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. 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 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.
Original languageEnglish
Article number014307
Number of pages12
JournalPhysical Review C
Volume94
Issue number1
DOIs
Publication statusPublished - 12 Jul 2016

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Parr, E., Smith, J. F., Greenlees, P. T., Smolen, M., Papadakis, P., Auranen, K., ... Uusitalo, J. (2016). Identification of the Jπ=1 state in 218Ra populated via α decay of 222Th. Physical Review C, 94(1), [014307]. https://doi.org/10.1103/PhysRevC.94.014307
Parr, Edward ; Smith, J.F. ; Greenlees, P.T. ; Smolen, Magdalena ; 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. ; Mengoni, D. ; Mistry, A.K. ; Mulholland, K.F. ; O'Neill, G.G. ; Pakarinen, J. ; Partanen, J. ; Peura, P. ; Rahkila, P. ; Ruotsalainen, P. ; Sandzelius, M. ; Sarén, J. ; Scheck, M. ; Scholey, C. ; Sorri, J. ; Stolze, S. ; Taylor, M.J. ; Uusitalo, J. / Identification of the Jπ=1 state in 218Ra populated via α decay of 222Th. In: Physical Review C. 2016 ; Vol. 94, No. 1.
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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}ň 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",
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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 Jπ=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

Identification of the Jπ=1 state in 218Ra populated via α decay of 222Th. / Parr, Edward; Smith, J.F.; Greenlees, P.T.; Smolen, Magdalena; 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.; Mengoni, D.; Mistry, A.K.; Mulholland, K.F.; O'Neill, G.G.; Pakarinen, J.; Partanen, J.; Peura, P.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Scheck, M.; Scholey, C.; Sorri, J.; Stolze, S.; Taylor, M.J.; Uusitalo, J.

In: Physical Review C, Vol. 94, No. 1, 014307, 12.07.2016.

Research output: Contribution to journalArticle

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

VL - 94

JO - Physical Review C

JF - Physical Review C

SN - 2469-9985

IS - 1

M1 - 014307

ER -