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14 results on '"Mast, Nicholas"'

1. A Search for Low-mass Dark Matter via Bremsstrahlung Radiation and the Migdal Effect in SuperCDMS

Author

SuperCDMS Collaboration, Al-Bakry, Musaab, Alkhatib, Imran, Amaral, Dorian Praia do, Aralis, Taylor, Aramaki, Tsuguo, Arnquist, Isaac, Langroudy, Iman Ataee, Azadbakht, Elham, Banik, Samir, Bathurst, Corey, Bauer, Dan, Bezerra, Lucas, Bhattacharyya, Rik, Brink, Paul, Bunker, Ray, Cabrera, Blas, Calkins, Robert, Cameron, Robert, Cartaro, Concetta, Cerdeno, David, Chang, Yen-Yung, Chaudhuri, Mouli, Chen, Ran, Chott, Nicholas, Cooley, Jodi, Coombes, Harrison, Corbett, Jonathan, Cushman, Priscilla, De Brienne, François, Dharani, Sukeerthi, di Vacri, Maria Laura, Diamond, Miriam, Fascione, Eleanor, Figueroa, Enectali, Fink, Caleb, Fouts, Ken, Fritts, Matt, Gerbier, Gilles, Germond, Richard, Ghaith, Muad, Golwala, Sunil, Hall, Jeter, Hassan, Noah, Hines, Bruce, Hollister, Matt, Hong, Ziqing, Hoppe, Eric, Hsu, Lauren, Huber, Martin, Iyer, Vijay, Jardin, Daniel, Jastram, Andrew, Kashyap, Varchaswi, Kelsey, Michael, Kubik, Andrew, Kurinsky, Noah, Lawrence, Richard, Lee, Matthew, Li, Ashley, Liu, Jasmine, Liu, Yan, Loer, Ben, Lukens, Pat, MacFarlane, David, Mahapatra, Rupak, Mandic, Vuk, Mast, Nicholas, Mayer, Adam, Theenhausen, Hanno Meyer zu, Michaud, Émile, Michielin, Emanuele, Mirabolfathi, Nader, Mohanty, Bedangadas, Nagorny, Serge, Nelson, Jack, Neog, Himangshu, Novati, Valentina, Orrell, John, Osborne, McKay, Oser, Scott, Page, William, Partridge, Richard, Pedreros, David S., Podviianiuk, Ruslan, Ponce, Francisco, Poudel, Sudip, Pradeep, Aditi, Pyle, Matt, Rau, Wolfgang, Reid, Elliott, Ren, Tom, Reynolds, Tyler, Roberts, Amy, Robinson, Alan, Saab, Tarek, Sadoulet, Bernard, Saikia, Ishwita, Sander, Joel, Sattari, Ata, Schmidt, Benjamin, Schnee, Richard, Scorza, Silvia, Serfass, Bruno, Poudel, Sagar Sharma, Sincavage, Derek, Stanford, Chris, Street, Joseph, Sun, Huanbo, Thasrawala, Fatema, Toback, David, Underwood, Ryan, Verma, Shubham, Villano, Anthony, von Krosigk, Belina, Watkins, Samuel, Wen, Osmond, Williams, Zachary, Wilson, Matthew, Winchell, Joshua, Wu, Chih-pan, Wykoff, Kevin, Yellin, Steve, Young, Betty, Yu, To Chin, Zatschler, Birgit, Zatschler, Stefan, Zaytsev, Alexander, Zhang, Enze, Zheng, Lei, and Zuber, Summer

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

In this paper, we present a re-analysis of SuperCDMS data using a profile likelihood approach to search for sub-GeV dark matter particles (DM) through two inelastic scattering channels: bremsstrahlung radiation and the Migdal effect. By considering possible inelastic scattering channels, experimental sensitivity can be extended to DM masses that would otherwise be undetectable through the DM-nucleon elastic scattering channel, given the energy threshold of current experiments. We exclude DM masses down to $220~\textrm{MeV}/c^2$ at $2.7 \times 10^{-30}~\textrm{cm}^2$ via the bremsstrahlung channel. The Migdal channel search excludes DM masses down to $30~\textrm{MeV}/c^2$ at $5.0 \times 10^{-30}~\textrm{cm}^2$., Comment: This paper is being withdrawn due to an error in data selection during the analysis. Although incorrect, the limits are roughly representative of the sensitivity. The new corrected version of the result will be uploaded once ready

Published
2022

4. Energy Loss Due to Defect Formation from $^{206}$Pb Recoils in SuperCDMS Germanium Detectors

Author

Agnese, Robert, Aralis, Taylor, Aramaki, Tsuguo, Arnquist, Isaac, Azadbakht, Elham, Baker, William, Banik, Samir, Barker, D'Ann, Bauer, Dan, Binder, Thomas, Bowles, Michael, Brink, Paul, Bunker, Ray, Cabrera, Blas, Calkins, Robert, Cartaro, Concetta, Cerdeno, David, Chang, Yen-Yung, Cooley, Jodi, Cornell, Brett, Cushman, Priscilla, Di Stefano, Philippe, Doughty, Todd, Fascione, Eleanor, Figueroa, Tali, Fink, Caleb, Fritts, Matt, Gerbier, Gilles, Germond, Richard, Ghaith, Muad, Golwala, Sunil, Harris, Rusty, Hong, Ziqing, Hoppe, Eric, Hsu, Lauren, Huber, Martin, Iyer, Vijay, Jardin, Dan, Jena, Chitrasen, Kelsey, Michael, Kennedy, Allison, Kubik, Andrew, Kurinsky, Noah, Lawrence, Richard, Loer, Ben, Lopez-Asamar, Elias, Lukens, Pat, MacDonell, Danika, Mahapatra, Rupak, Mandic, Vuk, Mast, Nicholas, Miller, Eric, Mirabolfathi, Nader, Mohanty, Bedangadas, Morales, Jorge, Nelson, Jack, Orrell, John, Oser, Scott, Page, William, Partridge, Richard, Pepin, Mark, Ponce, Francisco, Poudel, Sudip, Pyle, Matt, Qiu, Hang, Rau, Wolfgang, Reisetter, Angela, Ren, Tom, Reynolds, Tyler, Roberts, Amy, Robinson, Alan, Rogers, Hannah, Saab, Tarek, Sadoulet, Bernard, Sander, Joel, Scarff, Andrew, Schnee, Richard, Scorza, Silvia, Senapati, Kartik, Serfass, Bruno, Speller, Danielle, Stein, Matthew, Street, Joseph, Tanaka, Hirohisa, Toback, David, Underwood, Ryan, Villano, Anthony, von Krosigk, Belina, Watkins, Samuel, Wilson, Jon, Wilson, Matthew, Winchell, Joshua, Wright, Dennis, Yellin, Steve, Young, Betty, Zhang, Xiaohe, and Zhao, Xuji

Subjects
Physics - Instrumentation and Detectors, Astrophysics - Cosmology and Nongalactic Astrophysics, Physics - Applied Physics
Abstract

The Super Cryogenic Dark Matter Search experiment (SuperCDMS) at the Soudan Underground Laboratory studied energy loss associated with Frenkel defect formation in germanium crystals at mK temperatures using in situ $^{210}$Pb sources. We examine the spectrum of $^{206}$Pb nuclear recoils near its expected 103 keV endpoint energy and determine an energy loss of $\left(6.08\pm0.18\right)$ %, which we attribute to defect formation. From this result and using TRIM simulations, we extract the first experimentally determined average displacement threshold energy of $\left(19.7^{+0.6}_{-0.5}\right)$ eV for germanium. This has implications for the analysis thresholds of future germanium-based dark matter searches., Comment: 4 Figures, Two data files, One data release description file

Published
2018
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13. Cryogenic Detector Development for SuperCDMS

Author

Mast, Nicholas

Abstract

The dark matter (DM) problem is currently one of the most pressing issues facing physics. This thesis presents some of my work and contributions to the detectors employed by the Super Cryogenic Dark Matter Search (SuperCDMS), one of the many experiments currently investigating DM. First, we present an overview of astrophysical and cosmological observations to give insight into our current understanding of DM and its role in the universe. Some potential particle DM candidates are also discussed. Then we describe the SuperCDMS experiment and relevant detector technologies. We go into particular detail in discussing the phonon sensors, deriving the relationships that define their fundamental working principles and describing their practical deployment. We also discuss the main noise contributions to the phonon sensors which can limit experimental sensitivity. We then present some work related to reconstruction of event position in the detectors, including new analysis techniques and a novel cryogenic calibration source mover we have developed and tested. We also present tests of improving experimental scalability by increasing individual detector masses using the largest-diameter cryogenic Si detectors yet operated. We present first experimental results from the novel use of (n,gamma) processes to calibrate the low energy nuclear recoil energy scale. This work is essential to understand how DM-nuclear interactions will manifest in semiconductor detectors. We also take a short look at the newest, most sensitive detectors currently operated by SuperCDMS and discuss how they are allowing new insights into critical physics processes in all SuperCDMS detectors. Finally, we demonstrate how some of the various improvements discussed in this work can improve the experimental reach of the next generation of SuperCDMS at SNOLAB.

Published
2020

14. Potential contribution of femoroacetabular impingement to recurrent traumatic hip dislocation.

Author

Manner HM, Mast NH, Ganz R, and Leunig M

Subjects
Acetabulum diagnostic imaging, Acetabulum pathology, Adolescent, Cartilage, Articular injuries, Cartilage, Articular surgery, Femoracetabular Impingement diagnostic imaging, Femoracetabular Impingement surgery, Hip Dislocation diagnostic imaging, Hip Dislocation surgery, Hip Injuries diagnostic imaging, Hip Injuries surgery, Humans, Male, Osteotomy methods, Radiography, Recurrence, Treatment Outcome, Femoracetabular Impingement complications, Hip Dislocation etiology, Hip Injuries complications
Abstract

A 16-year-old boy sustained a traumatic posterior dislocation of the right hip. After initial closed reduction, the hip spontaneously redislocated within 2 days. Four days after the initial dislocation, the patient was transferred to the authors' institution, where a radiographic workup showed a severe capsular and labral disruption from the posterior aspect of the acetabulum. Subsequently, the patient underwent operative treatment using the technique of surgical hip dislocation through a digastric osteotomy as described by Ganz. Using this approach, the avulsed capsulolabral complex as well as the pathological head-neck junction, which is suspected to be a lever for the femoral head, could be fully addressed. The authors recommend further radiographic studies to evaluate the underlying pathology in traumatic dislocation of the hip as well as the described surgical approach, which leads to successful treatment of the entire pathology., (© 2012 Wolters Kluwer Health | Lippincott Williams & Wilkins.)

Published
2012
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