 In 1944 Richard Feynman recruited Reines to work in the Theoretical Division at the Manhattan Project 's Los Alamos Laboratory , where he would remain for the next fifteen years . He joined Feynman 's T @-@ 4 ( Diffusion Problems ) Group , which was part of Hans Bethe 's T ( Theoretical ) Division . Diffusion was an important aspect of critical mass calculations . In June 1946 , he became a group leader , heading the T @-@ 1 ( Theory of Dragon ) Group . An outgrowth of the " tickling the Dragon 's tail " experiment , the Dragon was a machine that could attain a critical state for short bursts of time , which could be used as a research tool or power source . 
 In 1944 Richard Feynman recruited Reines to work in the Theoretical Division at the Manhattan Project <a href='null_genetive' title='1'><mark>'s</mark></a>Los Alamos Laboratory , where he would remain for the next fifteen years . He joined Feynman <a href='null_genetive' title='2'><mark>'s</mark></a>T @-@ 4 ( Diffusion Problems ) Group , which was part of Hans Bethe <a href='null_genetive' title='3'><mark>'s</mark></a>T ( Theoretical ) Division . Diffusion was an important aspect of critical mass calculations . In June 1946 , he became a group leader , heading the T @-@ 1 ( Theory of Dragon ) Group . An outgrowth of the " tickling the Dragon <a href='null_genetive' title='4'><mark>'s</mark></a>tail " experiment , the Dragon<a href='been_done' title='5'><mark></mark></a> was a machine <a href='null_relcl' title='6'><mark>that</mark></a>could attain a critical state for short bursts of time , which could be used as a research tool or power source . 
In 1944 Richard Feynman recruited Reines to work in the Theoretical Division at the Manhattan Project  Los Alamos Laboratory , where he would remain fa the next fifteen years . He joined Feynman  T @-@ 4 ( Diffusion Problems ) Group , which was part of Hans Bethe  T ( Theoretical ) Division . Diffusion was an important aspect of critical mass calculations . In June 1946 , he became a group leader , heading the T @-@ 1 ( Theory of Dragon ) Group . An outgrowth of the " tickling the Dragon  tail " experiment , the Dragon been was a machine could attain a critical state ffashort bursts of time , which could b used as a research tool or power source .