Good question JOS!
First what do I mean by "meaning". Not "intention " or translation. It is what I value in life. What I work for, treasure or care about! It could be I care a lot about my children and their lives after I die. I should care about the whole ecosystem I am in and depend on for my sustenance. My friends I have nurtured relationships with. The smell of a particular flower or walks in the woods. Meaning in life for me has to do with my attachments. If I were Buddhist I might be attached to giving up my attachments. :} Oh the loneliness of giving up dualism and just being one with everything. (That's another thread).
This "way of life" does not have to just be given up when our bodies die. I am asserting that our soul or essence (stored values/meaning) come from before the big bang and we continue adding to that reservoir in each new life.
What part does a neutron/proton play? It just so happens that those tiny objects were once the centers of galaxies before the big Crunch Big Bang. The ancient civilizations that orbited them are as small to them as we are small to the black hole centers of our galaxy. I calculated the size of a civilizations ecosystem/solar system to be a planc volume. Much smaller than a neutron. That is a resolution just big enough to measure. Any smaller and it disappears into the quantum units like the space between the pixels on your TV.