Structure in the event-by-event energy-dependent neutron-$γ$ multiplicity correlations in 252Cf(sf)

Marin, Stefano; Okar, M. Stephan; Sansevero, Eoin P.; Hernandez, Isabel E.; Ballard, Catherine A.; Vogt, Ramona; Randrup, Jørgen; Talou, Patrick; Lovell, Amy E.; Stetcu, Ionel; Serot, Olivier; Litaize, Olivier; Chebboubi, Abdelhazize; Clarke, Shaun D.; Protopopescu, Vladimir A.; Pozzi, Sara A.

doi:10.1103/physrevc.104.024602

Title: Structure in the event-by-event energy-dependent neutron-$$γ$$ multiplicity correlations in ²⁵²Cf(sf)

Journal Article · Mon Aug 02 00:00:00 EDT 2021 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.104.024602· OSTI ID:1821158

^[1]; Okar, M. Stephan ^[1]; Sansevero, Eoin P. ^[1];

^[1];

^[2]; Randrup, Jørgen ^[3];

^[4];

^[4]; Stetcu, Ionel ^[4]; Serot, Olivier ^[5];

^[5];

^[5]; Clarke, Shaun D. ^[1]; Protopopescu, Vladimir A. ^[6]; Pozzi, Sara A. ^[1]

Univ. of Michigan, Ann Arbor, MI (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Davis, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Alternative Energies and Atomic Energy Commission (CEA), Cadarache (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The emission of neutrons and γ rays by fission fragments reveal important information about the properties of fragments immediately following scission. The initial fragment properties, correlations between fragments, and emission competition give rise to correlations in neutron-γ emission. Recent theoretical and experimental advances have been proposed to explain the mechanism of angular momentum generation in fission, which would result in observable signature in neutron-γ emission correlations. In this paper, we present a novel analysis method of neutrons and γ rays emitted by fission fragments that allows us to discern structure in the observed correlations. We have analyzed data collected on ²⁵²Cf (sf) at the Chi-Nu array at the Los Alamos Neutron Science Center. Through our analysis of the energy-differential neutron-γ multiplicity covariance, we have observed enhanced neutron-γ correlations, corresponding to rotational band γ-ray transitions, at γ-ray energies of 0.7 and 1.2 MeV. To shed light on the origin of this structure, we compare the experimental data with the predictions of three model calculations. The origin of the observed correlation structure is understood in terms of a positive spin-energy correlation in the generation of angular momentum in fission.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-05CH11231; AC52-07NA27344; AC05-00OR22725; 89233218CNA000001; NA0002534; NA0003920

OSTI ID:: 1821158

Alternate ID(s):: OSTI ID: 1826366; OSTI ID: 1833254

Report Number(s):: LA-UR-21-20802; ark:/13030/qt0nj5n8tt; TRN: US2214317

Journal Information:: Physical Review C, Vol. 104, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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