Bulletin of the American Physical Society
2017 Fall Meeting of the APS Division of Nuclear Physics
Volume 62, Number 11
Wednesday–Saturday, October 25–28, 2017; Pittsburgh, Pennsylvania
Session DE: From Quarks to Nuclei |
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Chair: David Dean, Oak Ridge National Laboratory Room: Salon 5 |
Thursday, October 26, 2017 10:30AM - 11:06AM |
DE.00001: What have we learned from jets in heavy ion collisions Invited Speaker: Christine Nattrass The Quark-Gluon Plasma (QGP) is created in high energy heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). The properties of this medium is transparent to electromagnetic probes but nearly opaque to colored probes. Hard partons fragment and hadronize into a collimated spray of particles called a jet. The partons lose energy as they traverse the medium, a process called jet quenching. Most of the lost energy is still correlated with the parent parton, contributing to particle production at larger angles and lower momenta relative to the parent parton than in proton-proton collisions. This partonic energy loss can be measured through several observables, each of which give different insights into the degree and mechanism of energy loss. The measurements to date are summarized and the path forward is discussed. [Preview Abstract] |
Thursday, October 26, 2017 11:06AM - 11:42AM |
DE.00002: Nuclear physics from Lattice QCD Invited Speaker: Phiala Shanahan I will discuss the current state and future scope of numerical Lattice Quantum Chromodynamics (LQCD) calculations of nuclear matrix elements. The goal of the program is to provide direct QCD calculations of nuclear observables relevant to experimental programs, including double-beta decay matrix elements, nuclear corrections to axial matrix elements relevant to long-baseline neutrino experiments and nuclear sigma terms needed for theory predictions of dark matter cross-sections at underground detectors. I will discuss the progress and challenges on these fronts, and also address recent work constraining a gluonic analogue of the EMC effect, which will be measurable at a future electron-ion collider. [Preview Abstract] |
Thursday, October 26, 2017 11:42AM - 12:18PM |
DE.00003: Measurement of the most exotic beta-delayed neutron emitters at N=50 and N=126 Invited Speaker: Iris Dillmann Beta-delayed neutron ($\beta$n)-emission will be the dominant decay mechanism of neutron-rich nuclei and plays an important role in the stellar nucleosynthesis of heavy elements in the "r process". It leads to a detour of the material $\beta$-decaying back to stability and the released neutrons increase the neutron-to-seed ratio, and are re-captured during the freeze-out phase and thus influence the final solar r-abundance curve. Thus the neutron branching ratio of very neutron-rich isotopes is a crucial parameter in astrophysical simulations. In addition, $\beta$-decay half-lives can be deduced from the time-dependent detection of $\beta$n's. I will talk about two recent experimental campaigns. The neutron detector BELEN was used at GSI Darmstadt to measure half-lives and neutron-branching ratios of the heaviest presently accessible $\beta$n-emitters at N=126. For isotopes between $^{204}$Au and $^{220}$Bi nine half-lives and eight neutron-branching ratios were measured for the first time and provide an important input for benchmarking theoretical models in this mass region. Its successor is the BRIKEN detector ("Beta-delayed neutron measurements at RIKEN for nuclear structure, astrophysics, and applications"), the most efficient neutron detector used so far for nuclear structure studies. In conjunction with two clover detectors and the "Advanced Implantation Detector Array" (AIDA) the setup has been used a few months ago to measure the most neutron-rich isotopes around $^{78}$Ni, $^{132}$Sn, and the Rare Earth Region. Some preliminary results are shown from the campaign covering the $^{78}$Ni region where the neutron-branching ratio of $^{78}$Ni and $\approx$28 more isotopes were measured for the first time, as well as the half-lives of $\approx$20 isotopes. The BRIKEN campaign aims to (re-)measure almost all $\beta$n-emitters between $^{76}$Co and $^{167}$Eu, many of them for the first time. An extension of the campaign to lighter masses is planned. [Preview Abstract] |
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