Neck Rupture and Scission Neutrons in Nuclear Fission

Abdurrahman, Ibrahim; Kafker, Matthew; Bulgac, Aurel; Stetcu, Ionel

doi:10.1103/physrevlett.132.242501

Neck Rupture and Scission Neutrons in Nuclear Fission

Journal Article · Wed Jun 12 00:00:00 EDT 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.132.242501· OSTI ID:2426732

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Univ. of Washington, Seattle, WA (United States)

Just before a nucleus undergoes fission, a neck is formed between the emerging fission fragments. It is widely accepted that this neck undergoes a rather violent rupture, despite the absence of unambiguous experimental evidence. The main difficulty in addressing the neck rupture and saddle-to-scission stages of fission is that both are highly nonequilibrium processes. Here, we present the first fully microscopic characterization of the scission mechanism, along with the spectrum and the spatial distribution of scission neutrons (SNs), and some upper limit estimates for the emission of charged particles. The spectrum of SNs has a distinct angular distribution, with neutrons emitted in roughly equal numbers in the equatorial plane and along the fission axis. They carry an average energy around 3±0.5 MeV for the fission of ²³⁶U, ²⁴⁰Pu, and ²⁵²Cf, and a maximum of 16–18 MeV. We estimate a conservative lower bound of 9%–14% of the total emitted neutrons are produced at scission.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001; AC05-00OR22725; FG02-97ER41014; NA0003841

OSTI ID:: 2426732

Alternate ID(s):: OSTI ID: 2474443

Report Number(s):: LA-UR--23-25884

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 132; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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