Recoil-decay tagging spectroscopy of W-162(74)88

H.J. Li; B. Cederwall; T. Back; C. Qi; M. Doncel; U. Jakobsson; K. Auranen; S. Bönig; M.C. Drummond; T. Grahn; P. Greenlees; A. Herzáň; 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.92.014326

Recoil-decay tagging spectroscopy of W-162(74)88

H.J. Li, B. Cederwall, T. Back, C. Qi, M. Doncel, U. Jakobsson, K. Auranen, S. Bönig, M.C. Drummond, T. Grahn, P. Greenlees, A. Herzáň, R. Julin, S. Juutinen, J. Konki, T. Kröll, M. Leino, C. McPeake, D. O'Donnell, R.D. PageJ. 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

Excited states in the highly neutron-deficient nucleus 162W have been investigated via the 92Mo(78Kr,2α)162W reaction. Prompt γ rays were detected by the JUROGAM II high-purity germanium detector array and the recoiling fusion-evaporation products were separated by the recoil ion transport unit (RITU) gas-filled recoil separator and identified with the gamma recoil electron alpha tagging (GREAT) spectrometer at the focal plane of RITU. γ rays from 162W were identified uniquely using mother-daughter and mother-daughter-granddaughter α-decay correlations. The observation of a rotational-like ground-state band is interpreted within the framework of total Routhian surface (TRS) calculations, which suggest an axially symmetric ground-state shape with a γ-soft minimum at β2≈0.15. Quasiparticle alignment effects are discussed based on cranked shell model calculations. New measurements of the
162W ground-state α-decay energy and half-life were also performed. The observed α-decay energy agrees with previous measurements. The half-life of 162W was determined to be t1/2=990(30) ms. This value deviates significantly from the currently adopted value of t1/2=1360(70) ms. In addition, the α-decay energy and half-life of 166Os were measured and found to agree with the adopted values.

Original language	English
Article number	014326
Journal	Physical Review C
Volume	92
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.92.014326
Publication status	Published - 2015
Externally published	Yes

Keywords

gamma-ray spectroscopy
total data readout
sape coexistence
nuclei
detectors
region
GE

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10.1103/PhysRevC.92.014326

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Li, H. J., Cederwall, B., Back, T., Qi, C., Doncel, M., Jakobsson, U., Auranen, K., Bönig, S., Drummond, M. C., Grahn, T., Greenlees, P., Herzáň, A., Julin, R., Juutinen, S., Konki, J., Kröll, T., Leino, M., McPeake, C., O'Donnell, D., ... Xiao, Z. G. (2015). Recoil-decay tagging spectroscopy of W-162(74)88. Physical Review C, 92(1), Article 014326 . https://doi.org/10.1103/PhysRevC.92.014326

@article{3ff53d399136409ab00d91775594da40,

title = "Recoil-decay tagging spectroscopy of W-162(74)88",

abstract = "Excited states in the highly neutron-deficient nucleus 162W have been investigated via the 92Mo(78Kr,2α)162W reaction. Prompt γ rays were detected by the JUROGAM II high-purity germanium detector array and the recoiling fusion-evaporation products were separated by the recoil ion transport unit (RITU) gas-filled recoil separator and identified with the gamma recoil electron alpha tagging (GREAT) spectrometer at the focal plane of RITU. γ rays from 162W were identified uniquely using mother-daughter and mother-daughter-granddaughter α-decay correlations. The observation of a rotational-like ground-state band is interpreted within the framework of total Routhian surface (TRS) calculations, which suggest an axially symmetric ground-state shape with a γ-soft minimum at β2≈0.15. Quasiparticle alignment effects are discussed based on cranked shell model calculations. New measurements of the 162W ground-state α-decay energy and half-life were also performed. The observed α-decay energy agrees with previous measurements. The half-life of 162W was determined to be t1/2=990(30) ms. This value deviates significantly from the currently adopted value of t1/2=1360(70) ms. In addition, the α-decay energy and half-life of 166Os were measured and found to agree with the adopted values.",

keywords = "gamma-ray spectroscopy, total data readout, sape coexistence, nuclei, detectors, region, GE",

author = "H.J. Li and B. Cederwall and T. Back and C. Qi and M. Doncel and U. Jakobsson and K. Auranen and S. B{\"o}nig and M.C. Drummond and T. Grahn and P. Greenlees and A. Herz{\'a}{\v n} 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 = "2015",

doi = "10.1103/PhysRevC.92.014326",

language = "English",

volume = "92",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "1",

}

Li, HJ, Cederwall, B, Back, T, Qi, C, Doncel, M, Jakobsson, U, Auranen, K, Bönig, S, Drummond, MC, Grahn, T, Greenlees, P, Herzáň, A, 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 2015, 'Recoil-decay tagging spectroscopy of W-162(74)88', Physical Review C, vol. 92, no. 1, 014326 . https://doi.org/10.1103/PhysRevC.92.014326

TY - JOUR

T1 - Recoil-decay tagging spectroscopy of W-162(74)88

AU - Li, H.J.

AU - Cederwall, B.

AU - Back, T.

AU - Qi, C.

AU - Doncel, M.

AU - Jakobsson, U.

AU - Auranen, K.

AU - Bönig, S.

AU - Drummond, M.C.

AU - Grahn, T.

AU - Greenlees, P.

AU - Herzáň, A.

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 - 2015

Y1 - 2015

N2 - Excited states in the highly neutron-deficient nucleus 162W have been investigated via the 92Mo(78Kr,2α)162W reaction. Prompt γ rays were detected by the JUROGAM II high-purity germanium detector array and the recoiling fusion-evaporation products were separated by the recoil ion transport unit (RITU) gas-filled recoil separator and identified with the gamma recoil electron alpha tagging (GREAT) spectrometer at the focal plane of RITU. γ rays from 162W were identified uniquely using mother-daughter and mother-daughter-granddaughter α-decay correlations. The observation of a rotational-like ground-state band is interpreted within the framework of total Routhian surface (TRS) calculations, which suggest an axially symmetric ground-state shape with a γ-soft minimum at β2≈0.15. Quasiparticle alignment effects are discussed based on cranked shell model calculations. New measurements of the 162W ground-state α-decay energy and half-life were also performed. The observed α-decay energy agrees with previous measurements. The half-life of 162W was determined to be t1/2=990(30) ms. This value deviates significantly from the currently adopted value of t1/2=1360(70) ms. In addition, the α-decay energy and half-life of 166Os were measured and found to agree with the adopted values.

AB - Excited states in the highly neutron-deficient nucleus 162W have been investigated via the 92Mo(78Kr,2α)162W reaction. Prompt γ rays were detected by the JUROGAM II high-purity germanium detector array and the recoiling fusion-evaporation products were separated by the recoil ion transport unit (RITU) gas-filled recoil separator and identified with the gamma recoil electron alpha tagging (GREAT) spectrometer at the focal plane of RITU. γ rays from 162W were identified uniquely using mother-daughter and mother-daughter-granddaughter α-decay correlations. The observation of a rotational-like ground-state band is interpreted within the framework of total Routhian surface (TRS) calculations, which suggest an axially symmetric ground-state shape with a γ-soft minimum at β2≈0.15. Quasiparticle alignment effects are discussed based on cranked shell model calculations. New measurements of the 162W ground-state α-decay energy and half-life were also performed. The observed α-decay energy agrees with previous measurements. The half-life of 162W was determined to be t1/2=990(30) ms. This value deviates significantly from the currently adopted value of t1/2=1360(70) ms. In addition, the α-decay energy and half-life of 166Os were measured and found to agree with the adopted values.

KW - gamma-ray spectroscopy

KW - total data readout

KW - sape coexistence

KW - nuclei

KW - detectors

KW - region

KW - GE

U2 - 10.1103/PhysRevC.92.014326

DO - 10.1103/PhysRevC.92.014326

M3 - Article

SN - 2469-9985

VL - 92

JO - Physical Review C

JF - Physical Review C

IS - 1

M1 - 014326

ER -

Recoil-decay tagging spectroscopy of W-162(74)88

Abstract

Keywords

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