220 research outputs found
Measurement of conversion electrons with the reaction and derivation of the shell model proton neutron hole interaction from the properties of
No full textConversion electrons from 208Bi have been measured using singles and coincidence techniques with the 208Pb(p,n)208Bi reaction at 9 MeV. The new information on multipolarities and spins complements that available from recent gamma-gamma-coincidence studies with the same reaction [Boutachkov et al., Nucl. Phys. A768, 22 (2006)]. The results on electromagnetic decays taken together with information on spectroscopic factors from earlier single-particle transfer reaction measurements represent an extensive data set on the properties of the one-proton one-neutron-hole states below 3 MeV, a spectrum which is virtually complete. Comparison of the experimental observables, namely, energies, spectroscopic factors, and gamma-branching ratios, with those calculated within the shell model allows extraction of the matrix elements of the shell model residual interaction. More than 100 diagonal and nondiagonal elements can be determined in this way, through a least squares fit to the experimental data. This adjustment of the interaction significantly affects the calculated properties of the gamma-ray transitions. Nevertheless, the matrix elements thus obtained are remarkably similar to those of a realistic interaction calculated from free-nucleon scattering. Characteristic features of the interaction are discussed
Slow Extraction Spill Characterization From Micro to Milli-Second Scale
No full textThis contribution deals with the topic of slow extraction spill quality characterization based on the measurements performed at GSI SIS-18. The sensitivity of the spill to power supply ripples are studied by introducing external ripples. An estimate of sources of inherent power supply ripples along with ripple magnitude are thus obtained. Spill characterization in time and frequency domain are discussed and exemplified by a typical spill and the differences from an ideal or Poisson spill. An appropriate spill characterization aims to provide a suitable abstraction for communication about the spill quality requirements between accelerator operations and users
In-band and inter-band \mth{B (E2)} values within the Triaxial Projected Shell Model
No full textThe Triaxial Projected Shell Model (TPSM) has been successful in
providing a microscopic description of the energies of
multi-phonon vibrational bands in deformed nuclei. We report here
on an extension of the TPSM to allow, for the first time,
calculations of values connecting - and
-vibrational bands and the ground-state band. The
method is applied to Er. It is shown that most of the
existing data can be reproduced rather well, thus
strongly supporting the classification of these states as
-vibrational states. However, significant differences
between the data and the calculation are seen in those
values which involve odd-spin states of the -band.
Understanding these discrepancies requires accurate experimental
measurements and perhaps further improvements of the TPSM
Doppler Shift as a Tool for Studies of Resonant (p,n) Reactions with RIBs: Spectroscopy of 7He
No full textWe report on a new methods for studies of neutron rich systems through resonant (p,n) reaction with radioactive ion beams. A specific example of the spectroscopy of 7He and future application of the proposed methods are discussed
Measurement of conversion electrons with the 208 Pb(p,n) 208 Bi reaction and derivation of the shell model proton neutron hole interaction from the properties of 208 Bi
No full textConversion electrons from Bi208 have been measured using singles and coincidence techniques with the Pb208(p,n)Bi208 reaction at 9 MeV. The new information on multipolarities and spins complements that available from recent γ-γ-coincidence studies wit
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