Low-energy enhancement of the magnetic dipole radiation in odd-mass lanthanides

DeMartini, D.; Alhassid, Y.

doi:10.1103/physrevc.111.034315

Low-energy enhancement of the magnetic dipole radiation in odd-mass lanthanides

Journal Article · Tue Mar 11 00:00:00 EDT 2025 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.111.034315· OSTI ID:2566730

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Yale University, New Haven, CT (United States); Ylae University, New Haven, CT (United States)
Yale University, New Haven, CT (United States)

We compute the magnetic dipole (M1) $$\gamma$$-ray strength functions ($$\gamma$$SF) for the odd-mass lanthanides $$^{\textrm{143-151}}$$Nd and $$^{\textrm{147-153}}$$Sm using the shell-model Monte Carlo method in combination with the static-path approximation and the maximum-entropy method. In particular, we quantify the statistical uncertainties in the calculated M1 $$\gamma$$SFs and show that they are under control for the excitation energies relevant to the experiments despite a Monte Carlo sign problem that originates in the projection onto an odd number of neutrons. We identify a low-energy enhancement (LEE) in the M1 $$\gamma$$SFs of these odd-mass lanthanides, which was recently observed experimentally in some of them. We also find a scissors mode resonance (SR) in the strongly deformed isotopes. We observe that the decrease in the LEE strength with neutron number along an isotopic chain is compensated for by an increase in the SR strength in the deformed nuclei. Furthermore, we compare our results with recent experiments.

View Accepted Manuscript (DOE)

Research Organization:: Yale University, New Haven, CT (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-05CH11231; SC0019521

OSTI ID:: 2566730

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 111; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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