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; 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

doi:10.1016/j.physletb.2019.134998

Lifetime measurements of excited states in¹⁶³W 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. HerzbergE. 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

School of Computing, Engineering and Physical Sciences

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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 i_13/2 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 language	English
Article number	134998
Number of pages	5
Journal	Physics Letters B
Volume	798
Early online date	7 Oct 2019
DOIs	https://doi.org/10.1016/j.physletb.2019.134998
Publication status	Published - 10 Nov 2019

Keywords

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

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10.1016/j.physletb.2019.134998Licence: CC BY

2019 10 02 Lewis et al LifetimeProof, 706 KBLicence: CC BY

Sreenivasa Bondili
- School of Computing, Engineering and Physical Sciences - Lecturer
Person: Academic

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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., ... Uusitalo, J. (2019). Lifetime measurements of excited states in¹⁶³W and the implications for the anomalous B(E2) ratios in transitional nuclei. Physics Letters B, 798, Article 134998. https://doi.org/10.1016/j.physletb.2019.134998

@article{a8361fff0ed44b528472e7e806e7a7cb,

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}{\v n} 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 = nov,

day = "10",

doi = "10.1016/j.physletb.2019.134998",

language = "English",

volume = "798",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

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 in¹⁶³W 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

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 - 2019/11/10

Y1 - 2019/11/10

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 - Article

SN - 0370-2693

VL - 798

JO - Physics Letters B

JF - Physics Letters B

M1 - 134998

ER -

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

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Lifetime measurements of excited states in¹⁶³W and the implications for the anomalous B(E2) ratios in transitional nuclei