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Title: Solving The Longstanding Problem Of Low-Energy Nuclear Reactions At the Highest Microscopic Level - Final Report

Abstract

A 2011 DOE-NP Early Career Award (ECA) under Field Work Proposal (FWP) SCW1158 supported the project “Solving the Long-Standing Problem of Low-Energy Nuclear Reactions at the Highest Microscopic Level” in the five-year period from June 15, 2011 to June 14, 2016. This project, led by PI S. Quaglioni, aimed at developing a comprehensive and computationally efficient framework to arrive at a unified description of structural properties and reactions of light nuclei in terms of constituent protons and neutrons interacting through nucleon-nucleon (NN) and three-nucleon (3N) forces. Specifically, the project had three main goals: 1) arriving at the accurate predictions for fusion reactions that power stars and Earth-based fusion facilities; 2) realizing a comprehensive description of clustering and continuum effects in exotic nuclei, including light Borromean systems; and 3) achieving fundamental understanding of the role of the 3N force in nuclear reactions and nuclei at the drip line.

Authors:
 [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1330755
Report Number(s):
LLNL-TR-703549
TRN: US1700467
DOE Contract Number:
AC52-07NA27344
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; NEUTRONS; PROTONS; THERMONUCLEAR REACTIONS; LIGHT NUCLEI; NUCLEAR MODELS; NUCLEAR STRUCTURE; NUCLEON-NUCLEON POTENTIAL; THREE-BODY PROBLEM

Citation Formats

Quaglioni, S. Solving The Longstanding Problem Of Low-Energy Nuclear Reactions At the Highest Microscopic Level - Final Report. United States: N. p., 2016. Web. doi:10.2172/1330755.
Quaglioni, S. Solving The Longstanding Problem Of Low-Energy Nuclear Reactions At the Highest Microscopic Level - Final Report. United States. doi:10.2172/1330755.
Quaglioni, S. 2016. "Solving The Longstanding Problem Of Low-Energy Nuclear Reactions At the Highest Microscopic Level - Final Report". United States. doi:10.2172/1330755. https://www.osti.gov/servlets/purl/1330755.
@article{osti_1330755,
title = {Solving The Longstanding Problem Of Low-Energy Nuclear Reactions At the Highest Microscopic Level - Final Report},
author = {Quaglioni, S.},
abstractNote = {A 2011 DOE-NP Early Career Award (ECA) under Field Work Proposal (FWP) SCW1158 supported the project “Solving the Long-Standing Problem of Low-Energy Nuclear Reactions at the Highest Microscopic Level” in the five-year period from June 15, 2011 to June 14, 2016. This project, led by PI S. Quaglioni, aimed at developing a comprehensive and computationally efficient framework to arrive at a unified description of structural properties and reactions of light nuclei in terms of constituent protons and neutrons interacting through nucleon-nucleon (NN) and three-nucleon (3N) forces. Specifically, the project had three main goals: 1) arriving at the accurate predictions for fusion reactions that power stars and Earth-based fusion facilities; 2) realizing a comprehensive description of clustering and continuum effects in exotic nuclei, including light Borromean systems; and 3) achieving fundamental understanding of the role of the 3N force in nuclear reactions and nuclei at the drip line.},
doi = {10.2172/1330755},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 9
}

Technical Report:

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  • The aim of this project is to develop a comprehensive framework that will lead to a fundamental description of both structural properties and reactions of light nuclei in terms of constituent protons and neutrons interacting through nucleon-nucleon (NN) and three-nucleon (3N) forces. This project will provide the research community with the theoretical and computational tools what will enable: an accurate prediction for fusion reactions that power stars and Earth-based fusion facilities; an improved description of the spectroscopy of exotic nuclei, including light Borromean systems; and, a fundamental understanding of the three-nucleon force in nuclear reaction and nuclei at the dripmore » line.« less
  • The aim of this project is to develop a comprehensive framework that will lead to a fundamental description of both structural properties and reactions of light nuclei in terms of constituent protons and neutrons interacting through nucleon-nucleon (NN) and three-­nucleon (NNN) forces. This project will provide the research community with the theoretical and computational tools that will enable: (1) an accurate prediction for fusion reactions that power stars and Earth-­based fusion facilities; (2) an improved description of the spectroscopy of exotic nuclei, including light Borromean systems; and (3) a fundamental understanding of the three-­nucleon force in nuclear reactions and nucleimore » at the drip line. To achieve this goal, we build upon a promising technique emerged recently as a candidate to reach a fundamental description of low-­energy binary reactions between light ions, that is the ab initio no-­core shell model combined with the resonating-­group method (NCSM/RGM). This approach has demonstrated the capability to describe binary reactions below the three-­body breakup threshold based, up to now, on similarity-­renormalization-­group (SRG) 5 evolved NN only potentials. To advance the understanding of nuclear reactions at low energies and light exotic nuclei, this project aims at extending the NCSM/RGM approach to include the full range of NNN interactions as well as the treatment of three-­cluster bound and continuum states. Three-­nucleon interactions are unavoidable components of a fundamental nuclear Hamiltonian obtained in a low-­energy effective theory. In addition, three-­nucleon force terms are induced by the SRG procedure and have to be taken into account for such a transformation to be unitary in many-­body calculations. At the same time, the introduction of three-­body cluster states is key to achieve a microscopic description of Borromean systems as well as three-­body breakup reactions. This project will both enhance the fundamentality and enlarge the scope of our microscopic description of nuclear properties. A successful completion of this project will result in improved accuracy of the 3He( 3He,2p) 4He and 3He(α,γ) 7Be reaction rates and consequently, in enhancement of the predictive capability of the standard solar model. In addition, we will study also the mirror reactions 3H( 3H,2n) 4He and 3H(α,γ) 7Li (a key reaction for the production of 7Li in the standard big-­bang nucleosynthesis), and the spectroscopy of the 6He, 6Be, and 11Li nuclei.« less
  • Experiments were carried out to measure charge collection resulting from exposure of Rockwell Fat-FET test structures to alphas, heavy ions, and protons. The alpha and heavy-ion data were used to determine the dimensions of the sensitive volume following techniques outlined in Appendix A. Charge-collection measurements in Si PIN photodiodes were carried out. This represents the first test of the ability of the CUPID codes to handle partially depleted n-p junctions. Measurements were made with two devices. The UV-100 PIN photodiode from EG+G had a sensitive volume which was only partially depleted even at high voltages, the YAG 444 is fullymore » depleted over its thickness (400 um) when fully biased but the depletion width is substantially reduced for low biases.« less