☆ 4.8 Article

Direct mass measurement of the four-neutron halo nuclide 8He

PHYSICAL REVIEW LETTERS (2008)

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PHYSICAL REVIEW LETTERS

卷 101, 期 1, 页码 -

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AMER PHYSICAL SOC

DOI: 10.1103/PhysRevLett.101.012501

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Physics, Multidisciplinary

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A high-precision Penning trap mass measurement of the exotic (8)He nuclide (T(1/2)=119 ms) has been carried out resulting in a reduction of the uncertainty of the halo binding energy by over an order of magnitude. The new mass, determined with a relative uncertainty of 9.2x10(-8) (delta m=690 eV) is 13 keV less bound than the previously accepted value. The mass measurement is of great relevance for the recent charge-radius measurement of (8)He [P. Mueller , Phys. Rev. Lett. 99, 252501 (2007).]. The (8)He mass is the first result from the newly-commissioned Penning trap: TITAN (TRIUMF's Ion Trap for Atomic and Nuclear science) at the ISAC (Isotope Separator and Accelerator) radioactive beam facility at TRIUMF.

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L. Galli, S. Al Kharusi, T. Brunner, C. Chambers, B. Chana, A. de St Croix, L. Darroch, E. Egan, M. Francesconi, D. Gallacher, P. Giampa, J. Lefebvre, P. Margetak, J. Marti, T. McElroy, M. Patel, B. Rebeiro, F. Retiere, L. Rudolf, G. Signorelli, S. Stracka, M-A Tetrault, S. Viel, L. Xie

Summary: The Light-only Liquid Xenon (LoLX) experiment aims to investigate light emission and transport properties in liquid xenon (LXe) using silicon photomultipliers (SiPMs). Long-term stability studies of SiPMs in LXe are also planned. Another important objective of the LoLX experiment is to develop a background discriminator for low-background LXe experiments, such as neutrino-less double beta decay searches, by characterizing and utilizing the differences in spectrum and timing of Cherenkov and scintillation light production. In this paper, we present the project status and perspectives.

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT (2023)

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Article Physics, Nuclear

Improved high-precision mass measurements of mid-shell neon isotopes

A. Jacobs, C. Andreoiu, J. Bergmann, T. Brunner, T. Dickel, I. Dillmann, E. Dunling, J. Flowerdew, L. Graham, G. Gwinner, Z. Hockenbery, W. J. Huang, B. Kootte, Y. Lan, K. G. Leach, E. Leistenschneider, D. Lunney, E. M. Lykiardopoulou, V. Monier, I. Mukul, S. F. Paul, W. R. Plass, M. P. Reiter, C. Scheidenberger, R. Thompson, J. L. Tracy, C. Will, M. E. Wieser, J. Dilling, A. A. Kwiatkowski

Summary: New mass values for short-lived isotopes 24-26Ne have been measured using the TITAN MR-TOF-MS. These isotopes were produced at TRIUMF's ISAC facility and undergo a least-squares adjustment to improve precision. The improved mass accuracy also leads to refinement in charge radii values, and helps reduce mass uncertainty in laser spectroscopy.

NUCLEAR PHYSICS A (2023)

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Article Physics, Nuclear

Search for two-neutrino double-beta decay of 136Xe to the 0+1excited state of 136Ba with the complete EXO-200 dataset*

S. Al Kharusi, G. Anton, I. Badhrees, P. S. Barbeau, D. Beck, V. Belov, T. Bhatta, M. Breidenbach, T. Brunner, G. F. Cao, W. R. Cen, C. Chambers, B. Cleveland, M. Coon, A. Craycraft, T. Daniels, L. Darroch, S. J. Daugherty, J. Davis, S. Delaquis, A. Der Mesrobian-Kabakian, R. DeVoe, J. Dilling, A. Dolgolenko, M. J. Dolinski, J. Echevers, W. Fairbank, D. Fairbank, J. Farine, S. Feyzbakhsh, P. Fierlinger, Y. S. Fu, D. Fudenberg, P. Gautam, R. Gornea, G. Gratta, C. Hall, E. V. Hansen, J. Hoessl, P. Hufschmidt, M. Hughes, A. Iverson, A. Jamil, C. Jessiman, M. J. Jewell, A. Johnson, A. Karelin, L. J. Kaufman, T. Koffas, R. Kruecken, A. Kuchenkov, K. S. Kumar, Y. Lan, A. Larson, B. G. Lenardo, D. S. Leonard, G. S. Li, S. Li, Z. Li, C. Licciardi, Y. H. Lin, R. MacLellan, T. McElroy, T. Michel, B. Mong, D. C. Moore, K. Murray, O. Njoya, O. Nusair, A. Odian, I. Ostrovskiy, A. Perna, A. Piepke, A. Pocar, F. Retiere, A. L. Robinson, P. C. Rowson, J. Runge, S. Schmidt, D. Sinclair, K. Skarpaas, A. K. Soma, V. Stekhanov, M. Tarka, S. Thibado, J. Todd, T. Tolba, T. I. Totev, R. Tsang, B. Veenstra, V. Veeraraghavan, P. Vogel, J. -l. Vuilleumier, M. Wagenpfeil, J. Watkins, M. Weber, L. J. Wen, U. Wichoski, G. Wrede, S. X. Wu, Q. Xia, D. R. Yahne, L. Yang, Y. -R. Yen, O. Ya. Zeldovich, T. Ziegler

Summary: A new search for two-neutrino double-beta decay has been conducted using the full EXO-200 dataset. By employing a deep learning-based convolutional neural network, the signal detection efficiency has been improved by more than a factor of two compared to previous searches. With the addition of data from an upgraded detector, the sensitivity of the decay to the excited state of Ba-136 has been determined. No statistically significant evidence for the decay has been observed, resulting in an improved lower limit at a 90% confidence level.

CHINESE PHYSICS C (2023)

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Article Instruments & Instrumentation

'Searching for a needle in a haystack;' A Ba-tagging approach for an upgraded nEXO experiment

H. Rasiwala, K. Murray, Y. Lan, C. Chambers, M. Cvitan, T. Brunner, R. Collister, T. Daniels, R. Elmansali, W. Fairbank, R. Gornea, G. Gratta, T. Koffas, A. A. Kwiatkowski, K. G. Leach, A. Lennarz, C. Malbrunot, D. Ray, R. Shaikh, L. Yang

Summary: nEXO is a proposed experiment aiming to search for neutrinoless double-beta decay in 5 tonnes of liquid xenon. This study presents the development of a Ba-tagging technique to detect the decay daughter isotope and enhance sensitivity. The authors discuss a conceptual approach for extraction, trapping, and identification of a single Ba ion from the detector volume, and provide initial results from the commissioning of a quadrupole mass filter.

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS (2023)

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Article Physics, Atomic, Molecular & Chemical

Applications of Machine Learning and Neural Networks for FT-ICR Mass Measurements with SIPT

Scott E. Campbell, Georg Bollen, Alec Hamaker, Walter Kretzer, Ryan Ringle, Stefan Schwarz

Summary: The single-ion Penning trap (SIPT) has been developed for precision mass measurements and a useful approach for simulating Fourier transform ion cyclotron resonance signals is outlined. The application of supervised machine learning algorithms for signal classification and a deep neural network for predicting ion characteristics are discussed.

ATOMS (2023)

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Article Astronomy & Astrophysics

Search for MeV electron recoils from dark matter in EXO-200

S. Al Kharusi, G. Anton, I. Badhrees, P. S. Barbeau, D. Beck, V. Belov, T. Bhatta, M. Breidenbach, T. Brunner, G. F. Cao, W. R. Cen, C. Chambers, B. Cleveland, M. Coon, A. Craycraft, T. Daniels, L. Darroch, S. J. Daugherty, J. Davis, S. Delaquis, A. Der Mesrobian-Kabakian, R. DeVoe, J. Dilling, A. Dolgolenko, M. J. Dolinski, J. Echevers, W. Fairbank, D. Fairbank, J. Farine, S. Feyzbakhsh, P. Fierlinger, Y. S. Fu, D. Fudenberg, P. Gautam, R. Gornea, G. Gratta, C. Hall, E. V. Hansen, J. Hoessl, P. Hufschmidt, M. Hughes, A. Iverson, A. Jamil, C. Jessiman, M. J. Jewell, A. Johnson, A. Karelin, L. J. Kaufman, T. Koffas, R. Krucken, A. Kuchenkov, K. S. Kumar, Y. Lan, D. S. Larson, B. G. Lenardo, D. S. Leonard, G. S. Li, S. Li, Z. Li, C. Licciardi, Y. H. Lin, R. MacLellan, T. McElroy, T. Michel, B. Mong, D. C. Moore, K. Murray, O. Njoya, O. Nusair, A. Odian, I. Ostrovskiy, A. Perna, A. Piepke, A. Pocar, F. Retiere, A. L. Robinson, P. C. Rowson, D. Ruddell, J. Runge, S. Schmidt, D. Sinclair, K. Skarpaas, A. K. Soma, V. Stekhanov, M. Tarka, S. Thibado, M. Todd, T. Tolba, T. I. Totev, R. H. M. Tsang, B. Veenstra, V. Veeraraghavan, P. Vogel, J. -L. Vuilleumier, M. Wagenpfeil, J. Watkins, L. J. Wen, U. Wichoski, G. Wrede, S. X. Wu, Q. Xia, D. R. Yahne, L. Yang, Y. -R. Yen, O. Ya. Zeldovich, T. Ziegler

Summary: A search for electron-recoil signatures from charged-current absorption of fermionic dark matter was conducted using the EXO-200 detector. The study found an average electron-recoil background rate of 6.8 x 104 cts kg-1 yr-1 keV above 4 MeV, with no statistically significant excess over the background projection. With a total exposure of 234.1 kg yr of 136Xe, new parameter space for the charged-current absorption cross section for dark matter masses between 2.6-11.6 MeV was excluded at the 90% confidence level, with a minimum exclusion cross section of 6 x 1051 cm2 at 8.3 MeV.

PHYSICAL REVIEW D (2023)

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Article Physics, Particles & Fields

Performance of novel VUV-sensitive Silicon Photo-Multipliers for nEXO

G. Gallina, Y. Guan, F. Retiere, G. Cao, A. Bolotnikov, I. Kotov, S. Rescia, A. K. Soma, T. Tsang, L. Darroch, T. Brunner, J. Bolster, J. R. Cohen, T. Pinto Franco, W. C. Gillis, H. Peltz Smalley, S. Thibado, A. Pocar, A. Bhat, A. Jamil, D. C. Moore, G. Adhikari, S. Al Kharusi, E. Angelico, I. J. Arnquist, P. Arsenault, I. Badhrees, J. Bane, V. Belov, E. P. Bernard, T. Bhatta, P. A. Breur, J. P. Brodsky, E. Brown, E. Caden, L. Cao, C. Chambers, B. Chana, S. A. Charlebois, D. Chernyak, M. Chiu, B. Cleveland, R. Collister, M. Cvitan, J. Dalmasson, T. Daniels, K. Deslandes, R. DeVoe, M. L. di Vacri, Y. Ding, M. J. Dolinski, A. Dragone, J. Echevers, B. Eckert, M. Elbeltagi, L. Fabris, W. Fairbank, J. Farine, Y. S. Fu, D. Gallacher, P. Gautam, G. Giacomini, C. Gingras, D. Goeldi, R. Gornea, G. Gratta, C. A. Hardy, S. Hedges, M. Heffner, E. Hein, J. Holt, E. W. Hoppe, J. Hoessl, A. House, W. Hunt, A. Iverson, X. S. Jiang, A. Karelin, L. J. Kaufman, R. Kruecken, A. Kuchenkov, K. S. Kumar, A. Larson, K. G. Leach, B. G. Lenardo, D. S. Leonard, G. Lessard, G. Li, S. Li, Z. Li, C. Licciardi, R. Lindsay, R. MacLellan, M. Mahtab, S. Majidi, C. Malbrunot, P. Margetak, P. Martel-Dion, L. Martin, J. Masbou, N. Massacret, K. McMichael, B. Mong, K. Murray, J. Nattress, C. R. Natzke, X. E. Ngwadla, J. C. Nzobadila Ondze, A. Odian, J. L. Orrell, G. S. Ortega, C. T. Overman, S. Parent, A. Perna, A. Piepke, N. Pletskova, J. F. Pratte, V. Radeka, E. Raguzin, G. J. Ramonnye, T. Rao, H. Rasiwala, K. Raymond, B. M. Rebeiro, G. Richardson, J. Ringuette, V. Riot, T. Rossignol, P. C. Rowson, L. Rudolph, R. Saldanha, S. Sangiorgio, X. Shang, F. Spadoni, V. Stekhanov, X. L. Sun, A. Tidball, T. Totev, S. Triambak, R. H. M. Tsang, O. A. Tyuka, F. Vachon, M. Vidal, S. Viel, G. Visser, M. Wagenpfeil, M. Walent, K. Wamba, Q. Wang, W. Wang, Y. Wang, M. Watts, W. Wei, L. J. Wen, U. Wichoski, S. Wilde, M. Worcester, W. H. Wu, X. Wu, L. Xie, W. Yan, H. Yang, L. Yang, O. Zeldovich, J. Zhao, T. Ziegler

Summary: Liquid xenon time projection chambers are promising detectors for neutrinoless double beta decay, and the nEXO collaboration has designed a tonne-scale chamber with a projected half-life sensitivity of 1.35 x 10^28 yr. This paper reports on the characterization of vacuum ultra-violet sensitive SiPMs designed for nEXO, as well as measurements on new test samples of previously characterized MPPCs. The results are used to provide updated estimates of the achievable energy resolution for the nEXO design.

EUROPEAN PHYSICAL JOURNAL C (2022)

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Article Physics, Fluids & Plasmas

Particle-in-cell techniques for the study of space charge effects in an electrostatic ion beam trap

Dhanoj Gupta, Raj Singh, Ryan Ringle, Catherine R. Nicoloff, Igor Rahinov, Oded Heber, Daniel Zajfman

Summary: The simulation technique developed to study space charge interaction in EIBT reveals the significance of space charge in both dispersive and self-bunching regime, affecting trapping efficiency and mass spectrometer performance. The numerical results reproduce experimental data and emphasize the critical importance of considering space charge effects in ion trap dynamics even at low ion density.

PHYSICAL REVIEW E (2021)

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