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[en] New levels have been established above the 861-keV, 9/2+ isomeric state in 61Fe. The observations can be reproduced satisfactorily by shell model calculations, but only after a significant lowering of the νg9/2 single-particle energy with respect to the value determined empirically from levels outside a 48Ca core. The results are also described well within the scope of the particle-triaxial-rotor model assuming a deformation β2 ∼ 0.24. The present findings, together with the recently measured magnetic and quadrupole moments of this state, point toward a structure possibly associated with a prolate shape
Journal
Physical Review. C, Nuclear Physics; ISSN 0556-2813; 
; v. 77; p. 044314
; v. 77; p. 044314
[en] 60Fe is one of the most interesting radioisotopes found on earth. With an halflife of 1.5 Myr it is sensitive to the younger history of the universe (seen as 60Co decays) and the earth (seen as 60Fe in deep see manganese crusts), but contains basically no pre-solar information. In order to use the observational information in a quantitative manner, production and destruction mechanisms of 60Fe have to be understood. Therefore we measured the neutron capture cross section of 60Fe in the astrophysically interesting energy region applying the activation technique at the Forschungszentrum Karlsruhe (FZK). The sample material of 1.1*10**16 atoms has been retrieved from a cupper beam stop, which has been irradiated with protons at the Paul Scherrer Institute (PSI)
Journal
Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195; ; CODEN VDPEAZ; v. 43(3); [1 p.]
; CODEN VDPEAZ; v. 43(3); [1 p.]
[en] New levels have been established above the 861-keV, 9/2+ isomeric state in 61Fe. The observations can be reproduced satisfactorily by shell model calculations, but only after a significant lowering of the νg9/2 single-particle energy with respect to the value determined empirically from levels outside a 48Ca core. The results are also described well within the scope of the particle-triaxial-rotor model assuming a deformation β2∼0.24. The present findings, together with the recently measured magnetic and quadrupole moments of this state, point toward a structure possibly associated with a prolate shape
Journal
[en] We report here on the last progresses made with the PHOENIX electron cyclotron resonance charge breeder test bench at ISOLDE. Recently, an experiment was performed to test the trapping of 61Fe daughter nuclides from the decay of 61Mn nuclides. Preliminary results are given
Journal
[en] This paper demonstrates the feasibility of quadrupole moment measurements on isomeric levels populated in projectile fragmentation reactions. The neutron-rich 61Fe(9/2+) [E*= 861 keV, T1/2= 239(5) ns] isomer was produced and spin aligned by the intermediate energy fragmentation of a 64Ni beam and implanted in a Cd single crystal. Its spectroscopic quadrupole moment |Qs|=41(6) e fm2 agrees with mean-field based calculations using the finite-range Gogny force, suggesting a moderately deformed shape characterized by an intrinsic charge quadrupole moment Q0=-85 e fm2 or Q0=+115 e fm2. The present measurement paves the way for future determinations of isomeric quadrupole moments in more exotic nuclei
Journal
[en] Short communications only
Source
China Nuclear Information Centre, Beijing, BJ (China); Chinese Nuclear Data Center, Beijing, BJ (China); 113 p; ISBN 7-5022-0830-5; ; Jun 1993; p. 59
; Jun 1993; p. 59
[en] An 60Fe target for studying the 60Fe(n, γ)61Fe cross-section at stellar energies was prepared using radio-chemical separation techniques. In total, 7.8x101560Fe atoms (777 ng) were separated from a copper beam dump for the 590 MeV proton beam of the high intensity accelerator at PSI. The final target was prepared by evaporating the iron-containing aqueous solution onto a graphite backing. With this sample the keV neutron capture cross-section of 60Fe has been measured at FZ Karlsruhe. The work is part of the ERAWAST-initiative (Exotic Radionuclides from Accelerator WAste for Science and Technology) which is aimed at extracting rare valuable radionuclides from accelerator waste by chemical means.
Journal
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; ISSN 0168-9002; ; CODEN NIMAER; v. 613(3); p. 347-350
; CODEN NIMAER; v. 613(3); p. 347-350
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