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Report No.

Investigation of the $$Delta$$$$n$$ = 0 selection rule in Gamow-Teller transitions; The $$beta$$-decay of $$^{207}$$Hg

Berry, T. A.*; Podoly$'a$k, Zs.*; Carroll, R. J.*; Lic$u{a}$, 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.*; G$'o$rska, 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.*; M$u{a}$rginean, N.*; M$u{a}$rginean, R.*; Marroquin, I.*; Mihai, C.*; Mihai, R. E.*; N$'a$cher, E.*; Nae, S.*; Negret, A.*; Nita, 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.*; Weaving, F.*; De Witte, H.*

Gamow-Teller $$beta$$ decay is forbidden if the number of nodes in the radial wave functions of the initial and final states is different. This $$Delta$$$$n$$ = 0 requirement plays a major role in the $$beta$$ 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 $$Delta$$$$n$$ = 1 $$nu$$1$$g_{9/2} rightarrow pi$$0$$g_{7/2}$$ transition has been investigated from the $$beta^{-}$$ decay of the ground state of $$^{207}$$Hg into the single-proton-hole nucleus $$^{207}$$Tl in an experiment at the ISOLDE Decay Station. From statistical observational limits on possible $$gamma$$-ray transitions depopulating the $$pi$$0$$g^{-1}_{7/2}$$ state in $$^{207}$$Tl, an upper limit of 3.9$$times$$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 $$Delta$$$$n$$ = 0 selection rule to date.



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Category:Astronomy & Astrophysics



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