The mass of the electron neutrino from electron capture in 163Ho

Yasumi, S.; Maezawa, H.; Shima, Kunihiro; Inagaki, Y.; Mukoyama, Takeshi; Mizogawa, Tatsumi; Sera, K.; Kishimoto, Shunji; Fujioka, M.; Ishii, K.; Omori, Takashi; Izawa, G.; Kawakami, Osamu

doi:10.1016/0370-2693(94)90616-5

Cited by 25 publications

(23 citation statements)

References 14 publications

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“…Studying X-rays emitted after the EC decay allows one to determine the ratios of capture rates from the M and N shells as well as the absolute M capture rates, from which the neutrino mass can be reconstructed. Applying this method, Yasumi et al obtained an upper limit on the electron neutrino mass of m(ν e ) < 490 eV at 68% CL [48]. On the other hand, Springer et al made use of the inner Bremsstrahlung method to obtain an upper limit of m(ν e ) < 225 eV at 95% CL [47].…”

Section: Electron Capture On 163 Homentioning

confidence: 99%

Current Direct Neutrino Mass Experiments

Drexlin

Hannen

Mertens

et al. 2013

Advances in High Energy Physics

286

304

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In this contribution we review the status and perspectives of direct neutrino mass experiments. These experiments investigate the kinematics of β-decays of specific isotopes ( 3 H, 187 Re, 163 Ho) to derive model-independent information on the averaged electron (anti-) neutrino mass, which is formed by the incoherent sum of the neutrino mass eigenstates contributing to the electron neutrino. We first review the kinematics of β-decay and the determination of the neutrino mass, before giving a brief overview of past neutrino mass measurements (SN1987a-ToF studies, Mainz and Troitsk experiments for 3 H, cryo-bolometers for 187 Re). We then describe the Karlsruhe Tritium Neutrino (KATRIN) experiment which is currently under construction at Karlsruhe Institute of Technology. The large-scale setup will use the MAC-E-Filter principle pioneered earlier to push the sensitivity down to a value of 200 meV (90% C.L.). KATRIN faces many technological challenges that have to be resolved with regard to source intensity and stability, as well as precision energy analysis and low background rate close to the kinematic endpoint of tritium β-decay at 18.6 keV. We then review new experimental approaches such as the MARE, ECHO and Project8 experiments, which offer the promise to perform an independent measurement of the neutrino mass in the sub-eV region. This variety of methods and the novel technologies developed in all present and future experiments demonstrate the great potential of direct neutrino mass experiments in providing vital information on the absolute mass scale of neutrinos.

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Section: Electron Capture On 163 Homentioning

confidence: 99%

Current Direct Neutrino Mass Experiments

Drexlin

Hannen

Mertens

et al. 2013

Advances in High Energy Physics

286

304

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“…The tails of the lines extend to the energy limit imposed by the groundstate Q-value, and at that limit are sensitive to the modification of phase space caused by neutrino mass, just as in beta decay. The existence of an electroncapture isotope, 163 Ho, with a very low Q-value [12] in the vicinity of 2.5 keV heightened the interest in this approach and a number of experimental groups explored the possibility with a variety of techniques [13][14][15][16][17][18].…”

Section: Electron-capture Decaymentioning

confidence: 99%

Examination of the calorimetric spectrum to determine the neutrino mass in low-energy electron capture decay

Robertson

2015

Phys. Rev. C

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Background: The standard kinematic method for determining neutrino mass from the beta decay of tritium or other isotope is to measure the shape of the electron spectrum near the endpoint. A similar distortion of the "visible energy" remaining after electron capture is caused by neutrino mass. There has been a resurgence of interest in using this method with 163 Ho, driven by technological advances in microcalorimetry. Recent theoretical analyses offer reassurance that there are no significant theoretical uncertainties.Purpose: The theoretical analyses consider only single vacancy states in the daughter 163 Dy atom. It is necessary to consider configurations with more than one vacancy that can be populated owing to the change in nuclear charge. Method:The shakeup and shakeoff theory of Carlson and Nestor is used as a basis for estimating the population of double-vacancy states.Results: A spectrum of satellites associated with each primary vacancy created by electron capture is presented. Conclusions:The theory of the calorimetric spectrum is more complicated than has been described heretofore. There are numerous shakeup and shakeoff satellites present across the spectrum, and some may be very near the endpoint. The spectrum shape is presently not well enough understood to permit a sensitive determination of the neutrino mass in this way.

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“…In the early phase the first approach was used by several groups [20,25,26] and led eventually to an upper limit for the electron neutrino mass of m νe < 490 eV/c 2 (68% C.L.) [27] obtained by analyzing the M-lines and N-lines of the 163 Ho X-ray spectrum. The second method, the analysis of the inner Bremsstrahlung photons, led to an even more stringent limit of m νe < 225 eV/c 2 (95% C.L.)…”

Section: Introductionmentioning

confidence: 99%

“…In equation (27) such overlaps occur three times, namely as the second term within the parentheses and twice in the fraction (both in the nominator implicitly in B ovl j and in the denominator). Since the term within the parentheses is subtracted from unity, it is evidently not a good idea to use the Vatai approximation for it.…”

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confidence: 99%

The electron capture in 163Ho experiment – ECHo

Gastaldo

Blaum

Chrysalidis

et al. 2017

Eur. Phys. J. Spec. Top.

132

110

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Abstract. Neutrinos, and in particular their tiny but non-vanishing masses, can be considered one of the doors towards physics beyond the Standard Model. Precision measurements of the kinematics of weak interactions, in particular of the 3 H β-decay and the 163 Ho electron capture (EC), represent the only model independent approach to determine the absolute scale of neutrino masses. The electron capture in 163 Ho experiment, ECHo, is designed to reach sub-eV sensitivity on the electron neutrino mass by means of the analysis of the calorimetrically measured electron capture spectrum of the nuclide 163 Ho. The maximum energy available for this decay, about 2.8 keV, constrains the type of detectors that can be used. Arrays of low temperature metallic magnetic calorimeters (MMCs) are being developed to measure the 163 Ho EC spectrum with energy resolution below 3 eV FWHM and with a time resolution below 1 μs. To achieve the sub-eV sensitivity on the electron neutrino mass, together with the detector optimization, the availability of large ultra-pure 163 Ho samples, the identification and suppression of background sources as well as the precise parametrization of the 163 Ho EC spectrum are of utmost importance. The high-energy resolution 163 Ho spectra measured with the first MMC prototypes with ion-implanted 163 Ho set the basis for the ECHo experiment. We describe the conceptual design of ECHo and motivate the strategies we have adopted to carry on the present medium scale experiment, ECHo-1K. In this experiment, the use of 1 kBq 163 Ho will allow to reach a neutrino mass sensitivity below 10 eV/c 2 . We then discuss how the results being achieved in ECHo-1k will guide the design of the next stage of the ECHo experiment, ECHo-1M, where a source of the order of 1 MBq 163 Ho embedded in large MMCs arrays will allow to reach sub-eV sensitivity on the electron neutrino mass.

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The mass of the electron neutrino from electron capture in 163Ho

Cited by 25 publications

References 14 publications

Current Direct Neutrino Mass Experiments

Current Direct Neutrino Mass Experiments

Examination of the calorimetric spectrum to determine the neutrino mass in low-energy electron capture decay

The electron capture in 163Ho experiment – ECHo

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