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Abstract

During the years 2006 to 2009, Rare Isotope Spectroscopic INvestigations at GSI (RISING) have focused on high-resolution γ-ray spectroscopy of exotic nuclear species at rest: following unambiguous discrimination and identification by the FRagment Separator (FRS) and its suite of detectors, the nuclei of interest were implanted in either a passive stopper or a stack of silicon detectors to allow for measurements of delayed ion-γ(γ) or ion-β-γ(γ) correlations. Results concerning experiments along the N ∼ Z line are summarised.

Nuclear structure notes on element 115 decay chains

“…The vast majority of these, namely 33+23+43=99 chains, comprise five subsequent α decays and a concluding spontaneous fission (SF). They are seemingly consistent with an interpretation of only one decay sequence each of the odd-A isotope 287 115 (2+1+0=3 chains) and odd-odd 288 115 (31+22+43=96 chains), respectively [14,16,20,21,22,23]. Using only secure assignments and the minor modification of Table II in Ref.…”

Nuclear spectroscopy with Geant4

“…This initial Geant4-aided assignment was later independently confirmed [4]. The E1 character of those transitions implies very interesting nuclear structure physics [3,[17][18][19].…”

Influence of thenpinteraction on theβdecay of94Pd

“…[7,25,26]. The fragments were identified on an event-by-event basis after their separation using the FRagment Separator (FRS) [26][27][28][29][30][31]. Fig.…”

“…[25] corresponds to the data obtained from this experiment and shows a clean identification of 94 Pd nuclei. The ions were slowed down using an aluminium degrader at the S4 focal plane of the FRS, where the RIS-ING [28][29][30][31] stopped beam setup was located. They were implanted in an 'active stopper' that consisted of nine double sided silicon strip detectors (DSSSD) arranged in three horizontal rows perpendicular to the beam direction, with three detectors in each row.…”

“…γ rays were detected by using the 15 EUROBALL cluster detectors, each cluster comprising seven individual HPGe crystals, which were placed around the 'active stopper'. A timing signal from a scintillator, that was placed upstream from the S4 focal plane, gave information about the implantation time of the nuclei(see, e.g., [28,29,34] for details). This was used to deduce the correlation time between the arrival of the nuclei of interest and their subsequent decays.…”