Precision evaluation of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi mathvariant="normal">Ga</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>71</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>(</mml:mo><mml:msub><mml:mi>ν</mml:mi><mml:mi>e</mml:mi></mml:msub><mml:mo>,</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:mrow><mml:mo>)</mml:mo></mml:math>solar neutrino capture rate from the<mml:math xmlns:mml="http://www.w3.org/19

Frekers, D.; Adachi, T.; Akimune, H.; Alanssari, M.; Brown, B. A.; Cleveland, B. T.; Ejiri, H.; Fujita, H.; Fujita, Y.; Fujiwara, M̄.; Гаврин, В. Н.; Harakeh, Mohsen; Hatanaka, K.; Holl, M.; Iwamoto, Chihiro; Lennarz, A.; Okamoto, A.; Okamura, H.; Suzuki, Tomokazu; Tamii, A.

doi:10.1103/physrevc.91.034608

Cited by 30 publications

(22 citation statements)

References 34 publications

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“…In this work updated data [10,23] on neutrino absorption cross section on gallium and the program "speccros" are used to refine the neutrino absorption cross section, which is done for 71 Ga and neutrino sources 51 Cr, 37 Ar and 65 Zn.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, the main results published in [4] where the data [23], [10] have not used, remain true, and the experiment BEST [3] has high potential in testing the hypothesis of electron neutrino oscillations into sterile neutrinos.…”

Section: Discussionmentioning

confidence: 99%

“…Further, for each spectral line of the artificial sources 51 Cr, 37 Ar and 65 Zn presented 1 in Table II, the values of σ g.s. and λ Ex entering (12) are calculated from (2) and data [10,23] by making use of the program "speccros". Subsequently, for each neutrino energy the neutrino capture cross section is obtained including contributions of…”

Section: Fermi Transitionsmentioning

confidence: 99%

“…The main contribution to the uncertainty of the neutrino absorption cross section is associated with corrections from the excited states. To calculate the uncertainty of neutrino cross section, the results of [10,23], as well as the known uncertainty of σ 0 are accounted for. Assuming the measurements of B(GT ) for different energy levels to be independent, we calculate the overall error for each spectral line of the artificial sources as the square root of the sum of the squared standard deviations of all values entering (12).…”

Section: Revision Of the Gallium Anomaly And Searches At Bestmentioning

confidence: 99%

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Revised neutrino-gallium cross section and prospects of BEST in resolving the gallium anomaly

et al. 2018

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Oð1ÞeV sterile neutrino can be responsible for a number of anomalous results of neutrino oscillation experiments. This hypothesis may be tested at short base line neutrino oscillation experiments, several of which are either ongoing or under construction. Here, we concentrate on the so-called gallium anomaly, found by SAGE and GALLEX experiments, and its foreseeable future tests with BEST experiment at Baksan Neutrino Observatory. We start with a revision of the neutrino-gallium cross section that is performed by utilizing the recent measurements of the nuclear final state spectra. We accordingly correct the parameters of gallium anomaly and refine the BEST prospects in testing it and searching for sterile neutrinos. We further evolve the previously proposed idea to investigate the anomaly with 65 Zn artificial neutrino source as a next option available at BEST and estimate its sensitivity to the sterile neutrino model parameters following the Bayesian approach. We show that after the two stages of operation BEST will make 5σ discovery of the sterile neutrinos, if they are behind the gallium anomaly.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Fermi Transitionsmentioning

confidence: 99%

Section: Revision Of the Gallium Anomaly And Searches At Bestmentioning

confidence: 99%

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Revised neutrino-gallium cross section and prospects of BEST in resolving the gallium anomaly

et al. 2018

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“…Experimental and theoretical activities on light ion induced reactions have led to a wealth of accurate spectral information on single charge exchange reactions, from which nuclear matrix elements for single beta decay were obtained, as e.g. in [12][13][14]. For light ion reactions at intermediate energies the close relationship between measured forward angle SCE cross sections and 1ν1β nuclear matrix elements is well established also on theoretical grounds [2].…”

Section: Introductionmentioning

confidence: 98%

Theory of single-charge exchange heavy-ion reactions

et al. 2018

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The theory of heavy ion single charge exchange reactions is reformulated. In momentum space the reaction amplitude factorizes into a product of projectile and target transition form factors, folded with the nucleon-nucleon isovector interaction and a distortion coefficient which accounts for initial and final state ion-ion elastic interactions. The multipole structure of the transition form factors is studied in detail for Fermi-type non-spin flip and Gamow-Teller-type spin flip transitions, also serving to establish the connection to nuclear beta decay. The reaction kernel is evaluated for central and rank-2 tensor interactions. Initial and final state elastic ion-ion interaction are shown to be dominated by the imaginary part of the optical potential allowing to evaluate the reaction coefficients in the strong absorption limit, realized by the black disk approximation. In that limit the distortion coefficient is evaluated in closed form, revealing the relation to the total reaction cross section and the geometry of the transition form factors. It is shown that at small momentum transfer distortion effects reduce to a simple scaling factor, allowing to define reduced forwardangle cross section which is given by nuclear matrix elements of beta decay-type. The response function formalism is used to describe nuclear charge changing transitions. Spectral distributions obtained by a self-consistent HFB and QRPA approach are discussed for τ± excitations of 18 O and 40 Ca, respectively, and compared to spectroscopic data. The interplay of nuclear structure and reaction dynamics is illustrated for the single charge exchange reaction 18 O + 40 Ca → 18 F + 40 K at T lab = 270 MeV.

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Gallium Anomaly: critical view from the global picture of νe and $$ {\overline{\nu}}_e $$ disappearance

Giunti

Ternes

et al. 2022

J. High Energ. Phys.

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The significance of the Gallium Anomaly, from the BEST, GALLEX, and SAGE radioactive source experiments, is quantified using different theoretical calculations of the neutrino detection cross section, and its explanation due to neutrino oscillations is compared with the bounds from the analyses of reactor rate and spectral ratio data, β-decay data, and solar neutrino data. In the 3+1 active-sterile neutrino mixing scheme, the Gallium Anomaly is in strong tension with the individual and combined bounds of these data sets. In the combined scenario with all available data, the parameter goodness of fit is below 0.042%, corresponding to a severe tension of 4–5σ, or stronger. Therefore, we conclude that one should pursue other possible solutions beyond short-baseline oscillations for the Gallium Anomaly. We also present a new global fit of νe and $$ {\overline{\nu}}_e $$ ν ¯ e disappearance data, showing that there is a 2.6–3.3σ preference in favor of short-baseline oscillations, which is driven by an updated analysis of reactor spectral ratio data.

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Precision evaluation of theGa71(νe,e−)solar neutrino capture rate from the
D. Frekers
¹
,
T. Adachi
²
,
H. Akimune
³

et al.

Cited by 30 publications

References 34 publications

Revised neutrino-gallium cross section and prospects of BEST in resolving the gallium anomaly

Revised neutrino-gallium cross section and prospects of BEST in resolving the gallium anomaly

Theory of single-charge exchange heavy-ion reactions

Gallium Anomaly: critical view from the global picture of νe and $$ {\overline{\nu}}_e $$ disappearance

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Precision evaluation of theGa71(νe,e−)solar neutrino capture rate from theD. Frekers1, T. Adachi2, H. Akimune3 et al.

Cited by 30 publications

References 34 publications

Revised neutrino-gallium cross section and prospects of BEST in resolving the gallium anomaly

Revised neutrino-gallium cross section and prospects of BEST in resolving the gallium anomaly

Theory of single-charge exchange heavy-ion reactions

Gallium Anomaly: critical view from the global picture of νe and $$ {\overline{\nu}}_e $$ disappearance

Contact Info

Product

Resources

About

Precision evaluation of theGa71(νe,e−)solar neutrino capture rate from the
D. Frekers
¹
,
T. Adachi
²
,
H. Akimune
³

et al.