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Decay microscope for trapped neon isotopes

Ben Ohayon, Hitesh Rahangdale, Elad Parnes, Gedalia Perelman, Oded Heber, and Guy Ron
Phys. Rev. C 101, 035501 – Published 9 March 2020

Abstract

We review the design, simulation, and tests of a detection system for measuring the energy distribution of daughter nuclei recoiling from the β decay of laser trapped neon isotopes. This distribution is sensitive to several new physics effects in the weak sector. Our “decay microscope” relies on imaging the velocity distribution of high-energy recoil ions in coincidence with electrons shaken off in the decay. We demonstrate by way of Monte Carlo simulation that the nuclear microscope increases the statistical sensitivity of kinematic measurements to the underlying energy distribution and limits the main systematic bias caused by discrepancy in the trap position along the detection axis.

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  • Received 2 November 2019
  • Revised 4 January 2020
  • Accepted 19 February 2020

DOI:https://doi.org/10.1103/PhysRevC.101.035501

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Ben Ohayon1,2,*, Hitesh Rahangdale1, Elad Parnes1, Gedalia Perelman3, Oded Heber3, and Guy Ron1

  • 1Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
  • 2Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
  • 3The Weizmann Institute of Science, Rehovot 76100, Israel

  • *benohayon@gmail.com

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Issue

Vol. 101, Iss. 3 — March 2020

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Images

  • Figure 1
    Figure 1

    Deflection computer assisted drawing (CAD) model. MCP phosphor-screen image with regular and 1D compressed beam is shown in the inset. For ion-imaging electrodes, see Fig. 3. AH, anti-Helmholtz pair; ZS, Zeeman slower.

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  • Figure 2
    Figure 2

    Trap volume deduced from CCD camera images (inset). The detuning is in units of the natural linewidth, Γ=8 MHz, and its effect on volume is well described by the Doppler model.

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  • Figure 3
    Figure 3

    Top: Simion 8.1 simulation of charged particles emerging from the trap volume and focused to the detectors. Shake-off electrons up to 50 eV are collected on the microchannel plate (MCP) and give a start signal. Doubly charged Na23 ions of various energy groups up to 600 eV are focused to 0.1 mm on a position-sensitive detector. Bottom: CAD model of science chamber including the trapping laser beams, the imaging setup electrodes, and the detectors.

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  • Figure 4
    Figure 4

    Simulated detection system response for different energy groups emitted isotropically from the trap volume. Top: Time-of-flight distributions. Bottom: Squared hit position distributions.

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