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Title: Low-energy magnetic radiation: Deviations from GOE

A pronounced spike at low energy in the strength function for magnetic radiation (LEMAR) is found by means of Shell Model calculations, which explains the experimentally observed enhancement of the dipole strength. LEMAR originates from statistical low-energy M1-transitions between many excited complex states. Re-coupling of the proton and neutron high-j orbitals generates the strong magnetic radiation. LEMAR is closely related to Magnetic Rotation. LEMAR is predicted for nuclides participating in the r-process of element synthesis and is expected to change the reaction rates. An exponential decrease of the strength function and a power law for the size distribution of the B(M1) values are found, which strongly deviate from the ones of the GOE of random matrices, which is commonly used to represent complex compound states.
Authors:
 [1] ;  [2] ;  [3]
  1. University Notre Dame, IN 46557 (United States)
  2. IRP, HZDR, 01328 Dresden (Germany)
  3. Central Michigan University, Mt. Pleasant, MI 48859 (United States)
Publication Date:
OSTI Identifier:
22307995
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1619; Journal Issue: 1; Conference: 4. conference on nuclei and mesoscopic physics 2014, East Lansing, MI (United States), 5-9 May 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COUPLING; M1-TRANSITIONS; NEUTRONS; NUCLEAR REACTION KINETICS; NUCLEAR STRUCTURE; NUCLEOSYNTHESIS; PROTONS; R PROCESS; RANDOMNESS; SHELL MODELS; STRENGTH FUNCTIONS