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Report No.

Fast-timing study of the $$l$$-forbidden 1/2$$^+$$ $$rightarrow$$ 3/2$$^+$$ $$M1$$ transition in $$^{129}$$Sn

Lic$u{a}$, R.*; Mach, H.*; Fraile, L. M.*; Gargano, A.*; Borge, M. J. G.*; M$u{a}$rginean, N.*; Sotty, C. O.*; Vedia, V.*; Andreyev, A.; Benzoni, G.*; Bomans, P.*; Borcea, R.*; Coraggio, L.*; Contache, C.*; De Witte, H.*; Flavigny, F.*; Fynbo, H.*; Gaffney, L. P.*; Greenlees, P. T.*; Harkness-Brennan, L. J.*; Huyse, M.*; Ib$'a$$~n$ez, P.*; Judson, D. S.*; Konki, J.*; Korgul, A.*; Kr$"o$ll, T.*; Kurcewicz, J.*; Lalkovski, S.*; Lazarus, I.*; Lund, M. V.*; Madurga, M.*; M$u{a}$rginean, R.*; Marroqu$'i$n, I.*; Mihai, C.*; Mihai, R. E.*; Morales, A. I.*; N$'a$cher, E.*; Negret, A.*; Page, R. D.*; Pakarinen, J.*; Pascu, S.*; Paziy, V.*; Perea, A.*; P$'e$rez-Liva, M.*; Picado, E.*; Pucknell, V.*; Rapisarda, E.*; Rahkila, P.*; Rotaru, F.*; Swartz, J. A.*; Tengblad, O.*; Van Duppen, P.*; Vidal, M.*; Wadsworth, R.*; Walters, W. B.*; Warr, N.*

The levels in $$^{129}$$Sn populated from the $$beta^-$$ decay of $$^{129}$$In isomers were investigated at the ISOLDE facility of CERN using the newly commissioned ISOLDE Decay Station. The lowest 1/2$$^+$$ state and the 3/2$$^+$$ ground state in $$^{129}$$Sn are expected to have configurations dominated by the neutron $$s_{1/2}$$ ($$l$$=0) and $$d_{3/2}$$ ($$l$$=2) single-particle states, respectively. Consequently, these states should be connected by a somewhat slow $$l$$-forbidden $$M1$$ transition. Using fast-timing spectroscopy we have measured the half-life of the 1/2$$^+$$ 315.3-keV state, $$T_{1/2}$$ = 19(10) ps, which corresponds to a moderately fast $$M1$$ transition. Shell-model calculations using the CD-Bonn effective interaction, with standard effective charges and $$g$$ factors, predict a 4-ns half-life for this level. We can reconcile the shell-model calculations to the measured $$T_{1/2}$$ value by the renormalization of the $$M1$$ effective operator for neutron holes.



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Category:Physics, Nuclear



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