Author/Authors :
Pollacco، نويسنده , , E. and Trache، نويسنده , , L. and Simmons، نويسنده , , E. and Spiridon، نويسنده , , A. and McCleskey، نويسنده , , M. and Roeder، نويسنده , , B.T. and Saastamoinen، نويسنده , , A. and Tribble، نويسنده , , R.E. and Pascovici، نويسنده , , G. and Kebbiri، نويسنده , , M. and Mols، نويسنده , , J.P. and Raillot، نويسنده , , M.، نويسنده ,
Abstract :
An instrument, AstroBox, has been developed to perform low energy proton spectroscopy from β-delayed proton emitters of interest to astrophysics studies. Energetic precursor nuclei are identified and stopped in the gas volume of the detector. The subsequent β or β-proton decay traces ionized paths in the gas. The ionization electrons are drifted in an electric field and are amplified with a Micro Pattern Gas Amplifier Detector (MPGAD). The system was tested in-beam using the β-delayed proton-emitter 23Al, which was produced with the p(24Mg,23Al)2n reaction and separated with the Momentum Achromat Recoil Spectrometer (MARS) at the Cyclotron Institute at Texas A&M University. Off-beam proton spectra have essentially no β background down to ∼ 100 keV and have a resolution of ∼ 15 keV (fwhm) for proton-decay lines at E p = 197 and 255 keV. Lines with βp-branching as low as 0.02% are observed. In addition, the device also gives good mass and charge resolution for energetic heavy ions measured in-beam.
Keywords :
?-delayed proton decay , Nuclear astrophysics , 23Al , Micro pattern gas amplifier detector , MPGAD
