{"action":"closed","issue":{"url":"https://api.github.com/repos/mantidproject/mantid/issues/15843","repository_url":"https://api.github.com/repos/mantidproject/mantid","labels_url":"https://api.github.com/repos/mantidproject/mantid/issues/15843/labels{/name}","comments_url":"https://api.github.com/repos/mantidproject/mantid/issues/15843/comments","events_url":"https://api.github.com/repos/mantidproject/mantid/issues/15843/events","html_url":"https://github.com/mantidproject/mantid/issues/15843","id":146275233,"number":15843,"title":"Python algorithm to calculate the phonon density of states from powder inelastic data","user":{"login":"mducle","id":14106963,"avatar_url":"https://avatars.githubusercontent.com/u/14106963?v=3","gravatar_id":"","url":"https://api.github.com/users/mducle","html_url":"https://github.com/mducle","followers_url":"https://api.github.com/users/mducle/followers","following_url":"https://api.github.com/users/mducle/following{/other_user}","gists_url":"https://api.github.com/users/mducle/gists{/gist_id}","starred_url":"https://api.github.com/users/mducle/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mducle/subscriptions","organizations_url":"https://api.github.com/users/mducle/orgs","repos_url":"https://api.github.com/users/mducle/repos","events_url":"https://api.github.com/users/mducle/events{/privacy}","received_events_url":"https://api.github.com/users/mducle/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/mantidproject/mantid/labels/Component:%20Direct%20Inelastic","name":"Component: Direct Inelastic","color":"009800"}],"state":"closed","locked":false,"assignee":{"login":"abuts","id":1109606,"avatar_url":"https://avatars.githubusercontent.com/u/1109606?v=3","gravatar_id":"","url":"https://api.github.com/users/abuts","html_url":"https://github.com/abuts","followers_url":"https://api.github.com/users/abuts/followers","following_url":"https://api.github.com/users/abuts/following{/other_user}","gists_url":"https://api.github.com/users/abuts/gists{/gist_id}","starred_url":"https://api.github.com/users/abuts/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/abuts/subscriptions","organizations_url":"https://api.github.com/users/abuts/orgs","repos_url":"https://api.github.com/users/abuts/repos","events_url":"https://api.github.com/users/abuts/events{/privacy}","received_events_url":"https://api.github.com/users/abuts/received_events","type":"User","site_admin":false},"milestone":{"url":"https://api.github.com/repos/mantidproject/mantid/milestones/5","html_url":"https://github.com/mantidproject/mantid/milestones/Release%203.7","labels_url":"https://api.github.com/repos/mantidproject/mantid/milestones/5/labels","id":1106939,"number":5,"title":"Release 3.7","description":"Code Freeze:13-May-2016\r\nBeta Testing: 17-May-2016 to 31-May-2016\r\n","creator":{"login":"peterfpeterson","id":404003,"avatar_url":"https://avatars.githubusercontent.com/u/404003?v=3","gravatar_id":"","url":"https://api.github.com/users/peterfpeterson","html_url":"https://github.com/peterfpeterson","followers_url":"https://api.github.com/users/peterfpeterson/followers","following_url":"https://api.github.com/users/peterfpeterson/following{/other_user}","gists_url":"https://api.github.com/users/peterfpeterson/gists{/gist_id}","starred_url":"https://api.github.com/users/peterfpeterson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/peterfpeterson/subscriptions","organizations_url":"https://api.github.com/users/peterfpeterson/orgs","repos_url":"https://api.github.com/users/peterfpeterson/repos","events_url":"https://api.github.com/users/peterfpeterson/events{/privacy}","received_events_url":"https://api.github.com/users/peterfpeterson/received_events","type":"User","site_admin":false},"open_issues":590,"closed_issues":694,"state":"open","created_at":"2015-05-12T15:38:13Z","updated_at":"2016-05-05T15:11:17Z","due_on":"2016-06-05T23:00:00Z","closed_at":null},"comments":8,"created_at":"2016-04-06T10:58:41Z","updated_at":"2016-05-05T15:11:17Z","closed_at":"2016-05-05T15:11:17Z","body":"It would be useful to have an algorithm to compute the (neutron weighted) density of states from S(q,w) in the incoherent approximation (from e.g. Skold and Price, Neutron Scattering, eqn. 1.70 http://bit.ly/1PTuc6a )\r\n\r\nZ(E) \\propto S(Q,E) / (Q^2/E) / exp(-2W) / <n+1>\r\n\r\nfor neutron energy loss; <n+1> should be <n> for neutron energy gain, with <n+1> = 1/(exp[E/kT]-1)+1, and <n> = 1/(exp[E/kT]).\r\n\r\nThis would be useful in lattice dynamics measurements in powder / polycrystalline samples, e.g. on Mari. "}}