Spectroscopy along flerovium decay chains: Discovery of 280Ds and an excited state in 282Cn

Anton Såmark-Roth; Daniel Cox; Dirk Rudolph; Luis Sarmiento Pico; Gillis Carlsson; J. L. Egido; Pavel Golubev; J.A.M. Heery; Alexander Yakushev; Sven Åberg; Helena M. Albers; Martin Albertsson; M. Block; H. Brand; T. Calverley; R. Cantemir; Roderick M. Clark; Ch. E. Düllmann; J Eberth; Claes Fahlander; Ulrika Forsberg; J. M. Gates; F. Giacoppo; Michael Götz; Stefan Götz; R.-D. Herzberg; Yuliia Hrabar; E. Jäger; D. Judson; J. Khuyagbaatar; Birgit Kindler; I. Kojouharov; Jens-Volker Kratz; J. Krier; N. Kurz; L. Lens; Jimmy Ljungberg; Bettina Lommel; J. Louko; Carl-Christian Meyer; A. Mistry; C. Mokry; P. Papadakis; E. Parr; J. L. Pore; Ingemar Ragnarsson; J. Runke; Matthias Schädel; H. Schaffner; B. Schausten; D. A. Shaughnessy; P. Thörle-Pospiech; N. Trautmann; J. Uusitalo

doi:10.1103/PhysRevLett.126.032503

Spectroscopy along flerovium decay chains: Discovery of ²⁸⁰Ds and an excited state in ²⁸²Cn

Anton Såmark-Roth, Daniel Cox, Dirk Rudolph, Luis Sarmiento Pico, Gillis Carlsson, J. L. Egido, Pavel Golubev, J.A.M. Heery, Alexander Yakushev, Sven Åberg, Helena M. Albers, Martin Albertsson, M. Block, H. Brand, T. Calverley, R. Cantemir, Roderick M. Clark, Ch. E. Düllmann, J Eberth, Claes FahlanderUlrika Forsberg, J. M. Gates, F. Giacoppo, Michael Götz, Stefan Götz, R.-D. Herzberg, Yuliia Hrabar, E. Jäger, D. Judson, J. Khuyagbaatar, Birgit Kindler, I. Kojouharov, Jens-Volker Kratz, J. Krier, N. Kurz, L. Lens, Jimmy Ljungberg, Bettina Lommel, J. Louko, Carl-Christian Meyer, A. Mistry, C. Mokry, P. Papadakis, E. Parr, J. L. Pore, Ingemar Ragnarsson, J. Runke, Matthias Schädel, H. Schaffner, B. Schausten, D. A. Shaughnessy, P. Thörle-Pospiech, N. Trautmann, J. Uusitalo

Mathematical Physics

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Abstract

A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z=114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions ⁴⁸Ca+²⁴²Pu and ⁴⁸Ca+²⁴⁴Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to ²⁸⁶Fl and ²⁸⁸Fl, respectively. A prompt coincidence between a 9.60(1)-MeV α-particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely ²⁸²Cn. Spectroscopy of ²⁸⁸Fl decay chains fixed Q_α=10.06(1) MeV. In one case, a Q_α=9.46(1)-MeV decay from ²⁸⁴Cn into ²⁸⁰Ds was observed, with ²⁸⁰Ds fissioning after only 518 μs. The impact of these findings, aggregated with existing data on decay chains of ^286,288Fl, on the size of an anticipated shell gap at proton number Z=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.

Original language	English
Article number	032503
Number of pages	7
Journal	Physical Review Letters
Volume	126
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.126.032503
Publication status	Published - 2021 Jan 22

Subject classification (UKÄ)

Subatomic Physics

Free keywords

Superheavy elements
Nuclear spectroscopy
Alpha decay
Mean field theory
Island of stability

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10.1103/PhysRevLett.126.032503

PhysRevLett.126.032503Final published version, 324 KB

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Såmark-Roth, A., Cox, D., Rudolph, D., Sarmiento Pico, L., Carlsson, G., Egido, J. L., Golubev, P., Heery, J. A. M., Yakushev, A., Åberg, S., Albers, H. M., Albertsson, M., Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, R. M., Düllmann, C. E., Eberth, J., ... Uusitalo, J. (2021). Spectroscopy along flerovium decay chains: Discovery of ²⁸⁰Ds and an excited state in ²⁸²Cn. Physical Review Letters, 126(3), Article 032503. https://doi.org/10.1103/PhysRevLett.126.032503

@article{2c9efe26330c452ea5c8bb82e3753087,

title = "Spectroscopy along flerovium decay chains: Discovery of 280Ds and an excited state in 282Cn",

abstract = "A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z=114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum f{\"u}r Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions 48Ca+242Pu and 48Ca+244Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to 286Fl and 288Fl, respectively. A prompt coincidence between a 9.60(1)-MeV α-particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely 282Cn. Spectroscopy of 288Fl decay chains fixed Qα=10.06(1) MeV. In one case, a Qα=9.46(1)-MeV decay from 284Cn into 280Ds was observed, with 280Ds fissioning after only 518 μs. The impact of these findings, aggregated with existing data on decay chains of 286,288Fl, on the size of an anticipated shell gap at proton number Z=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.",

keywords = "Superheavy elements, Nuclear spectroscopy, Alpha decay, Mean field theory, Island of stability",

author = "Anton S{\aa}mark-Roth and Daniel Cox and Dirk Rudolph and {Sarmiento Pico}, Luis and Gillis Carlsson and Egido, {J. L.} and Pavel Golubev and J.A.M. Heery and Alexander Yakushev and Sven {\AA}berg and Albers, {Helena M.} and Martin Albertsson and M. Block and H. Brand and T. Calverley and R. Cantemir and Clark, {Roderick M.} and Ch. E. D{\"u}llmann and J Eberth and Claes Fahlander and Ulrika Forsberg and J. M. Gates and F. Giacoppo and Michael G{\"o}tz and Stefan G{\"o}tz and R.-D. Herzberg and Yuliia Hrabar and E. J{\"a}ger and D. Judson and J. Khuyagbaatar and Birgit Kindler and I. Kojouharov and Jens-Volker Kratz and J. Krier and N. Kurz and L. Lens and Jimmy Ljungberg and Bettina Lommel and J. Louko and Carl-Christian Meyer and A. Mistry and C. Mokry and P. Papadakis and E. Parr and Pore, {J. L.} and Ingemar Ragnarsson and J. Runke and Matthias Sch{\"a}del and H. Schaffner and B. Schausten and D. A. Shaughnessy and P. Th{\"o}rle-Pospiech and N. Trautmann and J. Uusitalo",

year = "2021",

month = jan,

day = "22",

doi = "10.1103/PhysRevLett.126.032503",

language = "English",

volume = "126",

journal = "Physical Review Letters",

issn = "1079-7114",

publisher = "American Physical Society",

number = "3",

}

Såmark-Roth, A, Cox, D, Rudolph, D , Sarmiento Pico, L , Carlsson, G, Egido, JL, Golubev, P, Heery, JAM, Yakushev, A, Åberg, S, Albers, HM, Albertsson, M, Block, M, Brand, H, Calverley, T, Cantemir, R, Clark, RM, Düllmann, CE, Eberth, J, Fahlander, C, Forsberg, U, Gates, JM, Giacoppo, F, Götz, M, Götz, S, Herzberg, R-D, Hrabar, Y, Jäger, E, Judson, D, Khuyagbaatar, J, Kindler, B, Kojouharov, I, Kratz, J-V, Krier, J, Kurz, N, Lens, L, Ljungberg, J, Lommel, B, Louko, J, Meyer, C-C, Mistry, A, Mokry, C, Papadakis, P, Parr, E, Pore, JL, Ragnarsson, I, Runke, J, Schädel, M, Schaffner, H, Schausten, B, Shaughnessy, DA, Thörle-Pospiech, P, Trautmann, N & Uusitalo, J 2021, 'Spectroscopy along flerovium decay chains: Discovery of ²⁸⁰Ds and an excited state in ²⁸²Cn', Physical Review Letters, vol. 126, no. 3, 032503. https://doi.org/10.1103/PhysRevLett.126.032503

TY - JOUR

T1 - Spectroscopy along flerovium decay chains: Discovery of 280Ds and an excited state in 282Cn

AU - Såmark-Roth, Anton

AU - Cox, Daniel

AU - Rudolph, Dirk

AU - Sarmiento Pico, Luis

AU - Carlsson, Gillis

AU - Egido, J. L.

AU - Golubev, Pavel

AU - Heery, J.A.M.

AU - Yakushev, Alexander

AU - Åberg, Sven

AU - Albers, Helena M.

AU - Albertsson, Martin

AU - Block, M.

AU - Brand, H.

AU - Calverley, T.

AU - Cantemir, R.

AU - Clark, Roderick M.

AU - Düllmann, Ch. E.

AU - Eberth, J

AU - Fahlander, Claes

AU - Forsberg, Ulrika

AU - Gates, J. M.

AU - Giacoppo, F.

AU - Götz, Michael

AU - Götz, Stefan

AU - Herzberg, R.-D.

AU - Hrabar, Yuliia

AU - Jäger, E.

AU - Judson, D.

AU - Khuyagbaatar, J.

AU - Kindler, Birgit

AU - Kojouharov, I.

AU - Kratz, Jens-Volker

AU - Krier, J.

AU - Kurz, N.

AU - Lens, L.

AU - Ljungberg, Jimmy

AU - Lommel, Bettina

AU - Louko, J.

AU - Meyer, Carl-Christian

AU - Mistry, A.

AU - Mokry, C.

AU - Papadakis, P.

AU - Parr, E.

AU - Pore, J. L.

AU - Ragnarsson, Ingemar

AU - Runke, J.

AU - Schädel, Matthias

AU - Schaffner, H.

AU - Schausten, B.

AU - Shaughnessy, D. A.

AU - Thörle-Pospiech, P.

AU - Trautmann, N.

AU - Uusitalo, J.

PY - 2021/1/22

Y1 - 2021/1/22

N2 - A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z=114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions 48Ca+242Pu and 48Ca+244Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to 286Fl and 288Fl, respectively. A prompt coincidence between a 9.60(1)-MeV α-particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely 282Cn. Spectroscopy of 288Fl decay chains fixed Qα=10.06(1) MeV. In one case, a Qα=9.46(1)-MeV decay from 284Cn into 280Ds was observed, with 280Ds fissioning after only 518 μs. The impact of these findings, aggregated with existing data on decay chains of 286,288Fl, on the size of an anticipated shell gap at proton number Z=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.

AB - A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z=114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions 48Ca+242Pu and 48Ca+244Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to 286Fl and 288Fl, respectively. A prompt coincidence between a 9.60(1)-MeV α-particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely 282Cn. Spectroscopy of 288Fl decay chains fixed Qα=10.06(1) MeV. In one case, a Qα=9.46(1)-MeV decay from 284Cn into 280Ds was observed, with 280Ds fissioning after only 518 μs. The impact of these findings, aggregated with existing data on decay chains of 286,288Fl, on the size of an anticipated shell gap at proton number Z=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.

KW - Superheavy elements

KW - Nuclear spectroscopy

KW - Alpha decay

KW - Mean field theory

KW - Island of stability

UR - https://physics.aps.org/physics-for/10.1103/PhysRevLett.126.032503

UR - https://www.lunduniversity.lu.se/article/nuclear-physicists-voyage-towards-mythical-island

UR - https://www.lu.se/artikel/karnfysikalisk-seglats-mot-mytomspunnen-o

UR - https://www.gsi.de/en/start/news/details/2021/01/26/flerovium0.htm

U2 - 10.1103/PhysRevLett.126.032503

DO - 10.1103/PhysRevLett.126.032503

M3 - Article

C2 - 33543956

SN - 1079-7114

VL - 126

JO - Physical Review Letters

JF - Physical Review Letters

IS - 3

M1 - 032503

ER -

Spectroscopy along flerovium decay chains: Discovery of ²⁸⁰Ds and an excited state in ²⁸²Cn

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