Robert Grzywacz

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The Nab collaboration will perform a precise measurement of a, the electron-neutrino correlation parameter, and b, the Fierz interference term in neutron beta decay, in the Fundamental Neutron Physics Beamline at the SNS, using a novel electric/magnetic field spectrometer and detector design. The experiment is aiming at the 10 −3 accuracy level in ∆a/a, and(More)
We propose to perform a precise measurement of a, the electron-neutrino correlation parameter, and b, the Fierz interference term in neutron beta decay, in the Fundamental Neutron Physics Beamline at the SNS, using a novel electric/magnetic field spectrometer and detector design. The experiment is aiming at the 10 −3 accuracy level in ∆a/a, and will provide(More)
In an experiment performed at the GSI Fragment Sep-arator (FRS) in July 2001, the decay of 45 Fe has been investigated in order to establish whether it proceeds by simultaneous emission of two protons from the ground state, as suggested by theoretical predictions [1, 2], or by conventional β + decay. This extremely neutron-deficient nucleus was produced in(More)
a r t i c l e i n f o a b s t r a c t The complete three-body correlation pictures are experimentally reconstructed for the two-proton decays of the 6 Be and 45 Fe ground states. We are able to see qualitative similarities and differences between these decays. They demonstrate very good agreement with the predictions of a theoretical three-body cluster(More)
Fine structure in proton emission from the 7/2 − [523] ground state and from the 1/2 + [411] isomer in deformed nucleus 141 Ho was studied by means of fusion-evaporation reactions and digital signal processing. Proton transitions to the first excited 2 + state in 140 Dy, with the branching ratio of I gs p (2 +)=0.9±0.2% and I m p (2 +)=1.7±0.5%, were(More)
The Versatile Array of Neutron Detectors at Low Energy (VANDLE) is a new array of plastic scintillator bars under development for measurements at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. The array is highly modular allowing the configuration of the individual elements to be optimized for particular experimental(More)
A systematic study of the population probabilities of microsecond isomers produced following the fragmentation of 208 Pb projectiles at 1 GeV/nucleon has been undertaken at the SIS/FRS facility at GSI Darmstadt. Gamma decays from approximately 20 isomeric states, mainly in the rare-earth and transitional nuclei with Aϳ180, were identified and the(More)
The neutron-deficient nucleus 107 Sn has been studied by using the one-neutron knockout reaction. By measuring the decay γ rays and momentum distributions of reaction residues, the spins of the ground, 5/2 + , and first-excited, 7/2 + , states of 107 Sn have been assigned by comparisons to eikonal-model reaction calculations. Limits on the inclusive and(More)