Experimental study of isospin transport with $^{40,48}$Ca+ $^{40,48}$Ca reactions at 35 MeV/nucleon - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles (Preprint) Physical Review C Year : 2023

Experimental study of isospin transport with $^{40,48}$Ca+ $^{40,48}$Ca reactions at 35 MeV/nucleon

Q. Fable
A. Chbihi
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E. Vient

Abstract

We investigate the isospin transport with 40,48 Ca+ 40,48 Ca reactions at 35 MeV/nucleon, measured with the coupling of the VAMOS high acceptance spectrometer and the INDRA charged particle multidetector. Using the quasi-projectile remnant measured with VAMOS and carefully selected light-charged-particles measured in coincidence with INDRA, a reconstruction method is applied to estimate the excited quasi-projectile (QP) on an event-by-event basis. The isospin diffusion is investigated using the isospin transport ratio with the asymmetry δ = (N − Z)/A of the projectile as an isospin-sensitive observable and the total transverse energy of Z ≤ 2 nuclei for experimental centrality sorting. The experimental isospin transport ratios present, for both the reconstructed QP and its remnant, a clear evolution towards isospin equilibration with increasing dissipation of the collision while the full equilibration is not reached. A smoother evolution with less discrepancies between the two mixed systems in the case of the reconstructed QP is also observed. The isospin migration is investigated using the neutron-to-proton ratio of the light-charged-clusters and the velocity of the QP remnant as a sorting parameter. More particularly, we focused on an angular region centered around the mid-rapidity of the reaction so as to characterize the low-density neck emissions. A systematic neutron-enrichment is observed and interpreted as a consequence of isospin migration, more particularly for the symmetric systems which present no isospin gradient between the projectile and the target. We also noticed that the ^{2}H and ^{4}He particles exhibit very close multiplicities independently of the sorting variable for the symmetric systems.
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Origin : Files produced by the author(s)
Origin : Files produced by the author(s)
Origin : Files produced by the author(s)
Origin : Files produced by the author(s)
Origin : Files produced by the author(s)

Dates and versions

in2p3-03832816 , version 1 (28-10-2022)
in2p3-03832816 , version 2 (24-01-2023)

Identifiers

Cite

Q. Fable, A. Chbihi, J.D. Frankland, P. Napolitani, G. Verde, et al.. Experimental study of isospin transport with $^{40,48}$Ca+ $^{40,48}$Ca reactions at 35 MeV/nucleon. Physical Review C, 2023, 107 (1), pp.014604. ⟨10.1103/PhysRevC.107.014604⟩. ⟨in2p3-03832816v2⟩
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