21+ to 31+ γ width in Na 22 and second class currents 21+ to 31+ γ WIDTH in Na 22 ⋯ S. TRIAMBAK et al.

S. Triambak, L. Phuthu, A. García, G. C. Harper, J. N. Orce, D. A. Short, S. P R Steininger, A. Diaz Varela, R. Dunlop, D. S. Jamieson, W. A. Richter, G. C. Ball, P. E. Garrett, C. E. Svensson, C. Wrede

    Research output: Research - peer-reviewArticle

    Abstract

    Background: A previous measurement of the β-γ directional coefficient in Na22β decay was used to extract recoil-order form factors. The data indicate the requirement of a significant induced-tensor matrix element for the decay. This conclusion largely relies on a standard-model-allowed weak magnetism form factor which was determined using an unpublished value of the analog 21+→31+ γ branch in Na22, with the further assumption that the transition is dominated by its isovector M1 component. Purpose: Our aim is to determine the 21+→31+ width in Na22 in order to obtain an independent measurement of the weak magnetism form factor for the β decay. Methods: A Ne21(p,γ) resonance reaction on an implanted target was used to produce the first 2+ state in Na22 at Ex=1952 keV. Deexcitation γ rays were registered with two 100% relative efficiency high purity germanium detectors. Results: We obtain for the first time an unambiguous determination of the 21+→31+ branch in Na22 to be 0.45(8)%. Conclusions: Using the conserved vector current (CVC) hypothesis, our branch determines the weak magnetism form factor for Na22β decay to be |b/Ac1|=8.7(1.1). Together with the β-γ angular correlation coefficient, we obtain a large induced-tensor form factor for the decay that continues to disagree with theoretical predictions. Two plausible explanations are suggested.

    LanguageEnglish (US)
    Article number035501
    JournalPhysical Review C
    Volume95
    Issue number3
    DOIs
    StatePublished - Mar 15 2017

    Profile

    form factors
    decay
    tensors
    vector currents
    angular correlation
    correlation coefficients
    germanium
    purity
    gamma rays
    analogs
    requirements
    detectors
    coefficients
    matrices
    predictions

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Triambak, S., Phuthu, L., García, A., Harper, G. C., Orce, J. N., Short, D. A., ... Wrede, C. (2017). 21+ to 31+ γ width in Na 22 and second class currents 21+ to 31+ γ WIDTH in Na 22 ⋯ S. TRIAMBAK et al. Physical Review C, 95(3), [035501]. DOI: 10.1103/PhysRevC.95.035501

    21+ to 31+ γ width in Na 22 and second class currents 21+ to 31+ γ WIDTH in Na 22 ⋯ S. TRIAMBAK et al. / Triambak, S.; Phuthu, L.; García, A.; Harper, G. C.; Orce, J. N.; Short, D. A.; Steininger, S. P R; Diaz Varela, A.; Dunlop, R.; Jamieson, D. S.; Richter, W. A.; Ball, G. C.; Garrett, P. E.; Svensson, C. E.; Wrede, C.

    In: Physical Review C, Vol. 95, No. 3, 035501, 15.03.2017.

    Research output: Research - peer-reviewArticle

    Triambak, S, Phuthu, L, García, A, Harper, GC, Orce, JN, Short, DA, Steininger, SPR, Diaz Varela, A, Dunlop, R, Jamieson, DS, Richter, WA, Ball, GC, Garrett, PE, Svensson, CE & Wrede, C 2017, '21+ to 31+ γ width in Na 22 and second class currents 21+ to 31+ γ WIDTH in Na 22 ⋯ S. TRIAMBAK et al.' Physical Review C, vol 95, no. 3, 035501. DOI: 10.1103/PhysRevC.95.035501
    Triambak S, Phuthu L, García A, Harper GC, Orce JN, Short DA et al. 21+ to 31+ γ width in Na 22 and second class currents 21+ to 31+ γ WIDTH in Na 22 ⋯ S. TRIAMBAK et al. Physical Review C. 2017 Mar 15;95(3). 035501. Available from, DOI: 10.1103/PhysRevC.95.035501
    Triambak, S. ; Phuthu, L. ; García, A. ; Harper, G. C. ; Orce, J. N. ; Short, D. A. ; Steininger, S. P R ; Diaz Varela, A. ; Dunlop, R. ; Jamieson, D. S. ; Richter, W. A. ; Ball, G. C. ; Garrett, P. E. ; Svensson, C. E. ; Wrede, C./ 21+ to 31+ γ width in Na 22 and second class currents 21+ to 31+ γ WIDTH in Na 22 ⋯ S. TRIAMBAK et al.In: Physical Review C. 2017 ; Vol. 95, No. 3.
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    AU - García,A.

    AU - Harper,G. C.

    AU - Orce,J. N.

    AU - Short,D. A.

    AU - Steininger,S. P R

    AU - Diaz Varela,A.

    AU - Dunlop,R.

    AU - Jamieson,D. S.

    AU - Richter,W. A.

    AU - Ball,G. C.

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