Rutgers

[paper] Structure of the Sr-Zr isotopes near and at the magic N=50 shell from g-factor and lifetime measurements in8840Zr and 84,86,8838Sr

Structure of the Sr-Zr isotopes near and at the magic N=50 shell from g-factor and lifetime measurements in8840Zr and 84,86,8838Sr

G. Kumbartzki et al.

doi: 10.1103/PhysRevC.85.044322

Background: The evolution of and interplay between single-particle and collective excitations in the 40 ⩽N⩽ 50 range for 38Sr and 40Zr isotopes have been studied.

Purpose: Measurement of the g factor of the 21+ and 41+ states in radioactive 88Zr while simultaneously remeasuring the g(21+) factors in the Sr isotopes and extention of the measurements to higher energy states in the Sr isotopes. Lifetimes of states in these nuclei are determined.

Methods: The transient field technique in inverse kinematics and line-shape analysis using the Doppler-shift attenuation method are applied. The 88Zr nuclei were produced by the transfer of an α particle from the 12C nuclei of the target to 84Sr nuclei in the beam. The excited states in the stable 84Sr isotopes were simultaneously populated via Coulomb excitation by 12C in the same target. Coulomb excitation measurements on 86,88Sr were carried out with the same apparatus.

Results: The resulting g factors and B(E2) values of these nuclei reveal similarities between the two chains of Zr and Sr isotopes. Large-scale shell-model calculations were performed within the p3/2, f5/2, p1/2, g9/2 orbital space for both protons and neutrons and yielded results in agreement with the experimental data.

Conclusions: In this paper the magnetic moments and lifetimes of several low-lying states in 88Zr and 84,86,88Sr have been measured and compared to large-scale shell-model calculations.

Apr 30, 2012 by experiment g factor 0

[paper] Measurement of the 96Ru g(41+) factor and its nuclear structure interpretation

Measurement of the 96Ru g(41+) factor and its nuclear structure interpretation

D.A. Torres et al.

doi: 10.1103/PhysRevC.85.017305

Background: The experimental study of g(I>2) factors of nuclear states can provide information about the evolution of collectivity in certain regions of the nuclear chart, and assist in obtaining a microscopic description of the nuclear wave functions. The measurements and explanations of g(I>2) factors are still a challenge for experiments and theory.

Purpose: Measurement of the g(21+) and g(41+) factors, the latter for the first time, in the 9644Ru nucleus. Comparison of the experimental results with calculations using the shell model and collective models.

Methods: The experiments made use of the transient field technique, using a Coulomb-excitation reaction in inverse kinematics. Large scale shell model calculations were performed; comparisons with previous theoretical predictions, using the tidal-wave model and the hydrodynamical model, were carried out.

Results: The values of g(21+)=+0.46(2) and g(41+)=+0.58(8) were experimentally obtained. While the g(21+) value agrees with the hydrodynamical model prediction of g=Z/A=+0.46, the g(41+) is in agreement with the shell model predictions. The trend of the experimental g factors, as a function of nuclear spin, is not reproduced by the theoretical models discussed.

Conclusions: Measurements of g(21+) and g(41+) in 96Ru were performed. Further theoretical efforts are necessary to explain the trend of the g factors as a function of nuclear spin for the 96Ru nucleus. Future measurements of g(41+) should reduce the uncertainty of the result.

Jan 30, 2012 by g factor 0

[paper] First g-factor measurements of the 21+ and the 41+ states of radioactive 100Pd

First g-factor measurements of the 21+ and the 41+ states of radioactive 100Pd

D.A. Torres et al.

doi: 10.1103/PhysRevC.84.044327

The g factors of the first 2+ and 4+ states of the radioactive 100Pd nucleus have been investigated for the first time, using an α-particle transfer reaction from 12C to 96Ru. The transient magnetic field technique in inverse kinematics was used. The 10046Pd54 nucleus is a suitable candidate for studying single-particle proton and neutron effects in the nuclear wave functions near the N=Z=50 shell closures. The results are discussed within the frameworks of both large-scale shell-model calculations and collective-model predictions.

Oct 25, 2011 by g factor 0

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21Mg 22Mg 23Mg 24Mg 25Mg 26Mg 27Mg 28Mg 29Mg 30Mg 31Al 31Mg 32Mg 33Al 33Mg 40Ar 42Sc 43S 43Sc 44Ar 44Cl 44Sc 45Sc 46Sc 55Ni 57Cu 58Cu 59Cu 61Cu 62Cu 63Cu 64Cu 65Cu 66Cu 67Cu 68Cu 69Cu 70Cu 71Cu 72As 72Cu 72Zn 73Cu 74Cu 74Se 75Cu 76Kr 76Se 77Cu 78Cu 78Kr 78Se 80Kr 80Se 82Kr 82Se 84Kr 84Sr 86Sr 88Kr 88Sr 88Zr 96Ru 100Pd 100Sn 102Ag 104Ag 106Ag 108Ag 110Ag 110Cd 112Sn 114Sn 116Sn 122Sn 124Sn 132Sn 137Ba 140Xe 142Xe 144Nd 146Ba 146Ce 146Nd 148Ce 148Nd 150Nd 154Gd 156Gd 157Er 158Er 168Hf 171Hf 172Hf 187Tl 189Tl 191Tl 193Tl 195Tl 197Tl 229Th 239Pu 250Bk 253Es 254Es 255Fm actinides antiproton arxiv B(E2) b-NMR BCS Be charge radd charge radii chiral effective field theory chiral quark model collinear laser spectroscopy conference paper correlation attenuation Coulex covariant CPT cranker database DSAM electric quadrupole moment electromagnetic moments electron EPJA experiment Gammasphere GANIL g factor Green functions HVTF hydrogen like hyperfine field Hyperfine Interactions hyperfine splitting IBM IBM-2 IBMFM IGISOL in-gas-cell laser spectroscopy island of inversion ISOLDE isomer isotope shift JPhysG KISS laser laser-induced nuclear orientation laser spectroscopy Li LISE LISOL magnetic moment magnetic quadrupole moment mean field MEC moments Monte Carlo N3LO Nilsson-Strutinsky NMR NMR/ON nuclear moments nuclear spin nucleon octupole nuclear magnetic moment PAC PAN paper Paul trap Penning PLB PRC preprint PRL proton QCD QED quadrupole deformation quadrupole moment resonant ionization spectroscopy RIKEN Rutgers Science Science China SDPF-U shell model spin expectation value TDPAD TF theory TIPAD triaxial Λ resonance α-transfer