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NSR database version of April 11, 2024.

Search: Author = J.I.Collar

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2023CO07      Phys.Rev. C 108, L021602 (2023)

J.I.Collar, S.G.Yoon

New measurements of 71Ge decay: Impact on the gallium anomaly

RADIOACTIVITY 71Ge(EC)[from 70Ge(n, X), E=thermal]; measured Eγ, Iγ, X-rays; deduced T1/2, relative EC rates from different atomic shells PL/PK. Constrain explanation for the so-called "gallium anomaly" based on the71Ge decay. Small (1 cm3) n-type germanium diode activated with thermal neutron from moderated 252Cf source and used as a detector of 71Ge decay.

doi: 10.1103/PhysRevC.108.L021602
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2022CO12      Phys.Rev.Lett. 129, 211802 (2022)

J.Colaresi, J.I.Collar, T.W.Hossbach, C.M.Lewis, K.M.Yocum

Measurement of Coherent Elastic Neutrino-Nucleus Scattering from Reactor Antineutrinos

NUCLEAR REACTIONS Ge(ν, ν), E ∼ 2 MeV; measured reaction products; deduced very strong preference for the presence of a coherent elastic neutrino-nucleus scattering. p-type point contact (PPC) germanium detector in close proximity to the core of the Dresden-II boiling water reactor (BWR).

doi: 10.1103/PhysRevLett.129.211802
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2021CO12      Phys.Rev. D 104, 072003 (2021)

J.Colaresi, J.I.Collar, T.W.Hossbach, A.R.L.Kavner, C.M.Lewis, A.E.Robinson, K.M.Yocum

First results from a search for coherent elastic neutrino-nucleus scattering at a reactor site

doi: 10.1103/PhysRevD.104.072003
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2021LE12      Phys.Rev. C 104, 014612 (2021)

C.M.Lewis, J.I.Collar

Response of undoped cryogenic CsI to low-energy nuclear recoils

NUCLEAR REACTIONS Cs, I(n, n), E=2.25 MeV monochromatic neutrons from a 2H-2H generator; measured scattered neutrons from a CsI crystal by a Bicron 501A liquid scintillator cell, with CsI scintillator coupled to a cryogenic photomultiplier (PMT) at 108-165K, and light (photon) yields for electron recoils (ERs) and nuclear recoils (NRs); deduced quenching factor for low-energy nuclear recoils in undoped cryogenic CsI crystal. Relevance to detection of weakly interacting massive particles (WIMPs), and coherent elastic neutrino-nucleus scattering (CEνNS) events.

doi: 10.1103/PhysRevC.104.014612
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2019AK14      Phys.Rev. D 100, 115020 (2019)

D.Akimov, J.B.Albert, P.An, C.Awe, P.S.Barbeau, B.Becker, V.Belov, M.A.Blackston, A.Bolozdynya, B.Cabrera-Palmer, M.Cervantes, J.I.Collar, R.L.Cooper, J.Daughhetee, M.del Valle Coello, J.A.Detwiler, M.D'Onofrio, Y.Efremenko, E.M.Erkela, S.R.Elliott, L.Fabris, M.Febbraro, W.Fox, A.Galindo-Uribarri, M.P.Green, K.S.Hansen, M.R.Heath, S.Hedges, T.Johnson, M.Kaemingk, L.J.Kaufman, A.Khromov, A.Konovalov, E.Kozlova, A.Kumpan, L.Li, J.T.Librande, J.M.Link, J.Liu, K.Mann, D.M.Markoff, H.Moreno, P.E.Mueller, J.Newby, D.S.Parno, S.Penttila, D.Pershey, D.Radford, R.Rapp, H.Ray, J.Raybern, O.Razuvaeva, D.Reyna, G.C.Rich, D.Rudik, J.Runge, D.J.Salvat, K.Scholberg, A.Shakirov, G.Simakov, G.Sinev, W.M.Snow, V.Sosnovtsev, B.Suh, R.Tayloe, K.Tellez-Giron-Flores, R.T.Thornton, I.Tolstukhin, J.Vanderwerp, R.L.Varner, C.J.Virtue, G.Visser, C.Wiseman, T.Wongjirad, J.Yang, Y.-R.Yen, J.Yoo, C.-H.Yu, J.Zettlemoyer

First constraint on coherent elastic neutrino-nucleus scattering in argon

NUCLEAR REACTIONS Ar, 133Cs, 127I, Ge, 23Na(ν, ν), E, 100 MeV; measured reaction products, nuclear recoils; deduced a limit on coherent elastic neutrino-nucleus scattering.

doi: 10.1103/PhysRevD.100.115020
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2018AW01      Phys.Rev. C 98, 045802 (2018)

C.Awe, P.S.Barbeau, J.I.Collar, S.Hedges, L.Li

Liquid scintillator response to proton recoils in the 10-100 keV range

NUCLEAR REACTIONS 1H(n, n'), (n, p), E=244.6 keV; measured proton recoil spectra, time of flight for scattered neutrons, np-coin, low-energy quenching factors (QF) for proton recoils in liquid organic scintillators. Comparison with simulated and previous experimental data. Discussed relevance to searches for low-mass particle dark matter.

doi: 10.1103/PhysRevC.98.045802
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2013CO13      Phys.Rev.Lett. 110, 211101 (2013)


Applications of an 88Y=Be Photoneutron Calibration Source to Dark Matter and Neutrino Experiments

doi: 10.1103/PhysRevLett.110.211101
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2013CO17      Phys.Rev. C 88, 035806 (2013)


Quenching and channeling of nuclear recoils in NaI(Tl): Implications for dark-matter searches

doi: 10.1103/PhysRevC.88.035806
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1999AA01      Nucl.Phys. B(Proc.Supp.) S70, 236 (1999)

C.E.Aalseth, F.T.Avignone III, R.L.Brodzinski, J.I.Collar, D.Gonzales, E.Garcia, F.Hasenbalg, W.K.Hensley, I.V.Kirpichnikov, A.A.Klimenko, H.S.Miley, A.Morales, J.Morales, A.Oritz de Solorzano, S.B.Osetrov, V.S.Pogosov, J.Puimedon, J.H.Reeves, A.Salinas, M.L.Sarsa, A.A.Smolnikov, A.S.Starostin, A.G.Tamanyan, A.V.Vasenko, S.I.Vasilev, J.A.Villar

The Status of the IGEX 76Ge Double-Beta Decay Experiment in 1997

RADIOACTIVITY 76Ge(2β-); measured 0ν accompanied 2β decay T1/2 lower limit.

doi: 10.1016/S0920-5632(98)00426-5
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1999AA02      Phys.Rev. C59, 2108 (1999)

C.E.Aalseth, F.T.Avignone III, R.L.Brodzinski, J.I.Collar, E.Garcia, D.Gonzalez, F.Hasenbalg, W.K.Hensley, I.V.Kirpichnikov, A.A.Klimenko, H.S.Miley, A.Morales, J.Morales, A.Ortiz de Solorzano, S.B.Osetrov, V.S.Pogosov, J.Puimedon, J.H.Reeves, A.Salinas, M.L.Sarsa, A.A.Smolnikov, A.S.Starostin, A.G.Tamanyan, A.A.Vasenko, S.I.Vasilev, J.A.Villar, and the IGEX Collaboration

Neutrinoless Double-β Decay of 76Ge: First results from the International Germanium Experiment (IGEX) with six Isotopically enriched detectors

RADIOACTIVITY 76Ge(2β); measured 0ν accompanied 2β-decay T1/2 lower limit; deduced neutrino mass parameter upper bound.

doi: 10.1103/PhysRevC.59.2108
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1999AR13      Phys.Lett. 458B, 167 (1999)

H.Arnould, C.A.Bompas, R.Del Moral, V.Lacoste, V.Vlachoudis, J.Aleixandre, J.Bueno, E.Cerro, O.Gonzalez, J.Tamarit, S.Andriamonje, D.Brozzi, S.Buono, F.Carminati, F.Casagrande, P.Cennini, J.I.Collar, L.Dumps, C.Geles, I.Goulas, R.Fernandez, Y.Kadi, R.Klapisch, J.Oropesa, A.Placci, J.-P.Revol, C.Rubbia, J.A.Rubio, F.Saldana, M.Embid, J.Galvez, C.Lopez, E.Perez-Enciso, M.Poza, C.Sirvent, S.Vieira, A.Abanades, J.Garcia, J.M.Martinez-Val, M.Perlado, E.Gonzalez, M.Hussonnois, C.Le Naour, D.Trubert, E.Belle, A.Giorni, D.Heuer, J.M.Loiseaux, O.Meplan, H.Nifenecker, F.Schussler, J.B.Viano, A.Angelopoulos, A.Apostolakis, P.Karaiskos, L.Sakelliou, P.Kokkas, P.Pavlopoulos, C.Eleftheriadis, G.Kitis, I.Papadopoulos, E.Savvidis, A.Tzima, K.Zioutas, S.Diez, A.Perez-Navarro

Experimental Verification of Neutron Phenomenology in Lead and Transmutation by Adiabatic Resonance Crossing in Accelerator Driven Systems

NUCLEAR REACTIONS Pb(p, nX), E at 2.5, 3.6 GeV/c; measured neutron spectra, fluence. 99Tc, 127,129I(n, γ), E=spectrum; measured capture rates. Adiabatic resonance crossing, accelerator-based waste transmutation.

doi: 10.1016/S0370-2693(99)00584-5
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1998CR03      Phys.Lett. 427B, 235 (1998)

R.J.Creswick, F.T.Avignone III, H.A.Farach, J.I.Collar, A.O.Gattone, S.Nussinov, K.Zioutas

Theory for the Direct Detection of Solar Axions by Coherent Primakoff Conversion in Germanium Detectors

doi: 10.1016/S0370-2693(98)00183-X
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1996AA02      Nucl.Phys.(Proc.Suppl.) S48, 223 (1996)

C.E.Aalseth, F.T.Avignone III, R.L.Brodzinski, J.I.Collar, E.Garcia, D.Gonzales, F.Hasenbalg, W.K.Hensley, I.V.Kirpichnikov, A.A.Klimenko, H.S.Miley, A.Morales, J.Morales, A.Ortiz de Solorzano, S.B.Osetrov, V.S.Pogosov, J.Puimedon, J.H.Reeves, C.Saenz, A.Salinas, M.L.Sarsa, A.A.Smolnikov, A.S.Starostin, A.G.Tamanyan, A.A.Vasenko, S.I.Vasilev, J.A.Villar

Recent Results from the IGEX Double-Beta Decay Experiment

RADIOACTIVITY 76Ge(2β); measured 2ν-, 0ν-accompanied 2β-decay T1/2. Six detector International Germanium Experiment.

doi: 10.1016/0920-5632(96)00244-7
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1996JE06      Nucl.Instrum.Methods Phys.Res. A373, 65 (1996)

V.Jeudy, J.I.Collar, T.A.Girard, D.Limagne, G.Waysand

35S Beta Irradiation of a Tin Strip in a State of Superconducting Geometrical Metastability

RADIOACTIVITY 35S(β-); measured spectra; deduced thermal nucleation breaking geometric metastability. Irradiation of Sn strip in a state of superconducting geometrical metastability.

doi: 10.1016/0168-9002(95)01451-9
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1995AH07      Phys.Lett. 353B, 168 (1995)

Y.Aharonov, F.T.Avignone III, R.L.Brodzinski, J.I.Collar, E.Garcia, H.S.Miley, A.Morales, J.Morales, S.Nussinov, A.Oritz de Solorzano, J.Puimedon, J.H.Reeves, C.Saenz, A.Salinas, M.L.Sarsa, J.A.Villar

New Experimental Limits for the Electron Stability

doi: 10.1016/0370-2693(95)00514-L
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1995BA29      Phys.Lett. 345B, 408 (1995)

A.S.Barabash, F.T.Avignone III, J.I.Collar, C.K.Guerard, R.J.Arthur, R.L.Brodzinski, H.S.Miley, J.H.Reeves, J.R.Meier, K.Ruddick, V.I.Umatov

Two Neutrino Double-Beta Decay of 100Mo to the First Excited 0+ State in 100Ru

RADIOACTIVITY 100Mo(2β); measured 2ν-accompanied 2β-decay γ-spectra; deduced T1/2 at 68% confidence level. Very thick, enriched molybdenum powder sample.

doi: 10.1016/0370-2693(94)01657-X
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1993BR22      Nucl.Phys. B(Proc.Supp.) S31, 76 (1993)

R.L.Brodzinski, F.T.Avignone, J.I.Collar, H.Courant, E.Garcia, C.K.Guerard, W.K.Hensley, I.V.Kirpichnikov, H.S.Miley, A.Morales, J.Morales, R.Nunez-Lagos, S.B.Osetrov, V.S.Pogosov, A.A.Pomansky, J.Puimedon, J.H.Reeves, K.Ruddick, C.Saenz, A.Salinas, M.L.Sarsa, A.A.Smolnikov, A.S.Starostin, A.G.Tamanyan, S.I.Vasilev, J.A.Villar

Status Report on the International Germanium Experiment

RADIOACTIVITY 76Ge(2β); measured 2ν-accompanied 2β-decay spectrum. Enriched detector in Homestake mine.

doi: 10.1016/0920-5632(93)90116-N
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1993GI08      Nucl.Instrum.Methods Phys.Res. A334, 645 (1993)

T.A.Girard, R.P.Henriques, J.I.Collar, M.Godinho, G.Bonfait, G.Waysand, D.Limagne, V.Jeudy, V.Pagesy

Response of a Metastable Superconducting Grains Suspension to Irradiation by 35S Decay Electrons

RADIOACTIVITY 35S(β-); measured electron energy loss spectrum. Prototype detector composed of a suspension.

doi: 10.1016/0168-9002(93)90834-5
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1991AV04      J.Phys.(London) G17, S181 (1991)

F.T.Avignone III, R.L.Brodzinski, J.I.Collar, C.K.Guerard, H.S.Miley, J.H.Reeves

Measurements of the Half-Life of the 2ν ββ-Decay of 76Ge

RADIOACTIVITY 76Ge(2β); measured 2ν-accompanied two β-decay T1/2. Two different detectors.

doi: 10.1088/0954-3899/17/S/019
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1990MI23      Phys.Rev.Lett. 65, 3092 (1990)

H.S.Miley, F.T.Avignone III, R.L.Brodzinski, J.I.Collar, J.H.Reeves

Suggestive Evidence for the Two-Neutrino Double-β Decay of 76Ge

RADIOACTIVITY 76Ge(2β); measured spectra; deduced two-neutrino 2β-decay T1/2. Natural isotopic abundance detectors.

doi: 10.1103/PhysRevLett.65.3092
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