Investigation of the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mmultiscripts><mi>Pu</mi><mprescripts></mprescripts><none></none><mn>244</mn></mmultiscripts><mo>(</mo><mmultiscripts><mi>Ca</mi><mprescripts></mprescripts><none></none><mn>48</mn></mmultiscripts><mo>,</mo><mi>x</mi><mi>n</mi><mo>)</mo><mmultiscripts><mi>Fl</mi><mprescripts></mprescripts><none></none><mrow><mn>292</mn><mo>−</mo><mi>x</mi></mrow></mmultiscripts></mrow></math> reaction with the LBNL SHREC detector: Investigation of decay chains of isotopes of flerovium (<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>Z</mi><mo>=</mo><mn>114</mn></mrow></math>)

J. M. Gates; R. Orford; D. Rudolph; A. T. Chemey; R. M. Clark; H. L. Crawford; P. Fallon; C. M. Folden, III; F. H. Garcia; P. Golubev; J. A. Gooding; K. E. Gregorich; R. A. Henderson; Y. Hrabar; A. S. Kirkland; M. McCarthy; J. A. Mildon; J. L. Pore; C. Porzio; E. Rice; L. G. Sarmiento; M. A. Stoyer; K. Thomas; P. T. Wooddy

doi:10.1103/kjyy-t1nk

Investigation of the ${}^{244}{Pu} ({}^{48}{Ca}, x n) {}^{292 - x}{Fl}$ reaction with the LBNL SHREC detector: Investigation of decay chains of isotopes of flerovium ( $Z = 114$ )

J. M. Gates ^1,*, R. Orford¹, D. Rudolph ^2,1, A. T. Chemey ³, R. M. Clark ¹, H. L. Crawford ¹, P. Fallon¹, C. M. Folden, III^4,5, F. H. Garcia ^1,† et al.

P. Golubev^2,1, J. A. Gooding ^1,6, K. E. Gregorich⁷, R. A. Henderson⁷, Y. Hrabar ², A. S. Kirkland ^4,5, M. McCarthy^1,6, J. A. Mildon ^4,5, J. L. Pore¹, C. Porzio ^1,‡, E. Rice ^1,6, L. G. Sarmiento ², M. A. Stoyer ^7,1, K. Thomas ⁷, and P. T. Wooddy ⁷

¹Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
²Department of Physics, Lund University, 22100 Lund, Sweden
³Department of Nuclear Science and Engineering, Oregon State University, Corvallis, Oregon 97331, USA
⁴Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
⁵Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
⁶Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA
⁷Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, USA

^*Contact author: jmgates@lbl.gov
^†Present address: Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
^‡Present address: CERN-ISOLDE, 1211 Geneva 23, Switzerland.

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Phys. Rev. C 113, 024611 – Published 13 February, 2026

DOI: https://doi.org/10.1103/kjyy-t1nk

Abstract

The ${}^{244}{Pu} ({}^{48}{Ca}, x n) {}^{292 - x}{Fl}$ reaction was investigated at Lawrence Berkeley National Laboratory’s 88 Inch Cyclotron using the Berkeley Gas-filled Separator (BGS), the newly installed Superheavy Recoil detector, along with an upgraded digital electronics and data acquisition system. Seven decay chains were observed starting with an evaporation residue, followed by a single $α$ decay and a spontaneous fission. The decay characteristics of these seven decay chains led to an assignment to ${}^{288}{Fl}$ , the product of the $4 n$ reaction channel. Two additional chains were (tentatively) assigned to the decay of the $3 n$ exit channel, ${}^{289}{Fl}$ . Cross sections for the $4 n$ and $3 n$ exit channels were $σ_{prod} = 6.7 (_{25}^{36})$ pb and $σ_{prod} = 1.6 (_{11}^{22})$ pb, respectively. Another decay chain, tentatively assigned to the $5 n$ exit channel through the ${}^{48}{Ca} + {}^{244}{Pu}$ reaction or the $3 n$ exit channel of the ${}^{48}{Ca} + {}^{242}{Pu}$ reaction, was also detected. Detailed information regarding the observed decay chains and their nuclear structure aspects is discussed, along with the performance of the BGS and the new detection system.

Physical Review C

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Investigation of the ${}^{244}{Pu} ({}^{48}{Ca}, x n) {}^{292 - x}{Fl}$ reaction with the LBNL SHREC detector: Investigation of decay chains of isotopes of flerovium ( $Z = 114$ )

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Investigation of the Pu244(Ca48,xn)Fl292−x reaction with the LBNL SHREC detector: Investigation of decay chains of isotopes of flerovium (Z=114)

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Investigation of the ${}^{244}{Pu} ({}^{48}{Ca}, x n) {}^{292 - x}{Fl}$ reaction with the LBNL SHREC detector: Investigation of decay chains of isotopes of flerovium ( $Z = 114$ )