R. Hazama
University of Washington
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Publication
Featured researches published by R. Hazama.
Physical Review Letters | 2000
H. Ejiri; J. Engel; R. Hazama; P. Krastev; N. Kudomi; R. G. H. Robertson
Spectroscopic studies of two beta rays from 100Mo are shown to be of potential interest for investigating both the Majorana nu mass by neutrinoless double beta decay (0nubetabeta) and low energy solar nus by inverse beta decay. With a multiton 100Mo detector, coincidence studies of correlated betabeta from 0nubetabeta, together with the large Q value ( Q(betabeta)), permit identification of the nu-mass term with a sensitivity of approximately 0.03 eV. Correlation studies of the inverse beta decay and the successive beta decay of 100Tc, together with the large capture rates for low energy solar nus, make it possible to detect, in real time, individual low energy solar nu in the same detector.
Modern Physics Letters A | 2002
Frank T. Avignone; A. S. Barabash; F. Boehm; R. L. Brodzinski; J. I. Collar; P. J. Doe; H. Ejiri; Stephen R. Elliott; E. Fiorini; R.J. Gaitskell; G. Gratta; R. Hazama; K. Kazkaz; G. S. King; Richard T. Kouzes; Harry S. Miley; M. Moe; A. Morales; J. Morales; A. Piepke; R. G. H. Robertson; W. Tornow; P. G. Vogel; Ray A. Warner; J. F. Wilkerson
We comment on the recent claim for the experimental observation of neutrinoless double-beta decay. We discuss several limitations in the analysis provided in that paper and conclude that there is no basis for the presented claim.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2007
J.F. Amsbaugh; Juan-Manuel Anaya; J. Banar; T. J. Bowles; M.C. Browne; T.V. Bullard; T.H. Burritt; G.A. Cox-Mobrand; X. Dai; H. Deng; M. Di Marco; P. J. Doe; M.R. Dragowsky; C.A. Duba; F.A. Duncan; E.D. Earle; S. R. Elliott; Ernst I. Esch; H. Fergani; J. Formaggio; M. M. Fowler; J.E. Franklin; P. Geissbühler; J.V. Germani; A. Goldschmidt; E. Guillian; A. L. Hallin; G. Harper; P.J. Harvey; R. Hazama
An array of Neutral-Current Detectors (NCDs) has been built in order to make a unique measurement of the total active ux of solar neutrinos in the Sudbury Neutrino Observatory (SNO). Data in the third phase of the SNO experiment were collected between November 2004 and November 2006, after the NCD array was added to improve the neutral-current sensitivity of the SNO detector. This array consisted of 36 strings of proportional counters lled with a mixture of 3He and CF4 gas capable of detecting the neutrons liberated by the neutrino-deuteron neutral current reaction in the D2O, and four strings lled with a mixture of 4He and CF4 gas for background measurements. The proportional counter diameter is 5 cm. The total deployed array length was 398 m. The SNO NCD array is the lowest-radioactivity large array of proportional counters ever produced. This article describes the design, construction, deployment, and characterization of the NCD array, discusses the electronics and data acquisition system, and considers event signatures and backgrounds.
