S.J. Greene

Imaging Fukushima Daiichi reactors with muons

A study of imaging the Fukushima Daiichi reactors with cosmic-ray muons to assess the damage to the reactors is presented. Muon scattering imaging has high sensitivity for detecting uranium fuel and debris even through thick concrete walls and a reactor pressure vessel. Technical demonstrations using a reactor mockup, detector radiation test at Fukushima Daiichi, and simulation studies have been carried out. These studies establish feasibility for the reactor imaging. A few months of measurement will reveal the spatial distribution of the reactor fuel. The muon scattering technique would be the best and probably the only way for Fukushima Daiichi to make this determination in the near future.

Systematics of pion double-charge-exchange reactions on T = 0 nuclei

Abstract Pion induced double charge exchange on 12 C, 16 O, 24 Mg, 28 Si, 32 S, and 40 Ca exhibits forward-angle cross sections that vary rapidly with pion energy and fall off roughly as A −4 3 . Angular distributions at 164 MeV appear diffractive for targets of 12 C, 16 O, and 40 Ca.

Diffractive angular distribution for /sup 16/O(. pi. /sup +/,. pi. /sup -/)/sup 16/Ne(g. s. )

The 164-MeV angular distribution for the non-analog double charge exchange reaction /sup 16/O(..pi../sup +/, ..pi../sup -/)/sup 16/Ne(g.s.) has been measured and is found to be basically diffractive. This is contrasted with the previously measured analog distribution /sup 18/O(..pi../sup +/, ..pi../sup -/)/sup 18/Ne (double isobaric analog) which is not diffractive.