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Title: Recoil-α-fission and recoil-α–α-fission events observed in the reaction 48Ca + 243Am

Abstract

Here, products of the fusion-evaporation reaction 48Ca+243Am were studied at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. Amongst the detected thirty correlated α-decay chains associated with the production of element Z=115, two recoil-α-fission and five recoil-α–α-fission events were observed. The latter five chains are similar to four such events reported from experiments performed at the Dubna gas-filled separator, and three such events reported from an experiment at the Berkeley gas-filled separator. The four chains observed at the Dubna gas-filled separator were assigned to start from the 2n-evaporation channel 289115 due to the fact that these recoil-α–α-fission events were observed only at low excitation energies. Contrary to this interpretation, we suggest that some of these recoil-α–α-fission decay chains, as well as some of the recoil-α–α-fission and recoil-α-fission decay chains reported from Berkeley and in this article, start from the 3n-evaporation channel 288115.

Authors:
 [1];  [1];  [2];  [3];  [4];  [1];  [5];  [1];  [5];  [6];  [7];  [8];  [9];  [3];  [6];  [1];  [10];  [11];  [1];  [11] more »;  [4];  [11];  [1];  [7];  [12];  [13];  [12];  [14];  [11];  [11];  [11];  [11];  [11];  [11];  [15];  [16];  [12];  [17];  [5];  [18];  [19];  [1];  [11];  [11];  [11];  [20];  [12];  [11];  [3];  [3];  [21];  [7];  [1];  [12] « less
  1. Lund Univ. (Sweden)
  2. Helmholtz Inst. Mainz (Germany)
  3. Johannes Gutenberg Univ., Mainz (Germany)
  4. Helmholtz Inst. Mainz (Germany); Johannes Gutenberg Univ., Mainz (Germany); GSI Helmholtz Centre for Heavy Ion Research GmbH, Darmstadt (Germany)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. Univ. of Liverpool, Liverpool (United Kingdom)
  8. Helmholtz Inst. Mainz (Germany); GSI Helmholtz Centre for Heavy Ion Research GmbH, Darmstadt (Germany)
  9. Helmholtz Institute Mainz, Mainz (Germany)
  10. GSI Helmholtz Centre for Heavy Ion Research GmbH, Darmstadt (Germany); Japan Atomic Energy Agency, Ibaraki (Japan)
  11. GSI Helmholtz Centre for Heavy Ion Research GmbH, Darmstadt (Germany)
  12. Helmholtz Inst. Mainz (Germany); Johannes Gutenberg Univ., Mainz (Germany)
  13. Univ. of Warsaw, Warsaw (Poland); Univ. of York, York (United Kingdom)
  14. Helmholtz Inst. Mainz (Germany); Univ. of Groningen, Groningen (The Netherlands)
  15. GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany)
  16. Univ. of Liverpool, Liverpool (United Kingdom); Helmholtz Institute Mainz, Mainz (Germany)
  17. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Warsaw, Warsaw (Poland); Michigan State Univ., East Lansing, MI (United States)
  18. Univ. of Oslo, Oslo (Norway)
  19. Univ. of Liverpool, Liverpool (United Kingdom); Univ. of Jyvaskyla, Jyvaskyla (Finland)
  20. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Michigan State Univ., East Lansing, MI (United States)
  21. Paul Scherrer Inst. (PSI) and Univ. of Bern, Villigen (Switzerland)
Publication Date:
Research Org.:
Michigan State Univ., East Lansing, MI (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); European Commision (EC); Royal Physiographic Society in Lund (Sweden); Swedish Research Council (SRC); German Federal Ministry of Education and Research (BMBF); Science and Technology Facilities Council (STFC) (United Kingdom); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1332816
Alternate Identifier(s):
OSTI ID: 1347248; OSTI ID: 1358655; OSTI ID: 1454485; OSTI ID: 1492176
Grant/Contract Number:  
NA0002847; NA0002574; SC0008511; 262010; AC02-05CH11231; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Physics. A
Additional Journal Information:
Journal Volume: 953; Journal Issue: C; Journal ID: ISSN 0375-9474
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; superheavy elements; Element 115; Uup; α decay; spontaneous fission

Citation Formats

Forsberg, Ulrika, Rudolph, D., Andersson, L. -L., Di Nitto, A., Dullmann, Ch. E., Fahlander, C., Gates, J. M., Golubev, P., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., HeBberger, F. P., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Sarmiento, L. G., Schadel, M., Yakushev, A., Aberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Dobaczewski, J., Eberhardt, K., Even, J., Gerl, J., Jager, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nazarewicz, W., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Shi, Yue, Thorle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Turler, A., Ward, A., Ward, D. E., and Wiehl, N. Recoil-α-fission and recoil-α–α-fission events observed in the reaction 48Ca + 243Am. United States: N. p., 2016. Web. doi:10.1016/j.nuclphysa.2016.04.025.
Forsberg, Ulrika, Rudolph, D., Andersson, L. -L., Di Nitto, A., Dullmann, Ch. E., Fahlander, C., Gates, J. M., Golubev, P., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., HeBberger, F. P., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Sarmiento, L. G., Schadel, M., Yakushev, A., Aberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Dobaczewski, J., Eberhardt, K., Even, J., Gerl, J., Jager, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nazarewicz, W., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Shi, Yue, Thorle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Turler, A., Ward, A., Ward, D. E., & Wiehl, N. Recoil-α-fission and recoil-α–α-fission events observed in the reaction 48Ca + 243Am. United States. doi:10.1016/j.nuclphysa.2016.04.025.
Forsberg, Ulrika, Rudolph, D., Andersson, L. -L., Di Nitto, A., Dullmann, Ch. E., Fahlander, C., Gates, J. M., Golubev, P., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., HeBberger, F. P., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Sarmiento, L. G., Schadel, M., Yakushev, A., Aberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Dobaczewski, J., Eberhardt, K., Even, J., Gerl, J., Jager, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nazarewicz, W., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Shi, Yue, Thorle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Turler, A., Ward, A., Ward, D. E., and Wiehl, N. Tue . "Recoil-α-fission and recoil-α–α-fission events observed in the reaction 48Ca + 243Am". United States. doi:10.1016/j.nuclphysa.2016.04.025. https://www.osti.gov/servlets/purl/1332816.
@article{osti_1332816,
title = {Recoil-α-fission and recoil-α–α-fission events observed in the reaction 48Ca + 243Am},
author = {Forsberg, Ulrika and Rudolph, D. and Andersson, L. -L. and Di Nitto, A. and Dullmann, Ch. E. and Fahlander, C. and Gates, J. M. and Golubev, P. and Gregorich, K. E. and Gross, C. J. and Herzberg, R. -D. and HeBberger, F. P. and Khuyagbaatar, J. and Kratz, J. V. and Rykaczewski, K. and Sarmiento, L. G. and Schadel, M. and Yakushev, A. and Aberg, S. and Ackermann, D. and Block, M. and Brand, H. and Carlsson, B. G. and Cox, D. and Derkx, X. and Dobaczewski, J. and Eberhardt, K. and Even, J. and Gerl, J. and Jager, E. and Kindler, B. and Krier, J. and Kojouharov, I. and Kurz, N. and Lommel, B. and Mistry, A. and Mokry, C. and Nazarewicz, W. and Nitsche, H. and Omtvedt, J. P. and Papadakis, P. and Ragnarsson, I. and Runke, J. and Schaffner, H. and Schausten, B. and Shi, Yue and Thorle-Pospiech, P. and Torres, T. and Traut, T. and Trautmann, N. and Turler, A. and Ward, A. and Ward, D. E. and Wiehl, N.},
abstractNote = {Here, products of the fusion-evaporation reaction 48Ca+243Am were studied at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. Amongst the detected thirty correlated α-decay chains associated with the production of element Z=115, two recoil-α-fission and five recoil-α–α-fission events were observed. The latter five chains are similar to four such events reported from experiments performed at the Dubna gas-filled separator, and three such events reported from an experiment at the Berkeley gas-filled separator. The four chains observed at the Dubna gas-filled separator were assigned to start from the 2n-evaporation channel 289115 due to the fact that these recoil-α–α-fission events were observed only at low excitation energies. Contrary to this interpretation, we suggest that some of these recoil-α–α-fission decay chains, as well as some of the recoil-α–α-fission and recoil-α-fission decay chains reported from Berkeley and in this article, start from the 3n-evaporation channel 288115.},
doi = {10.1016/j.nuclphysa.2016.04.025},
journal = {Nuclear Physics. A},
number = C,
volume = 953,
place = {United States},
year = {2016},
month = {4}
}

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Figures / Tables:

Figure 1 Figure 1: (Colour online) Correlation times [(a)–(c)] and α-energy spectra [(d) and (e)] of decay chains observed in the reaction 48Ca + 243Am. The term “α energy” includes possible summation with energy deposited by conversion or Auger electrons. The black histograms are reference spectra and relate to experimental data frommore » the 96 chains associated with the 3n evaporation channel 288115 in Refs. [7,8,12]. The shaded areas in panels (a)–(c) are the corresponding time distributions. The shaded areas in panels (d) and (e) are the energy distributions derived from Monte Carlo simulations as outlined in Refs. [7,32,35]. The data points of the fourteen observed recoil-α–(α-)fission events are provided on top of each spectrum, labelled with an identifier according to Table 1. Filled symbols indicate measurement during beam-off periods. Diamonds refer to data from Ref. [12], triangles refer to data from Ref. [8], and squares and circles refer to the present data observed at 242.1 and 245.0 MeV mid-target beam energy, respectively. ‘n/a’ means ‘not applicable’, ‘escape’ denotes events with low-energy detection solely in the implantation DSSSD.« less

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Works referencing / citing this record:

Nuclear structure of the transactinides – investigated by decay spectroscopy
journal, January 2016


Nuclear structure of the transactinides – investigated by decay spectroscopy
journal, January 2016