Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session JJ: Instrumentation IV |
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Chair: Thomas Redpath, FRIB/NSCL Room: Tremont |
Wednesday, October 13, 2021 9:30AM - 9:42AM |
JJ.00001: Recent results of spectrum unfolding of the CATRiNA detectors Ashton B Morelock, Jesus F Perello, Sergio J Almaraz-Calderon, Thomas Massey, Zachary P Meisel, Benjamin W Asher, Kristyn H Brandenburg, Joseph Derkin, Gulakhshan M Hamad, Yenuel Jones-Alberty, Eilens Lopez Saavedra, Nisha Singh, Douglas B Soltesz, Shiv K Subedi, Alexander Voinov, Justin Warren The CATRiNA deuterated neutron detector array at FSU has been expanded to include 16 additional EJ315 detectors, making it a powerful and sensitive neutron detector array. Neutron energies can be extracted using their pulse-height spectrum through a method known as spectrum unfolding. Characterization of the array was performed at the Edwards Accelerator Laboratory at Ohio University via reactions 9Be(d,n) and 27Al(d,n). Extraction of spectroscopic information from the 12C(d,n) reaction was also performed. In this work, results of these experiments and upgrades to the spectrum unfolding algorithm will be presented. |
Wednesday, October 13, 2021 9:42AM - 9:54AM |
JJ.00002: The BEtA Recoil-ion trap (BEARtrap): An ion trap dedicated to $\beta$-delayed neutron studies using recoil-ion time-of-flight spectroscopy Graeme Morgan, Scott T Marley, Gemma L Wilson, Sudarsan Balakrishnan, Sergio Lopez, Jason A Clark, Guy Savard, Adrian A Valverde, Nicholas D Scielzo Information on the decay properties of isotopes that undergo $\beta$-delayed neutron ($\beta$n) emission, such as the probability of neutron emission and the energy spectrum of the emitted neutron, is needed to gain a better understanding of the production of heavy elements in the cosmos, energy generation in nuclear reactors, and the fission-product signatures used for stockpile stewardship. The BEtA Recoil-ion trap (BEARtrap) at Argonne National Laboratory will be the first apparatus dedicated to studying $\beta$n emission through recoil-ion time-of-flight spectroscopy. This technique involves surrounding a cloud of ions held in a Paul trap with array of microchannel plate detectors, plastic scintillator telescopes, and high purity germanium detectors. This allows information on the neutron in the decay to be inferred by detection of the recoiling daughter and beta particle where both the probability of $\beta$n and the neutron energy spectrum can be obtained. The design of the trap structure and detector system, a summary on detector performance, and a discussion on commissioning plans will be presented. |
Wednesday, October 13, 2021 9:54AM - 10:06AM |
JJ.00003: iCAPS, the integrated Cologne Argonne Plunger Setup Claus Mueller Gatermann, Michael P Carpenter, Walter Reviol, Dariusz Seweryniak, Marco Siciliano, John T Anderson, Alfred Dewald, Christoph Fransen, Marcel Beckers, Stefan Thiel Plunger devices are used worldwide to measure the lifetime of excited nuclear states on the order of hundreds of femto- to picoseconds. Deduced transition probabilities are used to test and refine nuclear models. A new very compact plunger device has been built, which retains the efficiency of detector setups at Argonne National Laboratory (ANL). The current setups for gamma-ray spectroscopy at ANL are Gammasphere and GRETINA. They are world-class in their efficiency and can be combined with ancillary particle detectors. For example, Neutron Shell is available for neutron detection and is placed outside the reaction chamber, whereas charged-particle detectors like Microball have to be placed around the target inside the vacuum chamber. The construction approach allows to simultaneously accommodate large area charged-particle-detector arrays to the plunger device. When moving to more and more exotic nuclei via weak reaction channels, the channel selectivity using ancillary detectors becomes the key ingredient for successfully untangling these rare events from other stronger reaction channels. The talk will cover design constrains as well as features like an active feedback system to compensate for beam induced changes of the target to degrader distance. |
Wednesday, October 13, 2021 10:06AM - 10:18AM |
JJ.00004: Performance of the Neutron dEtector with Xn Tracking (NEXT). Shree K Neupane, Joseph Heideman, Robert Grzywacz, Noritaka Kitamura, Kate L Jones, Kevin Siegl, Joshua Hooker, Cory R Thornsberry, Lawrence H Heilbronn, Mustafa M Rajabali, Nathan Brewer, Charlie C Rasco, Krzysztof Rykaczewski, Thomas King, Yenuel Alberty-Jones, Joseph Derkin, Thomas Massey, Douglas B Soltesz A new neutron detector with tracking capabilities has been constructed, characterized, and tested in decay and reaction experiments. The interaction position localization capability enables improvement in energy resolution and detection efficiency in the neutron time-of-flight measurement. An efficient neutron detection system with good energy resolution is required to correctly characterize decays of neutron-rich nuclei where beta-delayed neutron emission is a dominant decay mode. Precision neutron spectroscopy instrumentation is essential to probe nuclear structure effects in neutron-rich nuclei in new generation radioactive beam facilities. The new detector is expected to fulfill this role, and the first performance studies of this detector showed very promising results. Presently a small array is constructed and undergoing test with radioactive beams. |
Wednesday, October 13, 2021 10:18AM - 10:30AM |
JJ.00005: Abstract Withdrawn
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Wednesday, October 13, 2021 10:30AM - 10:42AM |
JJ.00006: Abstract Withdrawn
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Wednesday, October 13, 2021 10:42AM - 10:54AM |
JJ.00007: Use of a CeBr3 implantation scintillator for fast-timing measurements in beta-decay studies of rare isotopes near the N=20 island of inversion Timilehin H Ogunbeku, Benjamin P Crider, Sean N Liddick, Aaron Chester, Katherine L Childers, Partha Chowdhury, Edward Lamere, Rebecca Lewis, Brenden Longfellow, Stephanie Lyons, Shree K Neupane, David Perez-Loureiro, Christopher J Prokop, Andrea L Richard, Umesh Silwal, Durga P Siwakoti, Dylan C Smith, Mallory K Smith, Yongchi Xiao Understanding changes in nuclear structure as a function of proton and neutron number is critical to develop a predicative model of the atomic nucleus. Nuclear transition rates can be used as sensitive probes of underlying nuclear configurations. One method to measure longer-lived half-lives is through the direct measurement of the time delay between two emitted radiations following β decay. A β-decay experiment was performed at the National Superconducting Cyclotron Laboratory (NSCL) where radioactive nuclei were implanted within a thin CeBr3 scintillator and a variety of states in daughter nuclei were subsequently populated. The CeBr3 scintillator, coupled to a position-sensitive photomultiplier tube (PSPMT) was chosen due to its superior energy resolution compared to thick plastic scintillators which were used in previous experiments. Sixteen high-purity Ge detectors were situated around the CeBr3 for γ-ray detection as well as 15 LaBr3(Ce) detectors ideal for fast-timing measurements. Preliminary results obtained using β-γ, β-γ-γ and γ-γ timing methods will be presented. |
Wednesday, October 13, 2021 10:54AM - 11:06AM |
JJ.00008: Identification of new actinide isotopes with FIONA Rodney Orford, Jacklyn Gates, Jennifer L Pore, John Gooding, Mallory McCarthy, Mark A Stoyer At the 88-inch cyclotron facility of Lawrence Berkeley National Laboratory the nuclear properties of exotic heavy elements are studied using the FIONA (for the identification of nuclide A) apparatus coupled to the Berkeley Gas-filled Separator (BGS). Actinide and transactinide isotopes created in fusion-evaporation reactions are collected using the BGS and either delivered to a detector station where their decay properties can be examined or they are injected into FIONA for A/q identification. The FIONA system is responsible for stopping, bunching, and accelerating ions coming from the BGS and efficiently transporting them to a low-background experimental area where their mass numbers are unambiguously identified using a trochoidal spectrometer, capable of a mass resolving power up to m/△m = 300. By direct observation of the mass number we are able to differentiate between neighboring isotopes and accurately assign them to their respective alpha decay properties observed at the BGS focal plane. Here, we will describe the FIONA apparatus and highlight recent experimental campaigns, including a search for new proton-rich isotopes of einsteinium (Z = 99). |
Wednesday, October 13, 2021 11:06AM - 11:18AM |
JJ.00009: Monitoring Radiation Damages of the Silicon Photomultipliers (SiPMs) used as readouts for the Forward Calorimeter System at STAR. Ananya Paul, Akio Ogawa The STAR detector at RHIC, BNL is currently undergoing an upgrade with a new calorimeter system and a tracking system in the forward 2.5<η<4 rapidity region. This upgrade is mainly driven to explore QCD physics in the high or low region of x. The Forward Calorimeter System (FCS) consists of the refurbished PHENIX Shashlyk Lead Scinitillator (Pb/Sc) Electromagnetic Calorimeter (EMCal) followed by an iron and scintilltor (Fe/Sc) sampling Hadronic Calorimeter (HCal). The readout for both these calorimeters are fast and compact silicon photomultipliers (SiPMs). This study is dedicated to the monitoring of radiation damage to the SiPMs. Such damage would lead to an increase in the leakage currents over time, resulting in increased noise in the SiPMs. This would degrade the performance of the detector and might require a change in the bias setting on SiPMs to preserve linearity. This monitoring tool also is essential for identifying bad SiPMs/FEE cards and replacing them. Finally, it acts as a good feedback to the accelerator for tuning the beam conditions in cases of abnormal leakage current patterns during runs. A comparison with radiation damage seen in previous runs will also be presented. |
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