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Title: Experimental M1 response of 40Ar as a benchmark for neutrino-nucleus scattering calculations

Journal Article · · Physical Review C
ORCiD logo [1];  [1];  [2];  [1];  [1];  [1];  [3];  [1];  [2];  [1]
  1. Technische Univ. Darmstadt (Germany)
  2. Duke Univ. and Triangle Univ. Nuclear Lab., Durham, NC (United States)
  3. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)

The excitation of atomic nuclei via magnetic dipole transitions is closely related to the inelastic neutral-current neutrino-nucleus (NC-νA) scattering process due to the similarity of the transition operators. NC-νA-scattering serves for the detection of supernova neutrinos and poses a significant source of background in modern liquid-argon based high-energy neutrino detection experiments. To enable tests of the reliability of predictions for neutrino-nucleus scattering, the magnetic dipole response of 40Ar below 7.7 MeV was characterized in a nuclear resonance fluorescence experiment using quasimonoenergetic γ-ray beams. The linear polarization of the beams allowed for assignments of electric or magnetic character to previously known dipole excitations. A total magnetic dipole strength of $0.36$ $$^{+0.04}_{–0.05}$$ $$μ$$ $$^{2}_{N}$$ was identified in the energy range of the present experiment. Combined with data from previous measurements, the full magnetic dipole strength of 40Ar below the neutron separation threshold was investigated. Due to the low background in the energy range within the bandwidth of the γ-ray beams, the previous sensitivity limit was improved. Furthermore, a large-scale nuclear shell model calculation in the sd–fp space satisfactorily agrees with the data in terms of excitation energies and strengths of the observed 1+ states.

Research Organization:
Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
FG02-97ER41033
OSTI ID:
1610379
Alternate ID(s):
OSTI ID: 1560771
Journal Information:
Physical Review C, Vol. 100, Issue 3; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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