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

U. Forsberg; D. Rudolph; L.-L. Andersson; A. Di Nitto; Ch.E.; D\"ullmann; 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. Sch\"adel; A. Yakushev; S. \r{A}berg; D. Ackermann; M. Block,; H. Brand; B.G. Carlsson; D. Cox; X. Derkx; J. Dobaczewski; K. Eberhardt; J.; Even; C. Fahlander; J. Gerl; E. J\"ager; 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,; Y. Shi; P. Th\"orle-Pospiech; T. Torres; T. Traut; N. Trautmann; A. T\"urler,; A. Ward; D.E. Ward; N. Wiehl

arXiv:1502.03030·nucl-ex·June 22, 2016

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

U. Forsberg, D. Rudolph, L.-L. Andersson, A. Di Nitto, Ch.E., D\"ullmann, 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. Sch\"adel, A. Yakushev, S. \r{A}berg, D. Ackermann

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TL;DR

This study reports the observation of recoil-alpha-fission events in the fusion-evaporation reaction Ca-48 + Am-243, offering new interpretations of decay chains and contributing to understanding superheavy element production.

Contribution

It presents new experimental data on decay chains of element Z=115 and proposes an alternative interpretation of recoil-alpha-fission events compared to previous studies.

Findings

01

Observed 30 alpha-decay chains with recoil-alpha-fission events

02

Identified 2 recoil-alpha-fission and 5 recoil-alpha-alpha-fission events

03

Proposed that 8 decay chains originate from the 3n-evaporation channel

Abstract

Products of the fusion-evaporation reaction Ca-48 + Am-243 were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum f\"ur Schwerionenforschung. Amongst the detected thirty correlated alpha-decay chains associated with the production of element Z=115, two recoil-alpha-fission and five recoil-alpha-alpha-fission events were observed. The latter are similar to four such events reported from experiments performed at the Dubna gas-filled separator. Contrary to their interpretation, we propose an alternative view, namely to assign eight of these eleven decay chains of recoil-alpha(-alpha)-fission type to start from the 3n-evaporation channel 115-288. The other three decay chains remain viable candidates for the 2n-evaporation channel 115-289.

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