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Brown BA, Larsen AC. Large low-energy M1 strength for ^{56,57}Fe within the nuclear shell model. Phys Rev Lett. 2014;113(25):252502doi: 10.1103/PhysRevLett.113.252502.
Brown, B. A., & Larsen, A. C. (2014). Large low-energy M1 strength for ^{56,57}Fe within the nuclear shell model. Physical review letters, 113(25), 252502. https://doi.org/10.1103/PhysRevLett.113.252502
Brown, B Alex, and Larsen, A C. "Large low-energy M1 strength for ^{56,57}Fe within the nuclear shell model." Physical review letters vol. 113,25 (2014): 252502. doi: https://doi.org/10.1103/PhysRevLett.113.252502
Brown BA, Larsen AC. Large low-energy M1 strength for ^{56,57}Fe within the nuclear shell model. Phys Rev Lett. 2014 Dec 19;113(25):252502. doi: 10.1103/PhysRevLett.113.252502. Epub 2014 Dec 19. PMID: 25554878.
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Phys Rev Lett. 2014 Dec 19;113(25):252502. doi: 10.1103/PhysRevLett.113.252502. Epub 2014 Dec 19.

Large low-energy M1 strength for ^{56,57}Fe within the nuclear shell model.

Physical review letters

B Alex Brown, A C Larsen

Affiliations

  1. National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1321, USA.
  2. Department of Physics, University of Oslo, N-0316 Oslo, Norway.

PMID: 25554878 DOI: 10.1103/PhysRevLett.113.252502

Abstract

A strong enhancement at low γ-ray energies has recently been discovered in the γ-ray strength function of ^{56,57}Fe. In this work, we have for the first time obtained theoretical γ decay spectra for states up to ≈8  MeV in excitation for ^{56,57}Fe. We find large B(M1) values for low γ-ray energies that provide an explanation for the experimental observations. The role of mixed E2 transitions for the low-energy enhancement is addressed theoretically for the first time, and it is found that they contribute a rather small fraction. Our calculations clearly show that the high-ℓ(=f) diagonal terms are most important for the strong low-energy M1 transitions. As such types of 0ℏω transitions are expected for all nuclei, our results indicate that a low-energy M1 enhancement should be present throughout the nuclear chart. This could have far-reaching consequences for our understanding of the M1 strength function at high excitation energies, with profound implications for astrophysical reaction rates.

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