Characterization of octupole-type structures in Th 221

W. Reviol; R. V.F. Janssens; S. Frauendorf; D. G. Sarantites; M. P. Carpenter; X. Chen; C. J. Chiara; D. J. Hartley; K. Hauschild; T. Lauritsen; A. Lopez-Martens; M. Montero; O. L. Pechenaya; D. Seweryniak; J. B. Snyder; S. Zhu

doi:10.1103/PhysRevC.90.044318

Characterization of octupole-type structures in Th 221

W. Reviol, R. V.F. Janssens, S. Frauendorf, D. G. Sarantites, M. P. Carpenter, X. Chen, C. J. Chiara, D. J. Hartley, K. Hauschild, T. Lauritsen, A. Lopez-Martens, M. Montero, O. L. Pechenaya, D. Seweryniak, J. B. Snyder, S. Zhu

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Abstract

A detailed level scheme for Th221 has been established in an experiment using the O18+207Pb reaction at 96 MeV. The evaporation residues from this fissile system were selected with the HERCULES detector array and residue-gated γ rays were measured with Gammasphere. Three band structures of interlinked, alternating-parity levels are observed, two of which are non-yrast. In addition, several high-lying excitations are found. The yrast band is seen up to spin-parity 37/2- and 39/2+, beyond which a high-spin feeding transition is observed. The non-yrast sequences are interpreted as parity-doublet structures, based on a configuration similar to that of the yrast band in Th223 (K=5/2). The key properties of even-odd nuclei in this mass region [B(E1)/B(E2) and B(M1)/B(E2) ratios, spin alignments, parity splittings] are reviewed.

Original language	English
Article number	044318
Journal	Physical Review C - Nuclear Physics
Volume	90
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.90.044318
State	Published - Oct 21 2014

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Reviol, W., Janssens, R. V. F., Frauendorf, S., Sarantites, D. G., Carpenter, M. P., Chen, X., Chiara, C. J., Hartley, D. J., Hauschild, K., Lauritsen, T., Lopez-Martens, A., Montero, M., Pechenaya, O. L., Seweryniak, D., Snyder, J. B., & Zhu, S. (2014). Characterization of octupole-type structures in Th 221. Physical Review C - Nuclear Physics, 90(4), Article 044318. https://doi.org/10.1103/PhysRevC.90.044318

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title = "Characterization of octupole-type structures in Th 221",

abstract = "A detailed level scheme for Th221 has been established in an experiment using the O18+207Pb reaction at 96 MeV. The evaporation residues from this fissile system were selected with the HERCULES detector array and residue-gated γ rays were measured with Gammasphere. Three band structures of interlinked, alternating-parity levels are observed, two of which are non-yrast. In addition, several high-lying excitations are found. The yrast band is seen up to spin-parity 37/2- and 39/2+, beyond which a high-spin feeding transition is observed. The non-yrast sequences are interpreted as parity-doublet structures, based on a configuration similar to that of the yrast band in Th223 (K=5/2). The key properties of even-odd nuclei in this mass region [B(E1)/B(E2) and B(M1)/B(E2) ratios, spin alignments, parity splittings] are reviewed.",

author = "W. Reviol and Janssens, {R. V.F.} and S. Frauendorf and Sarantites, {D. G.} and Carpenter, {M. P.} and X. Chen and Chiara, {C. J.} and Hartley, {D. J.} and K. Hauschild and T. Lauritsen and A. Lopez-Martens and M. Montero and Pechenaya, {O. L.} and D. Seweryniak and Snyder, {J. B.} and S. Zhu",

note = "Publisher Copyright: {\textcopyright} 2014 American Physical Society.",

year = "2014",

month = oct,

day = "21",

doi = "10.1103/PhysRevC.90.044318",

language = "English",

volume = "90",

journal = "Physical Review C - Nuclear Physics",

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Reviol, W, Janssens, RVF, Frauendorf, S, Sarantites, DG, Carpenter, MP, Chen, X, Chiara, CJ, Hartley, DJ, Hauschild, K, Lauritsen, T, Lopez-Martens, A, Montero, M, Pechenaya, OL, Seweryniak, D, Snyder, JB & Zhu, S 2014, 'Characterization of octupole-type structures in Th 221', Physical Review C - Nuclear Physics, vol. 90, no. 4, 044318. https://doi.org/10.1103/PhysRevC.90.044318

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AU - Reviol, W.

AU - Janssens, R. V.F.

AU - Frauendorf, S.

AU - Sarantites, D. G.

AU - Carpenter, M. P.

AU - Chen, X.

AU - Chiara, C. J.

AU - Hartley, D. J.

AU - Hauschild, K.

AU - Lauritsen, T.

AU - Lopez-Martens, A.

AU - Montero, M.

AU - Pechenaya, O. L.

AU - Seweryniak, D.

AU - Snyder, J. B.

AU - Zhu, S.

PY - 2014/10/21

Y1 - 2014/10/21

N2 - A detailed level scheme for Th221 has been established in an experiment using the O18+207Pb reaction at 96 MeV. The evaporation residues from this fissile system were selected with the HERCULES detector array and residue-gated γ rays were measured with Gammasphere. Three band structures of interlinked, alternating-parity levels are observed, two of which are non-yrast. In addition, several high-lying excitations are found. The yrast band is seen up to spin-parity 37/2- and 39/2+, beyond which a high-spin feeding transition is observed. The non-yrast sequences are interpreted as parity-doublet structures, based on a configuration similar to that of the yrast band in Th223 (K=5/2). The key properties of even-odd nuclei in this mass region [B(E1)/B(E2) and B(M1)/B(E2) ratios, spin alignments, parity splittings] are reviewed.

AB - A detailed level scheme for Th221 has been established in an experiment using the O18+207Pb reaction at 96 MeV. The evaporation residues from this fissile system were selected with the HERCULES detector array and residue-gated γ rays were measured with Gammasphere. Three band structures of interlinked, alternating-parity levels are observed, two of which are non-yrast. In addition, several high-lying excitations are found. The yrast band is seen up to spin-parity 37/2- and 39/2+, beyond which a high-spin feeding transition is observed. The non-yrast sequences are interpreted as parity-doublet structures, based on a configuration similar to that of the yrast band in Th223 (K=5/2). The key properties of even-odd nuclei in this mass region [B(E1)/B(E2) and B(M1)/B(E2) ratios, spin alignments, parity splittings] are reviewed.

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DO - 10.1103/PhysRevC.90.044318

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VL - 90

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

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Characterization of octupole-type structures in Th 221

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