Spectroscopy at the two-proton drip line: excited states in W-158

D. T. Joss; R. D. Page; A. Herzán; L. Donosa; J. Uusitalo; R. J. Carroll; I. G. Darby; K. Andgren; B. Cederwall; S. Eeckhaudt; T. Grahn; P.T. Greenlees; B. Hadinia; U. Jakobsson; P.M. Jones; R. Julin; S. Juutinen; M. Leino; A. -P. Leppanen; M. Nyman; D. O'Donnell; J. Pakarinen; P. Rahkila; M. Sandzelius; J. Sarén; C. Scholey; D. Seweryniak; J Simpson; J. Sorri

doi:10.1016/j.physletb.2017.07.031

Spectroscopy at the two-proton drip line: excited states in W-158

D. T. Joss, R. D. Page, A. Herzán, L. Donosa, J. Uusitalo, R. J. Carroll, I. G. Darby, K. Andgren, B. Cederwall, S. Eeckhaudt, T. Grahn, P.T. Greenlees, B. Hadinia, U. Jakobsson, P.M. Jones, R. Julin, S. Juutinen, M. Leino, A. -P. Leppanen, M. NymanD. O'Donnell, J. Pakarinen, P. Rahkila, M. Sandzelius, J. Sarén, C. Scholey, D. Seweryniak, J Simpson, J. Sorri

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Abstract

Excited states have been identified in the heaviest known even-Z N=84 isotone ¹⁵⁸W, which lies in a region of one-proton emitters and the two-proton drip line. The observation of γ-ray transitions feeding the ground state establishes the excitation energy of the yrast 6⁺ state confirming the spin-gap nature of the α-decaying 8+ isomer. The 8⁺ isomer is also expected to be unbound to two-proton emission but no evidence for this decay mode was observed. An upper limit for the two-proton decay branch has been deduced as b_2p ≤ 0.17% at the 90% confidence level. The possibility of observing two-proton emission from multiparticle isomers in nearby nuclides is considered.

Original language	English
Pages (from-to)	703-707
Journal	Physics Letters B
Volume	772
Early online date	20 Jul 2017
DOIs	https://doi.org/10.1016/j.physletb.2017.07.031
Publication status	Published - 10 Sept 2017
Externally published	Yes

Keywords

Multiparticle excited states
Proton radioactivity

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10.1016/j.physletb.2017.07.031Licence: CC BY

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Joss, D. T., Page, R. D., Herzán, A., Donosa, L., Uusitalo, J., Carroll, R. J., Darby, I. G., Andgren, K., Cederwall, B., Eeckhaudt, S., Grahn, T., Greenlees, P. T., Hadinia, B., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Leino, M., Leppanen, A. .-P., ... Sorri, J. (2017). Spectroscopy at the two-proton drip line: excited states in W-158. Physics Letters B, 772, 703-707. https://doi.org/10.1016/j.physletb.2017.07.031

@article{4e44fae427e6427bae2e0ab4097f6fde,

title = "Spectroscopy at the two-proton drip line: excited states in W-158",

abstract = "Excited states have been identified in the heaviest known even-Z N=84 isotone 158W, which lies in a region of one-proton emitters and the two-proton drip line. The observation of γ-ray transitions feeding the ground state establishes the excitation energy of the yrast 6+ state confirming the spin-gap nature of the α-decaying 8+ isomer. The 8+ isomer is also expected to be unbound to two-proton emission but no evidence for this decay mode was observed. An upper limit for the two-proton decay branch has been deduced as b2p ≤ 0.17% at the 90% confidence level. The possibility of observing two-proton emission from multiparticle isomers in nearby nuclides is considered.",

keywords = "Multiparticle excited states, Proton radioactivity",

author = "Joss, {D. T.} and Page, {R. D.} and A. Herz{\'a}n and L. Donosa and J. Uusitalo and Carroll, {R. J.} and Darby, {I. G.} and K. Andgren and B. Cederwall and S. Eeckhaudt and T. Grahn and P.T. Greenlees and B. Hadinia and U. Jakobsson and P.M. Jones and R. Julin and S. Juutinen and M. Leino and Leppanen, {A. -P.} and M. Nyman and D. O'Donnell and J. Pakarinen and P. Rahkila and M. Sandzelius and J. Sar{\'e}n and C. Scholey and D. Seweryniak and J Simpson and J. Sorri",

year = "2017",

month = sep,

day = "10",

doi = "10.1016/j.physletb.2017.07.031",

language = "English",

volume = "772",

pages = "703--707",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

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Joss, DT, Page, RD, Herzán, A, Donosa, L, Uusitalo, J, Carroll, RJ, Darby, IG, Andgren, K, Cederwall, B, Eeckhaudt, S, Grahn, T, Greenlees, PT, Hadinia, B, Jakobsson, U, Jones, PM, Julin, R, Juutinen, S, Leino, M, Leppanen, A-P, Nyman, M, O'Donnell, D, Pakarinen, J, Rahkila, P, Sandzelius, M, Sarén, J, Scholey, C, Seweryniak, D, Simpson, J & Sorri, J 2017, 'Spectroscopy at the two-proton drip line: excited states in W-158', Physics Letters B, vol. 772, pp. 703-707. https://doi.org/10.1016/j.physletb.2017.07.031

TY - JOUR

T1 - Spectroscopy at the two-proton drip line

T2 - excited states in W-158

AU - Joss, D. T.

AU - Page, R. D.

AU - Herzán, A.

AU - Donosa, L.

AU - Uusitalo, J.

AU - Carroll, R. J.

AU - Darby, I. G.

AU - Andgren, K.

AU - Cederwall, B.

AU - Eeckhaudt, S.

AU - Grahn, T.

AU - Greenlees, P.T.

AU - Hadinia, B.

AU - Jakobsson, U.

AU - Jones, P.M.

AU - Julin, R.

AU - Juutinen, S.

AU - Leino, M.

AU - Leppanen, A. -P.

AU - Nyman, M.

AU - O'Donnell, D.

AU - Pakarinen, J.

AU - Rahkila, P.

AU - Sandzelius, M.

AU - Sarén, J.

AU - Scholey, C.

AU - Seweryniak, D.

AU - Simpson, J

AU - Sorri, J.

PY - 2017/9/10

Y1 - 2017/9/10

N2 - Excited states have been identified in the heaviest known even-Z N=84 isotone 158W, which lies in a region of one-proton emitters and the two-proton drip line. The observation of γ-ray transitions feeding the ground state establishes the excitation energy of the yrast 6+ state confirming the spin-gap nature of the α-decaying 8+ isomer. The 8+ isomer is also expected to be unbound to two-proton emission but no evidence for this decay mode was observed. An upper limit for the two-proton decay branch has been deduced as b2p ≤ 0.17% at the 90% confidence level. The possibility of observing two-proton emission from multiparticle isomers in nearby nuclides is considered.

AB - Excited states have been identified in the heaviest known even-Z N=84 isotone 158W, which lies in a region of one-proton emitters and the two-proton drip line. The observation of γ-ray transitions feeding the ground state establishes the excitation energy of the yrast 6+ state confirming the spin-gap nature of the α-decaying 8+ isomer. The 8+ isomer is also expected to be unbound to two-proton emission but no evidence for this decay mode was observed. An upper limit for the two-proton decay branch has been deduced as b2p ≤ 0.17% at the 90% confidence level. The possibility of observing two-proton emission from multiparticle isomers in nearby nuclides is considered.

KW - Multiparticle excited states

KW - Proton radioactivity

U2 - 10.1016/j.physletb.2017.07.031

DO - 10.1016/j.physletb.2017.07.031

M3 - Article

SN - 0370-2693

VL - 772

SP - 703

EP - 707

JO - Physics Letters B

JF - Physics Letters B

ER -

Spectroscopy at the two-proton drip line: excited states in W-158

Abstract

Keywords

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