Competition between allowed and first-forbidden β decays of at 208 and expansion of the Po 208 level scheme

M. Brunet; Zs Podolyák; T. A. Berry; B. A. Brown; R. J. Carroll; R. Lica; Ch Sotty; A. N. Andreyev; M. J.G. Borge; J. G. Cubiss; L. M. Fraile; H. O.U. Fynbo; E. Gamba; P. Greenlees; L. J. Harkness-Brennan; M. Huyse; D. S. Judson; J. Konki; J. Kurcewicz; I. Lazarus; M. Madurga; N. Marginean; R. Marginean; I. Marroquin; C. Mihai; E. Nácher; A. Negret; S. Pascu; R. D. Page; A. Perea; J. Phrompao; M. Piersa; V. Pucknell; P. Rahkila; E. Rapisarda; P. H. Regan; F. Rotaru; M. Rudigier; C. M. Shand; R. Shearman; E. C. Simpson; T. Stora; O. Tengblad; P. Van Duppen; V. Vedia; S. Vinals; R. Wadsworth; N. Warr; H. De Witte

doi:10.1103/PhysRevC.103.054327

Competition between allowed and first-forbidden β decays of at 208 and expansion of the Po 208 level scheme

M. Brunet^*, Zs Podolyák, T. A. Berry, B. A. Brown, R. J. Carroll, R. Lica, Ch Sotty, A. N. Andreyev, M. J.G. Borge, J. G. Cubiss, L. M. Fraile, H. O.U. Fynbo, E. Gamba, P. Greenlees, L. J. Harkness-Brennan, M. Huyse, D. S. Judson, J. Konki, J. Kurcewicz, I. LazarusM. Madurga, N. Marginean, R. Marginean, I. Marroquin, C. Mihai, E. Nácher, A. Negret, S. Pascu, R. D. Page, A. Perea, J. Phrompao, M. Piersa, V. Pucknell, P. Rahkila, E. Rapisarda, P. H. Regan, F. Rotaru, M. Rudigier, C. M. Shand, R. Shearman, E. C. Simpson, T. Stora, O. Tengblad, P. Van Duppen, V. Vedia, S. Vinals, R. Wadsworth, N. Warr, H. De Witte

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

The structure of Po208 populated through the EC/β+ decay of At208 is investigated using γ-ray spectroscopy at the ISOLDE Decay Station. The presented level scheme contains 27 new excited states and 43 new transitions, as well as a further 50 previously observed γ rays which have been (re)assigned a position. The level scheme is compared to shell model calculations. Through this analysis approximately half of the β-decay strength of At208 is found to proceed via allowed decay and half via first-forbidden decay. The first-forbidden transitions predominantly populate core excited states at high excitation energies, which is qualitatively understood using shell model considerations. This mass region provides an excellent testing ground for the competition between allowed and first-forbidden β-decay calculations, important for the detailed understanding of the nucleosynthesis of heavy elements.

Original language	English
Article number	054327
Number of pages	13
Journal	Physical Review C - Nuclear Physics
Volume	103
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.103.054327
Publication status	Published - 28 May 2021

Bibliographical note

Funding Information:
The authors would like to thank the operators of the ISOLDE facility for providing the beam for this experiment. The research leading to these results received funding from the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 654002. Support from the European Union Seventh Framework through ENSAR Contract No. 262010, as well as the Science and Technology Facilities Council (U.K.) through Grants No. ST/P005314/1, No. ST/L005743/1, No. ST/J000051/1, No. ST/L005670/1, and No. ST/P004598/1, the German BMBF under Contract No. 05P18PKCIA and “Verbundprojekt 05P2018” as well as Spanish MINECO Grants No. FPA2015-65035-P and No. FPA2017-87568-P, FWOVlaanderen (Belgium), GOA/2015/010 (BOF KU Leuven), the Excellence of Science Programme (EOS-FWO), the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (BriX network P7/12), the Polish National Science Centre under Contracts No. UMO-2015/18/M/ST2/00523 and No. UMO-2019/33/N/ST2/03023, National Science Foundation (U.S.) Grant No. PHY1811855, and the Romanian IFA project CERN-RO/ISOLDE is acknowledged. P.H.R. acknowledges support from the U.K. Department for Business, Energy and Industrial Strategy via the National Measurement Office.

Publisher Copyright:
© 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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Cite this

Brunet, M., Podolyák, Z., Berry, T. A., Brown, B. A., Carroll, R. J., Lica, R., Sotty, C., Andreyev, A. N., Borge, M. J. G., Cubiss, J. G., Fraile, L. M., Fynbo, H. O. U., Gamba, E., Greenlees, P., Harkness-Brennan, L. J., Huyse, M., Judson, D. S., Konki, J., Kurcewicz, J., ... De Witte, H. (2021). Competition between allowed and first-forbidden β decays of at 208 and expansion of the Po 208 level scheme. Physical Review C - Nuclear Physics, 103(5), Article 054327. https://doi.org/10.1103/PhysRevC.103.054327

@article{f7d02fbc5a0e4545ba0de2af6ba96317,

title = "Competition between allowed and first-forbidden β decays of at 208 and expansion of the Po 208 level scheme",

abstract = "The structure of Po208 populated through the EC/β+ decay of At208 is investigated using γ-ray spectroscopy at the ISOLDE Decay Station. The presented level scheme contains 27 new excited states and 43 new transitions, as well as a further 50 previously observed γ rays which have been (re)assigned a position. The level scheme is compared to shell model calculations. Through this analysis approximately half of the β-decay strength of At208 is found to proceed via allowed decay and half via first-forbidden decay. The first-forbidden transitions predominantly populate core excited states at high excitation energies, which is qualitatively understood using shell model considerations. This mass region provides an excellent testing ground for the competition between allowed and first-forbidden β-decay calculations, important for the detailed understanding of the nucleosynthesis of heavy elements.",

author = "M. Brunet and Zs Podoly{\'a}k and Berry, {T. A.} and Brown, {B. A.} and Carroll, {R. J.} and R. Lica and Ch Sotty and Andreyev, {A. N.} and Borge, {M. J.G.} and Cubiss, {J. G.} and Fraile, {L. M.} and Fynbo, {H. O.U.} and E. Gamba and P. Greenlees and Harkness-Brennan, {L. J.} and M. Huyse and Judson, {D. S.} and J. Konki and J. Kurcewicz and I. Lazarus and M. Madurga and N. Marginean and R. Marginean and I. Marroquin and C. Mihai and E. N{\'a}cher and A. Negret and S. Pascu and Page, {R. D.} and A. Perea and J. Phrompao and M. Piersa and V. Pucknell and P. Rahkila and E. Rapisarda and Regan, {P. H.} and F. Rotaru and M. Rudigier and Shand, {C. M.} and R. Shearman and Simpson, {E. C.} and T. Stora and O. Tengblad and {Van Duppen}, P. and V. Vedia and S. Vinals and R. Wadsworth and N. Warr and {De Witte}, H.",

note = "Funding Information: The authors would like to thank the operators of the ISOLDE facility for providing the beam for this experiment. The research leading to these results received funding from the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 654002. Support from the European Union Seventh Framework through ENSAR Contract No. 262010, as well as the Science and Technology Facilities Council (U.K.) through Grants No. ST/P005314/1, No. ST/L005743/1, No. ST/J000051/1, No. ST/L005670/1, and No. ST/P004598/1, the German BMBF under Contract No. 05P18PKCIA and “Verbundprojekt 05P2018” as well as Spanish MINECO Grants No. FPA2015-65035-P and No. FPA2017-87568-P, FWOVlaanderen (Belgium), GOA/2015/010 (BOF KU Leuven), the Excellence of Science Programme (EOS-FWO), the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (BriX network P7/12), the Polish National Science Centre under Contracts No. UMO-2015/18/M/ST2/00523 and No. UMO-2019/33/N/ST2/03023, National Science Foundation (U.S.) Grant No. PHY1811855, and the Romanian IFA project CERN-RO/ISOLDE is acknowledged. P.H.R. acknowledges support from the U.K. Department for Business, Energy and Industrial Strategy via the National Measurement Office. Publisher Copyright: {\textcopyright} 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",

year = "2021",

month = may,

day = "28",

doi = "10.1103/PhysRevC.103.054327",

language = "English",

volume = "103",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "5",

}

Brunet, M, Podolyák, Z, Berry, TA, Brown, BA, Carroll, RJ, Lica, R, Sotty, C, Andreyev, AN, Borge, MJG, Cubiss, JG, Fraile, LM, Fynbo, HOU, Gamba, E, Greenlees, P, Harkness-Brennan, LJ, Huyse, M, Judson, DS, Konki, J, Kurcewicz, J, Lazarus, I, Madurga, M, Marginean, N, Marginean, R, Marroquin, I, Mihai, C, Nácher, E, Negret, A, Pascu, S, Page, RD, Perea, A, Phrompao, J, Piersa, M, Pucknell, V, Rahkila, P, Rapisarda, E, Regan, PH, Rotaru, F, Rudigier, M, Shand, CM, Shearman, R, Simpson, EC, Stora, T, Tengblad, O, Van Duppen, P, Vedia, V, Vinals, S, Wadsworth, R, Warr, N & De Witte, H 2021, 'Competition between allowed and first-forbidden β decays of at 208 and expansion of the Po 208 level scheme', Physical Review C - Nuclear Physics, vol. 103, no. 5, 054327. https://doi.org/10.1103/PhysRevC.103.054327

TY - JOUR

T1 - Competition between allowed and first-forbidden β decays of at 208 and expansion of the Po 208 level scheme

AU - Brunet, M.

AU - Podolyák, Zs

AU - Berry, T. A.

AU - Brown, B. A.

AU - Carroll, R. J.

AU - Lica, R.

AU - Sotty, Ch

AU - Andreyev, A. N.

AU - Borge, M. J.G.

AU - Cubiss, J. G.

AU - Fraile, L. M.

AU - Fynbo, H. O.U.

AU - Gamba, E.

AU - Greenlees, P.

AU - Harkness-Brennan, L. J.

AU - Huyse, M.

AU - Judson, D. S.

AU - Konki, J.

AU - Kurcewicz, J.

AU - Lazarus, I.

AU - Madurga, M.

AU - Marginean, N.

AU - Marginean, R.

AU - Marroquin, I.

AU - Mihai, C.

AU - Nácher, E.

AU - Negret, A.

AU - Pascu, S.

AU - Page, R. D.

AU - Perea, A.

AU - Phrompao, J.

AU - Piersa, M.

AU - Pucknell, V.

AU - Rahkila, P.

AU - Rapisarda, E.

AU - Regan, P. H.

AU - Rotaru, F.

AU - Rudigier, M.

AU - Shand, C. M.

AU - Shearman, R.

AU - Simpson, E. C.

AU - Stora, T.

AU - Tengblad, O.

AU - Van Duppen, P.

AU - Vedia, V.

AU - Vinals, S.

AU - Wadsworth, R.

AU - Warr, N.

AU - De Witte, H.

N1 - Funding Information: The authors would like to thank the operators of the ISOLDE facility for providing the beam for this experiment. The research leading to these results received funding from the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 654002. Support from the European Union Seventh Framework through ENSAR Contract No. 262010, as well as the Science and Technology Facilities Council (U.K.) through Grants No. ST/P005314/1, No. ST/L005743/1, No. ST/J000051/1, No. ST/L005670/1, and No. ST/P004598/1, the German BMBF under Contract No. 05P18PKCIA and “Verbundprojekt 05P2018” as well as Spanish MINECO Grants No. FPA2015-65035-P and No. FPA2017-87568-P, FWOVlaanderen (Belgium), GOA/2015/010 (BOF KU Leuven), the Excellence of Science Programme (EOS-FWO), the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (BriX network P7/12), the Polish National Science Centre under Contracts No. UMO-2015/18/M/ST2/00523 and No. UMO-2019/33/N/ST2/03023, National Science Foundation (U.S.) Grant No. PHY1811855, and the Romanian IFA project CERN-RO/ISOLDE is acknowledged. P.H.R. acknowledges support from the U.K. Department for Business, Energy and Industrial Strategy via the National Measurement Office. Publisher Copyright: © 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/5/28

Y1 - 2021/5/28

N2 - The structure of Po208 populated through the EC/β+ decay of At208 is investigated using γ-ray spectroscopy at the ISOLDE Decay Station. The presented level scheme contains 27 new excited states and 43 new transitions, as well as a further 50 previously observed γ rays which have been (re)assigned a position. The level scheme is compared to shell model calculations. Through this analysis approximately half of the β-decay strength of At208 is found to proceed via allowed decay and half via first-forbidden decay. The first-forbidden transitions predominantly populate core excited states at high excitation energies, which is qualitatively understood using shell model considerations. This mass region provides an excellent testing ground for the competition between allowed and first-forbidden β-decay calculations, important for the detailed understanding of the nucleosynthesis of heavy elements.

AB - The structure of Po208 populated through the EC/β+ decay of At208 is investigated using γ-ray spectroscopy at the ISOLDE Decay Station. The presented level scheme contains 27 new excited states and 43 new transitions, as well as a further 50 previously observed γ rays which have been (re)assigned a position. The level scheme is compared to shell model calculations. Through this analysis approximately half of the β-decay strength of At208 is found to proceed via allowed decay and half via first-forbidden decay. The first-forbidden transitions predominantly populate core excited states at high excitation energies, which is qualitatively understood using shell model considerations. This mass region provides an excellent testing ground for the competition between allowed and first-forbidden β-decay calculations, important for the detailed understanding of the nucleosynthesis of heavy elements.

UR - http://www.scopus.com/inward/record.url?scp=85107311034&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.103.054327

DO - 10.1103/PhysRevC.103.054327

M3 - Article

SN - 0556-2813

VL - 103

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 5

M1 - 054327

ER -

Competition between allowed and first-forbidden β decays of at 208 and expansion of the Po 208 level scheme

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Competition between allowed and first-forbidden β decays of at 208 and expansion of the Po 208 level scheme

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