First measurement in the Gamow window of a reaction for the γ-process in inverse kinematics: 76Se(α,γ)80Kr

Fallis, J.; Akers, C.; Laird, A. M.; Simon, A.; Spyrou, A.; Christian, G.; Connolly, D.; Hager, U.; Hutcheon, D. A.; Lennarz, A.; O'Malley, P.; Quinn, S. J.; Riley, J.; Rojas, A.; Ruiz, C.; Williams, M.

doi:10.1016/j.physletb.2020.135575

Title: First measurement in the Gamow window of a reaction for the γ-process in inverse kinematics: ⁷⁶Se(α,γ)⁸⁰Kr

Journal Article · Tue Jun 23 00:00:00 EDT 2020 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2020.135575· OSTI ID:1779701

^[1];

^[2]; Laird, A. M. ^[3]; Simon, A. ^[4]; Spyrou, A. ^[5]; Christian, G. ^[6];

^[7]; Hager, U. ^[8];

^[1];

^[1]; O'Malley, P. ^[9]; Quinn, S. J. ^[5]; Riley, J. ^[3]; Rojas, A. ^[1]; Ruiz, C. ^[1]; Williams, M. ^[10]

TRIUMF, Vancouver, BC (Canada)
TRIUMF, Vancouver, BC (Canada); Univ. of York (United Kingdom); Inst. of Basic Science, Daejeon (Korea, Republic of)
Univ. of York (United Kingdom)
Univ. of Notre Dame, IN (United States)
Michigan State Univ., East Lansing, MI (United States)
TRIUMF, Vancouver, BC (Canada); St. Mary's Univ., Halifax, NS (Canada)
Colorado School of Mines, Golden, CO (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Michigan State Univ., East Lansing, MI (United States); Colorado School of Mines, Golden, CO (United States)
Colorado School of Mines, Golden, CO (United States); Univ. of Notre Dame, IN (United States)
TRIUMF, Vancouver, BC (Canada); Univ. of York (United Kingdom)

The p-nuclei are the few stable nuclei heavier than iron on the neutron-deficient side of the valley of stability that cannot be produced through astrophysical neutron-capture reactions. The limited experimental data on reactions through which the p-nuclei might be produced leaves the origin of their production largely unknown. This work presents the first cross section measurements of the ⁷⁶Se(α,γ)⁸⁰Kr reaction. The rate of the time reversed reaction, ⁸⁰Kr(γ,α)⁷⁶Se, is one of the most uncertain of possible reactions which can occur at the ⁸⁰Kr branching point on the ,-process photo-disintegration pathway. The reaction flow through ⁸⁰Kr will directly affect the final abundance of the p nuclide ⁷⁸Kr. Experimental cross sections at two astrophysically relevant energies are reported and compared to cross sections calculated using Hauser-Feshbach codes TALYS, NON-SMOKER, and SMARAGD. The success of these first (α,γ) cross section measurements performed in inverse kinematics in the energy region of the γ-process opens the door for future studies of reactions on radioactive γ-process nuclides.

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Research Organization:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: FG02-93ER40773; PHY-1614442; PHY-1430152

OSTI ID:: 1779701

Journal Information:: Physics Letters B, Vol. 807; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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