Method to evidence hypernuclear halos from a two-target interaction cross section measurement

Simone Velardita*, Hector Alvarez-Pol, Thomas Aumann, Yassid Ayyad, Meytal Duer, Hans Werner Hammer, Liancheng Ji, Alexandre Obertelli, Yelei Sun

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We present a two-target measurement method to determine the interaction cross section of hypernuclei with a target nucleus. The method allows to extract from two independent measurements the production cross section of a given hypernucleus as well as its interaction cross section on a specific target. The latter is then further analyzed to deduce the matter radius of the hypernucleus. The sensitivity of the method has been investigated for the specific case of the lightest hyperhalo candidate hypertriton (Λ3 H) produced from 12 C+ 12 C collisions at 1.9 GeV/nucleon. Furthermore, its feasibility is demonstrated by detailed simulations for realistic experimental conditions at GSI/FAIR, using a dedicated HYDRA (HYpernuclei Decay at R 3 B Apparatus) time-projection chamber prototype. A precision of 15% or better in the interaction cross section can be achieved, allowing an extraction of the unknown Λ3 H matter radius and assessing its halo or non-halo character.

Original languageEnglish
Article number139
JournalEuropean Physical Journal A
Issue number6
StatePublished - Jun 2023
Externally publishedYes


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