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Deuteron evaporation from N=Z compound nuclei

Y. Hrabar1,*, P. Golubev1, A. Idini1, L. G. Sarmiento1, B. G. Carlsson1, C. Müller-Gatermann2, W. Reviol2, D. Rudolph1, D. Seweryniak2 et al.

J. Wu2,†, H. M. Albers3, J. T. Anderson2, M. A. Bentley4, M. P. Carpenter2, C. J. Chiara5, P. A. Copp2,‡, D. M. Cox1, C. Fahlander1, U. Forsberg1,§, T. Huang2,∥, H. Jayatissa2,‡, T. Lauritsen2, S. F. D. McCaughley1, X. Pereira-Lopez4,¶, I. Ragnarsson1, S. Stolze2, S. Uthayakumaar4,#, and G. L. Wilson2,6,**

  • *Contact author: yuliia.hrabar@fysik.lu.se
  • †Present affiliation: Brookhaven National Laboratory, Brookhaven, USA.
  • ‡Present affiliation: Physics Division, Los Alamos National Laboratory, Los Alamos, USA.
  • §Present affiliation: Cyclife Sweden AB, Nyköping, Sweden.
  • ∥Present affiliation: Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
  • Present affiliation: Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon, Republic of Korea.
  • #Present affiliation: Facility for Rare Isotope Beams, Michigan State University, East Lansing, USA.
  • **Present affiliation: United Kingdom Atomic Energy Authority, Abingdon, United Kingdom.
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Phys. Rev. C 111, 064619 – Published 20 June, 2025

DOI: https://doi.org/10.1103/w465-w3zz

Abstract

Deuteron evaporation was observed from the N=Z compound nuclei Fe★52, Ni★56, and Ge★64 in an experiment conducted at Argonne National Laboratory, USA. The experiment included a novel combination of two highly pixelated double-sided Si-strip detectors inside the Microball charged-particle detection array, allowing for unequivocal discrimination of evaporated deuterons from protons and α particles. In conjunction with the Gammasphere array, Neutron Shell, and additional ancillary detectors, decay paths into various residual nuclei were investigated. The study provides insights into the competition of deuteron vs proton-neutron evaporation as a function of available excitation energy and populated angular momentum. Results are interpreted using a statistical evaporation formalism for multiple subsequent particle emissions. The decisive factor in the comparison appears to be the available excitation energy in the residual system, with single nucleon evaporation preferred over deuteron evaporation for higher excitation energies.

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Phys. Rev. C 111, 064619– Published 20 June, 2025
  • Received 7 February 2025
  • Accepted 7 May 2025
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