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Updated: Jul 11, 2026

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

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Observation of a (6)(LambdaLambda)He double hypernucleus.

H Takahashi¹, J K Ahn, H Akikawa

¹Department of Physics, Kyoto University, Kyoto 606-8502, Japan. thitoshi@nh.scphys.kyoto-u.ac.jp

Physical Review Letters

|December 12, 2001

Summary

Researchers observed a rare double-hyperfragment event, uniquely identifying the sequential decay of Helium-6 Lambda Lambda. This study provides the first unambiguous measurement of the Lambda-Lambda interaction energy, confirming a weak attraction.

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Area of Science:

Nuclear Physics
Particle Physics
Hypernuclear Physics

Background:

Hypernuclei, such as Helium-6 Lambda Lambda, are exotic atomic nuclei containing hyperons.
Understanding the interactions between hyperons is crucial for comprehending nuclear forces.

Purpose of the Study:

To uniquely identify and characterize a double-hyperfragment event involving Helium-6 Lambda Lambda.
To measure the Lambda-Lambda interaction energy (DeltaB(LambdaLambda)) for the first time without ambiguity from excited states.

Main Methods:

Utilized a hybrid-emulsion experiment to detect and analyze the decay products.
Identified the event as the sequential decay of Helium-6 Lambda Lambda originating from a Xi(-) hyperon nuclear capture at rest.

Main Results:

Successfully measured the mass of Helium-6 Lambda Lambda.
Determined the Lambda-Lambda interaction energy DeltaB(LambdaLambda) to be 1.01+/-0.20(+0.18)(-0.11) MeV.
This measurement is the first devoid of ambiguities related to potential excited states.

Conclusions:

The measured Lambda-Lambda interaction energy confirms that the Lambda-Lambda interaction is weakly attractive.
This finding contributes to a deeper understanding of the fundamental forces within hypernuclei.