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

U. Forsberg; D. Rudolph; L. L. Andersson; A. Di Nitto; Ch E. Düllmann; C. Fahlander; J. M. Gates; P. Golubev; K. E. Gregorich; C. J. Gross; R. D. Herzberg; F. P. Heßberger; J. Khuyagbaatar; J. V. Kratz; K. Rykaczewski; L. G. Sarmiento; M. Schädel; A. Yakushev; S. Åberg; D. Ackermann; M. Block; H. Brand; B. G. Carlsson; D. Cox; X. Derkx; J. Dobaczewski; K. Eberhardt; J. Even; J. Gerl; E. Jäger; B. Kindler; J. Krier; I. Kojouharov; N. Kurz; B. Lommel; A. Mistry; C. Mokry; W. Nazarewicz; H. Nitsche; J. P. Omtvedt; P. Papadakis; I. Ragnarsson; J. Runke; H. Schaffner; B. Schausten; Yue Shi; P. Thörle-Pospiech; T. Torres; T. Traut; N. Trautmann; A. Türler; A. Ward; D. E. Ward; N. Wiehl

doi:10.1016/j.nuclphysa.2016.04.025

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

U. Forsberg, D. Rudolph, L. L. Andersson, A. Di Nitto, Ch E. Düllmann, C. Fahlander, J. M. Gates, P. Golubev, K. E. Gregorich, C. J. Gross, R. D. Herzberg, F. P. Heßberger, J. Khuyagbaatar, J. V. Kratz, K. Rykaczewski, L. G. Sarmiento, M. Schädel, A. Yakushev, S. Åberg, D. AckermannM. Block, H. Brand, B. G. Carlsson, D. Cox, X. Derkx, J. Dobaczewski, K. Eberhardt, J. Even, J. Gerl, E. Jäger, B. Kindler, J. Krier, I. Kojouharov, N. Kurz, B. Lommel, A. Mistry, C. Mokry, W. Nazarewicz, H. Nitsche, J. P. Omtvedt, P. Papadakis, I. Ragnarsson, J. Runke, H. Schaffner, B. Schausten, Yue Shi, P. Thörle-Pospiech, T. Torres, T. Traut, N. Trautmann, A. Türler, A. Ward, D. E. Ward, N. Wiehl

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Abstract

Products of the fusion-evaporation reaction ⁴⁸Ca + ²⁴³Am were studied with the TASISpec set-up at the gas-filled separator TASCA 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.

Original language	English
Pages (from-to)	117-138
Number of pages	22
Journal	Nuclear Physics A
Volume	953
DOIs	https://doi.org/10.1016/j.nuclphysa.2016.04.025
State	Published - Sep 1 2016

Funding

The authors would like to thank the ion-source and the accelerator staff at GSI. This work is supported by the European Community FP7 \u2013 Capacities ENSAR No. 262010 , the Royal Physiographic Society in Lund , the Euroball Owners Committee , the Swedish Research Council , the German BMBF , the U.S. Department of Energy , Office of Science, under Award Numbers DOE-DE-NA0002574 (the Stewardship Science Academic Alliances program) and DE-SC0008511 (NUCLEI SciDAC-3 Collaboration), and the UK Science and Technology Facilities Council .

Keywords

Element 115
Spontaneous fission
Superheavy elements
Uup
α decay

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10.1016/j.nuclphysa.2016.04.025

Cite this

Forsberg, U., Rudolph, D., Andersson, L. L., Di Nitto, A., Düllmann, C. E., Fahlander, C., Gates, J. M., Golubev, P., Gregorich, K. E., Gross, C. J., Herzberg, R. D., Heßberger, F. P., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Sarmiento, L. G., Schädel, M., Yakushev, A., Åberg, S., ... Wiehl, N. (2016). Recoil-α-fission and recoil-α-α-fission events observed in the reaction ⁴⁸Ca + ²⁴³Am. Nuclear Physics A, 953, 117-138. https://doi.org/10.1016/j.nuclphysa.2016.04.025

@article{008264779bd74be4acdbf4b60d292124,

title = "Recoil-α-fission and recoil-α-α-fission events observed in the reaction 48Ca + 243Am",

abstract = "Products of the fusion-evaporation reaction 48Ca + 243Am were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum f{\"u}r 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.",

keywords = "Element 115, Spontaneous fission, Superheavy elements, Uup, α decay",

author = "U. Forsberg and D. Rudolph and Andersson, \{L. L.\} and \{Di Nitto\}, A. and D{\"u}llmann, \{Ch E.\} and C. Fahlander and Gates, \{J. M.\} and P. Golubev and Gregorich, \{K. E.\} and Gross, \{C. J.\} and Herzberg, \{R. D.\} and He{\ss}berger, \{F. P.\} and J. Khuyagbaatar and Kratz, \{J. V.\} and K. Rykaczewski and Sarmiento, \{L. G.\} and M. Sch{\"a}del and A. Yakushev and S. {\AA}berg and D. Ackermann and M. Block and H. Brand and Carlsson, \{B. G.\} and D. Cox and X. Derkx and J. Dobaczewski and K. Eberhardt and J. Even and J. Gerl and E. J{\"a}ger and B. Kindler and J. Krier and I. Kojouharov and N. Kurz and B. Lommel and A. Mistry and C. Mokry and W. Nazarewicz and H. Nitsche and Omtvedt, \{J. P.\} and P. Papadakis and I. Ragnarsson and J. Runke and H. Schaffner and B. Schausten and Yue Shi and P. Th{\"o}rle-Pospiech and T. Torres and T. Traut and N. Trautmann and A. T{\"u}rler and A. Ward and Ward, \{D. E.\} and N. Wiehl",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2016",

month = sep,

day = "1",

doi = "10.1016/j.nuclphysa.2016.04.025",

language = "English",

volume = "953",

pages = "117--138",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier",

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Forsberg, U, Rudolph, D, Andersson, LL, Di Nitto, A, Düllmann, CE, Fahlander, C, Gates, JM, Golubev, P, Gregorich, KE, Gross, CJ, Herzberg, RD, Heßberger, FP, Khuyagbaatar, J, Kratz, JV, Rykaczewski, K, Sarmiento, LG, Schädel, M, Yakushev, A, Åberg, S, Ackermann, D, Block, M, Brand, H, Carlsson, BG, Cox, D, Derkx, X, Dobaczewski, J, Eberhardt, K, Even, J, Gerl, J, Jäger, E, Kindler, B, Krier, J, Kojouharov, I, Kurz, N, Lommel, B, Mistry, A, Mokry, C, Nazarewicz, W, Nitsche, H, Omtvedt, JP, Papadakis, P, Ragnarsson, I, Runke, J, Schaffner, H, Schausten, B, Shi, Y, Thörle-Pospiech, P, Torres, T, Traut, T, Trautmann, N, Türler, A, Ward, A, Ward, DE & Wiehl, N 2016, 'Recoil-α-fission and recoil-α-α-fission events observed in the reaction ⁴⁸Ca + ²⁴³Am', Nuclear Physics A, vol. 953, pp. 117-138. https://doi.org/10.1016/j.nuclphysa.2016.04.025

TY - JOUR

T1 - Recoil-α-fission and recoil-α-α-fission events observed in the reaction 48Ca + 243Am

AU - Forsberg, U.

AU - Rudolph, D.

AU - Andersson, L. L.

AU - Di Nitto, A.

AU - Düllmann, Ch E.

AU - Fahlander, C.

AU - Gates, J. M.

AU - Golubev, P.

AU - Gregorich, K. E.

AU - Gross, C. J.

AU - Herzberg, R. D.

AU - Heßberger, F. P.

AU - Khuyagbaatar, J.

AU - Kratz, J. V.

AU - Rykaczewski, K.

AU - Sarmiento, L. G.

AU - Schädel, M.

AU - Yakushev, A.

AU - Åberg, S.

AU - Ackermann, D.

AU - Block, M.

AU - Brand, H.

AU - Carlsson, B. G.

AU - Cox, D.

AU - Derkx, X.

AU - Dobaczewski, J.

AU - Eberhardt, K.

AU - Even, J.

AU - Gerl, J.

AU - Jäger, E.

AU - Kindler, B.

AU - Krier, J.

AU - Kojouharov, I.

AU - Kurz, N.

AU - Lommel, B.

AU - Mistry, A.

AU - Mokry, C.

AU - Nazarewicz, W.

AU - Nitsche, H.

AU - Omtvedt, J. P.

AU - Papadakis, P.

AU - Ragnarsson, I.

AU - Runke, J.

AU - Schaffner, H.

AU - Schausten, B.

AU - Shi, Yue

AU - Thörle-Pospiech, P.

AU - Torres, T.

AU - Traut, T.

AU - Trautmann, N.

AU - Türler, A.

AU - Ward, A.

AU - Ward, D. E.

AU - Wiehl, N.

PY - 2016/9/1

Y1 - 2016/9/1

N2 - Products of the fusion-evaporation reaction 48Ca + 243Am were studied with the TASISpec set-up at the gas-filled separator TASCA 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.

AB - Products of the fusion-evaporation reaction 48Ca + 243Am were studied with the TASISpec set-up at the gas-filled separator TASCA 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.

KW - Element 115

KW - Spontaneous fission

KW - Superheavy elements

KW - Uup

KW - α decay

UR - https://www.scopus.com/pages/publications/84965126643

U2 - 10.1016/j.nuclphysa.2016.04.025

DO - 10.1016/j.nuclphysa.2016.04.025

M3 - Article

AN - SCOPUS:84965126643

SN - 0375-9474

VL - 953

SP - 117

EP - 138

JO - Nuclear Physics A

JF - Nuclear Physics A

ER -