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  1. Abstract A workshop on The Next Generation Gamma-Ray Source sponsored by the Office of Nuclear Physics at the Department of Energy, was held November 17-19, 2016 in Bethesda, Maryland. The goals of the workshop were to identify basic and applied research opportunities at the frontiers of nuclear physics that would be made possible by the beam capabilities of an advanced laser Compton beam facility. To anchor the scientific vision to realistically achievable beam specifications using proven technologies, the workshop brought together experts in the fields of electron accelerators, lasers, and optics to examine the technical options for achieving the beammore »specifications required by the most compelling parts of the proposed research programs. An international assembly of participants included current and prospective γ -ray beam users, accelerator and light-source physicists, and federal agency program managers. Sessions were organized to foster interactions between the beam users and facility developers, allowing for information sharing and mutual feedback between the two groups. The workshop findings and recommendations are summarized in this whitepaper.« less
    Free, publicly-accessible full text available December 2, 2022
  2. K–12 schools across the United States have been challenged to make programmatic shifts to meet the needs of youth and their families during the COVID-19 pandemic. Due to both structure and existing connections to youth and families, many out-of-school learning (OSL) programs, including Pre-College STEM Programs (PCSPs), are nimbler and have the ability to be more responsive. The STEM PUSH Network (a National Science Foundation INCLUDES Alliance; https://stempushnetwork.org)—which brings together PCSPs as part of a national collaborative of programs and citywide STEM Ecosystems focused on program improvement and college admissions—revealed some of the ways programs have adjusted during COVID- 19,more »as well as the ways systematic cross-program collaboration can enhance this work.« less
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  5. The motion of a mechanical object, even a human-sized object, should be governed by the rules of quantum mechanics. Coaxing them into a quantum state is, however, difficult because the thermal environment masks any quantum signature of the object’s motion. The thermal environment also masks the effects of proposed modifications of quantum mechanics at large mass scales. We prepared the center-of-mass motion of a 10-kilogram mechanical oscillator in a state with an average phonon occupation of 10.8. The reduction in temperature, from room temperature to 77 nanokelvin, is commensurate with an 11 orders-of-magnitude suppression of quantum back-action by feedback andmore »a 13 orders-of-magnitude increase in the mass of an object prepared close to its motional ground state. Our approach will enable the possibility of probing gravity on massive quantum systems.

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    Free, publicly-accessible full text available June 18, 2022
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