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3 results on '"Heery J"'

1. Spectroscopy along Flerovium Decay Chains: Discovery of Ds280 and an Excited State in Cn282

Author

Såmark-Roth, A, Cox, DM, Rudolph, D, Sarmiento, LG, Carlsson, BG, Egido, JL, Golubev, P, Heery, J, Yakushev, A, Åberg, S, Albers, HM, Albertsson, M, Block, M, Brand, H, Calverley, T, Cantemir, R, Clark, RM, Düllmann, Ch E, 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, JV, 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, and Uusitalo, J

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
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 ^{48}Ca+^{242}Pu and ^{48}Ca+^{244}Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to ^{286}Fl and ^{288}Fl, 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 ^{282}Cn. Spectroscopy of ^{288}Fl decay chains fixed Q_{α}=10.06(1)  MeV. In one case, a Q_{α}=9.46(1)-MeV decay from ^{284}Cn into ^{280}Ds was observed, with ^{280}Ds fissioning after only 518  μs. The impact of these findings, aggregated with existing data on decay chains of ^{286,288}Fl, 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.

Published
2021

2. Spectroscopy along Flerovium Decay Chains: Discovery of ^{280}Ds and an Excited State in ^{282}Cn.

Author

Såmark-Roth, A, Cox, DM, Rudolph, D, Sarmiento, LG, Carlsson, BG, Egido, JL, Golubev, P, Heery, J, Yakushev, A, Åberg, S, Albers, HM, Albertsson, M, Block, M, Brand, H, Calverley, T, Cantemir, R, Clark, RM, Düllmann, Ch E, 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, JV, 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, and Uusitalo, J

Subjects
General Physics, Mathematical Sciences, Physical Sciences, Engineering
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 ^{48}Ca+^{242}Pu and ^{48}Ca+^{244}Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to ^{286}Fl and ^{288}Fl, 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 ^{282}Cn. Spectroscopy of ^{288}Fl decay chains fixed Q_{α}=10.06(1)  MeV. In one case, a Q_{α}=9.46(1)-MeV decay from ^{284}Cn into ^{280}Ds was observed, with ^{280}Ds fissioning after only 518  μs. The impact of these findings, aggregated with existing data on decay chains of ^{286,288}Fl, 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.

Published
2021

3. Spectroscopy along Flerovium Decay Chains: Discovery of ^{280}Ds and an Excited State in ^{282}Cn

Author

Såmark-Roth, A., Cox, D. M., Rudolph, D., Sarmiento, L. G., Carlsson, B. G., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Albertsson, M., Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, R. M., Düllmann, Ch. E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., 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, J. L., Ragnarsson, I., Runke, J., Schädel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Subjects
General Physics, Engineering, Superheavy elements, Subatomic Physics, Island of stability, Physical Sciences, Mean field theory, Alpha decay, ddc:530, Mathematical Sciences, Nuclear spectroscopy
Abstract

Physical review letters 126(3), 032503 (2021). doi:10.1103/PhysRevLett.126.032503, Published by APS, College Park, Md.

Published
2021
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