Electromagnetic transitions in neutron-richCl40

Abstract

In-beam y rays from excited states of the neutron-rich (T, 3) nucleus~C l have been identi6ed in a threefold coincidence experiment in which y rays and light charged particles were observed. The resulting decay scheme is presented, and implications for the structure of low-lying levels in~C 1 are discussed in light of recent data from charge-exchange and PMecay work. The ordering of levels would seem to be quite difkrent from the predictions of recent shell-model calculations.The most recent measurement of the mass of~C I and the first observation of excited levels of this exotic neutron-rich nucleus were by Fifield et al. ,' who used the

β decay ofS40,42andCl43Winger1, Mantica2, Ronningen3 2006Phys. Rev. C27191View full textAdd to dashboardCite

“…This can be understood from the fact that J = 1 transitions should dominate the decay so that states with spins of J 3 are unlikely. The 211-keV level appears to be the first excited state in 40 Cl based both on the results presented here and the heavy-ion reactions [10,11]. In these earlier measurements, the 211-keV level was only weakly populated.…”

“…Excited states in 40 Cl were first identified in ( 7 Li, 7 Be) and ( 11 Be, 11 C) chargeexchange reactions on 40 Ar [9]. Two additional experiments using the 9 Be( 36 S,αp) 40 Cl reaction [10,11] have resulted in identification of states with spins from 1 to 8, most likely all being of negative parity. Of these, only a state at 211 keV could be positively associated with a γ ray observed in the β-decay experiment [5,11].…”

Structure of chlorine isotopes populated by heavy ion transfer reactions

“…In addition, we observed 219.0 and 563.3 keV transitions. The 219.0 keV transition was reported in the previous studies [45][46][47]55,56]. However, as its placement in the level scheme has been controversial, the transition has been listed in Table II but it was not placed in the level scheme in Fig.…”

“…The γ -ray transitions are listed in Table II. Previous information on 40 Cl was obtained from β-decay [54] and heavy ion fusion studies [55,56]. The same nucleus was also populated in the "thick" -target γ -γ coincidence measurements [46,47].…”