id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ap-1991	Ferroni, Fernando	NEUTRINOLESS DOUBLE BETA DECAY: AN EXTREME CHALLENGE	2013	3	.pdf	application/pdf	1723	109	60	The problem The challenge is in the very fact that the sensitivity of this kind of experiment, as previously seen, improves only with the square root of the selected isotope mass, running time, decrease of background index and im- provement of energy resolution. Also background level (b) and energy resolution (ΔE) behaves as a square root.	cache/ap-1991.pdf	txt/ap-1991.txt