Angular properties of proton and neutron emission from exotic nuclei.
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 221 (2001) U81-U81
Attenuation of nuclear orientation of In-127 in Gd and the InGd Korringa spin-lattice relaxation time constant
HYPERFINE INTERACT 133:1-4 (2001) 111-115
Abstract:
The nuclear spin-lattice relaxation of In-127 implanted into pure gadolinium metal has been measured using the method of integral attenuation of on-line nuclear orientation. The Korringa constant is determined to be C-K ((InGd)-In-127, B-pol = 0.5 T) = 0.133(18) sK. The result is compared with relaxation of In nuclei in Fe.Quantum barrier penetration studies with oriented nuclei: Proton and neutron emission from exotic isotopes
HYPERFINE INTERACT 136:3 (2001) 143-148
Abstract:
We report a programme of novel experiments involving direct proton emission and beta-delayed proton and neutron emission for exotic nuclei oriented at low temperatures. Full modelling of the quantum tunneling and angular distribution has been made for the first time for these processes. Their study has application in many fields of natural science. The study of barrier effects involving angular momentum and non-spherical deformation can be approached more directly via single-particle emission than via alpha decay, which suffers from complications relating to preformation of the alpha particle. Using the new formalism, predictions are presented for angular distributions of beta-delayed neutrons from oriented I-137 and of direct proton emission from oriented Tm-147.The hyperfine field of selenium in iron and the magnetic dipole moment of Se-75
HYPERFINE INTERACT 133:1-4 (2001) 117-120
Abstract:
New results on the applied field dependence of the NMR of Se-75 implanted in pure iron and oriented at millikelvin temperatures are reported. They yield the magnetic hyperfine field acting on Se nuclei present as dilute impurities in the iron matrix and the magnetic dipole moment of the 5/2(+) ground state of Se-75 with significantly improved precision. The results are B-hf(SeFe) = +67.9(10) T and \mu\(Se-75) = 0.683(10) mu (N). The improved value of the hyperfine field, with data from [2], gives the magnetic dipole moment of the 9/2(+) ground state of Se-73 as \mu\ = 0.892(13) mu (N).First On-line beta-NMR on oriented nuclei: magnetic dipole moments of the (nup(1/2))(-1) 1/2(-) ground state in 67Ni and (pip(3/2))(+1) 3/2(-) ground state in 69Cu.
Phys Rev Lett 85:7 (2000) 1392-1395