  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.
