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Study of β-Decays in 20Mg: Insights and Measurements

This study explores the β-decay processes of 20Mg, emphasizing measurements conducted between 1981 and 2004. Key findings reveal challenges in measuring decay due to b-delayed alpha emissions from daughter decay of 20Na. The research combines data to establish upper limits on energy levels and probes for mirror symmetry in nuclear decay processes. An extensive program was undertaken using advanced setups, including the Gas-Si telescope and high-efficiency detection systems at ISOLDE, aiming for precision and statistical validity in the measurement of transitions and states.

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Study of β-Decays in 20Mg: Insights and Measurements

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  1. Study of the b-decay of 20Mg Hans Fynbo onbehalf of • M.J.G. Borge, J. Cederkäll, L.M. Fraile, T. Giles, K.L Jensen, J.S. Johansen, B. Jonson, G. T. Koldste, • E. Nacher, T. Nilsson, A. Perea, K. Riisager, T. Storra, O. Tengblad

  2. rp-process (p,g) (a,g) b Ann.Rev.Nucl.Part.Sci. 2010. 60:381-404 (p,a) hCNO cycle

  3. Direct19Ne(p,g)20Na measurement at Louvain-la-Neuve (1995-2004) • Upper limit wg<15meV • Complete spectroscopy at Argonne with GammaSphere (2004) • No solution as to 1+ or 3+ • Measurements of b-decay of 20Mg (1981-1995) • Population of 2643keV not observed • Limit too weak to exclude 1+ Nucl.Phys. A616 (1997) 107c.

  4. bp ba

  5. 20Mg b-decay • Only 1+ states populated in allowed GT decays • Search for b-delayed proton line at 450keV, or b-delayed g-emission • Approach challenging due to b-delayed a-emission from daughter decay of 20Na

  6. Berkeley 1981 • RIKEN, MSU 1992 • GANIL 1995 Previous measurements RIKEN 1992 GANIL1995

  7. Berkeley1981 MSU 1992 a DE-E telescope GANIL1995 RIKEN 1992 a-subtracted a

  8. 20O Overview of previous work 3.65(6) 3.740(6)

  9. New measurement at ISOLDE • Measure b-delayed proton and gspectrum with high statistics and under much improved conditions • Measure bp, bg and gp coincidences to correctly assign p-peaks. • Physics : • Mirror symmetry • GT-distribution • assignment of 2645keV level

  10. TWO measurements: Gas-Si telescope Large efficiency setup

  11. ISOLDE production of 20Mg? Production of Mg from SiC with RILIS (ions/mC): 2×104

  12. IMPACT OF NEW MEASUREMENT

  13. Summary and beam request • We ask for 18 shifts of radioactive beams • 6 shifts for Gas-Si telescope (3shifts tuning) • 12 shifts for High Efficiency setup (3 shifts tuning) • If scheduled at LA1 and LA2 back-to-back save 3 shifts

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