gamma_total_intensity method returns nan

[rtesse]

Describe the Bug

I am studying the decay of the Co-60 and I would like to have the total intensities of the gamma rays. I read in the documentation that the method pyne.data.gamma_total_intensity do that. However, it returns a list of nan. Is this the correct method to use ?

To Reproduce

import pyne
pyne.data.gamma_total_intensity(pyne.nucname.id('Co60'))

Expected Behavior

I would expect a non-nan array.

Screenshots or Code Snippets

Please complete the following information regarding your system:

• OS: Linux
• PyNE 0.7.5

[welcome]

Hi, and welcome to PyNE! 👋 Thanks for opening your first issue. We recommend that you include information such as the version of PyNE you're working with (eg, develop branch or a specific version), the platform you are operating on, the expected behavior, and the actual behavior you are bringing our attention to. The more deatil you provide, the better others in this community will be able to help you.

[ahnaf-tahmid-chowdhury]

It appears that the data you are looking for is not readily available. I attempted to find information on U235 and Pu-239, but encountered some incomplete values that included null values.