Structure of neutron-rich tungsten nuclei and evidence for a 10${}^{\ensuremath{-}}$ isomer in $^{190}\mathrm{W}$

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Structure of neutron-rich tungsten nuclei and evidence for a 10 $^{-}$ isomer in ${}^{190}W$

G. J. Lane, G. D. Dracoulis, F. G. Kondev, R. O. Hughes, H. Watanabe, A. P. Byrne, M. P. Carpenter, C. J. Chiara, P. Chowdhury, R. V. F. Janssens, T. Lauritsen, C. J. Lister, E. A. McCutchan, D. Seweryniak, I. Stefanescu, and S. Zhu

Phys. Rev. C 82, 051304(R) – Published 29 November 2010

Abstract

Isomers in the neutron-rich nucleus ${}^{190}W$ have been characterized. A $10^{-}$ state from the $9 / 2^{-} [505] \otimes 11 / 2^{+} [615]$ two-neutron configuration with a 240- $μ$ s lifetime decays via a $K$ -allowed, 97-keV, $M 2$ transition to an $8^{+}$ state with a 160-ns lifetime from the $9 / 2^{-} [505] \otimes 7 / 2^{-} [503]$ neutron configuration. New states have also been identified in ${}^{188}W$ , including a $K^{π} = 8^{-}$ , 158-ns isomer from the $9 / 2^{-} [614] \otimes 7 / 2^{+} [404]$ two-proton configuration. The $K$ hindrance is observed to decrease with increasing neutron number, consistent with a trend toward increasing triaxial softness.

Received 12 September 2010

DOI:https://doi.org/10.1103/PhysRevC.82.051304

Authors & Affiliations

G. J. Lane¹, G. D. Dracoulis¹, F. G. Kondev², R. O. Hughes¹, H. Watanabe^1,*, A. P. Byrne¹, M. P. Carpenter³, C. J. Chiara^2,3,4, P. Chowdhury⁵, R. V. F. Janssens³, T. Lauritsen³, C. J. Lister³, E. A. McCutchan³, D. Seweryniak³, I. Stefanescu^3,4, and S. Zhu³

¹Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia
²Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
³Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁴Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
⁵Department of Physics, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA

^*Present address: Nuclear Physics Research Division, RIKEN Nishina Center for Accelerator-based Science, 2-1 Hirosawa, Wako, Saitama, Japan, 351-0198.

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Vol. 82, Iss. 5 — November 2010

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Physical Review C

covering nuclear physics

Structure of neutron-rich tungsten nuclei and evidence for a 10 $^{-}$ isomer in ${}^{190}W$

G. J. Lane, G. D. Dracoulis, F. G. Kondev, R. O. Hughes, H. Watanabe, A. P. Byrne, M. P. Carpenter, C. J. Chiara, P. Chowdhury, R. V. F. Janssens, T. Lauritsen, C. J. Lister, E. A. McCutchan, D. Seweryniak, I. Stefanescu, and S. Zhu

Phys. Rev. C 82, 051304(R) – Published 29 November 2010

Abstract

Authors & Affiliations

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Physical Review C

covering nuclear physics

Structure of neutron-rich tungsten nuclei and evidence for a 10− isomer in W190

G. J. Lane, G. D. Dracoulis, F. G. Kondev, R. O. Hughes, H. Watanabe, A. P. Byrne, M. P. Carpenter, C. J. Chiara, P. Chowdhury, R. V. F. Janssens, T. Lauritsen, C. J. Lister, E. A. McCutchan, D. Seweryniak, I. Stefanescu, and S. Zhu

Phys. Rev. C 82, 051304(R) – Published 29 November 2010

Abstract

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Structure of neutron-rich tungsten nuclei and evidence for a 10 $^{-}$ isomer in ${}^{190}W$