Out of curiosity, is there a periodicity in the plot that's ~0.3
MeV "long"? It's most obvious at 4-5 MeV, but I can see it from 1
MeV to almost 6 MeV.
On 3/13/19 10:41 AM, Jody Wilson
wrote:
Hi
CRaTER folks,
A "work in progress" panel that I'll include in my LPSC poster
next week is a ratio of the whole-mission *mare* LET spectrum to
the *highlands* LET spectrum. The idea is that mare-rich
elements should make positive spectral features in this ratio,
while highlands-rich elements should produce dips in the ratio.
New since I last addressed this:
1) Wouter pointed out that gamma ray Compton edges should be
more prominent in our data than the primary spectral lines,
since CRaTER is not at all optimized to collect all of the
energy from a given gamma ray photon. So I'm only labeling the
energies of the Compton edges now.
2) Andrew and Wouter have been searching for new methods of
normalizing CRaTER data for making maps using combinations of
singles rates and the "linger time" of LRO over the Moon. Along
the way Andrew discovered that the lunar map of the raw D4
singles rate looks kind of similar to the SEPI map (ditto the
raw D6 singles rate map), which means that whatever is lighting
up the highlands in the SEPI map is registering in D4 as well as
D6. Therefore in the above plot I've used the mare/highlands
ratio from both D4 and D6 to improve the signal.
Notes:
Silicon and oxygen should make the brightest features due to
their high overall abundance, but they're almost as abundant in
the mare as the highlands, so they should basically cancel out
in this ratio, and therefore I'm not labeling them.
_______________________________________________
Crater-team mailing list
Crater-team@lists.sr.unh.edu
https://lists.sr.unh.edu/mailman/listinfo/crater-team