Detector instrumentation is at the heart of scientific discoveries. Cutting edge technologies enable US particle physics to play a leading role worldwide. This report summarizes the current status of instrumentation for High Energy Physics (HEP), the challenges and needs of future experiments and indicates high priority research areas. The Snowmass Instrumentation Frontier studies detector technologies and Research and Development (R&D) needed for future experiments in collider physics, neutrino physics, rare and precision physics and at the cosmic frontier. It is divided into more or less diagonal areas with some overlap among a few of them. We lay out five high-level key messages that are geared towards ensuring the health and competitiveness of the US detector instrumentation community, and thus the entire particle physics landscape.

We present an overview of a small-scale tracer migration experiment that was carried out in July 2018 at the Nevada National Security Site. This experiment involved the injection of 133Xe into the bottom of a shallow borehole with multiple sampling intervals. Sampling was then conducted in the injection borehole and in a second borehole located 17 m from the injection site. A simple system for measurement of the 133Xe activity in whole air was utilized onsite. Though many samples were well below MDC, cross-hole tracer transport was observed. Along with experimental results, additional insights gained from numerical modeling are presented.

S. Jia, C. P. Shen , C. Z. Yuan, X. L. Wang, I. Adachi, H. Aihara, D. M. Asner, H. Atmacan, V. Aulchenko, R. Ayad, V. Babu, I. Badhrees, A. M. Bakich, P. Behera, B. Bhuyan, T. Bilka, J. Biswal, A. Bobrov, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, L. Cao, D. Červenkov, P. Chang, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, G. De Nardo, F. Di Capua, S. Di Carlo, Z. Doležal, T. V. Dong, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, K. Hayasaka, H. Hayashii, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W.W. Jacobs, Y. Jin, K. K. Joo, K. H. Kang, G. Karyan, H. Kichimi, B. H. Kim, C. H. Kim, D. Y. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, R. Kroeger, P. Krokovny, R. Kulasiri, A. Kuzmin, Y.-J. Kwon, K. Lalwani, J. S. Lange, I. S. Lee, S. C. Lee, P. Lewis, C. H. Li, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, C. MacQueen, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, K. Miyabayashi, H. Miyata, R. Mizuk, R. Mussa, K. J. Nath, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, T. Pang, S. Pardi, H. Park, S.-H. Park, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, E. Prencipe, M. T. Prim, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, L. Santelj, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, J.-G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, Z. S. Stottler, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, S. Uno, Y. Usov, R. Van Tonder, G. Varner, A. Vinokurova, V. Vorobyev, C. H. Wang, M.-Z. Wang, M. Watanabe, E. Won, S. B. Yang, H. Ye, J. H. Yin, Z. P. Zhang, V. Zhilich, V. Zhukova, and V. Zhulanov

Y.-T. Lai, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, V. Babu, I. Badhrees, A. M. Bakich, V. Bansal, P. Behera, C. Beleño, B. Bhuyan, T. Bilka, J. Biswal, A. Bobrov, A. Bozek, M. Bračko, L. Cao, D. Červenkov, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, N. Dash, S. Di Carlo, Z. Doležal, T. V. Dong, S. Eidelman, D. Epifanov, J. E. Fast, A. Frey, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, M. Gelb, A. Giri, P. Goldenzweig, D. Greenwald, Y. Guan, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, W.-S. Hou, C.-L. Hsu, K. Huang, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, S. Jia, Y. Jin, D. Joffe, A. B. Kaliyar, G. Karyan, T. Kawasaki, H. Kichimi, C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, R. Kumar, A. Kuzmin, Y.-J. Kwon, K. Lalwani, J. S. Lange, I. S. Lee, J. K. Lee, J. Y. Lee, S. C. Lee, C. H. Li, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, Z. Liptak, D. Liventsev, P.-C. Lu, M. Lubej, T. Luo, J. MacNaughton, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, K. Miyabayashi, R. Mizuk, G. B. Mohanty, T. Mori, M. Mrvar, R. Mussa, E. Nakano, M. Nakao, K. J. Nath, M. Nayak, N. K. Nisar, S. Nishida, S. Ogawa, G. Pakhlova, B. Pal, S. Pardi, H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, E. Prencipe, A. Rabusov, M. Ritter, A. Rostomyan, G. Russo, Y. Sakai, M. Salehi, S. Sandilya, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, O. Seon, M. E. Sevior, C. P. Shen, T.-A. Shibata, J.-G. Shiu, E. Solovieva, M. Starič, M. Sumihama, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, K. Tanida, Y. Tao, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, R. Van Tonder, G. Varner, K. E. Varvell, V. Vorobyev, B. Wang, C. H. Wang, M.-Z. Wang, P. Wang, X. L. Wang, E. Widmann, E. Won, H. Yamamoto, S. B. Yang, H. Ye, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhukova, and V. Zhulanov

Y. Li, Y. B. Li, C. P. Shen , I. Adachi, H. Aihara, D. M. Asner, H. Atmacan, V. Aulchenko, R. Ayad, V. Babu, I. Badhrees, A. M. Bakich, P. Behera, T. Bilka, J. Biswal, A. Bobrov, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, L. Cao, D. Červenkov, P. Chang, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, G. De Nardo, F. Di Capua, S. Di Carlo, Z. Doležal, T. V. Dong, S. Eidelman, J. E. Fast, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, B. Grube, T. Hara, K. Hayasaka, H. Hayashii, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W.W. Jacobs, S. Jia, Y. Jin, K. K. Joo, K. H. Kang, G. Karyan, H. Kichimi, C. H. Kim, D. Y. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, A. Kuzmin, Y.-J. Kwon, K. Lalwani, J. S. Lange, I. S. Lee, S. C. Lee, P. Lewis, C. H. Li, L. K. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, C. MacQueen, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, H. Miyata, R. Mizuk, R. Mussa, M. Nakao, K. J. Nath, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, T. Pang, S. Pardi, H. Park, S.-H. Park, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, L. Santelj, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, J.-G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, Z. S. Stottler, M. Sumihama, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, S. Uno, R. Van Tonder, G. Varner, A. Vinokurova, C. H. Wang, M.-Z. Wang, X. L. Wang, M. Watanabe, E. Won, S. B. Yang, H. Ye, J. Yelton, J. H. Yin, C. Z. Yuan, Z. P. Zhang, V. Zhilich, V. Zhukova, and V. Zhulanov

We present a measurement of the Michel parameters of the $\\tau$ lepton, $\\bar{\\eta}$ and $\\xi\\kappa$, in the radiative leptonic decay $\\tau^- \\rightarrow \\ell^- \\nu_{\\tau} \\bar{\\nu}_{\\ell} \\gamma$ using 711~f$\\mathrm{b}^{-1}$ of collision data collected with the Belle detector at the KEKB $e^+e^-$ collider. The Michel parameters are measured in an unbinned maximum likelihood fit to the kinematic distribution of $e^+e^-\\rightarrow\\tau^+\\tau^-\\rightarrow (\\pi^+\\pi^0 \\bar{\\nu}_\\tau)(\\ell^-\\nu_{\\tau}\\bar{\\nu}_{\\ell}\\gamma)$ $(\\ell=e$ or $\\mu)$. The measured values of the Michel parameters are $\\bar{\\eta} = -1.3 \\pm 1.5 \\pm 0.8$ and $\\xi\\kappa = 0.5 \\pm 0.4 \\pm 0.2$, where the first error is statistical and the second is systematic. This is the first measurement of these parameters. These results are consistent with the Standard Model predictions within their uncertainties and constrain the coupling constants of the generalized weak interaction.

K. Prasanth, J. Libby, I. Adachi, 11 H. Aihara, S. Al Said, 34 D. M. Asner, V. Aulchenko, 58 T. Aushev, R. Ayad, V. Babu, I. Badhrees, 33 S. Bahinipati, A. M. Bakich, V. Bansal, E. Barberio, M. Berger, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bobrov, 58 A. Bondar, 58 G. Bonvicini, A. Bozek, M. Bračko, 29 T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, 48 R. Chistov, 48 K. Cho, S.-K. Choi, Y. Choi, D. Cinabro, N. Dash, S. Di Carlo, Z. Doležal, Z. Drásal, D. Dutta, S. Eidelman, 58 D. Epifanov, 58 H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, 58 A. Garmash, 58 R. Gillard, P. Goldenzweig, D. Greenwald, J. Haba, 11 T. Hara, 11 K. Hayasaka, M. T. Hedges, W.-S. Hou, K. Inami, A. Ishikawa, R. Itoh, 11 Y. Iwasaki, W. W. Jacobs, I. Jaegle, H. B. Jeon, Y. Jin, D. Joffe, K. K. Joo, T. Julius, A. B. Kaliyar, K. H. Kang, G. Karyan, T. Kawasaki, C. Kiesling, D. Y. Kim, J. B. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, P. Kodyš, S. Korpar, 29 D. Kotchetkov, P. Križan, 29 P. Krokovny, 58 T. Kuhr, R. Kulasiri, R. Kumar, T. Kumita, A. Kuzmin, 58 Y.-J. Kwon, J. S. Lange, I. S. Lee, C. H. Li, L. Li, L. Li Gioi, D. Liventsev, 15 M. Lubej, T. Luo, M. Masuda, T. Matsuda, D. Matvienko, 58 K. Miyabayashi, H. Miyata, R. Mizuk, 48, 49 G. B. Mohanty, H. K. Moon, T. Mori, R. Mussa, M. Nakao, 11 T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, 15 M. Niiyama, N. K. Nisar, S. Nishida, 11 S. Ogawa, S. Okuno, H. Ono, 57 P. Pakhlov, 48 G. Pakhlova, 49 B. Pal, C.-S. Park, H. Park, S. Paul, L. Pesántez, R. Pestotnik, L. E. Piilonen, C. Pulvermacher, M. Ritter, A. Rostomyan, Y. Sakai, 11 M. Salehi, 42 S. Sandilya, L. Santelj, T. Sanuki, Y. Sato, O. Schneider, G. Schnell, 17 C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, M. E. Sevior, V. Shebalin, 58 C. P. Shen, T.-A. Shibata, J.-G. Shiu, B. Shwartz, 58 F. Simon, 71 R. Sinha, A. Sokolov, E. Solovieva, 49 M. Starič, J. F. Strube, K. Sumisawa, 11 T. Sumiyoshi, M. Takizawa, 16, 62 U. Tamponi, 79 K. Tanida, F. Tenchini, K. Trabelsi, 11 M. Uchida, S. Uehara, 11 T. Uglov, 49 Y. Unno, S. Uno, 11 P. Urquijo, C. Van Hulse, G. Varner, A. Vinokurova, 58 V. Vorobyev, 58 A. Vossen, E. Waheed, C. H. Wang, M.-Z. Wang, P. Wang, M. Watanabe, Y. Watanabe, E. Widmann, K. M. Williams, E. Won, H. Yamamoto, Y. Yamashita, H. Ye, J. Yelton, Y. Yook, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, 58 V. Zhukova, V. Zhulanov, 58 and A. Zupanc 29

B. Pal, A. J. Schwartz, A. Abdesselam, I. Adachi, 12 H. Aihara, D. M. Asner, T. Aushev, 25 R. Ayad, T. Aziz, V. Babu, I. Badhrees, 30 S. Bahinipati, A. M. Bakich, E. Barberio, P. Behera, V. Bhardwaj, B. Bhuyan, J. Biswal, A. Bobrov, 52 A. Bozek, M. Bračko, 26 T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, R. Chistov, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, J. Dalseno, 66 N. Dash, Z. Doležal, Z. Drásal, A. Drutskoy, 41 D. Dutta, S. Eidelman, 52 H. Farhat, J. E. Fast, B. G. Fulsom, V. Gaur, A. Garmash, 52 R. Gillard, Y. M. Goh, P. Goldenzweig, D. Greenwald, O. Grzymkowska, J. Haba, 12 T. Hara, 12 K. Hayasaka, H. Hayashii, X. H. He, W.-S. Hou, K. Inami, A. Ishikawa, Y. Iwasaki, W. W. Jacobs, I. Jaegle, H. B. Jeon, D. Joffe, K. K. Joo, T. Julius, K. H. Kang, E. Kato, T. Kawasaki, C. Kiesling, D. Y. Kim, H. J. Kim, K. T. Kim, M. J. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, 26 P. Križan, 26 P. Krokovny, 52 T. Kuhr, R. Kumar, T. Kumita, A. Kuzmin, 52 Y.-J. Kwon, I. S. Lee, C. H. Li, H. Li, L. Li, L. Li Gioi, J. Libby, D. Liventsev, 15 P. Lukin, 52 T. Luo, M. Masuda, D. Matvienko, 52 K. Miyabayashi, H. Miyata, R. Mizuk, 41 G. B. Mohanty, S. Mohanty, 75 A. Moll, 66 H. K. Moon, T. Mori, R. Mussa, E. Nakano, M. Nakao, 12 T. Nanut, Z. Natkaniec, M. Nayak, N. K. Nisar, 1 S. Nishida, 12 S. Ogawa, S. Okuno, P. Pakhlov, 41 G. Pakhlova, 25 C. W. Park, H. Park, S. Paul, T. K. Pedlar, L. Pesántez, R. Pestotnik, M. Petrič, L. E. Piilonen, C. Pulvermacher, J. Rauch, E. Ribežl, M. Ritter, A. Rostomyan, S. Ryu, H. Sahoo, Y. Sakai, 12 S. Sandilya, T. Sanuki, Y. Sato, V. Savinov, T. Schlüter, O. Schneider, G. Schnell, 16 C. Schwanda, Y. Seino, K. Senyo, O. Seon, I. S. Seong, V. Shebalin, 52 T.-A. Shibata, J.-G. Shiu, B. Shwartz, 52 F. Simon, 66 Y.-S. Sohn, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, J. Stypula, M. Sumihama, T. Sumiyoshi, U. Tamponi, 74 Y. Teramoto, K. Trabelsi, 12 M. Uchida, S. Uehara, 12 T. Uglov, 42 S. Uno, 12 P. Urquijo, Y. Usov, 52 C. Van Hulse, P. Vanhoefer, G. Varner, A. Vinokurova, 52 A. Vossen, M. N. Wagner, C. H. Wang, M.-Z. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, E. Won, J. Yamaoka, J. Yelton, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, 52 V. Zhulanov, 52 and A. Zupanc 26

Many applications require the generation of gamma spectra at event rates in excess of 10 6 s −1 as well as very good energy resolution, e.g., safeguards, emergency response, and nondestructive assay. Good energy resolution is especially important when lower activity isotopes are sought among a large background (or foreground) that would otherwise dominate the spectrum, such as the minor actinides present in spent fuel after a long cool down time. To this end, we anticipate that high-energy-resolution detectors, such as high-purity germanium, can be adapted to high rates at a small cost to energy resolution, rather than starting with a detector with high-rate capability and medium energy resolution, e.g., LaBr 3 . Here, we present recent design improvements of the ultra high-rate germanium (UHRGe) detection system to allow for a 24-channel spectrum generation output. Further, we present a sensitivity study to determine how uncertainties in parameters of the detection system response affect the resulting spectra. A preamplifier simulator is developed that can emulate the output of the system at various event rates, including very high rates in excess of 10 6 s −1 . Here, we show how various levels of uncertainty in the DC offset of the preamplifier output can affect the full width at half max (FWHM) of the resulting spectrum.

Recent progress on the development of very low noise high purity germanium ionization spectrometers has produced an instrument of 1.2 kg mass and excellent noise performance. The detector was installed in a low-background cryostat intended for use in a direct detection search for low mass, WIMP dark matter. This transaction reports the thermal characterization of the cryostat, specifications of the newly prepared 1.2 kg p-type point contact germanium detector, and the spectroscopic performance of the integrated system. The integrated detector and low background cryostat achieved full-width-at-half-maximum noise performance of 98 eV for an electronic pulse generator peak and 1.9 keV for the 1332-keV Co-60 gamma ray.

Detector sensitivity and purification challenges have limited published 32Si sediment dating studies. The cosmogenic isotope 32Si can fill the sediment geochronology gap between 210Pb (<150 years) and 14C (>1000 years). Targeting this age range can provide geochronological reconstructions of paleoindicators that identify recent human and climate-induced shifts in coastal areas. We are preparing detectors and kilogram-scale sample preparation techniques for such a study of Puget Sound sediments. This work considers the impact of background on counting time and 32Si age-dating reach. Design and performance of new low-background, gas-proportional beta counters to measure 32Si (via 32P) are discussed.

For many nuclear material safeguards inspections, spectroscopic gamma detectors are required which can achieve high event rates (in excess of 10 6 s −1 ) while maintaining very good energy resolution for discrimination of neighboring gamma signatures in complex backgrounds. Such spectra can be useful for non-destructive assay (NDA) of spent nuclear fuel with long cooling times, which contains many potentially useful low-rate gamma lines, e.g., Cs-134, in the presence of a few dominating gamma lines, such as Cs-137. Detectors in use typically sacrifice energy resolution for count rate, e.g., LaBr 3 , or vise-versa, e.g., CdZnTe. In contrast, we anticipate that beginning with a detector with high energy resolution, e.g., high-purity germanium (HPGe), and adapting the data acquisition for high throughput will be able to achieve the goals of the ideal detector. In this work, we present quantification of Cs-134 and Cs-137 activities, useful for fuel burn-up quantification, in fuel that has been cooling for 22.3 years. A segmented, planar HPGe detector is used for this inspection, which has been adapted for a high-rate throughput in excess of 500k counts/s. Using a very-high-statistic spectrum of 2.4 × 10 11 counts, isotope activities can be determined with very low statistical uncertainty. However, it is determined that systematic uncertainties dominate in such a data set, e.g., the uncertainty in the pulse line shape. This spectrum offers a unique opportunity to quantify this uncertainty and subsequently determine required counting times for given precision on values of interest.

The ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\chi}}_{bJ}$ ($J=0,1,2$) processes are studied using a $118\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample acquired with the Belle detector at a center-of-mass energy of 10.867 GeV. Unambiguous ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\chi}}_{bJ}$ ($J=1,2$), $\ensuremath{\omega}{\ensuremath{\chi}}_{b1}$ signals are observed, and indication for $\ensuremath{\omega}{\ensuremath{\chi}}_{b2}$ is seen, both for the first time, and the corresponding cross section measurements are presented. No significant ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\chi}}_{b0}$ or $\ensuremath{\omega}{\ensuremath{\chi}}_{b0}$ signals are observed, and 90% confidence level upper limits on the cross sections for these two processes are obtained. In the ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ invariant mass spectrum, significant non-$\ensuremath{\omega}$ signals are also observed. We search for the $X(3872)$-like state (named ${X}_{b}$) decaying into $\ensuremath{\omega}\mathrm{\ensuremath{\Upsilon}}(1S)$; no significant signal is observed with a mass between 10.55 and $10.65\text{ }\text{ }\mathrm{GeV}/{c}^{2}$.

In gamma spectroscopy, a compromise must be made between energy resolution and event-rate capability. Some foreseen nuclear material safeguards applications require a spectrometer with energy resolution typical of high purity germanium (HPGe) detectors, operated at event rates up to and exceeding 10 6 per second. We report the performance of an HPGe spectrometer system adapted to run under such conditions. Our system consists of a commercial semi-coaxial HPGe detector, a modified high-voltage-rail, resistive-feedback, charge-sensitive preamplifier and a continuous waveform digitizer. Digitized waveforms are analyzed offline with a novel time-variant trapezoidal filter algorithm. Several time-invariant trapezoidal filters are run in parallel and the slowest one not rejected by instantaneous pileup conditions is used to measure each pulse height. We have attained full-width-at-half-maximum energy resolution approximately 8 keV measured at 662 keV with 1.03 ×10 6 per second incoming event rate and 39% throughput. An additional constraint on the width of the fast trigger filter removes a significant amount of rising edge pileup that passes the first pileup cut, reducing throughput to 25%. While better resolution has been reported by other authors, our throughput is an order of magnitude higher than any other reported HPGe system operated at such an event rate.

We search for CP violation in neutral charm meson decays using a data sample with an integrated luminosity of 966 fb(-1) collected with the Belle detector at the KEKB e(+)e(-) asymmetric-energy collider. The asymmetry obtained in the rate of D-0 and (D) over bar (0) decays to the pi(0)pi(0) final state, [-0.03 +/- 0.64(stat) +/- 0.10(syst)]%, is consistent with no CP violation. This constitutes an order of magnitude improvement over the existing result. We also present an updated measurement of the CP asymmetry in the D-0 -> K-S(0)pi(0) decay: A(CP)(D-0 -> K-S(0)pi(0)) = [-0.21 +/- 0.16(stat) +/- 0.07(syst)]%.

A novel, multi-point contact high-purity germanium detector has been developed for applications in high-rate gamma environments. The planar detector was fabricated with seven point contacts, a high-voltage steering grid and bias electrode using amorphous germanium technology. We have characterized this detector and report herein on the depletion profile, leakage current, energy resolution, and charge-sharing behavior.

The gamma-ray spectrum of spent nuclear fuel in the 3-6 MeV energy range is important for active interrogation since gamma rays emitted from nuclear decay are not expected to interfere with measurements in this energy region. There is, unfortunately, a dearth of empirical measurements from spent nuclear fuel in this region. This work is an initial attempt to partially fill this gap by presenting an analysis of gamma-ray spectra collected from a set of spent nuclear fuel sources using a high-purity germanium detector array. This multi-crystal array possesses a large collection volume, providing high energy resolution up to 16 MeV. The results of these measurements establish the continuum count-rate in the energy region between 3 and 6 MeV. Also assessed is the potential for peaks from passive emissions to interfere with peak measurements resulting from active interrogation delayed emissions. As one of the first documented empirical measurements of passive emissions from spent fuel for energies above 3 MeV, this work provides a foundation for active interrogation model validation and detector development.

This report describes the final performance achieved with the detector system developed for the Ultra High Rate Germanium (UHRGe) project. The system performance has been evaluated at low, moderate and high rates and includes the performance of real-time analysis algorithms running in the FPGA of the data acquisition system. This performance is compared to that of offline analyses of streaming waveform data collected with the same data acquisition system the performance of a commercial Multi-Channel Analyzer designed for high-resolution spectroscopy applications, the Canberra LYNX.

This paper presents the design and construction of a portable muon flux monitor based on coincidence counts between two scintillator panels to be used as an indicator for cosmogenic exposure history of detector materials. The Muon Witness detector (mu-Witness) has been designed to count for long periods of time (up to 40 days) using battery power and is mounted in a ruggedized case to enable measurements in transport container environments. The purpose of this apparatus is to accurately account for the cosmic-ray exposure of enriched germanium batches that will become the active detector crystals in neutrinoless double-beta decay experiments. The success of such experiments depends on the ability to mitigate and quantify backgrounds, including accurately estimating the radioactive isotopes induced by cosmogenic activation while the detectors are on the Earth's surface, prior to going underground.

This paper presents progress on the development of a cryostat intended to improve upon the low-energy threshold (below 0.5 keV) of p-type point contact germanium gamma-ray spectrometers. Ultra-low energy thresholds are important in the detection of low-energy nuclear recoils, an event class relevant to both dark matter direct detection and measurement of coherent neutrino-nucleus scattering. The cryostat design, including a thermal and electrical-field model, is given. A prototype cryostat has been assembled and data acquired to evaluate its vacuum and thermal performance.