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1. Nuclear structure and direct reaction studies in particle-γ coincidence experiments at the FSU John D. Fox superconducting linear accelerator laboratory

   https://doi.org/10.3389/fphy.2024.1511394  

   Spieker, Mark-Christoph; Almaraz-Calderon, Sergio (December 2024, Frontiers in Physics)

   Kay, Benjamin (Ed.)

   Since its foundation in the 1960s, the John D. Fox Superconducting Linear Accelerator Laboratory at Florida State University (FSU) pursued research at the forefront of nuclear science. In this contribution, we present recent highlights from nuclear structure and reaction studies conducted at the John D. Fox Superconducting Linear Accelerator Laboratory, also featuring the general experimental capabilities at the laboratory for particle- $\gamma$coincidence experiments. Specifically, we focus on light-ion induced reactions measured with the Super-Enge Split-Pole Spectrograph (SE-SPS) and the CATRiNA neutron detectors, respectively. Some results obtained with the CeBrA demonstrator for particle- $\gamma$coincidence experiments at the SE-SPS are presented. A highlight from the first experimental campaigns with the combined CLARION2-TRINITY setup, showing that weak reaction channels can be selected, is discussed as well. 

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2. Level lifetimes in ⁵² Cr from DSAM following inelastic neutron scattering: Implications for shape coexistence and E 0 strengths

   https://doi.org/10.1051/epjconf/202532901011  

   Dowie, JTH; Kibédi, T; Peters, EE; Yates, SW (January 2025, EPJ Web of Conferences)

   Jentschel, M (Ed.)

   Nuclear shape coexistence is a widespread but not yet well understood phenomenon. Electric monopole (E0) transitions are a particularly sensitive probe of shape coexistence. The firstE0measurements on the Cr isotopes were performed at The Australian National University, but were hampered by missing and imprecise data of the key spectroscopic quantities such as level lifetimes. To address these needs, the low-lying states in⁵²Cr were investigated at the University of Kentucky Accelerator Laboratory with inelastic neutron scattering. γ-ray angular distribution and excitation function measurements were performed to determine level lifetimes, spins and parities, transition mixing ratios, and γ-ray branching ratios. We present new level lifetimes for three states in⁵²Cr along with the implications for E0 transition strengths and shape coexistence in⁵²Cr. 

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3. Recent Progress in the Development of a-Se/CMOS Sensors for X-ray Detection

   https://doi.org/10.3390/qubs5040029  

   Hellier, Kaitlin; Benard, Emmie; Scott, Christopher C.; Karim, Karim S.; Abbaszadeh, Shiva (December 2021, Quantum Beam Science)

   Amorphous selenium (a-Se) is a glass-former capable of deposition at high rates by thermal evaporation over a large area. It was chosen as a direct conversion material due to its appealing properties for imaging in both low and high X-ray energy ranges (<30 keV and <30 keV, respectively). It has a bandgap of 2.2 eV and can achieve high photodetection efficiency at short wavelengths less than 400 nm which makes it appealing for indirect conversion detectors. The integration of a-Se with readout integrated circuits started with thin-film transistors for digital flat panel X-ray detectors. With increasing applications in life science, biomedical imaging, X-ray imaging, high energy physics, and industrial imaging that require high spatial resolution, the integration of a-Se and CMOS is one direct way to improve the high-contrast visualization and high-frequency response. Over the past decade, significant improvements in a-Se/CMOS technologies have been achieved with improvements to modulation transfer function and detective quantum efficiency. We summarize recent advances in integrating and photon-counting detectors based on a-Se coupled with CMOS readout and discuss some of the shortcomings in the detector structure, such as low charge conversion efficiency at low electric field and high dark current at high electric field. Different pixel architectures and their performance will be highlighted. 

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4. The Nuclear Structure of ⁷⁴ Ge from Inelastic Neutron Scattering

   https://doi.org/10.1051/epjconf/202532901005  

   Peters, E E; Yates, S W; Brown, B A; Ramirez, A_P D; Mukhopadhyay, S (January 2025, EPJ Web of Conferences)

   Jentschel, M (Ed.)

   The low-lying structure of⁷⁴Ge has been studied with γ-ray detection following inelastic neutron scattering. From excitation function and angular distribution data, the levels and transitions have been characterized including level spins and lifetimes, branching ratios, and multipole mixing ratios. In addition, a number of levels found in the literature for⁷⁴Ge appear to be erroneously placed. Upon removal of these states from the level scheme, excellent agreement with large-scale shell-model calculations was obtained. 

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5. Unveiling New States in ⁹⁸ Zr: Insights from β -decay and γ-γ Angular-Correlation Studies

   https://doi.org/10.1051/epjconf/202532901012  

   Mashtakov, K R; Garrett, P E; Olaizola, B; Andreoiu, C; Ball, G C; Bender, P; Bildstein, V; Chester, A; Cross, D S; Dawkins, H; et al (January 2025, EPJ Web of Conferences)

   Jentschel, M (Ed.)

   The nuclear structure of the⁹⁸Zr nucleus was studied through theβ⁻decay of⁹⁸Y_g.s.at the TRIUMF-ISAC facility. The use of the 8π γ-ray spectrometer with its ancillary detectors SCEPTAR and PACES enabled γ-γ and γ-e⁻coincidence measurements as well as γ-γ angular correlations. The level spin assignments and transition mixing ratios obtained in this study were in good agreement with previous results. Furthermore, 12 previously unknown states in the low-energy region of⁹⁸Zr were identified, including the 0⁺₅and 0⁺₆levels at 2418 and 2749 keV, respectively. The 2⁺and I=1 natures for multiple newly observed and previously known (but not firmly assigned) states have been established. Additionally, the previously assumed pureE2 character of the 2⁺₂→ 2⁺₁367.8-keV transition was confirmed. 

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