Strong resonances in elastic scattering of radioactive 21Na on protons

In a first experiment with accelerated beams at TRIUMF-ISAC, the scattering of radioactive ²¹Na (T1/2 = 22.49 s) on protons has been investigated. ²¹Na beams of typically 5 × 10⁷ particles/s were employed while center-of-mass energies from 0.45 to 1.4 MeV were scanned and spectra with high statistics were collected. The experiment was carried out using large area silicon detectors at the TUDA facility. Three strong resonances corresponding to states in ²²Mg have been identified at energies of 830 keV, 1115 keV, and 1311 keV, respectively. Using these data, aspects of the T = 1, A = 22 mirror system and the s-wave component of the atstrophysically important ²¹Na(p, γ)²²Mg reaction are discussed.