Lifetime measurements of excited states in 163W and the implications for the anomalous B(E2) ratios in transitional nuclei

M.C. Lewis, D.T. Joss*, B. Saygi, R.D. Page, D.M. Cullen, L. Barber, M.M. Giles, J. Simpson, M.A.M. Al-Aqeel, H. Badran, T. Braunroth, A.D. Briscoe, T. Calverley, A. Dewald, M. Doncel, T. Grahn, P.T. Greenlees, C. Henrich, A. Herzáň, R.-D. Herzberg & 23 others E. Higgins, J. Hilton, S. Ilieva, R. Julin, S. Juutinen, J. Keatings, T. Kröll, Marc Labiche, K. Mashtakov, B.S. Nara Singh, E. Parr, J. Partanen, E.S. Paul, P. Rahkila, M. Sandzelius, J. Saren, C. Scholey, M. Siciliano, P. Spagnoletti, S. Stolze, S.V. Szwec, M.J. Taylor, J. Uusitalo

*Corresponding author for this work

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Abstract

This letter reports lifetime measurements of excited states in the odd-N nucleus 163W using the recoil-distance Doppler shift method to probe the core polarising effect of the i13/2 neutron orbital on the underlying soft triaxial even-even core. The ratio B(E2:21/2+→ 17/2+)/B(E2:17/2+ → 13/2+) is consistent with the predictions of the collective rotational model. The deduced B(E2) values provide insights into the validity of collective model predictions for heavy transitional nuclei and a geometric origin for the anomalous B(E2) ratios observed in nearby even-even nuclei is proposed.
Original languageEnglish
Article number134998
Number of pages5
JournalPhysics Letters B
Volume798
Early online date7 Oct 2019
DOIs
Publication statusE-pub ahead of print - 7 Oct 2019

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life (durability)
even-even nuclei
nuclei
heavy nuclei
predictions
excitation
neutrons
orbitals
probes
shift

Keywords

  • Mean lifetimes
  • B(E2) reduced transition probabilities
  • Recoil-distance Doppler-shift method
  • Nuclear deformation
  • Gamma-ray Spectroscopy

Cite this

Lewis, M.C. ; Joss, D.T. ; Saygi, B. ; Page, R.D. ; Cullen, D.M. ; Barber, L. ; Giles, M.M. ; Simpson, J. ; Al-Aqeel, M.A.M. ; Badran, H. ; Braunroth, T. ; Briscoe, A.D. ; Calverley, T. ; Dewald, A. ; Doncel, M. ; Grahn, T. ; Greenlees, P.T. ; Henrich, C. ; Herzáň, A. ; Herzberg, R.-D. ; Higgins, E. ; Hilton, J. ; Ilieva, S. ; Julin, R. ; Juutinen, S. ; Keatings, J. ; Kröll, T. ; Labiche, Marc ; Mashtakov, K. ; Nara Singh, B.S. ; Parr, E. ; Partanen, J. ; Paul, E.S. ; Rahkila, P. ; Sandzelius, M. ; Saren, J. ; Scholey, C. ; Siciliano, M. ; Spagnoletti, P. ; Stolze, S. ; Szwec, S.V. ; Taylor, M.J. ; Uusitalo, J. / Lifetime measurements of excited states in 163W and the implications for the anomalous B(E2) ratios in transitional nuclei. In: Physics Letters B. 2019 ; Vol. 798.
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title = "Lifetime measurements of excited states in 163W and the implications for the anomalous B(E2) ratios in transitional nuclei",
abstract = "This letter reports lifetime measurements of excited states in the odd-N nucleus 163W using the recoil-distance Doppler shift method to probe the core polarising effect of the i13/2 neutron orbital on the underlying soft triaxial even-even core. The ratio B(E2:21/2+→ 17/2+)/B(E2:17/2+ → 13/2+) is consistent with the predictions of the collective rotational model. The deduced B(E2) values provide insights into the validity of collective model predictions for heavy transitional nuclei and a geometric origin for the anomalous B(E2) ratios observed in nearby even-even nuclei is proposed.",
keywords = "Mean lifetimes, B(E2) reduced transition probabilities, Recoil-distance Doppler-shift method, Nuclear deformation, Gamma-ray Spectroscopy",
author = "M.C. Lewis and D.T. Joss and B. Saygi and R.D. Page and D.M. Cullen and L. Barber and M.M. Giles and J. Simpson and M.A.M. Al-Aqeel and H. Badran and T. Braunroth and A.D. Briscoe and T. Calverley and A. Dewald and M. Doncel and T. Grahn and P.T. Greenlees and C. Henrich and A. Herz{\'a}ň and R.-D. Herzberg and E. Higgins and J. Hilton and S. Ilieva and R. Julin and S. Juutinen and J. Keatings and T. Kr{\"o}ll and Marc Labiche and K. Mashtakov and {Nara Singh}, B.S. and E. Parr and J. Partanen and E.S. Paul and P. Rahkila and M. Sandzelius and J. Saren and C. Scholey and M. Siciliano and P. Spagnoletti and S. Stolze and S.V. Szwec and M.J. Taylor and J. Uusitalo",
year = "2019",
month = "10",
day = "7",
doi = "10.1016/j.physletb.2019.134998",
language = "English",
volume = "798",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier B.V.",

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Lewis, MC, Joss, DT, Saygi, B, Page, RD, Cullen, DM, Barber, L, Giles, MM, Simpson, J, Al-Aqeel, MAM, Badran, H, Braunroth, T, Briscoe, AD, Calverley, T, Dewald, A, Doncel, M, Grahn, T, Greenlees, PT, Henrich, C, Herzáň, A, Herzberg, R-D, Higgins, E, Hilton, J, Ilieva, S, Julin, R, Juutinen, S, Keatings, J, Kröll, T, Labiche, M, Mashtakov, K, Nara Singh, BS, Parr, E, Partanen, J, Paul, ES, Rahkila, P, Sandzelius, M, Saren, J, Scholey, C, Siciliano, M, Spagnoletti, P, Stolze, S, Szwec, SV, Taylor, MJ & Uusitalo, J 2019, 'Lifetime measurements of excited states in 163W and the implications for the anomalous B(E2) ratios in transitional nuclei', Physics Letters B, vol. 798, 134998. https://doi.org/10.1016/j.physletb.2019.134998

Lifetime measurements of excited states in 163W and the implications for the anomalous B(E2) ratios in transitional nuclei. / Lewis, M.C.; Joss, D.T.; Saygi, B.; Page, R.D.; Cullen, D.M.; Barber, L.; Giles, M.M.; Simpson, J.; Al-Aqeel, M.A.M.; Badran, H.; Braunroth, T.; Briscoe, A.D.; Calverley, T.; Dewald, A.; Doncel, M.; Grahn, T.; Greenlees, P.T.; Henrich, C.; Herzáň, A.; Herzberg, R.-D.; Higgins, E.; Hilton, J.; Ilieva, S.; Julin, R.; Juutinen, S.; Keatings, J.; Kröll, T.; Labiche, Marc ; Mashtakov, K.; Nara Singh, B.S.; Parr, E.; Partanen, J.; Paul, E.S.; Rahkila, P.; Sandzelius, M.; Saren, J.; Scholey, C.; Siciliano, M.; Spagnoletti, P.; Stolze, S.; Szwec, S.V.; Taylor, M.J.; Uusitalo, J.

In: Physics Letters B, Vol. 798, 134998, 07.10.2019.

Research output: Contribution to journalLetter

TY - JOUR

T1 - Lifetime measurements of excited states in 163W and the implications for the anomalous B(E2) ratios in transitional nuclei

AU - Lewis, M.C.

AU - Joss, D.T.

AU - Saygi, B.

AU - Page, R.D.

AU - Cullen, D.M.

AU - Barber, L.

AU - Giles, M.M.

AU - Simpson, J.

AU - Al-Aqeel, M.A.M.

AU - Badran, H.

AU - Braunroth, T.

AU - Briscoe, A.D.

AU - Calverley, T.

AU - Dewald, A.

AU - Doncel, M.

AU - Grahn, T.

AU - Greenlees, P.T.

AU - Henrich, C.

AU - Herzáň, A.

AU - Herzberg, R.-D.

AU - Higgins, E.

AU - Hilton, J.

AU - Ilieva, S.

AU - Julin, R.

AU - Juutinen, S.

AU - Keatings, J.

AU - Kröll, T.

AU - Labiche, Marc

AU - Mashtakov, K.

AU - Nara Singh, B.S.

AU - Parr, E.

AU - Partanen, J.

AU - Paul, E.S.

AU - Rahkila, P.

AU - Sandzelius, M.

AU - Saren, J.

AU - Scholey, C.

AU - Siciliano, M.

AU - Spagnoletti, P.

AU - Stolze, S.

AU - Szwec, S.V.

AU - Taylor, M.J.

AU - Uusitalo, J.

PY - 2019/10/7

Y1 - 2019/10/7

N2 - This letter reports lifetime measurements of excited states in the odd-N nucleus 163W using the recoil-distance Doppler shift method to probe the core polarising effect of the i13/2 neutron orbital on the underlying soft triaxial even-even core. The ratio B(E2:21/2+→ 17/2+)/B(E2:17/2+ → 13/2+) is consistent with the predictions of the collective rotational model. The deduced B(E2) values provide insights into the validity of collective model predictions for heavy transitional nuclei and a geometric origin for the anomalous B(E2) ratios observed in nearby even-even nuclei is proposed.

AB - This letter reports lifetime measurements of excited states in the odd-N nucleus 163W using the recoil-distance Doppler shift method to probe the core polarising effect of the i13/2 neutron orbital on the underlying soft triaxial even-even core. The ratio B(E2:21/2+→ 17/2+)/B(E2:17/2+ → 13/2+) is consistent with the predictions of the collective rotational model. The deduced B(E2) values provide insights into the validity of collective model predictions for heavy transitional nuclei and a geometric origin for the anomalous B(E2) ratios observed in nearby even-even nuclei is proposed.

KW - Mean lifetimes

KW - B(E2) reduced transition probabilities

KW - Recoil-distance Doppler-shift method

KW - Nuclear deformation

KW - Gamma-ray Spectroscopy

U2 - 10.1016/j.physletb.2019.134998

DO - 10.1016/j.physletb.2019.134998

M3 - Letter

VL - 798

JO - Physics Letters B

JF - Physics Letters B

SN - 0370-2693

M1 - 134998

ER -