Excited states in 217Ra populated in the α decay of 221Th

E. Parr; J. F. Smith; P. T. Greenlees; 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; C. McPeake; D. Mengoni; A. K. Mistry; K. F. Mulholland; G. G. O'Neill; J. Pakarinen; P. Papadakis; J. Partanen; P. Peura; P. Rahkila; P. Ruotsalainen; M. Sandzelius; J. Saren; M. Scheck; C. Scholey; M. Siciliano; M. Smolen; J. Sorri; S. Stolze; M. J. Taylor; J. Uusitalo

doi:10.1103/PhysRevC.102.054335

Excited states in ²¹⁷Ra populated in the α decay of ²²¹Th

E. Parr^*, J. F. Smith, P. T. Greenlees, 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, C. McPeake, D. Mengoni, A. K. Mistry, K. F. Mulholland, G. G. O'NeillJ. Pakarinen, P. Papadakis, J. Partanen, P. Peura, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Saren, M. Scheck, C. Scholey, M. Siciliano, M. Smolen, J. Sorri, S. Stolze, M. J. Taylor, J. Uusitalo

^*Corresponding author for this work

School of Computing, Engineering and Physical Sciences

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Abstract

Fine structure in the α decay of ²²¹₉₀Th, populating excited states in ²¹⁷₈₈Ra, was studied using αγ-coincidence spectroscopy. Two α-decay branches from ²²¹Th have been newly observed, with E_α(keV)[b_α(%)]=7951(8)[0.14(3)] and 8247(3)[1.51(12)], together with three previously known branches. Also, two new states in ²¹⁷Ra were identified at E = 177 and 227 keV. The ground-state configurations of the odd-A, N = 131 transitional isotones above ²⁰⁸Pb are interpreted from their α-decay fine structure systematics and considered in terms of predictions using spherical shell and reflection-asymmetric models.

Original language	English
Article number	054335
Journal	Physical Review C
Volume	102
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.102.054335
Publication status	Published - 30 Nov 2020

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2020 11 10 Parr et al Excited acceptedAccepted author manuscript, 1.38 MB

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Parr, E., Smith, J. F., Greenlees, P. T., 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., McPeake, C., Mengoni, D., Mistry, A. K., Mulholland, K. F., ... Uusitalo, J. (2020). Excited states in ²¹⁷Ra populated in the α decay of ²²¹Th. Physical Review C, 102(5), Article 054335. https://doi.org/10.1103/PhysRevC.102.054335

@article{a268a518dca24643b6fd466abc7ca820,

title = "Excited states in 217Ra populated in the α decay of 221Th",

abstract = "Fine structure in the α decay of 22190Th, populating excited states in 21788Ra, was studied using αγ-coincidence spectroscopy. Two α-decay branches from 221Th have been newly observed, with Eα(keV)[bα(%)]=7951(8)[0.14(3)] and 8247(3)[1.51(12)], together with three previously known branches. Also, two new states in 217Ra were identified at E = 177 and 227 keV. The ground-state configurations of the odd-A, N = 131 transitional isotones above 208Pb are interpreted from their α-decay fine structure systematics and considered in terms of predictions using spherical shell and reflection-asymmetric models.",

author = "E. Parr and Smith, {J. F.} and Greenlees, {P. T.} and K. Auranen and R. Chapman and Cullen, {D. M.} 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 C. McPeake and D. Mengoni and Mistry, {A. K.} and Mulholland, {K. F.} and O'Neill, {G. G.} and J. Pakarinen and P. Papadakis 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 M. Siciliano and M. Smolen and J. Sorri and S. Stolze and Taylor, {M. J.} and J. Uusitalo",

note = "cited By 0",

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Parr, E, Smith, JF, Greenlees, PT, 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, McPeake, C, Mengoni, D, Mistry, AK, Mulholland, KF, O'Neill, GG, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Saren, J, Scheck, M, Scholey, C, Siciliano, M, Smolen, M, Sorri, J, Stolze, S, Taylor, MJ & Uusitalo, J 2020, 'Excited states in ²¹⁷Ra populated in the α decay of ²²¹Th', Physical Review C, vol. 102, no. 5, 054335. https://doi.org/10.1103/PhysRevC.102.054335

TY - JOUR

T1 - Excited states in 217Ra populated in the α decay of 221Th

AU - Parr, E.

AU - Smith, J. F.

AU - Greenlees, P. T.

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 - McPeake, C.

AU - Mengoni, D.

AU - Mistry, A. K.

AU - Mulholland, K. F.

AU - O'Neill, G. G.

AU - Pakarinen, J.

AU - Papadakis, P.

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 - Siciliano, M.

AU - Smolen, M.

AU - Sorri, J.

AU - Stolze, S.

AU - Taylor, M. J.

AU - Uusitalo, J.

N1 - cited By 0

PY - 2020/11/30

Y1 - 2020/11/30

N2 - Fine structure in the α decay of 22190Th, populating excited states in 21788Ra, was studied using αγ-coincidence spectroscopy. Two α-decay branches from 221Th have been newly observed, with Eα(keV)[bα(%)]=7951(8)[0.14(3)] and 8247(3)[1.51(12)], together with three previously known branches. Also, two new states in 217Ra were identified at E = 177 and 227 keV. The ground-state configurations of the odd-A, N = 131 transitional isotones above 208Pb are interpreted from their α-decay fine structure systematics and considered in terms of predictions using spherical shell and reflection-asymmetric models.

AB - Fine structure in the α decay of 22190Th, populating excited states in 21788Ra, was studied using αγ-coincidence spectroscopy. Two α-decay branches from 221Th have been newly observed, with Eα(keV)[bα(%)]=7951(8)[0.14(3)] and 8247(3)[1.51(12)], together with three previously known branches. Also, two new states in 217Ra were identified at E = 177 and 227 keV. The ground-state configurations of the odd-A, N = 131 transitional isotones above 208Pb are interpreted from their α-decay fine structure systematics and considered in terms of predictions using spherical shell and reflection-asymmetric models.

U2 - 10.1103/PhysRevC.102.054335

DO - 10.1103/PhysRevC.102.054335

M3 - Article

SN - 2469-9985

VL - 102

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - 054335

ER -

Excited states in 217Ra populated in the α decay of 221Th

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Excited states in ²¹⁷Ra populated in the α decay of ²²¹Th