Elsevier

Nuclear Physics A

Volume 505, Issue 2, 11 December 1989, Pages 193-214
Nuclear Physics A

Lifetime measurements in 57Fe following the 56Fe(n, γ) and 56Fe(d, p) reactions

https://doi.org/10.1016/0375-9474(89)90370-9Get rights and content

Abstract

The novel method of γ-ray induced Doppler broadening (GRID) after thermal neutron capture has been applied to measure the mean lives of the 1627, 1725 and 3428 keV states in 57Fe excited in the reaction 56Fe(n, γ). The lifetimes of these three and many other states in 57Fe have been determined using the 56Fe(d, p) reaction. From a comparison of the lifetime values obtained in both reactions the stopping power of slow 57Fe atoms (E < 500 eV) recoiling in the Fe target has been checked. Furthermore, many new transitions have been assigned to 57Fe in the 56(d, p) reaction. Energies, mean lives and transition strengths in 57Fe have been compared with predictions of shell model calculations, involving 3p2h and 4p3h configurations.

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      Citation Excerpt :

      Lifetimes of nuclear excited states can be measured using the Gamma-Ray-Induced Doppler broadening (GRID) method [7–9] in which one determines the Doppler broadening of secondary gamma-rays which are emitted while the nucleus is recoiling due to the emission of preceding gamma-transitions. The method was first tested in experiments with light nuclei [7,35–38] where the recoils are relatively large (in the 100 eV region) due to the small mass. Besides tests of the shell model the most important result in this region was the observation of mixed symmetry states in 54Cr [35].

    • Nuclear data sheets for A = 57

      1998, Nuclear Data Sheets
    • Nuclear data sheets update for A = 57

      1992, Nuclear Data Sheets
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    Work partially supported by Deutsches BMFT under contract 06GOE141.

    1

    Present address: WNSL Yale University, New Haven, CT06511, USA.

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