Theoretical predictions of wimp-nucleus and neutrino-nucleus scattering in context of dark matter direct detection
The nature of dark matter is at present an open question. Assuming the main component of dark matter consists of weakly interacting massive particles (WIMPs), directly detecting such particle via a scattering process with an atomic nucleus would be a strong probe into properties of dark matter. So far direct detection experiments have not provided a conclusive signal of dark matter. Traditionally the experiments aim to detect a coherent, spin- independent, elastic scattering signal which is enhanced by the square of the nuclear mass number. If the coherent channel is for some reason suppressed for WIMP-nucleus interactions, then spin-dependent interactions become important. In this thesis we focus on spin-dependent interactions of WIMPs scattering oﬀ two possible detector nuclei 83Kr and 125Te. These nuclei are particularly interesting for inelastic scattering due to their very low-lying ﬁrst excited states. The nuclear structure of the target nuclei was computed within the nuclear shell model. Our analysis shows that, although the 9.4 keV excited state of 83Kr has some kinematical advantages, the obtained elastic and inelastic scattering event rates do not encourage to build a detector based on 83Kr. On the other hand, 125Te appears to possess nuclear structure very sensitive to spin-dependent interactions based on the results presented in this thesis. A detector based on 125Te might open some new possibilities especially for inelastic scattering searches. With increasing size and sensitivity direct detection experiments will soon become sensitive to coherent scattering of astrophysical neutrinos. This gives rise to the problem commonly referred to as the neutrino ﬂoor, which will prevent the experiments probing lower WIMP-nucleon cross sections after the neutrino background becomes visible in the data. In this thesis we present the ﬁrst calculations of neutrino-nucleus scattering cross sections in a microscopic nuclear framework for most of the stable Xe isotopes. We perform the nuclear structure calculations in the framework of the (proton-neutron) quasiparticle random-phase approximation ((pn)QRPA) for states of even-mass nuclei and in the microscopic quasiparticle-phonon model for states of odd-mass nuclei. We present results for the total cross sections for neutral-current and charged-current processes as a function of the neutrino energy as well as for the solar 8B neutrino and supernova neutrino and antineutrino proﬁles. This thesis consists of ﬁve publications and an overview part. Articles I–III discuss WIMPs scattering oﬀ 83Kr and 125Te and articles IV and V discuss neutrino-nucleus scattering in context of Xe dark matter detectors. In the overview part the theoretical formalism and results of all ﬁve publications are drawn together in a coherent and concise manner. ...
PublisherUniversity of Jyväskylä
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Pirinen, Pekka; Suhonen, Jouni; Ydrefors, E. (Hindawi, 2018)Large liquid xenon detectors aiming for dark matter direct detection will soon become viable tools also for investigating neutrino physics. Information on the effects of nuclear structure in neutrino-nucleus scattering can ...
Hellgren, Matti (2020)Tutkielmassa tarkasteltiin astrofysikaalisten neutriinojen sirontaa stabiileista jodi- ja caesium ytimistä 127I and 133Cs, tarkoituksena arvioida kyseisten ytimien hyödyntämisen mahdollisuutta neutriinojen havaitsemisessa. ...
Solar neutrino detection in liquid xenon detectors via charged-current scattering to excited states Haselschwardt, Scott; Lenardo, Brian; Pirinen, Pekka; Suhonen, Jouni (American Physical Society (APS), 2020)We investigate the prospects for real-time detection of solar neutrinos via the charged-current neutrino-nucleus scattering process in liquid xenon time projection chambers. We use a nuclear shell model, benchmarked with ...
Kostensalo, Joel; Suhonen, Jouni; Zuber, K. (American Physical Society, 2020)Radiochemical experiments for low-energy solar-neutrino detection have been making headlines by exploiting the isotopes 37Cl and 71Ga. Such a very low-threshold measurement of this type can also be performed using 205Tl, ...
Theoretical Calculations for Electron Spectra and Neutrino-Nucleus Scattering in Context of Reactor Antineutrino and Gallium Anomalies Kostensalo, Joel (2021)This thesis consists of fourteen publications and an introductory part on rare beta decays and neutrino-nucleus scattering. The overarching theme of this work is to provide state-of-the-art theoretical calculations for ...