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Register a new userRadiation Background Studies for 0$ ubetabeta$ decay in $^{124}$Sn
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Radiation background studies pertaining to $0 ubetabeta$ decay in $^{124}$Sn have been carried out. A TiLES setup has been installed at TIFR for this purpose. Neutron-induced background is studied in the TIN.TIN detector materials using fast neutron activation technique. The neutron flux ($E_nleq15$ MeV) resulting from SF and ($alpha, n$) interactions for the rock in the INO cavern is estimated using MC simulations. A two layer composite shield of borated paraffin (20 cm) + Pb (5 cm) is proposed for the reduction of neutron flux.
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We report a study of the CUORE sensitivity to neutrinoless double beta ($0 ubetabeta$) decay. We used a Bayesian analysis based on a toy Monte Carlo (MC) approach to extract the exclusion sensitivity to the $0 ubetabeta$ decay half-life ($T_{1/2}^{0 u}$) at $90%$ credibility interval (CI) -- i.e. the interval containing the true value of $T_{1/2}^{0 u}$ with $90%$ probability -- and the $3 sigma$ discovery sensitivity. We consider various background levels and energy resolutions, and describe the influence of the data division in subsets with different background levels. If the background level and the energy resolution meet the expectation, CUORE will reach a $90%$ CI exclusion sensitivity of $2cdot10^{25}$ yr with $3$ months, and $9cdot10^{25}$ yr with $5$ years of live time. Under the same conditions, the discovery sensitivity after $3$ months and $5$ years will be $7cdot10^{24}$ yr and $4cdot10^{25}$ yr, respectively.
CUORE - the Cryogenic Underground Observatory for Rare Events - is an experiment searching for the neutrinoless double-beta ($0 ubetabeta$) decay of $^{130}$Te with an array of 988 TeO$_2$ crystals operated as bolometers at $sim$10 mK in a large dilution refrigerator. With this detector, we aim for a $^{130}$Te $0 ubetabeta$ decay half-life sensitivity of $9times10^{25}$ y with 5 y of live time, and a background index of $lesssim 10^{-2}$ counts/keV/kg/y. Making an effort to maintain radiopurity by minimizing the bolometers exposure to radon gas during their installation in the cryostat, we perform all operations inside a dedicated cleanroom environment with a controlled radon-reduced atmosphere. In this paper, we discuss the design and performance of the CUORE Radon Abatement System and cleanroom, as well as a system to monitor the radon level in real time.
The AMoRE (Advanced Mo-based Rare process Experiment) project is a series of experiments that use advanced cryogenic techniques to search for the neutrinoless double-beta decay of mohundred. The work is being carried out by an international collaboration of researchers from eight countries. These searches involve high precision measurements of radiation-induced temperature changes and scintillation light produced in ultra-pure Mo[100]-enriched and Ca[48]-depleted calcium molybdate ($mathrm{^{48depl}Ca^{100}MoO_4}$) crystals that are located in a deep underground laboratory in Korea. The mohundred nuclide was chosen for this zeronubb decay search because of its high $Q$-value and favorable nuclear matrix element. Tests have demonstrated that camo crystals produce the brightest scintillation light among all of the molybdate crystals, both at room and at cryogenic temperatures. $mathrm{^{48depl}Ca^{100}MoO_4}$ crystals are being operated at milli-Kelvin temperatures and read out via specially developed metallic-magnetic-calorimeter (MMC) temperature sensors that have excellent energy resolution and relatively fast response times. The excellent energy resolution provides good discrimination of signal from backgrounds, and the fast response time is important for minimizing the irreducible background caused by random coincidence of two-neutrino double-beta decay events of mohundred nuclei. Comparisons of the scintillating-light and phonon yields and pulse shape discrimination of the phonon signals will be used to provide redundant rejection of alpha-ray-induced backgrounds. An effective Majorana neutrino mass sensitivity that reaches the expected range of the inverted neutrino mass hierarchy, i.e., 20-50 meV, could be achieved with a 200~kg array of $mathrm{^{48depl}Ca^{100}MoO_4}$ crystals operating for three years.
A pulse-shape discrimination method based on artificial neural networks was applied to pulses simulated for different background, signal and signal-like interactions inside a germanium detector. The simulated pulses were used to investigate variations of efficiencies as a function of used training set. It is verified that neural networks are well-suited to identify background pulses in true-coaxial high-purity germanium detectors. The systematic uncertainty on the signal recognition efficiency derived using signal-like evaluation samples from calibration measurements is estimated to be 5%. This uncertainty is due to differences between signal and calibration samples.
The GERDA collaboration is performing a search for neutrinoless double beta decay of ^{76}Ge with the eponymous detector. The experiment has been installed and commissioned at the Laboratori Nazionali del Gran Sasso and has started operation in November 2011. The design, construction and first operational results are described, along with detailed information from the R&D phase.
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