Bulletin of the American Physical Society
APS April Meeting 2018
Volume 63, Number 4
Saturday–Tuesday, April 14–17, 2018; Columbus, Ohio
Session G11: Mini-Symposium on FRIB and ReA Instrumentation IMini-Symposium
|
Hide Abstracts |
Sponsoring Units: DNP Chair: Benjamin Kay, Argonne National Laboratory Room: A220-221 |
Sunday, April 15, 2018 8:30AM - 9:06AM |
G11.00001: Instrumentation Plans for FRIB and ReA Invited Speaker: Manoel Couder FRIB, the US's "Facility for Rare Isotope Beams" under construction at Michigan State University will be a world-leading rare isotope beam facility. The fast, stopped and re-accelerated beams delivered will allow discoveries in nuclear structure, nuclear astrophysics, tests of fundamental interaction and symmetries and nuclear science for societal benefits. A large number of instruments are being designed, constructed and commissioned to exploit the large amount of rare isotopes produced and accelerated by FRIB. In this this talk, I will give a brief overview of the major FRIB instruments, summarizing their capabilities and status with a special focus on SECAR (the Separator for Capture Reactions), the "flagship experiment for the FRIB nuclear astrophysics community". [Preview Abstract] |
Sunday, April 15, 2018 9:06AM - 9:18AM |
G11.00002: The High Rigidity Spectrometer for FRIB. Remco Zegers The fast-beam program at FRIB has tremendous discovery potential, enabling experiments with beam intensities of a few ions per second or less through the luminosity afforded by thick targets. The High Rigidity Spectrometer (HRS) will become the centerpiece of the fast-beam program: its maximum rigidity (8 Tm) will match the rigidities at which rare-isotope production yields at the FRIB fragment separator are maximum across the entire chart of nuclei and enable experiments with the most neutron-rich nuclei available at FRIB. Gain factors in luminosity of up to 100 or are achievable compared to running with existing spectrometers, which have a maximum rigidity of 4 Tm. The highest luminosity gains are for the most neutron-rich unstable isotopes. The HRS will accommodate different ion-optical modes and provide the flexibility to run in coincidence with a diverse set of other detector systems, such as the Gamma Ray Energy Tracking Array (GRETA) and the Modular Neutron Array (MoNA-LISA). In the presentation, an overview of the scientific opportunities with the HRS and the present layout of the HRS will be given. [Preview Abstract] |
Sunday, April 15, 2018 9:18AM - 9:30AM |
G11.00003: Reaction Studies with a Gas Jet Target at ReA K.A. Chipps Radioactive ion beams have provided new opportunities for reaction measurements in nuclear astrophysics, reactions, and structure; however, the move to inverse kinematics presented unique difficulties, particularly with regard to targets. The use of standard targets such as hydrogen-rich plastic films can worsen experimental resolution and create problematic backgrounds. A recent development toward addressing this issue is the commissioning of the Jet Experiments in Nuclear Structure and Astrophysics (JENSA) gas jet target. The JENSA system provides a pure, homogeneous, highly localized, dense, and robust gaseous target for radioactive ion beam studies. Charged-particle reactions measurements made with gas jet targets can be cleaner and display better resolution than with traditional targets. With the availability of pure and localized gas jet targets in combination with developments in exotic radioactive ion beams and next-generation detector and spectrometer systems, the range of reaction studies that are experimentally possible is vastly expanded. This talk will focus on the benefits of performing reaction measurements with a gas jet target, including discussion of several example cases using JENSA and future applications with SECAR and SOLARIS. [Preview Abstract] |
Sunday, April 15, 2018 9:30AM - 9:42AM |
G11.00004: GODDESS: Gamma arrays and ORRUBA: Dual Detectors for Experimental Structure Studies at FRIB and ReA S.D. Pain, Jolie Cizewski, A. Lepailleur, D. Walter, A. Ratkiewicz With the Facility for Rare Isotope Beams (FRIB) there will be a plethora of opportunities to study transfer reactions on unstable nuclei including those away from shell closures. The Oak Ridge Rutgers University Barrel Array (ORRUBA) is a compact array of position-sensitive silicon-strip detectors that has been exploited to measure charged-particle reactions with beams of rare isotopes up to A=134. ORRUBA can be configured to cover the most important angles needed to measure angular distributions of light reaction particles and deduce spectroscopic factors. (d,p$\gamma$) measurements with GODDESS can also be used to deduce cross sections for neutron capture with the surrogate method. The compact nature of ORRUBA facilitates coupling to arrays of gamma-ray detectors including Gammasphere and GRETINA and the Hybrid Array of Gamma-Ray Detectors (HAGRiD) currently being developed. ORRUBA has also been successfully coupled to heavy recoil magnetic spectrometers such as the S800. This talk will present preliminary results from the first GODDESS campaign [1] and highlight prospects for deploying GODDESS at FRIB and ReA. \\ 1. S.D. Pain et al., Phys. Procedia 90, 455 (2017). [Preview Abstract] |
Sunday, April 15, 2018 9:42AM - 9:54AM |
G11.00005: Advancing Penning trap mass spectrometry of rare isotopes at the LEBIT facility M. Redshaw, G. Bollen, R. Ringle, S. Schwarz, K. Gulyuz, M. Eibach, A. Hamaker, C. Izzo, D. Puentes, J. Surbrook, I. Yandow, R. Sandler The Low-Energy Beam and Ion Trap (LEBIT) facility at the National Superconducting Cyclotron Laboratory (NSCL) remains the only Penning trap mass spectrometry (PTMS) facility to utilize rare isotopes produced via projectile fragmentation. The fast, chemically insensitive rare isotope production method combined with precise and accurate PTMS techniques have enabled mass measurements of short-lived isotopes with precisions of $<$10 ppb across the nuclear chart with applications to fundamental interactions, nuclear structure, and nuclear astrophysics. In order to expand the experimental reach of PTMS to nuclides delivered at very low rates, the new Single Ion Penning Trap (SIPT) has been built. SIPT utilizes a cryogenic trap and electronic detection circuit for narrowband detection and cyclotron frequency measurement of a single ion via its induced image currents. SIPT will be used to perform high-impact measurements on isotopes delivered at rates as low as one ion per day. In combination with the existing 9.4-T time-of-flight mass spectrometer, the 7-T SIPT system will make optimal use of the wide range of isotopes that will be available when FRIB comes online. [Preview Abstract] |
Sunday, April 15, 2018 9:54AM - 10:06AM |
G11.00006: Development, commissioning and first experiment of the HabaNERO detector for the measurement of astrophysically important (a,n) reaction rates Shilun Jin Neutron-rich neutrino driven winds in core-collapse supernovae have been proposed as a possible site for the nucleosynthesis of the relatively high Z$=$38-47 abundances observed in some metal-poor stars. In this scenario, (a,Xn) reactions are the main production mechanism of heavier nuclei once the temperature has decreased in the late phases of the wind. Although it has been shown that the resulting abundances are highly dependent on the rates of these reactions, there is little experimental data for the reactions involved in the nucleosynthesis. The Heavy ion Accelerated Beam induced (Alpha, Neutron) Emission Ratio Observer (HabaNERO) has recently been developed to measure these (a, Xn) reactions of astrophysically interest using the low energy reaccelerated radioactive beams from ReA3 at NSCL, and FRIB in the future. HabaNERO consists of BF3 and $^{\mathrm{3}}$He gas-filled proportional tubes embedded in a polyethylene matrix and is optimized for neutron detection in the energy range of 0.1-19.5 MeV. Detector design, commissioning at Ohio University, and preliminary results from the measurement of the $^{\mathrm{75}}$Ga(a,Xn)As cross sections will be presented. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700