Identification of the Jπ=1− state in 218Ra populated via α decay of 222Th

Edward Parr; J.F. Smith; P.T. Greenlees; Magdalena Smolen; P. Papadakis; K. Auranen; R. Chapman; D.M. Cullen; T. Grahn; L. Grocutt; A. Herzáň; R.-D. Herzberg; D. Hodge; U. Jakobsson; R. Julin; S. Juutinen; J. Konki; M. Leino; C. McPeake; D. Mengoni; A.K. Mistry; K.F. Mulholland; G.G. O'Neill; J. Pakarinen; J. Partanen; P. Peura; P. Rahkila; P. Ruotsalainen; M. Sandzelius; J. Sarén; M. Scheck; C. Scholey; J. Sorri; S. Stolze; M.J. Taylor; J. Uusitalo

doi:10.1103/PhysRevC.94.014307

Identification of the J^π=1⁻ state in ²¹⁸Ra populated via α decay of ²²²Th

Edward Parr, J.F. Smith, P.T. Greenlees, Magdalena Smolen, P. Papadakis, K. Auranen, R. Chapman, D.M. Cullen, T. Grahn, L. Grocutt, A. Herzáň, R.-D. Herzberg, D. Hodge, U. Jakobsson, R. Julin, S. Juutinen, J. Konki, M. Leino, C. McPeake, D. MengoniA.K. Mistry, K.F. Mulholland, G.G. O'Neill, J. Pakarinen, J. Partanen, P. Peura, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, M. Scheck, C. Scholey, J. Sorri, S. Stolze, M.J. Taylor, J. Uusitalo

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Abstract

The α decay of ²²²Th populating the low-lying J^π=3⁻ state, and also a proposed 1⁻ state, in ²¹⁸Ra has been observed. The observations suggest an excitation energy of 853 keV for the 1⁻ state, which is 60 keV above the 3⁻ state. The hindrance factors of these α decays give a possible boundary to the region of ground-state octupole deformation in the light-actinide nuclei. The relative positions of the J^π=1⁻ and 3⁻ states suggest they are produced by an octupole-vibrational mechanism, as opposed to α clustering or rotations of a reflection-asymmetric octupole-deformed shape.

Original language	English
Article number	014307
Number of pages	12
Journal	Physical Review C
Volume	94
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.94.014307
Publication status	Published - 12 Jul 2016

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Parr, E., Smith, J. F., Greenlees, P. T., Smolen, M., Papadakis, P., Auranen, K., Chapman, R., Cullen, D. M., Grahn, T., Grocutt, L., Herzáň, A., Herzberg, R.-D., Hodge, D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., McPeake, C., ... Uusitalo, J. (2016). Identification of the J^π=1⁻ state in ²¹⁸Ra populated via α decay of ²²²Th. Physical Review C, 94(1), Article 014307. https://doi.org/10.1103/PhysRevC.94.014307

@article{f16f7963ced9483ea04be93246ede3e6,

title = "Identification of the Jπ=1− state in 218Ra populated via α decay of 222Th",

abstract = "The α decay of 222Th populating the low-lying Jπ=3− state, and also a proposed 1− state, in 218Ra has been observed. The observations suggest an excitation energy of 853 keV for the 1− state, which is 60 keV above the 3− state. The hindrance factors of these α decays give a possible boundary to the region of ground-state octupole deformation in the light-actinide nuclei. The relative positions of the Jπ=1− and 3− states suggest they are produced by an octupole-vibrational mechanism, as opposed to α clustering or rotations of a reflection-asymmetric octupole-deformed shape.",

author = "Edward Parr and J.F. Smith and P.T. Greenlees and Magdalena Smolen and P. Papadakis and K. Auranen and R. Chapman and D.M. Cullen and T. Grahn and L. Grocutt and A. Herz{\'a}{\v n} and R.-D. Herzberg and D. Hodge and U. Jakobsson and R. Julin and S. Juutinen and J. Konki and M. Leino and C. McPeake and D. Mengoni and A.K. Mistry and K.F. Mulholland and G.G. O'Neill and J. Pakarinen and J. Partanen and P. Peura and P. Rahkila and P. Ruotsalainen and M. Sandzelius and J. Sar{\'e}n and M. Scheck and C. Scholey and J. Sorri and S. Stolze and M.J. Taylor and J. Uusitalo",

year = "2016",

month = jul,

day = "12",

doi = "10.1103/PhysRevC.94.014307",

language = "English",

volume = "94",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "1",

}

Parr, E, Smith, JF, Greenlees, PT, Smolen, M, Papadakis, P, Auranen, K, Chapman, R, Cullen, DM, Grahn, T, Grocutt, L, Herzáň, A, Herzberg, R-D, Hodge, D, Jakobsson, U, Julin, R, Juutinen, S, Konki, J, Leino, M, McPeake, C, Mengoni, D, Mistry, AK, Mulholland, KF, O'Neill, GG, Pakarinen, J, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Sarén, J, Scheck, M, Scholey, C, Sorri, J, Stolze, S, Taylor, MJ & Uusitalo, J 2016, 'Identification of the J^π=1⁻ state in ²¹⁸Ra populated via α decay of ²²²Th', Physical Review C, vol. 94, no. 1, 014307. https://doi.org/10.1103/PhysRevC.94.014307

TY - JOUR

T1 - Identification of the Jπ=1− state in 218Ra populated via α decay of 222Th

AU - Parr, Edward

AU - Smith, J.F.

AU - Greenlees, P.T.

AU - Smolen, Magdalena

AU - Papadakis, P.

AU - Auranen, K.

AU - Chapman, R.

AU - Cullen, D.M.

AU - Grahn, T.

AU - Grocutt, L.

AU - Herzáň, A.

AU - Herzberg, R.-D.

AU - Hodge, D.

AU - Jakobsson, U.

AU - Julin, R.

AU - Juutinen, S.

AU - Konki, J.

AU - Leino, M.

AU - McPeake, C.

AU - Mengoni, D.

AU - Mistry, A.K.

AU - Mulholland, K.F.

AU - O'Neill, G.G.

AU - Pakarinen, J.

AU - Partanen, J.

AU - Peura, P.

AU - Rahkila, P.

AU - Ruotsalainen, P.

AU - Sandzelius, M.

AU - Sarén, J.

AU - Scheck, M.

AU - Scholey, C.

AU - Sorri, J.

AU - Stolze, S.

AU - Taylor, M.J.

AU - Uusitalo, J.

PY - 2016/7/12

Y1 - 2016/7/12

N2 - The α decay of 222Th populating the low-lying Jπ=3− state, and also a proposed 1− state, in 218Ra has been observed. The observations suggest an excitation energy of 853 keV for the 1− state, which is 60 keV above the 3− state. The hindrance factors of these α decays give a possible boundary to the region of ground-state octupole deformation in the light-actinide nuclei. The relative positions of the Jπ=1− and 3− states suggest they are produced by an octupole-vibrational mechanism, as opposed to α clustering or rotations of a reflection-asymmetric octupole-deformed shape.

AB - The α decay of 222Th populating the low-lying Jπ=3− state, and also a proposed 1− state, in 218Ra has been observed. The observations suggest an excitation energy of 853 keV for the 1− state, which is 60 keV above the 3− state. The hindrance factors of these α decays give a possible boundary to the region of ground-state octupole deformation in the light-actinide nuclei. The relative positions of the Jπ=1− and 3− states suggest they are produced by an octupole-vibrational mechanism, as opposed to α clustering or rotations of a reflection-asymmetric octupole-deformed shape.

U2 - 10.1103/PhysRevC.94.014307

DO - 10.1103/PhysRevC.94.014307

M3 - Article

SN - 2469-9985

VL - 94

JO - Physical Review C

JF - Physical Review C

IS - 1

M1 - 014307

ER -

Identification of the Jπ=1− state in 218Ra populated via α decay of 222Th

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Identification of the J^π=1⁻ state in ²¹⁸Ra populated via α decay of ²²²Th