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

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

doi:10.1103/PhysRevC.94.014307

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

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

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Abstract

The α decay of Th222 populating the low-lying Jπ=3− state, and also a proposed 1− state, in Ra218 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.

Original language	English
Article number	014307
Journal	Physical Review C (Nuclear Physics)
Volume	94
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., Grahn, T., Grocutt, L., Herzberg, R.-D., Hodge, D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Leino, M., McPeake, C. G., Mengoni, D., ... Uusitalo, J. (2016). Identification of the J = 1− state in 218Ra populated via decay of 222Th. Physical Review C (Nuclear Physics), 94, Article 014307. https://doi.org/10.1103/PhysRevC.94.014307

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

abstract = "The α decay of Th222 populating the low-lying Jπ=3− state, and also a proposed 1− state, in Ra218 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 M. Smolen and P. Papadakis and K. Auranen and R Chapman and David Cullen and T Grahn and L. Grocutt and R-D Herzberg and D Hodge and U Jakobsson and R. Julin and S Juutinen and J Konki and M Leino and McPeake, {C. G.} and D. Mengoni and A Mistry and Mulholland, {K. F.} 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. Saren and M Scheck and C. Scholey and J. Sorri and S. Stolze and Taylor, {Michael J} and J. Uusitalo",

year = "2016",

month = jul,

day = "12",

doi = "10.1103/PhysRevC.94.014307",

language = "English",

volume = "94",

journal = "Physical Review C (Nuclear Physics)",

issn = "0556-2813",

publisher = "American Physical Society",

}

Parr, E, Smith, JF, Greenlees, PT, Smolen, M, Papadakis, P, Auranen, K, Chapman, R, Cullen, D, Grahn, T, Grocutt, L, Herzberg, R-D, Hodge, D, Jakobsson, U, Julin, R, Juutinen, S, Konki, J, Leino, M, McPeake, CG, Mengoni, D, Mistry, A, Mulholland, KF, O'Neill, GG, Pakarinen, J, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Saren, J, Scheck, M, Scholey, C, Sorri, J, Stolze, S, Taylor, MJ & Uusitalo, J 2016, 'Identification of the J = 1− state in 218Ra populated via decay of 222Th', Physical Review C (Nuclear Physics), vol. 94, 014307. https://doi.org/10.1103/PhysRevC.94.014307

TY - JOUR

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

AU - Parr, Edward

AU - Smith, J.F.

AU - Greenlees, P.T.

AU - Smolen, M.

AU - Papadakis, P.

AU - Auranen, K.

AU - Chapman, R

AU - Cullen, David

AU - Grahn, T

AU - Grocutt, L.

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. G.

AU - Mengoni, D.

AU - Mistry, A

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 - Saren, J.

AU - Scheck, M

AU - Scholey, C.

AU - Sorri, J.

AU - Stolze, S.

AU - Taylor, Michael J

AU - Uusitalo, J.

PY - 2016/7/12

Y1 - 2016/7/12

N2 - The α decay of Th222 populating the low-lying Jπ=3− state, and also a proposed 1− state, in Ra218 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 Th222 populating the low-lying Jπ=3− state, and also a proposed 1− state, in Ra218 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 - 0556-2813

VL - 94

JO - Physical Review C (Nuclear Physics)

JF - Physical Review C (Nuclear Physics)

M1 - 014307

ER -

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

Abstract

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