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NSR database version of April 26, 2024.

Search: Author = S.Vanlangendonck

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2023SE01      Phys.Rev. C 107, 015502 (2023)

N.Severijns, L.Hayen, V.De Leebeeck, S.Vanlangendonck, K.Bodek, D.Rozpedzik, I.S.Towner

Ft values of the mirror β transitions and the weak-magnetism-induced current in allowed nuclear β decay

RADIOACTIVITY ¹n, ³H(β^-); ¹¹C, ¹³N, ¹⁵O, ¹⁷F, ¹⁹Ne, ²¹Na, ²³Mg, ²⁵Al, ²⁷Si, ²⁹P, ³¹S, ³³Cl, ³⁵Ar, ³⁷K, ³⁹Ca, ⁴¹Sc, ⁴³Ti, ⁴⁵V, ⁴⁷Cr, ⁴⁹Mn, ⁵¹Fe, ⁵³Co, ⁵⁵Ni, ⁵⁷Cu, ⁵⁹Zn, ⁶¹Ga, ⁶³Ge, ⁶⁵As, ⁶⁷Se, ⁶⁹Br, ⁷¹Kr, ⁷³Rb, ⁷⁵Sr, ⁷⁷Y, ⁷⁹Zr, ⁸¹Nb, ⁸³Mo, ⁸⁵Tc, ⁸⁹Rh, ⁹¹Pd, ⁹³Ag, ⁹⁵Cd, ⁹⁷In, ⁹⁹Sn(EC), (β⁺); analyzed and evaluated measured half-lives for decays of all the listed nuclei, and ground-state branching ratios for decays of ¹n to ⁷⁵Sr, T=1/2 mirror β decays; deduced adopted T_1/2, ground-state branching ratios for decays of ¹n to ⁸³Mo, except ⁶⁹Br, ⁷³Rb and ⁸¹Nb. ¹n, ³H(β^-); ¹¹C, ¹³N, ¹⁵O, ¹⁷F, ¹⁹Ne, ²¹Na, ²³Mg, ²⁵Al, ²⁷Si, ²⁹P, ³¹S, ³³Cl, ³⁵Ar, ³⁷K, ³⁹Ca, ⁴¹Sc, ⁴³Ti, ⁴⁵V, ⁴⁷Cr, ⁴⁹Mn, ⁵¹Fe, ⁵³Co, ⁵⁵Ni, ⁵⁷Cu, ⁵⁹Zn, ⁶¹Ga, ⁶⁷Se, ⁷¹Kr, ⁷⁵Sr(EC), (β⁺); calculated quantities and relevant corrections leading to the Ft values for mirror β transitions, and compared with available experimental values; comparison of experimental and theoretical values for the Gamow-Teller matrix element (M_GT) and the orbital current matrix element (M_L) for mirror β transitions from ¹n to ⁴⁵V decays. ⁶He, ⁹Li, ^12,13B, ^14,15C, ¹⁶N, ¹⁹O, ²⁰F, ²³Ne, ^24,24mNa, ²⁸Al, ³²Si(β^-); ^9,10C, ¹²N, ^13,14O, ¹⁸F, ¹⁸Ne, ^20,22Na, ²²Mg, ^24,24mAl, ²⁶Si, ^28,30P, ³⁰S, ³²Cl, ³⁴Ar, ³⁶K, ³⁸Ca, ⁴²Ti, ⁵³Ni(EC), (β⁺); analyzed logft values and other data for β transitions for T=1, 3/2 and 2 multiplet states for radiative corrections; comparison of the experimental values for the M_GT and M_L, and the form factors with the theoretical values calculated using shell model. ¹n, ³H, ⁶He, ^8,9Li, ¹²B, ¹⁶N, ²⁰F, ^23,24Ne, ^24,24mNa(β^-); ⁸Be, ^9,10,11C, ^12,13N, ¹⁵O, ^17,18F, ^18,19Ne, ^20,21Na, ²³Mg, ^24,24m,25Al, ²⁷Si, ^29,30P, ^30,31S, ³³Cl, ³⁵Ar, ^36,37K, ³⁹Ca(EC), (β⁺); analyzed overview of values of experimental form factors for all ground-state to ground-state and ground-state to first-excited 2+ or 4+ state T=1 and 3/2 transitions with A<39, and comparison with theoretical shell model calculations. ⁶He, ⁹Li, ^12,13B, ^14,15C, ¹⁶N, ¹⁹O, ²⁰F, ²³Ne, ^24,24mNa, ²⁸Al, ³²Si(β^-); ^9,10C, ¹²N, ^13,14O, ¹⁸Ne, ¹⁸F, ^20,22Na, ²²Mg, ^24,24mAl, ²⁶Si, ^28,30P, ³⁰S, ³²Cl, ³⁴Ar, ³⁶K, ³⁸Ca, ⁴²Ti, ⁵³Ni(β⁺); analyzed decay schemes for T=1 and T=3/2 mirror β transitions. Update of the Ft values of the isospin T=1/2 mirror β decays determine the V_ud quark-mixing matrix element, taking into account recoil terms, weak magnetism, for the mirror β decays and a large set of β decays in higher isospin multiplets. Relevance to reactor neutrino problem and reactor neutrino anomaly.

NUCLEAR MOMENTS ¹n, ^1,3H, ³He, ^11,13C, ¹¹B, ^13,15N, ^15,17O, ^17,19F, ^19,21Ne, ^21,23Na, ^23,25Mg, ^25,27Al, ^27,29Si, ^29,31P, ^31,33S, ^33,35Cl, ^35,37Ar, ^37,39K, ^39,41Ca, ^41,43Sc, ^43,45Ti, ^45,47V, ^47,49Cr, ^49,51Mn, ^51,53Fe, ^53,55Co, ^55,57Ni, ^57,59Cu, ^59,61Zn, ^61,63Ga, ⁶⁷As, ⁶⁷Se, ⁷¹Br, ⁷¹Kr, ⁷⁵Rb, ^75,77Sr; analyzed and evaluated measured magnetic dipole moments of T=1/2 mirror nuclei; deduced adopted values, and calculated magnetic moments for which no experimental data available; deduced conserved vector current (CVC) form factors, and compared with theoretical shell-model calculations.

doi: 10.1103/PhysRevC.107.015502
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2022VA06      Phys.Rev. C 106, 015506 (2022)

S.Vanlangendonck, N.Severijns, L.Hayen, F.Gluck

Influence of the recoil-order and radiative correction on the β decay correlation coefficients in mirror decays

RADIOACTIVITY ³H(β^-); ¹¹C, ¹³N, ¹⁵O, ¹⁷F, ¹⁹Ne, ²¹Na, ²³Mg, ²⁵Al, ²⁷Si, ²⁹P, ³¹S, ³³Cl, ³⁵Ar, ³⁷K, ³⁹K, ³⁹Ca, ⁴¹Sc, ⁴³Ti, ⁴⁵V(EC), (β⁺); compiled J, π, T_1/2 of parent activities, Gamow-Teller to Fermi mixing ratios, previous, ongoing, and proposed measurements of β correlation coefficients for the mirror beta decays; analyzed dominant standard model correction terms for the recoil-order and the radiative correction in measurements of β-asymmetry parameter and βν(θ); calculated and evaluated recoil-order correction using Holstein formalism with the impulse approximation, semianalytical radiative corrections. Relevance to the planning of future experiments for determination of the β decay correlation coefficients which can provide bounds on the existence of exotic current, and possible existence of right-handed neutrinos.

doi: 10.1103/PhysRevC.106.015506
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2020AR04      Phys.Rev. C 101, 055501 (2020)

V.Araujo-Escalona, D.Atanasov, X.Flechard, P.Alfaurt, P.Ascher, B.Blank, L.Daudin, M.Gerbaux, J.Giovinazzo, S.Grevy, T.Kurtukian-Nieto, E.Lienard, G.Quemener, N.Severijns, S.Vanlangendonck, M.Versteegen, D.Zakoucky

Simultaneous measurements of the β-neutrino angular correlation in ³²Ar pure Fermi and pure Gamow-Teller transitions using β-proton coincidences

RADIOACTIVITY ³²Ar(β⁺), (β⁺p)[from Ca(p, X), E=1.4 GeV]; measured Eβ⁺, Iβ⁺, Ep, Ip, pβ⁺-coin using plastic scintillator for β⁺ detection and silicon detectors for proton detection at ISOLDE-CERN facility; deduced β-neutrino angular correlation coefficients for Fermi and Gamow-Teller transitions. Comparison with theoretical predictions of Standard model. Relevance to constraints on exotic weak interactions, and future WISArD (weak-interaction studies with ³²Ar decay) research at CERN.

doi: 10.1103/PhysRevC.101.055501
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