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Massive and massless modes of the triplet phase of neutron matter

Neutron matter at densities on the order of the nuclear saturation density is believed to have neutrons paired in the 3 P 2 channel. We study the low-lying modes of this phase and find two massless modes (angulons), resulting from the spontaneous breaking of rotational symmetry as well as three other gapped modes. Here, we compute their masses at arbitrary temperatures.

Bedaque, Paulo F.↗

β -decay Q values among the A = 50 Ti-V-Cr isobaric triplet and atomic masses of Ti 46 , 47 , 49 , 50 , V 50 , 51 , and Cr 50 , 52 – 54

This manuscript describes a measurement of the Q value for the highly forbidden beta-decays of 50 V and the double electron capture decay of 50 Cr. The Q value corresponds to the total energy released during the decay and is equivalent to the mass difference between parent and daughter atoms. This mass difference was measured using high precision Penning trap mass spectrometry with the Low Energy Beam and Ion Trap facility at the National Superconducting Cyclotron Laboratory. The Q value enters into theoretical calculations of the half-life and beta-decay spectrum for the decay, so improves these calculations. In addition the Q value corresponds to the end point energy of the beta-decay spectrum, which has been precisely measured for several highly-forbidden decays using modern low background detector techniques. Hence, our Q value measurements provide a test of systematics for these detectors. In addition, we have measured the absolute atomic masses of 46,47,49,50 Ti, 50,51 V, and 50,52-52 Cr, providing improvements in precision by factors of up to 3. These atomic masses help to strengthen global evaluations of all atomic mass data, such as the Atomic Mass Evaluation.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗