The ZnWO$_4$ is an anisotropic crystal scintillator; for its peculiar characteristics, it is a very promising detector to exploit the so-called directionality approach in the investigation of those Dark Matter (DM) candidates inducing nuclear recoils. Recently, in the framework of the ADAMO project, an R\&D to develop high quality and ultra-radiopure ZnWO$_4$ crystal scintillators has been carried out. In the present paper the measurements to study the anisotropic response of a ZnWO$_4$ to $\alpha$ particles and to nuclear recoils induced by neutron scattering are reported. Monochromatic neutrons have been produced by a neutron generator at ENEA-CASACCIA. The quenching factor values for nuclear recoils along different crystallographic axes have been determined for three different nuclear recoils energies. These results open the possibility to realize a pioneer experiment to investigate the above mentioned DM candidates by means of the directionality.

中文翻译：

---

射线纯 ZnWO4 各向异性闪烁体的发展和改进

ZnWO$_4$为各向异性晶体闪烁体；由于其独特的特性，利用所谓的方向性方法来研究诱导核反冲的暗物质 (DM) 候选者是一种非常有前途的探测器。最近，在 ADAMO 项目的框架内，已经进行了开发高质量和超辐射纯 ZnWO$_4$ 晶体闪烁体的研发。在本文中，报告了研究 ZnWO$_4$ 对 $\alpha$ 粒子和对中子散射引起的核反冲的各向异性响应的测量。单色中子已由 ENEA-CASACCIA 的中子发生器产生。已经为三种不同的核反冲能量确定了沿不同晶轴的核反冲的淬灭因子值。