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73 results on '"Copnell, J."'

1. On the quadrupole collectivity in the yrast band of 168Yb

Author

Petkov, P., Dewald, A., Möller, O., Deloncle, I., Chapman, R., Pascu, S., Bucurescu, D., Tonev, D., Reese, M., Fransen, C., Araddad, S.Y., Asova, G., Copnell, J., Goutev, N., Hackstein, M., Jolie, J., Lisle, J.C., Mo, J.N., Pissulla, Th., Rother, W., Smith, A.G., Tenereiro, C., Thompson, D.M., and Zell, K.O.

Published
2017
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5. On the quadrupole collectivity in the yrast band of Yb-168

Author

Petkov, P., Dewald, A., Moller, O., Deloncle, I., Chapman, R., Pascu, S., Bucurescu, D., Tonev, D., Reese, M., Fransen, C., Araddad, S. Y., Asova, G., Copnell, J., Goutev, N., Hackstein, M., Jolie, J., Lisle, J. C., Mo, J. N., Pissulla, Th., Rother, W., Smith, A. G., Tenereiro, C., Thompson, D. M., Zell, K. O., Petkov, P., Dewald, A., Moller, O., Deloncle, I., Chapman, R., Pascu, S., Bucurescu, D., Tonev, D., Reese, M., Fransen, C., Araddad, S. Y., Asova, G., Copnell, J., Goutev, N., Hackstein, M., Jolie, J., Lisle, J. C., Mo, J. N., Pissulla, Th., Rother, W., Smith, A. G., Tenereiro, C., Thompson, D. M., and Zell, K. O.

Abstract

The lifetimes of eight lower spin levels of the yrast band in Yb-168, populated via the Sm-154(O-18,4n) and Sn-124(Ca-48,4n) reactions, were measured, six of them for the first time, by means of the recoil-distance Doppler-shift method. Two versions of the differential decay-curve method have been applied for the data analysis resulting in a very good agreement. The reduced transition probabilities indicate some reduction of the collectivity for states just above the 6(1)(+) level, i.e. well below the band-crossing. The reasons of this effect are discussed in terms of an interaction between the ground-state band and yet unknown part of the two-quasiparticle (nu(13/2)) spin-aligned S-band by invoking the shell-structure or alternatively/additionally, as changes in the internal structure/shape induced by the rotation. (C) 2016 Elsevier B.V. All rights reserved.

Published
2017

6. Magnetic dipole moments near Sn-132: Measurement on isomeric 11/2(-) states in odd-A Te-131 and Te-133 by NMR/ON

Author

White, G, Rikovska, J, Stone, NJ, Copnell, J, Towner, IS, Oros, AM, Heyde, K, Fogelberg, B, Jacobsson, L, and Gustavsson, F

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

On-line low temperature nuclear orientation (OLNO) experiments have been performed on the odd-A Te isotopes 131Te and 133Te using the technique of nuclear magnetic resonance on oriented nuclei (NMR/ON). The magnetic moments of the isomeric 11/2- states have been measured extending the known data on these states in the Te isotopes up to the neutron shell closure at N = 82. The contribution to the 11/2- magnetic moment in 133Te due to core polarisation is calculated using an RPA shell model as well as corrections to the magnetic dipole operator caused by mesonic exchange currents. The neutron number dependence of the magnetic moments of the 11/2- isomers in heavy Te isotopes is discussed in terms of particle-core coupling model (PCM) calculations. © 1998 Elsevier Science B.V.

Published
2016

7. Magnetic dipole moments near Sn-132: new measurement on I-135 by NMR/ON

Author

White, GN, Stone, NJ, Rikovska, J, Ohya, S, Copnell, J, Giles, TJ, Koh, Y, Towner, IS, Brown, BA, Fogelberg, B, Jacobsson, L, Rahkila, P, and Hjorth-Jensen, M

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

On-line low temperature nuclear orientation (OLNO) experiments have been performed on the isotope 135I using the technique of nuclear magnetic resonance on oriented nuclei (NMR/ON). The magnetic moment of the 7/2+ ground state has been measured to be μ(7/2+135I) = 2.940(2)μN, thereby extending the known data on these states in odd-A I isotopes up to the neutron shell closure at N = 82. Shell-model calculations have been performed for the magnetic moments of 7/2+ states in the N = 82 isotones using free-nucleon and effective g-factors. The effective g-factors are obtained from a perturbation calculation that includes corrections for core polarisation and meson-exchange currents. The proton number dependence of the magnetic moments in the sequence of N = 82 isotones 133Sb-139La is discussed in terms of blocking of the Og9/2 to Og7/2 core polarisation with increasing Og7/2 occupancy. Systematics of all measured 7/2+ odd-proton moments for 74 ≤ N ≤ 82 are reviewed. © 1998 Elsevier Science B.V.

Published
2016
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8. Magnetic dipole moments of isomeric 11/2- states in the odd-A isotopes 131Te and 133Te

Author

White, G., Rikowska, J., Stone, N.J., Copnell, J., Giles, T.J., Koh, Y., Towner, I.S., Brown, B.A., Fogelberg, B., Jacobsson, L., Rahkila, P., Hjort-Jensen, M., White, G., Rikowska, J., Stone, N.J., Copnell, J., Giles, T.J., Koh, Y., Towner, I.S., Brown, B.A., Fogelberg, B., Jacobsson, L., Rahkila, P., and Hjort-Jensen, M.

Published
1998

9. Magnetic dipole moments near Sn-132: Measurement on isomeric 11/2(-) states in odd-A Te-131 and Te-133 by NMR/ON

Author

White, G, Rikovska, J, Stone, NJ, Copnell, J, Towner, IS, Oros, AM, Heyde, K, Fogelberg, Birger, Jacobsson, Leif, Gustavsson, F, White, G, Rikovska, J, Stone, NJ, Copnell, J, Towner, IS, Oros, AM, Heyde, K, Fogelberg, Birger, Jacobsson, Leif, and Gustavsson, F

Abstract

On-line low temperature nuclear orientation (OLNO) experiments have been performed on the odd-A Te isotopes Te-131 and Te-133 using the technique of nuclear magnetic resonance on oriented nuclei (NMR/ON). The magnetic moments of the isomeric 11/2(-) state, Addresses: White G, Univ Oxford, Dept Phys, Parks Rd, Oxford OX1 3PU, England. Univ Oxford, Dept Phys, Oxford OX1 3PU, England. Uppsala Univ, Dept Neutron Res, S-61182 Nykoping, Sweden. Uppsala Univ, Dept Phys, Uppsala, Sweden. Univ Maryland, Dept Chem, C

Published
1998

10. Loss of alignment gain in the πh9/2[541 1/2_]x (ν i13/2)2 band in 167Tm and neighbouring odd-Z N = 98 nuclei

Author

Jensen, H.J., Bark, Robert Arthur, Bengtsson, R., Hagemann, Gudrun Bertram, Tjøm, P.O., Araddad, S.Y., Beausang, C.W., Chapman, R., Copnell, J., Fitzpatrick, A., Freeman, S.J., Leoni, S., Lisle, J.C., Simpson, J., Smith, A.G., Tompson, D.M., Warburton, S. J., Wrzesinski, J., Jensen, H.J., Bark, Robert Arthur, Bengtsson, R., Hagemann, Gudrun Bertram, Tjøm, P.O., Araddad, S.Y., Beausang, C.W., Chapman, R., Copnell, J., Fitzpatrick, A., Freeman, S.J., Leoni, S., Lisle, J.C., Simpson, J., Smith, A.G., Tompson, D.M., Warburton, S. J., and Wrzesinski, J.

Published
1997

11. Band termination spectroscopy in 157Er

Author

Gale, S.J., Simpson, J., Riley, M.A., Sharpey-Schafer, J.F., Paul, E.S., Bentley, M.A., Bruce, A.M., Chapman, R., Clark, R.M., Clarke, S., Copnell, J., Cullen, D.M., Fallon, P., Fitzpatrick, A., Forsyth, P.D., Freeman, S.J., Jones, P.M., Joyce, M.J., Liden, F., Lisle, J.C., MacChiavellio, A.O., Smith, A.G., Smith, J., Sweeney, J., Thompson, D.M., Warburton, S., Wilson, J.N., Ragnarsson, I., Gale, S.J., Simpson, J., Riley, M.A., Sharpey-Schafer, J.F., Paul, E.S., Bentley, M.A., Bruce, A.M., Chapman, R., Clark, R.M., Clarke, S., Copnell, J., Cullen, D.M., Fallon, P., Fitzpatrick, A., Forsyth, P.D., Freeman, S.J., Jones, P.M., Joyce, M.J., Liden, F., Lisle, J.C., MacChiavellio, A.O., Smith, A.G., Smith, J., Sweeney, J., Thompson, D.M., Warburton, S., Wilson, J.N., and Ragnarsson, I.

Abstract

The level scheme of 157Er has been extended from a spin region where the nucleus behaves as a prolate rotor to a region where the spin is produced by the alignment of all or most of the available valence nucleons along the symmetry axis of a weakly deformed oblate shape. The level scheme was established at high spin using up to four-fold gamma -ray coincidences detected in the Eurogam spectrometer following the reaction 114Cd(48Ca,5n)157Er at a bombarding energy of 210 MeV. Particularly favoured states have been established at IK=69/2+, 81/2+, 71/2+, 77/2-, 87-/2 and 89-/2. Specific single-particle configurations are assigned to these special states by comparison with cranked Nilsson-Strutinsky calculations. These states are related to structures observed in the neighbouring nuclei 158Er and 157Ho. These data provide the spectrum of single-particle states for the lowest lying valence orbitals above the 146Gd closed core.

Published
1995

12. Configuration-dependent transition rates in 161Tm

Author

Warburton, S. J., Chapman, R., Copnell, J., Lidén, F., Smith, A., Sweeney, J.P., Thompson, D.M., Freeman, S.J., Hagemann, Gudrun Bertram, Piiparinen, M., Warburton, S. J., Chapman, R., Copnell, J., Lidén, F., Smith, A., Sweeney, J.P., Thompson, D.M., Freeman, S.J., Hagemann, Gudrun Bertram, and Piiparinen, M.

Abstract

Fysik, ExpNP

Published
1995

13. Electromagnetic Properties of 161Tm at High Spin

Author

Smith, A., Chapmann, R., Clarke, D.C., Copnell, J., Freeman, S.J., Khazaie, F., Li, G.S., Lisle, J.S., Mo, J.N., Tenreiro, C., Thompson, D.M., Yuan, G.J., Espino, J., Hagemann, Gudrun Bertram, Smith, A., Chapmann, R., Clarke, D.C., Copnell, J., Freeman, S.J., Khazaie, F., Li, G.S., Lisle, J.S., Mo, J.N., Tenreiro, C., Thompson, D.M., Yuan, G.J., Espino, J., and Hagemann, Gudrun Bertram

Abstract

Fysik, ExpNP

Published
1995

14. Proton alignments at high rotational frequency in 167,168Yb

Author

Fitzpatrick, A., Araddad, S.Y., Chapman, R., Copnell, J., Lidén, F., Lisle, J.C., Smith, A., Sweeney, J.P., Thompson, D.M., Urban, W., Warburton, S. J., Simpson, J., Beausang, C.W., Sharpey-Schafer, J.F., Freeman, S.J., Leoni, S., Wrzesinski, J., Fitzpatrick, A., Araddad, S.Y., Chapman, R., Copnell, J., Lidén, F., Lisle, J.C., Smith, A., Sweeney, J.P., Thompson, D.M., Urban, W., Warburton, S. J., Simpson, J., Beausang, C.W., Sharpey-Schafer, J.F., Freeman, S.J., Leoni, S., and Wrzesinski, J.

Abstract

Fysik, ExpNP

Published
1995

15. Magnetic dipole moments near 132Sn: new measurement on 135I by NMR/ON

Author

White, G.N., primary, Stone, N.J., additional, Rikovska, J., additional, Ohya, S., additional, Copnell, J., additional, Giles, T.J., additional, Koh, Y., additional, Towner, I.S., additional, Brown, B.A., additional, Fogelberg, B., additional, Jacobsson, L., additional, Rahkila, P., additional, and Hjorth-Jensen, M., additional

Published
1998
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17. Loss of alignment gain in the πh 9/2[541 1/2−] ⊗ (νi 13/2)2 band in 167Tm and neighbouring odd-Z N = 98 nuclei

Author

Jensen, H. J., primary, Bark, R. A., additional, Bengtsson, R., additional, Hagemann, G. B., additional, Tjøm, P. O., additional, Araddad, S. Y., additional, Beausang, C. W., additional, Chapman, R., additional, Copnell, J., additional, Fitzpatrick, A., additional, Freeman, S. J., additional, Leoni, S., additional, Lisle, J. C., additional, Simpson, J., additional, Smith, A. G., additional, Thompson, D. M., additional, Warburton, S. J., additional, and Wrzesiński, J., additional

Published
1997
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18. Evidence for a rotational alignment in a high-Kband in

Author

Smalley, D H, primary, Smith, A G, additional, Araddad, S Y, additional, Beausang, C W, additional, Chapman, R, additional, Copnell, J, additional, Fitzpatrick, A, additional, Freeman, S J, additional, Leoni, S, additional, Lidén, F, additional, Lisle, J C, additional, Sharpey-Schafer, J F, additional, Simpson, J, additional, Sweeney, J P, additional, Thompson, D M, additional, Urban, W, additional, Warburton, S J, additional, and Wrzesinski, J, additional

Published
1996
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20. Configuration-dependent transition rates in 161Tm

Author

Warburton, S.J., primary, Chapman, R., additional, Copnell, J., additional, Lidén, F., additional, Smith, A.G., additional, Sweeney, J.P., additional, Thompson, D.M., additional, Freeman, S.J., additional, Hagemann, G.B., additional, and Piiparinen, M., additional

Published
1995
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21. Electromagnetic properties of 161Tm at high spin

Author

Smith, A.G., primary, Chapman, R., additional, Clarke, D.C., additional, Copnell, J., additional, Freeman, S.J., additional, Khazaie, F., additional, Li, G.S., additional, Lisle, J.C., additional, Mo, J.N., additional, Tenreiro, C., additional, Thompson, D.M., additional, Yuan, G.J., additional, Espino, J., additional, and Hagemann, G.B., additional

Published
1995
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23. Proton alignments at high rotational frequency in 167,168Yb

Author

Fitzpatrick, A., primary, Araddad, S.Y., additional, Chapman, R., additional, Copnell, J., additional, Lidén, F., additional, Lisle, J.C., additional, Smith, A.G., additional, Sweeney, J.P., additional, Thompson, D.M., additional, Urban, W., additional, Warburton, S.J., additional, Simpson, J., additional, Beausang, C.W., additional, Sharpey-Schafer, J.F., additional, Freeman, S.J., additional, Leoni, S., additional, and Wrzesinski, J., additional

Published
1995
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24. Single particle excitations and properties of multiple band terminations near spin 50ħ in 158Er

Author

Simpson, J., primary, Riley, M.A., additional, Gale, S.J., additional, Sharpey-Schafer, J.F., additional, Bentley, M.A., additional, Bruce, A.M., additional, Chapman, R., additional, Clark, R.M., additional, Clarke, S., additional, Copnell, J., additional, Cullen, D.M., additional, Fallon, P., additional, Fitzpatrick, A., additional, Forsyth, P.D., additional, Freeman, S.J., additional, Jones, P.M., additional, Joyce, M.J., additional, Liden, F., additional, Lisle, J.C., additional, Macchiavelli, A.O., additional, Smith, A.G., additional, Smith, J.F., additional, Sweeney, J., additional, Thompson, D.M., additional, Warburton, S., additional, Wilson, J.N., additional, Bengtsson, T., additional, and Ragnarsson, I., additional

Published
1994
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26. NewN=84 isotone:Te136

Author

Cizewski, J. A., primary, Hotchkis, M. A. C., additional, Durell, J. L., additional, Copnell, J., additional, Mowbray, A. S., additional, Fitzgerald, J., additional, Phillips, W. R., additional, Ahmad, I., additional, Carpenter, M. P., additional, Janssens, R. V. F., additional, Khoo, T. L., additional, Moore, E. F., additional, Morss, L. R., additional, Benet, Ph., additional, and Ye, D., additional

Published
1993
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32. Some aspects of theCd111level scheme

Author

Vesković, M., primary, Bikit, I., additional, Aniin, I., additional, Hamilton, W. D., additional, Copnell, J., additional, Krmar, M., additional, and Slivka, J., additional

Published
1990
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33. Loss of alignment gain in the πh9/2[541 1/2−] ⊗ (νi13/2)2 band in 167Tm and neighbouring odd-Z N = 98 nuclei.

Author

Jensen, H. J., Bark, R. A., Bengtsson, R., Hagemann, G. B., Tjøm, P. O., Araddad, S. Y., Beausang, C. W., Chapman, R., Copnell, J., Fitzpatrick, A., Freeman, S. J., Leoni, S., Lisle, J. C., Simpson, J., Smith, A. G., Thompson, D. M., Warburton, S. J., and Wrzesiński, J.

Abstract

Theπh9/2[541 1/2−] band in 167Tm has been studied through the 124Sn(48Ca, p4n)167Tm reaction at Ebeam = 210 MeV. The favoured signature of the πh9/2[541 1/2−] band is observed to spin 61/2h̅. A remarkable small gain in aligned angular momentum at the AB-band crossing has been found. The crossing frequency and the gain in aligned angular momentum for 167Tm are compared with data for the N = 98 isotones of Lu, Ta and Re, and contrasted with Cranked Shell Model predictions, based on frequency diabatic configurations. Large deviations are found for the gain in aligned angular momentum. [ABSTRACT FROM AUTHOR]

Published
1997
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36. Levels of138Xe populated in the β-decay of138I

Author

Copnell, J., Robinson, S. J., Lippert, W., and Rabbel, V.

Abstract

The level scheme of138Xe has been elucidated by?-? directional correlations and coincidences followingß-decay of138I. The138I was produced by the neutron induced fission of235U, in the online thermal fissionproduct mass-separator, OSTIS.

Published
1992
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37. Loss of alignment gain in the πh9/2[541 1/2−] ⊗ (νi13/2)2band in 167Tm and neighbouring odd-Z N= 98 nuclei

Author

Jensen, H. J., Bark, R. A., Bengtsson, R., Hagemann, G. B., Tjøm, P. O., Araddad, S. Y., Beausang, C. W., Chapman, R., Copnell, J., Fitzpatrick, A., Freeman, S. J., Leoni, S., Lisle, J. C., Simpson, J., Smith, A. G., Thompson, D. M., Warburton, S. J., and Wrzesiński, J.

Abstract

Theπh9/2[541 1/2−] band in 167Tm has been studied through the 124Sn(48Ca, p4n)167Tm reaction at Ebeam= 210 MeV. The favoured signature of the πh9/2[541 1/2−] band is observed to spin 61/2h̅. A remarkable small gain in aligned angular momentum at the AB-band crossing has been found. The crossing frequency and the gain in aligned angular momentum for 167Tm are compared with data for the N= 98 isotones of Lu, Ta and Re, and contrasted with Cranked Shell Model predictions, based on frequency diabatic configurations. Large deviations are found for the gain in aligned angular momentum.

Published
1997
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39. SINGLE-PARTICLE EXCITATIONS AND PROPERTIES OF MULTIPLE BAND TERMINATIONS NEAR SPIN 50H IN ER-158

Author

Simpson, J., Riley, M. A., Gale, S. J., Sharpeyschafer, J., Bentley, M. A., Bruce, A. M., Chapman, R., Clark, R. M., Clarke, S., Copnell, J., Cullen, D. M., Fallon, P., Fitzpatrick, A., Forsyth, P. D., Sean Freeman, Jones, P. M., Joyce, M. J., Liden, F., Lisle, J. C., Macchiavelli, A. O., Gavin Smith, Smith, J. F., Sweeney, J., Thompson, D. M., Warburton, S., Wilson, J. N., Bengtsson, T., and Ragnarsson, T.

42. Evidence for a rotational alignment in a high-K band in Yb-167

Author

Smalley, Dh, Smith, Ag, Araddad, Sy, Beausang, Cw, Chapman, R., Copnell, J., Fitzpatrick, A., Sean Freeman, Leoni, S., Liden, F., Lisle, Jc, Sharpeyschafer, Jf, Simpson, J., Sweeney, Jp, Thompson, Dm, Urban, W., Warburton, Sj, and Wrzesinski, J.

43. PROTON ALIGNMENTS AT HIGH ROTATIONAL FREQUENCY IN YB-167,YB-168

Author

Fitzpatrick, A., Araddad, S. Y., Chapman, R., Copnell, J., Liden, F., Lisle, J. C., Gavin Smith, Sweeney, J. P., Thompson, D. M., Urban, W., Warburton, S. J., Simpson, J., Beausang, C. W., Sharpeyschafer, J. F., Sean Freeman, Leoni, S., and Wrzesinski, J.

46. Evidence for a rotational alignment in a high- K band in.

Author

Smalley, D. H., Smith, A. G., Araddad, S. Y., Beausang, C. W., Chapman, R., Copnell, J., Fitzpatrick, A., Freeman, S. J., Leoni, S., Lidén, F., Lisle, J. C., Sharpey-Schafer, J. F., Simpson, J., Sweeney, J. P., Thompson, D. M., Urban, W., Warburton, S. J., and Wrzesinski, J.

Published
1996
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47. Band termination spectroscopy in 157Er.

Author

Gale, S. J., Simpson, J., Riley, M. A., Sharpey-Schafer, J. F., Paul, E. S., Bentley, M. A., Bruce, A. M., Chapman, R., Clark, R. M., Clarke, S., Copnell, J., Cullen, D. M., Fallon, P., Fitzpatrick, A., Forsyth, P. D., Freeman, S. J., Jones, P. M., Joyce, M. J., Liden, F., and Lisle, J. C.

Published
1995
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