Long-Lived Alpha Decay ; The Electron-Ion Collider: Science program and detector development opportunities

by Heinrich Wilsenach ; Or Hen

Tel Aviv University; MIT
at Special seminar

Mon, 25 Apr 2022, 15:15
Sacta-Rashi Building for Physics (54), room 207


15:15 - 15:30 Refreshments

15:30 - 16:30 "Long-Lived Alpha Decay"

Wilsenach, Heinrich
Tel Aviv University

Abstract: The radioactive dating technique is one of the most powerful tools
used to determine the age of materials. This information is vital to our
understanding of the formation of the world around us. One
branch of dating techniques uses long-lived alpha decaying isotopes to
determine materials' formation time and composition.

As mass separation techniques become more sensitive, adding more dating systems
from different isotopes or even combining existing systems
is possible. One major hindrance to these efforts is the quality of
nuclear data.

The work that will be presented here is focused on the improvement of half-life
values for radioactive dating. Measuring radioactive nuclides with half-lives
much longer than the age of the Universe helps to
achieve this goal. This work will present an ionisation chamber specifically
designed for this purpose.

State-of-the-art Monte Carlo techniques have been used to simulate the chamber
down to the pulse shape level. This method has been used to define rigorous
data cuts, resulting in a high background suppression
level. The measurements of the half-lives of 190Pt, 147Sm, and 210Po will be
presented. These measurements employ solid-state techniques that are able to
characterise the sample geometry to nanometer
precision. In addition, the re-measurement of the 144Sm(α,γ)148Gd
nucleosynthesis cross-section will also be presented.

16:30 - 17:00 Coffee break

17:00 - 18:00 !!!(virtual)!!!

"The Electron-Ion Collider: Science program and detector development

Or Hen

Protons and neutrons are the fundamental building blocks of atomic nuclei that
make up essentially all the visible matter in the universe. Over 50 years of
studies revealed that nucleons are composed of quarks and gluons whose
interactions and dynamics are governed by Quantum Chromodynamics (QCD).
However, due to the intrinsic complexity of many-body QCD, many profound
questions remain open. These include the emergent of nucleon spin and mass,
the QCD origin of nuclear interactions, the three-dimensional structure of
nucleons and nuclei, and the properties of low-temperature dense gluonic
matter. Developing a deeper understanding of these questions is one of the
grand challenges of modern science. In this talk I will discuss how these
questions will be addressed by the Electron-Ion Collider (EIC), which the
US Department of Energy recently approved for construction at Brookhaven National Lab.
Following an overview of the scientific program, I will present the design of
the EIC detector and opportunities for international and Israeli collaboration.

Created on 24-04-2022 by Citron, Zvi (zhcitron)
Updaded on 24-04-2022 by Citron, Zvi (zhcitron)