2010 update on the ROSEBUD Project

2010 update on the ROSEBUD Project. N. Coron, J. Gironnet, P. de Marcillac, M. Martínez, T. Redon, L. Torres, C. Cuesta, E. García, C. Ginestra, Y. Ortigoza∗, A. Ortiz de Solórzano, C. Pobes, J. Puimedón, T. Rolón, A. Salinas, M.L. Sarsa, J.A. Villar. PoS(IDM2010)054

The ROSEBUD (Rare Objects SEarch with Bolometers UndergrounD) Collaboration has tested
scintillating bolometers of BGO (Bi4Ge3O12), 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 b =g background. 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.