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Investigation of the Δn = 0 selection rule in Gamow-Teller transitions: The β-decay of 207Hg

Berry, T.A., Podolyak, Zs., Carroll, R.J., Lică, R., Grawe, H., Timofeyuk, N.K., Alexander, T., Andreyev, A.N., Ansari, S., Borge, M.J.G. , Creswell, J., Fahlander, C., Fraile, L.M., Fynbo, H.O.U., Gelletly, W., Gerst, R.-B., Górska, M., Gredley, A., Greenlees, P., Harkness-Brennan, L.J., Huyse, M., Judge, S.M., Judson, D.S., Konki, J., Kurcewicz, J., Kuti, I., Lalkovski, S., Lazarus, I., Lund, M., Madurga, M., Mărginean, N., Mărginean, R., Marroquin, I., Mihai, C., Mihai, R.E., Nácher, E., Nae, S., Negret, A., Niţă, C., Page, R.D., Pascu, S., Patel, Z., Perea, A., Pucknell, V., Rahkila, P., Rapisarda, E., Regan, P.H., Rotaru, F., Shand, C.M., Simpson, E.C., Sotty, Ch., Stegemann, S., Stora, T., Tengblad, O., Turturica, A., Van Duppen, P., Vedia, V., Wadsworth, R., Walker, P.M., Warr, N., Wearing, F. and De Witte, H. (2019) Investigation of the Δn = 0 selection rule in Gamow-Teller transitions: The β-decay of 207Hg Physics Letters B, 793. pp. 271-275.

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Gamow-Teller β decay is forbidden if the number of nodes in the radial wave functions of the initial and final states is different. This Δn=0 requirement plays a major role in the β decay of heavy neutron-rich nuclei, affecting the nucleosynthesis through the increased half-lives of nuclei on the astrophysical r-process pathway below both Z=50 (for N ˃ 82) and Z = 82 (for N ˃ 126). The level of forbiddenness of the Δn=1v1g9/2 → π0g7/2 transition has been investigated from the β decay of the ground state of 207Hg into the single-proton-hole nucleus 207Tl in an experiment at the ISOLDE Decay Station. From statistical observational limits on possible γ-ray transitions depopulating the π0g-17/2 state in 207Tl, an upper limit of 3.9 x 10-3% was obtained for the probability of this decay, corresponding to log ft ˃ 8.8 within a 95% confidence limit. This is the most stringent test of the Δn=0 selection rule to date.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Carroll, R.J.
Lică, R.
Grawe, H.
Alexander, T.
Andreyev, A.N.
Ansari, S.
Borge, M.J.G.
Creswell, J.
Fahlander, C.
Fraile, L.M.
Fynbo, H.O.U.
Gerst, R.-B.
Górska, M.
Gredley, A.
Greenlees, P.
Harkness-Brennan, L.J.
Huyse, M.
Judge, S.M.
Judson, D.S.
Konki, J.
Kurcewicz, J.
Kuti, I.
Lalkovski, S.
Lazarus, I.
Lund, M.
Madurga, M.
Mărginean, N.
Mărginean, R.
Marroquin, I.
Mihai, C.
Mihai, R.E.
Nácher, E.
Nae, S.
Negret, A.
Niţă, C.
Page, R.D.
Pascu, S.
Patel, Z.
Perea, A.
Pucknell, V.
Rahkila, P.
Rapisarda, E.
Rotaru, F.
Simpson, E.C.
Sotty, Ch.
Stegemann, S.
Stora, T.
Tengblad, O.
Turturica, A.
Van Duppen, P.
Vedia, V.
Wadsworth, R.
Warr, N.
Wearing, F.
De Witte, H.
Date : 10 June 2019
Funders : European Union Seventh Framework Programme, Science and Technology Facilities Council (STFC)
DOI : 10.1016/j.physletb.2019.04.039
Grant Title : ENSAR
Copyright Disclaimer : © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( Funded by SCOAP3.
Depositing User : Clive Harris
Date Deposited : 10 May 2019 08:52
Last Modified : 10 May 2019 08:52

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