2010 update on the ROSEBUD project

Abstract

The ROSEBUD (Rare Objects SEarch with Bolometers UndergrounD) Collaboration has tested scintillating bolometers of BGO (Bi4Ge3O 12), Al2O3 and LiF in a common experimental set-up in an ultralow background environment at the Canfranc Underground Laboratory. We present the new results of a recent analysis of the data obtained. The BGO heat and light response to different particles has been measured, focusing on its capability for nuclear recoils discrimination against the β/γbackground. A comparison of BGO sensitivity with that of other targets used or proposed in direct dark matter searches is discussed. We also have analyzed the simultaneous use of LiF and Al2O3 scintillating bolometers to monitor the fast neutron flux inside the experimental shielding. Monte Carlo simulations of the recoils induced in Al2O3 by fast neutrons are presented. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.