Beta Spectrum of Radium E

Plassmann, E.A.; Langer, Lawrence M.

doi:10.1103/physrev.96.1593

Cited by 64 publications

(14 citation statements)

References 21 publications

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“…The survival probability is computed by dealing separately P S and P E : these two quantities are calculated for each set of parameters ∆m 2 21 /4E, tan 2 θ 12 , sin 2 θ 13 , according to the indications of the standard solar model [2]. The propagation of neutrinos inside the Earth has been Bi energy spectrum measured using the magnetic spectrometer [79] (crosses, labeled as Langer (1954)) with spectra obtained using different correction factors: those calculated in [80] (red curve labeled as Daniel (1962)) and in [81] (blues curve labeled as Grau (2005)). Also shown are the fit to the Langer data according to Eq.88 with all the three parameters and with b=0.…”

Section: Neutrino Oscillation Analysis With the Borexino Resultsmentioning

confidence: 99%

“…The shape of the 210 Bi β-decay spectrum was measured using a magnetic spectrometer, where the electron energy E has an uncertainty <0.1% and the statistical uncertainty in the relative intensity is <1% for E < 960 keV [79]. Figure 77 shows the comparison between this measurement and the spectra obtained using different correction factors as it results in [80] and [81].…”

Section: The Pep and Cno Neutrino Interaction Ratesmentioning

confidence: 99%

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Final results of Borexino Phase-I on low-energy solar neutrino spectroscopy

Bellini¹,

Benziger²,

Bick³

et al. 2014

Phys. Rev. D

286

345

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Borexino has been running since May 2007 at the LNGS laboratory in Italy with the primary goal of detecting solar neutrinos. The detector, a large, unsegmented liquid scintillator calorimeter characterized by unprecedented low levels of intrinsic radioactivity, is optimized for the study of the lower energy part of the spectrum. During the Phase-I (2007Phase-I ( -2010), Borexino first detected and then precisely measured the flux of the 7 Be solar neutrinos, ruled out any significant day-night asymmetry of their interaction rate, made the first direct observation of the pep neutrinos, and set the tightest upper limit on the flux of CNO solar neutrinos. In this paper we discuss the signal signature and provide a comprehensive description of the backgrounds, quantify their event rates, describe the methods for their identification, selection or subtraction, and describe data analysis. Key features are an extensive in situ calibration program using radioactive sources, the detailed modeling of the detector response, the ability to define an innermost fiducial volume with extremely low background via software cuts, and the excellent pulse-shape discrimination capability of the scintillator that allows particle identification. We report a measurement of the annual modulation of the 7 Be neutrino interaction rate. The period, the amplitude, and the phase of the observed modulation are consistent with the solar origin of these events, and the absence of their annual modulation is rejected with higher than 99% C.L. The physics implications of Phase-I results in the context of the neutrino oscillation physics and solar models are presented.

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Section: Neutrino Oscillation Analysis With the Borexino Resultsmentioning

confidence: 99%

Section: The Pep and Cno Neutrino Interaction Ratesmentioning

confidence: 99%

Final results of Borexino Phase-I on low-energy solar neutrino spectroscopy

Bellini¹,

Benziger²,

Bick³

et al. 2014

Phys. Rev. D

286

345

View full text Add to dashboard Cite

show abstract

“…Especially the first standardizations performed by Cherenkov counting, i.e., the standardization of the radionuclide 210 Bi had not been possible with sufficient accuracy with the shape-factor functions available until then [16][17][18]. The influence of the shape-factor function on the Cherenkov counting efficiency for 210 Bi motivated the development of a shape-factor measuring method based on Cherenkov counting [19].…”

Section: Introductionmentioning

confidence: 99%

Measurement of the shape-factor functions of the long-lived radionuclides 87Rb, 40K and 10Be

Carles

Kossert

2007

Nuclear Instruments and Methods in Physics Research Section A:

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“…Starting from the analysis of Fujita, Ullmann [4] examined the influence of the nuclear size effect on the parameters X and Y. He obtained three sets of X and Y consistent with the spectrum data of Plassmann and Langer [5]. With these three sets he calculated the longitudinal polarization as a function of fl-particle energy.…”

Section: Introductionmentioning

confidence: 97%

A precision measurement of the longitudinal polarization of 83 210 Bi(RaE)?-particles at 900 keV

1977

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The longitudinal polarization of electrons from the fl-decay of 21~ has been measured near the endpoint energy using MMler-scattering. The value PL = (-0.718 + 0.0244) v/c obtained from this experiment has much smaller uncertainty than previous data and allows a moreaccurate redetermination of the nuclear R In addition, an improved determination of the parameters X and Ydefined by Fujita under the assumption of the validity of the CVC theory has been performed. The results are compared with various shell-model predictions.

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Beta Spectrum of Radium E

Cited by 64 publications

References 21 publications

Final results of Borexino Phase-I on low-energy solar neutrino spectroscopy

Final results of Borexino Phase-I on low-energy solar neutrino spectroscopy

Measurement of the shape-factor functions of the long-lived radionuclides 87Rb, 40K and 10Be

A precision measurement of the longitudinal polarization of 83 210 Bi(RaE)?-particles at 900 keV

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