Study of astrophysical α + 22Ne reaction using alpha transfer in inverse kinematics with TIARA and MDM spectrometer

Not scheduled
15m
Kunibiki Messe (Matsue)

Kunibiki Messe

Matsue

Poster Contribution

Speaker

Dr Shuya Ota (Texas A&M University)

Description

In core He burning and C-shell burning of massive stars, the 22Ne(α,n)25Mg reaction is considered to be a dominant neutron source for the weak s process. The reaction also largely contributes to the neutron production for the main s process in asymptotic giant branch (AGB) stars. While a variety of experimental attempts to determine the rate for this reaction at the Gamow window corresponding to s process temperatures have been made either through direct or indirect measurements, uncertainties of some resonance strengths in 26Mg, particularly about two resonances (Ex ~ 11.17 and 11.32 MeV) above neutron separation energy (Sn =11.09 MeV), have remained a long-standing problem. To address this problem, we performed an experiment using the 6Li(22Ne,26Mg)d α-transfer reaction in inverse kinematics at K150 cyclotron of Texas A&M University. A 6LiF target was bombarded with a 7 MeV/u 22Ne beam. Deuterons, γ-rays, and recoil Mg ions were detected in coincidence using a large Si detector array (TIARA), HPGe clover detectors, and an MDM spectrometer backed by an ionization chamber, respectively, to precisely obtain the 26Mg excitation spectrum. Results about the resonances obtained from the experiment will be presented.

Primary author

Dr Shuya Ota (Texas A&M University)

Co-authors

Dr Adrien Matta (CNRS) Mr Cordero Magana (Texas A&M University) Mr Curtis Hunt (Texas A&M University) Mr Eames Bennett (Texas A&M University) Dr Gavin Lotay (University of Surrey) Prof. Gregory Christian (Texas A&M University) Prof. Grigory Rogachev (Texas A&M University) Mrs Heshani Jayatissa (Texas A&M University) Mr Josh Hooker (Texas A&M University) Mr Mateo Muzek (Texas A&M University) Dr Mohamed Mouhkaddam (University of Surrey) Mr Ryan Wilkinson (University of Surrey) Dr Saastamoinen Antti (Texas A&M University) Mr Samuel Hallam (University of Surrey) Mr Sriteja Upadhyayula (Texas A&M University) Mrs Stefania Dede (Texas A&M University) Prof. Wilton Catford (University of Surrey)

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