Super-FRS MNT Reactions with Secondary Beams
Experimental plan to establish MNT reactions with slowed-down radioactive beams at the Super-FRS for heavy neutron-rich isotopes, focusing on a 1-day test with a near-stable secondary beam. Objectives include in-cell reactions with a 238U beam and proof-of-principle measurements. The proposal aims to produce and measure ground-state properties of isotopes in the A=190-260 range, supported by the G-PAC report. Details include experimental settings, optimization strategies, and comparisons to primary beams.
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S179 - First test of MNT reactions with secondary beams at the FRS Ion Catcher Ali Mollaebrahimi (spokesperson), Timo Dickel (co-spokesperson), Christoph Scheidenberger (GSI contact) for the Super-FRS Experiment Collaboration Long-term goal: establish MNT reactions with slowed-down radioactive beams at the Super-FRS to produce and measure ground-state properties of heavy (A=190-260) neutron-rich isotopes Supported by the supernumerary G-PAC report (February 2022) S117 experiment in May 2024: in-cell MNT reactions with slowed-down 238U beam on targets inside CSC proof-of-principle measurements: 30 cross sections 238U+64Ni 23 new masses and 60 new cross sections: 238U+238U 13 main shifts scheduled: 24 27 May 2024 This proposal is a 1-day test for MNT reaction with a near stable secondary beam Timo Dickel Super-FRS EC Meeting, Walldorf, 18/19.01.2024
MNT reactions with secondary beams at the FRS IC Experimental plan and objectives 1) FRS setting: 1) 1 GeV/u 238U, centered on 236U 2) 6.4 g/cm Pb target, reaction ED ~ 1 barn 3) S1 slits +-5 mm 4) S2 slits +-15 mm, S2 Wedge 2 g/cm and -4 mrad (between mono- and achromatic) 5) S3 slits +-5 mm 6) S4 slits +-5 mm (in Lise to simulate the MNT target, optics with correct focusing to be done) 7) 5E5 236U / s on MNT target with 3.3E8 238U / s on target 2) Optimze range, range distribution and focusing on MNT target: 1 shifts Idea is to use same Brho in second half of FRS as in stable beam experiment to make this easier 3) proof-of-principle: 2 shifts CSC extraction tuning with 236U+209Bi: spectroscopy of 211Po,211mPo in DU1 method validation with236U+209Bi/64Ni: compare ~10 cross sections against data from S117 / Legnaro Timo Dickel Super-FRS EC Meeting, Walldorf, 18/19.01.2024
MNT reactions with secondary beams at the FRS IC Proof-of-principle: 238U+64Ni Comparison to primary beam: Factor 2 loss in energy spread Factor 2 loss in focusing (LISE is to optimistic) 5E5 (LISE++) correspond to 1E5 236U/s (reality), so factor 100 lower Sensitivity limit for S117: 0.1 mbarn sensitivity limit 10 mbarn more than 10 isotopes on reach above the sensitivity limit L. Corradi et al. Phys. Rev. C 59, 261 (1999) A. V. Karpov, V. V. Saiko Phys. Rev. C 96, 024618 (2017) Timo Dickel | JLU Gie en Super-FRS EC Meeting April 27 28, 2023 Timo Dickel Super-FRS EC Meeting, Walldorf, 18/19.01.2024
MNT reactions with secondary beams at the FRS IC Other Issues for both MNT experiments All detectors (S2 and S4) have to be on drives, because they are needed to setup the beam, but for the experiment they have to be removed due to the high rate S4 roof has to be closed to allow operation up to 107 238U / s Before and after the experiment no other changes calibrations needed as shown but does not influence other experiments Timo Dickel | JLU Gie en Super-FRS EC Meeting April 27 28, 2023 Timo Dickel Super-FRS EC Meeting, Walldorf, 18/19.01.2024
