Lifetime measurements in Re-166: collective versus magnetic rotation

H.J. Li; B. Cederwall; M. Doncel; J. Peng; Q.B. Chen; S.Q. Zhang; P.W. Zhao; J. Meng; T. Bäck; U. Jakobsson; K. Auranen; S. Bönig; M. Drummond; T. Grahn; P. Greenlees; A. Herzáň; D.T. Joss; R. Julin; S. Juutinen; J. Konki; T. Kröll; M. Leino; C. McPeake; D. O'Donnell; R.D. Page; J. Pakarinen; J. Partanen; P. Peura; P. Rahkila; P. Ruotsalainen; M. Sandzelius; J. Sarén; B. Sayğı; C. Scholey; J. Sorri; S. Stolze; M.J. Taylor; A. Thornthwaite; J. Uusitalo; Z.G. Xiao

doi:10.1103/PhysRevC.93.034309

Lifetime measurements in Re-166: collective versus magnetic rotation

H.J. Li, B. Cederwall, M. Doncel, J. Peng, Q.B. Chen, S.Q. Zhang, P.W. Zhao, J. Meng, T. Bäck, U. Jakobsson, K. Auranen, S. Bönig, M. Drummond, T. Grahn, P. Greenlees, A. Herzáň, D.T. Joss, R. Julin, S. Juutinen, J. KonkiT. Kröll, M. Leino, C. McPeake, D. O'Donnell, R.D. Page, J. Pakarinen, J. Partanen, P. Peura, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, B. Sayğı, C. Scholey, J. Sorri, S. Stolze, M.J. Taylor, A. Thornthwaite, J. Uusitalo, Z.G. Xiao

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Abstract

Lifetimes of excited states in the neutron-deficient odd-odd nucleus Re-166 have been measured for the first time using the recoil distance Doppler-shift method. The measured lifetime for the (8(-)) state; tau = 480 (80) ps, enabled an assessment of the multipolarities of the gamma rays depopulating this state. Information on electromagnetic transition strengths were deduced for the gamma-ray transitions from the (9(-)), (10(-)), and (11(-)) states, and in the case of the (10(-)) and (11(-)) states limits on the B (M1) and B(E2) strengths were estimated. The results are compared with total Routhian surface predictions and semiclassical calculations. Tilted-axis cranking calculations based on a relativistic mean-field approach (TAC-RMF) have also been performed in order to test the possibility of magnetic rotation in the 166Re nucleus. While the TAC-RMF calculations predict a quadrupole-deformed nuclear shape with similar beta(2) deformation as obtained by using the TRS model, it was found that the experimental electromagnetic transition rates are in better agreement with a collective -rotational description.

Original language	English
Article number	034309
Journal	Physical Review C
Volume	93
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.93.034309
Publication status	Published - 8 Mar 2016
Externally published	Yes

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Li, H. J., Cederwall, B., Doncel, M., Peng, J., Chen, Q. B., Zhang, S. Q., Zhao, P. W., Meng, J., Bäck, T., Jakobsson, U., Auranen, K., Bönig, S., Drummond, M., Grahn, T., Greenlees, P., Herzáň, A., Joss, D. T., Julin, R., Juutinen, S., ... Xiao, Z. G. (2016). Lifetime measurements in Re-166: collective versus magnetic rotation. Physical Review C, 93(3), Article 034309. https://doi.org/10.1103/PhysRevC.93.034309

@article{227a2baa4800455a8feec2842b96324f,

title = "Lifetime measurements in Re-166: collective versus magnetic rotation",

abstract = "Lifetimes of excited states in the neutron-deficient odd-odd nucleus Re-166 have been measured for the first time using the recoil distance Doppler-shift method. The measured lifetime for the (8(-)) state; tau = 480 (80) ps, enabled an assessment of the multipolarities of the gamma rays depopulating this state. Information on electromagnetic transition strengths were deduced for the gamma-ray transitions from the (9(-)), (10(-)), and (11(-)) states, and in the case of the (10(-)) and (11(-)) states limits on the B (M1) and B(E2) strengths were estimated. The results are compared with total Routhian surface predictions and semiclassical calculations. Tilted-axis cranking calculations based on a relativistic mean-field approach (TAC-RMF) have also been performed in order to test the possibility of magnetic rotation in the 166Re nucleus. While the TAC-RMF calculations predict a quadrupole-deformed nuclear shape with similar beta(2) deformation as obtained by using the TRS model, it was found that the experimental electromagnetic transition rates are in better agreement with a collective -rotational description.",

author = "H.J. Li and B. Cederwall and M. Doncel and J. Peng and Q.B. Chen and S.Q. Zhang and P.W. Zhao and J. Meng and T. B{\"a}ck and U. Jakobsson and K. Auranen and S. B{\"o}nig and M. Drummond and T. Grahn and P. Greenlees and A. Herz{\'a}{\v n} and D.T. Joss and R. Julin and S. Juutinen and J. Konki and T. Kr{\"o}ll and M. Leino and C. McPeake and D. O'Donnell and R.D. Page and J. Pakarinen and J. Partanen and P. Peura and P. Rahkila and P. Ruotsalainen and M. Sandzelius and J. Sar{\'e}n and B. Sayğı and C. Scholey and J. Sorri and S. Stolze and M.J. Taylor and A. Thornthwaite and J. Uusitalo and Z.G. Xiao",

year = "2016",

month = mar,

day = "8",

doi = "10.1103/PhysRevC.93.034309",

language = "English",

volume = "93",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "3",

}

Li, HJ, Cederwall, B, Doncel, M, Peng, J, Chen, QB, Zhang, SQ, Zhao, PW, Meng, J, Bäck, T, Jakobsson, U, Auranen, K, Bönig, S, Drummond, M, Grahn, T, Greenlees, P, Herzáň, A, Joss, DT, Julin, R, Juutinen, S, Konki, J, Kröll, T, Leino, M, McPeake, C, O'Donnell, D, Page, RD, Pakarinen, J, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Sarén, J, Sayğı, B, Scholey, C, Sorri, J, Stolze, S, Taylor, MJ, Thornthwaite, A, Uusitalo, J & Xiao, ZG 2016, 'Lifetime measurements in Re-166: collective versus magnetic rotation', Physical Review C, vol. 93, no. 3, 034309. https://doi.org/10.1103/PhysRevC.93.034309

TY - JOUR

T1 - Lifetime measurements in Re-166

T2 - collective versus magnetic rotation

AU - Li, H.J.

AU - Cederwall, B.

AU - Doncel, M.

AU - Peng, J.

AU - Chen, Q.B.

AU - Zhang, S.Q.

AU - Zhao, P.W.

AU - Meng, J.

AU - Bäck, T.

AU - Jakobsson, U.

AU - Auranen, K.

AU - Bönig, S.

AU - Drummond, M.

AU - Grahn, T.

AU - Greenlees, P.

AU - Herzáň, A.

AU - Joss, D.T.

AU - Julin, R.

AU - Juutinen, S.

AU - Konki, J.

AU - Kröll, T.

AU - Leino, M.

AU - McPeake, C.

AU - O'Donnell, D.

AU - Page, R.D.

AU - Pakarinen, J.

AU - Partanen, J.

AU - Peura, P.

AU - Rahkila, P.

AU - Ruotsalainen, P.

AU - Sandzelius, M.

AU - Sarén, J.

AU - Sayğı, B.

AU - Scholey, C.

AU - Sorri, J.

AU - Stolze, S.

AU - Taylor, M.J.

AU - Thornthwaite, A.

AU - Uusitalo, J.

AU - Xiao, Z.G.

PY - 2016/3/8

Y1 - 2016/3/8

N2 - Lifetimes of excited states in the neutron-deficient odd-odd nucleus Re-166 have been measured for the first time using the recoil distance Doppler-shift method. The measured lifetime for the (8(-)) state; tau = 480 (80) ps, enabled an assessment of the multipolarities of the gamma rays depopulating this state. Information on electromagnetic transition strengths were deduced for the gamma-ray transitions from the (9(-)), (10(-)), and (11(-)) states, and in the case of the (10(-)) and (11(-)) states limits on the B (M1) and B(E2) strengths were estimated. The results are compared with total Routhian surface predictions and semiclassical calculations. Tilted-axis cranking calculations based on a relativistic mean-field approach (TAC-RMF) have also been performed in order to test the possibility of magnetic rotation in the 166Re nucleus. While the TAC-RMF calculations predict a quadrupole-deformed nuclear shape with similar beta(2) deformation as obtained by using the TRS model, it was found that the experimental electromagnetic transition rates are in better agreement with a collective -rotational description.

AB - Lifetimes of excited states in the neutron-deficient odd-odd nucleus Re-166 have been measured for the first time using the recoil distance Doppler-shift method. The measured lifetime for the (8(-)) state; tau = 480 (80) ps, enabled an assessment of the multipolarities of the gamma rays depopulating this state. Information on electromagnetic transition strengths were deduced for the gamma-ray transitions from the (9(-)), (10(-)), and (11(-)) states, and in the case of the (10(-)) and (11(-)) states limits on the B (M1) and B(E2) strengths were estimated. The results are compared with total Routhian surface predictions and semiclassical calculations. Tilted-axis cranking calculations based on a relativistic mean-field approach (TAC-RMF) have also been performed in order to test the possibility of magnetic rotation in the 166Re nucleus. While the TAC-RMF calculations predict a quadrupole-deformed nuclear shape with similar beta(2) deformation as obtained by using the TRS model, it was found that the experimental electromagnetic transition rates are in better agreement with a collective -rotational description.

U2 - 10.1103/PhysRevC.93.034309

DO - 10.1103/PhysRevC.93.034309

M3 - Article

SN - 2469-9985

VL - 93

JO - Physical Review C

JF - Physical Review C

IS - 3

M1 - 034309

ER -

Lifetime measurements in Re-166: collective versus magnetic rotation

Abstract

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