New approach to determining radiative capture reaction rates at astrophysical energies

Friščić, I.; Donnelly, T. W.; Milner, R. G.

doi:10.1103/physrevc.100.025804

New approach to determining radiative capture reaction rates at astrophysical energies

Journal Article · Fri Aug 16 00:00:00 EDT 2019 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.100.025804· OSTI ID:1610264

^[1]; Donnelly, T. W. ^[2]; Milner, R. G. ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); DOE/OSTI
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Radiative capture reactions play a crucial role in stellar nucleosynthesis but have proved challenging to determine experimentally. In particular, the large uncertainty (≈100%) in the measured rate of the ¹²C(α,γ)¹⁶O reaction is the largest source of uncertainty in any stellar evolution model. With development of high-current energy-recovery linear accelerators (ERLs) and high-density gas targets, measurement of the ¹⁶O(e,e'α)¹²C reaction close to threshold using detailed balance allows a new approach to determine the ¹²C(α,γ)¹⁶O reaction rate with significantly increased precision (<20%). We present the formalism to relate photo- and electrodisintegration reactions and consider the design of an optimal experiment to deliver increased precision. Furthermore, once the new ERLs come online, an experiment to validate the approach we propose should be carried out. This approach has broad applicability to radiative capture reactions in astrophysics.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-94ER40818

OSTI ID:: 1610264

Alternate ID(s):: OSTI ID: 1564333

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 100; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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