6533b82efe1ef96bd12929e6
RESEARCH PRODUCT
Decay of the key 92-keV resonance in the 25Mg(p,γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter 26Al
Claudia Lederer-woodsR. V. F. JanssensR. V. F. JanssensS. ZhuS. ZhuD. SeweryniakD. T. DohertyD. T. DohertyH. M. AlbersM. P. CarpenterA. D. AyangeakaaA. D. AyangeakaaPhilip WoodsJ. L. HarkerJ. L. HarkerC. J. ChiaraC. J. ChiaraM. AlbersFrank StriederAnu KankainenAnu Kankainensubject
Nuclear and High Energy Physicsγ spectroscopyastrofysiikkaAstrophysics::High Energy Astrophysical Phenomenanuclear astrophysics01 natural sciences7. Clean energy0103 physical sciencesNuclear astrophysics010306 general physicsSpin (physics)PhysicsRange (particle radiation)COSMIC cancer database010308 nuclear & particles physicsBranching fractionResonanceState (functional analysis)lcsh:QC1-99926Alcosmic γ raysNuclear astrophysicsCosmic γ raysAtomic physicsydinfysiikkaGround statekosminen säteilylcsh:Physicsdescription
Abstract The 92-keV resonance in the 25Mg ( p , γ ) 26 Al reaction plays a key role in the production of 26Al at astrophysical burning temperatures of ≈100 MK in the Mg-Al cycle. However, the state can decay to feed either the ground, 26 g Al, or isomeric state, 26 m Al. It is the ground state that is critical as the source of cosmic γ rays. It is therefore important to precisely determine the ground-state branching fraction f 0 of this resonance. Here we report on the identification of four γ-ray transitions from the 92-keV resonance, and determine the spin of the state and its ground-state branching fraction f 0 = 0.52 ( 2 ) s t a t ( 6 ) s y s t . The f 0 value is the most precise reported to date, and at the lower end of the range of previously adopted values, implying a lower production rate of 26 g Al and its cosmic 1809-keV γ rays.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-02-01 |