B Light element abundances for He3/H?

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The discussion centers on the Schram plot, which illustrates the observed and predicted abundances of light elements relevant to the cosmological lithium problem. The absence of the yellow box for He3/H indicates a lack of direct observational data for this ratio, primarily due to the challenges in measuring He3, a rare helium isotope. He3's abundance is influenced by various astrophysical processes, complicating its quantification. While other light elements like lithium and deuterium have established measurements, He3 remains uncertain and is not represented in the Schram plot. Future advancements in research and technology may improve the accuracy of He3 abundance measurements, aiding in the understanding of the cosmological lithium problem.
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I'm trying to understand the Schram plot, which is the graph of wiki here: https://en.wikipedia.org/wiki/Cosmological_lithium_problem
I do not understand why the yellow box (the observed light element abundance) for H3/H (red stripe) is absent? Is there any reason for this?

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The light element abundance for He3/H is an important parameter in understanding the Schram plot and the cosmological lithium problem. The Schram plot is a graph that compares the observed abundances of light elements, such as lithium, helium, and deuterium, with the predictions of Big Bang nucleosynthesis.

The yellow box in the Schram plot represents the observed abundances of light elements, and the red stripe represents the predicted abundances based on Big Bang nucleosynthesis. The absence of the yellow box for He3/H indicates that there is currently no direct observational data for this ratio.

This is due to the difficulty in measuring the abundance of He3 in the universe. He3 is a rare isotope of helium and is not as abundant as He4. The abundance of He3 in the universe is also affected by various astrophysical processes, such as stellar nucleosynthesis and cosmic ray interactions.

Therefore, while the observed abundances of other light elements, such as lithium and deuterium, have been measured and are included in the yellow box, the abundance of He3 is still uncertain and is not included in the Schram plot. However, ongoing research and advancements in technology may provide more accurate measurements of the He3 abundance in the future, which could help to further understand the cosmological lithium problem.
 
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