{
  "id": "1810.00958",
  "version": "v1",
  "published": "2018-10-01T20:13:14.000Z",
  "updated": "2018-10-01T20:13:14.000Z",
  "title": "Measurement of the neutron lifetime using a magneto-gravitational trap",
  "authors": [
    "Nathan Callahan"
  ],
  "comment": "Talk presented CIPANP2018. 6 pages, 1 figure, LaTeX",
  "categories": [
    "nucl-ex",
    "physics.ins-det"
  ],
  "abstract": "Precision measurements of the free neutron lifetime $\\tau_n$, when combined with measurements of the axial vector form factor, can be used to test unitarity of the CKM matrix. Non-unitarity is a signal for physics Beyond the Standard Model (BSM). Sensitivity to BSM physics requires measurements of $\\tau_n$ to a precision of 0.1~s. However, the two dominant techniques to measure $\\tau_n$ (colloquially beam and bottle measurements) disagree by nearly 10~s. UCN$\\tau$ is a neutron lifetime experiment using a magneto-gravitational trap and an in-situ neutron detector. Neutrons in this trap are not susceptible to loss on material walls as in previous bottle measurements. Additionally, the in-situ detector allows spectral monitoring of the trapped Ultracold Neutrons. In this talk, I will present our most recent result - $\\tau_n=877.7\\pm0.7_\\text{(stat.)}+0.4/-0.2_\\text{(sys.)}$~s. I will also present Monte Carlo simulations of systematic effects in the experiment including heating and spectral cleaning.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-10-01T20:13:14.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "magneto-gravitational trap",
      "bottle measurements",
      "axial vector form factor",
      "monte carlo simulations",
      "in-situ neutron detector"
    ],
    "note": {
      "typesetting": "LaTeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}