. P., additional, Janssens, R. V. F., additional, Khoo, T. L., additional, Lauritsen, T., additional, Bednarczyk, P., additional, Byrski, T., additional, Curien, D., additional, Benzoni, G., additional, Bracco, A., additional, Camera, F., additional, Leoni, S., additional, Clark, R. M., additional, Fallon, P., additional, Korichi, A., additional, Roccaz, J., additional, Maj, A., additional, Wilson, J. N., additional, Lisle, J. C., additional, Steinhardt, T., additional, Thelen, O., additional, and Ødegård, S. W., additional

Published
2007
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13. Evidence for octupole vibration in the triaxial superdeformed well ofLu164

Author

Bringel, P., primary, Engelhardt, C., additional, Hübel, H., additional, Neußer-Neffgen, A., additional, Ødegård, S. W., additional, Hagemann, G. B., additional, Hansen, C. R., additional, Herskind, B., additional, Sletten, G., additional, Carpenter, M. P., additional, Janssens, R. V. F., additional, Khoo, T. L., additional, Lauritsen, T., additional, Seweryniak, D., additional, Ma, W. C., additional, Roux, D. G., additional, and Chowdhury, P., additional

Published
2007
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14. Microcanonical entropies and radiative strength functions ofV50,51

Author

Larsen, A. C., primary, Chankova, R., additional, Guttormsen, M., additional, Ingebretsen, F., additional, Messelt, S., additional, Rekstad, J., additional, Siem, S., additional, Syed, N. U. H., additional, Ødegård, S. W., additional, Lönnroth, T., additional, Schiller, A., additional, and Voinov, A., additional

Published
2006
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15. In-beam electron spectroscopy ofU226andNo254

Author

Humphreys, R. D., primary, Butler, P. A., additional, Bastin, J. E., additional, Greenlees, P. T., additional, Hammond, N. J., additional, Herzberg, R.-D., additional, Jenkins, D. G., additional, Jones, G. D., additional, Kankaanpää, H., additional, Keenan, A., additional, Kettunen, H., additional, Page, T., additional, Rahkila, P., additional, Scholey, C., additional, Uusitalo, J., additional, Amzal, N., additional, Brew, P. M.T., additional, Eskola, K., additional, Gerl, J., additional, Hauschild, K., additional, Helariutta, K., additional, Heßberger, F.-P., additional, Hürstel, A., additional, Jones, P. M., additional, Julin, R., additional, Juutinen, S., additional, Khoo, T.-L., additional, Korten, W., additional, Kuusiniemi, P., additional, Le Coz, Y., additional, Leino, M., additional, Leppänen, A.-P., additional, Muikku, M., additional, Nieminen, P., additional, Ødegård, S. W., additional, Pakarinen, J., additional, Reiter, P., additional, Sletten, G., additional, Theisen, Ch., additional, and Wollersheim, H.-J., additional

Published
2004
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16. Conversion Electron Cascades inN102254o

Author

Butler, P. A., primary, Humphreys, R. D., additional, Greenlees, P. T., additional, Herzberg, R.-D., additional, Jenkins, D. G., additional, Jones, G. D., additional, Kankaanpää, H., additional, Kettunen, H., additional, Rahkila, P., additional, Scholey, C., additional, Uusitalo, J., additional, Amzal, N., additional, Bastin, J. E., additional, Brew, P. M. T., additional, Eskola, K., additional, Gerl, J., additional, Hammond, N. J., additional, Hauschild, K., additional, Helariutta, K., additional, Heßberger, F.-P., additional, Hürstel, A., additional, Jones, P. M., additional, Julin, R., additional, Juutinen, S., additional, Keenan, A., additional, Khoo, T.-L., additional, Korten, W., additional, Kuusiniemi, P., additional, Le Coz, Y., additional, Leino, M., additional, Leppänen, A.-P., additional, Muikku, M., additional, Nieminen, P., additional, Ødegård, S. W., additional, Page, T., additional, Pakarinen, J., additional, Reiter, P., additional, Sletten, G., additional, Theisen, Ch., additional, and Wollersheim, H.-J., additional

Published
2002
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17. Evidence for Second-Phonon Nuclear Wobbling

Author

Jensen, D. R., primary, Hagemann, G. B., additional, Hamamoto, I., additional, Ødegård, S. W., additional, Herskind, B., additional, Sletten, G., additional, Wilson, J. N., additional, Spohr, K., additional, Hübel, H., additional, Bringel, P., additional, Neußer, A., additional, Schönwaßer, G., additional, Singh, A. K., additional, Ma, W. C., additional, Amro, H., additional, Bracco, A., additional, Leoni, S., additional, Benzoni, G., additional, Maj, A., additional, Petrache, C. M., additional, Bianco, G. Lo, additional, Bednarczyk, P., additional, and Curien, D., additional

Published
2002
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18. Heating Nuclei in the Mass Region of A ∼ 40 – 50.

Author

Sunde, A. C., Guttormsen, M., Chankova, R., Ingebretsen, F., Lönnroth, T., Messelt, S., Rekstad, J., Schiller, A., Siem, S., Syed, N. U. H., Voinov, A., and Ødegård, S. W.

Subjects
NUCLEAR energy, NUCLEAR physics, ENTROPY, PHYSICS, DIPOLE moments
Abstract

The nuclear level densities of 44,45Sc and 50,51V have been measured using the Oslo method. From the level density thermal properties such as entropy and temperature are deduced. Also the radiative strength functions (RSF) of 50,51V have been extracted. The gross properties of the RSF are generally described by the low-energetic tail of the giant electric dipole resonance (GEDR). At γ energies below ∼ 3 MeV, the RSFs show an unexpected enhancement. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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19. SEARCH FOR THE WOBBLING MODE BUILT ON TRIAXIAL SUPER DEFORMED BANDS

Author

ØDEGÅRD, S. W., primary, HAGEMANN, G. B., additional, BERGSTRÖM, M., additional, HERSKIND, B., additional, JENSEN, D. R., additional, SLETTEN, G., additional, TÖRMÄNEN, S., additional, WILSON, J., additional, TJØM, P. O., additional, HÜBEL, H., additional, GÖRGEN, A., additional, SCHÖNWASSER, G., additional, BRACCO, A., additional, LEONI, S., additional, MAJ, A., additional, PETRACHE, C., additional, BEDNARCZYK, P., additional, and CURIEN, D., additional

Published
2001
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20. Evidence for the Wobbling Mode in Nuclei

Author

Ødegård, S. W., primary, Hagemann, G. B., additional, Jensen, D. R., additional, Bergström, M., additional, Herskind, B., additional, Sletten, G., additional, Törmänen, S., additional, Wilson, J. N., additional, Tjøm, P. O., additional, Hamamoto, I., additional, Spohr, K., additional, Hübel, H., additional, Görgen, A., additional, Schönwasser, G., additional, Bracco, A., additional, Leoni, S., additional, Maj, A., additional, Petrache, C. M., additional, Bednarczyk, P., additional, and Curien, D., additional

Published
2001
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21. Critical temperature for quenching of pair correlations

Author

Schiller, A., primary, Bjerve, A., additional, Guttormsen, M., additional, Hjorth-Jensen, M., additional, Ingebretsen, F., additional, Melby, E., additional, Messelt, S., additional, Rekstad, J., additional, Siem, S., additional, and Ødegård, S. W., additional

Published
2001
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23. Intruder bands extended inRe175andIr177: Deformation changes and interaction at the alignment ofi13/2neutrons

Author

Bark, R. A., primary, Ødegård, S. W., additional, Bengtsson, R., additional, Bearden, I. G., additional, Hagemann, G. B., additional, Herskind, B., additional, Ingebretsen, F., additional, Leoni, S., additional, Ryde, H., additional, Shizuma, T., additional, Strähle, K., additional, Tjøm, P. O., additional, and Wrzesinski, J., additional

Published
1995
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24. RADIATIVE STRENGTH FUNCTIONS OF WARM NUCLEI IN THE 1f7/2 SHELL.

Author

Larsen, A. C., Guttormsen, M., Chankova, R., Ingebretsen, F., Lönnroth, T., Messelt, S., Ødegård, S. W., Rekstad, J., Siem, S., Syed, N. U. H., Schiller, A., and Voinov, A.

Subjects
DENSITY, DIPOLE moments, RESONANCE, ANALOG resonance, PHYSICAL & theoretical chemistry
Abstract

The level densities of 50,51V and 44,45Sc have been extracted using the (³He,αγ) and (³He,³He'γ) reactions, respectively. Also the radiative strength functions of 50,51V will be presented. The high -energy part of the measured strength functions fits well with the tail of the giant electric dipole resonance. A significant enhancement over the predicted strength in the region of Eγ ≤ 3 MeV is observed. This feature is, at present, without any theoretical explanation. [ABSTRACT FROM AUTHOR]

Published
2007

25. Coexisting wobbling and quasiparticle excitations in the triaxial potential well of 163Lu.

Author

Jensen, D. R., Hagemann, G. B., Hamamoto, I., Herskind, B., Sletten, G., Wilson, J. N., Ødegård, S. W., Spohr, K., Hübel, H., Bringel, P., Neuβer, A., Schönwaβer, G., Singh, A. K., Ma, W. C., Amro, H., Bracco, A., Leoni, S., Benzoni, G., Maj, A., and Petrache, C. M.

Subjects
QUASIPARTICLES, PARTICLES (Nuclear physics), QUANTUM theory, EVAPORATION (Chemistry), MOISTURE, PHYSICS
Abstract

High-spin states of the nucleus 163Lu have been populated through the fusion-evaporation reaction 139La(29Si, 5n) with a beam energy of 157 MeV. In addition to the two lowest excited triaxial strongly deformed (TSD) bands, recently interpreted as one- and two-phonon wobbling excitations, a third excited TSD band has been firmly established decaying to the yrast TSD band. The assignment of this band as a three-quasiparticle band shows together with the normal deformed (ND) level scheme the presence not only of shape coexistence between ND and TSD structures, but also an interplay of wobbling and quasiparticle excitations in the triaxial strongly deformed potential well of 163Lu. [ABSTRACT FROM AUTHOR]

Published
2004
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26. Extracting Experimental Level Densities in A ∼ 207 – 208 Nuclei.

Author

Syed, Naeem-Ul-Hasan, Guttormsen, M., Siem, S., Ingebretsen, F., Lönnroth, T., Rekstad, J., Schiller, A., Sunde, A. C., Chankova, R., and Ødegård, S. W.

Subjects
NUCLEAR energy, NUCLEAR physics, PHYSICS, PHYSICAL sciences, NUCLEAR excitation
Abstract

The energy dependent nuclear level densities of 205–208Pb nuclei below the nuclear binding energies were determined by using the Oslo method. The experimental primary γ-ray per excitation energy bin have been extracted for scattering and transfer reactions. The Axel-Brink hypothesis was then used to separate out level density and γ-strength function from the primary γ spectra. The influence of closed shells is quite obvious in the measured level densities. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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27. Conversion electron cascades in 102254NO

Author

Butler, P. A., Humphreys, R. D., Greenlees, P. T., Herzberg, R. -D, Jenkins, D. G., Jones, G. D., Kankaanpää, H., Kettunen, H., Rahkila, P., Scholey, C., Uusitalo, J., Amzal, N., Bastin, J. E., Brew, P. M. T., Eskola, K., Gerl, J., Hammond, N. J., Hauschild, K., Helariutta, K., Heßberger, F. -P, Hürstel, A., Jones, P. M., Julin, R., Juutinen, S., Keenan, A., Khoo, T. -L, Korten, W., Kuusiniemi, P., Le Coz, Y., Leino, M., Leppänen, A. -P, Muikku, M., Nieminen, P., Ødegård, S. W., Page, T., Pakarinen, J., Reiter, P., Sletten, G., Christophe THEISEN, and Wollersheim, H. -J

28. Conversion electron cascades in 102254NO

Author

Butler, P. A., Humphreys, R. D., Greenlees, P. T., Herzberg, R. -D, Jenkins, D. G., Jones, G. D., Kankaanpää, H., Kettunen, H., Rahkila, P., Scholey, C., Uusitalo, J., Amzal, N., Bastin, J. E., Brew, P. M. T., Eskola, K., Gerl, J., Hammond, N. J., Hauschild, K., Helariutta, K., Heßberger, F. -P, Hürstel, A., Jones, P. M., Julin, R., Juutinen, S., Keenan, A., Khoo, T. -L, Korten, W., Kuusiniemi, P., Le Coz, Y., Leino, M., Leppänen, A. -P, Muikku, M., Nieminen, P., Ødegård, S. W., Page, T., Janne Pakarinen, Reiter, P., Sletten, G., Theisen, C., and Wollersheim, H. -J

29. First evidence for the wobbling mode in a triaxial superdeformed odd-A nucleus

Author

Hamamoto, I., Ødegård, S. W., Hagemann, G. B., Jensen, D. R., Bergström, M., Herskind, B., Sletten, G., Törmänen, S., Wilson, J. N., Tjøm, P. O., Spohr, K., Hübel, H., Andreas Görgen, Schönwasser, G., Bracco, A., Leoni, S., Maj, A., Petrache, C. M., Bednarczyrß, P., Curien, D., Heyd, Yvette, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

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

30. High-spin studies of164Lu using EUROBALL

Author

Törmänen, S., Hagemann, G. B., Harsmann, A., Bergström, M., Bark, R. A., Herskind, B., Sletten, G., Ødegård, S. W., Tjøm, P. O., Görgen, A., Hübel, H., Aengenvoort, B., Severen, U. J., Ryde, H., Fahlander, C., Daniel R. Napoli, Lenzi, S., Petrache, C., Ur, C., Jensen, H. J., Bracco, A., Frattini, S., Chapman, R., Cullen, D. M., and King, S. L.

31. Coexisting normal and triaxial superdeformed structures in 165Lu.

Author

Schönwaßer, G., Nenoff, N., Hübel, H., Hagemann, G. B., Bednarczyk, P., Benzoni, G., Bracco, A., Bringel, P., Chapman, R., Curien, D., Domscheit, J., Herskind, B., Jensen, D. R., Leoni, S., Lo Bianco, G., Ma, W. C., Maj, A., Neußer, A., Ødegård, S. W., and Petrache, C. M.

Subjects
*GAMMA rays, *SPECTRUM analysis, *SPECTROMETERS, *PHONONS
Abstract

High-spin states in 165Lu were populated in the 139La(30Si,4n) reaction at a beam energy of 152 MeV and γ-ray coincidences were measured with the EUROBALL spectrometer array. Nine new rotational bands were discovered, known band structures were considerably extended and many inter-band transitions were found. Structures with normal deformation coexist with bands associated with the strongly deformed triaxial energy minima found in calculations. Three of these triaxial bands form a family of wobbling excitations with phonon quanta nw=0, 1 and 2. The wobbling mode is a unique signature of nuclear triaxiality. Configuration assignments are discussed for the observed band structures. An exchange of configuration between two of the new bands due to mixing is observed, resulting in different signature partnerships at low and high spins. [Copyright &y& Elsevier]

Published
2004
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