The MORA project

Abstract

The MORA (Matter's Origin from the RadioActivity of trapped and oriented ions) project aims at measuring with unprecedented precision the D correlation in the nuclear beta decay of trapped and oriented ions. The Ee P even T even Beta asymmetry A β · J J · pe Ee P odd T even Neutrino asymmetry B ν · J J · pν Eν P odd T even D correlation D · J J · pe Ee × pν Eν P even T odd tum, and total energy, p ν , E ν the momentum and energy of the neutrino, and J the spin of the nucleus. P stands for the parity transformation, T for time reversal. The correlations with capital letters refer to nuclei of oriented spin, while the Fierz interference term b and the β − ν angular correlation parameter a βν are also encountered in decays of non-oriented nuclei. Other types of correlations appear when measuring the polarization of electrons or positrons, for example the triple R correlation, of the form R σ · J J × pe Ee .LPCTrap presently permits a measurement of the beta neutrino angular correlation a βν , which does not require any polarization, to an aimed precision of 0.5%. In principle, the MORA trapping and detection setup will enable the measurement of the a βν , A β , B ν correlations, in addition to D. Although not considered in the framework of MORA for the search of NP, these correlations can provide important information on the parameters of the ion cloud. In particular, we intend to monitor the polarization degree via the measurement of the A β and B ν correlations, as developed in section 4.

Opportunities for Fundamental Physics Research with Radioactive Molecules

“…Lastly, the IGISOL facility hosts an atom trap dedicated for trapping of radioactive Cs isotopes and isomers (Giatzoglou et al, 2018). In 2022 the MORA experiment was installed, a trap-based experiment to search for a signature of CP violation in the nuclear beta decay of radioactive nuclei produced at IGISOL (Delahaye et al, 2019). 4.5.2.…”

RAPTOR: a new collinear laser ionization spectroscopy and laser-radiofrequency double-resonance experiment at the IGISOL facility

“…Time-Of-Flight mass spectrometer), MORA [8] (Matter's Origin from the RadioActivity of trapped and oriented ions setup), and the double Penning trap JYFLTRAP [9]. RAPTOR is installed directly downstream from the RFQ and connects to the JYFLTRAP line.…”

Detection of recoil ion in the beta decay of laser oriented trapped radioactive isotopes for the MORA Project

“…The mora experiment [1] is searching for evidence of cp-violation in the nuclear beta decay of trapped and oriented 23 M g + and 39 Ca + ions. The employed detection setup uses an emit [2] experiment-like configuration which alternates every 45 degrees, there is a dedicated detection system for beta particles and recoil ions emitted during the decay of the isotope of interest.…”