Mass measurements in the vicinity of ther p-process and theν p-process paths with the Penning trap facilities JYFLTRAP and SHIPTRAP

Abstract

The masses of very neutron-deficient nuclides close to the astrophysical rp-and νp-process paths have been determined with the Penning trap facilities JYFLTRAP at JYFL/Jyväskylä and SHIP-TRAP at GSI/Darmstadt. Isotopes from yttrium (Z = 39) to palladium (Z = 46) have been produced in heavy-ion fusion-evaporation reactions. In total 21 nuclides were studied and almost half of the mass values were experimentally determined for the first time:88 Tc,

Influence of nuclear reaction rates on the nucleosynthesis in neutrino-driven winds

“…The trajectory is from the explosion of a 15 M star [1] and is the same as used in several other νp-process studies [10,18,19]. The composition of the ejecta from this trajectory is calculated using a full nuclear reaction network [8], in which we include isotopes up to 164 Dy.…”

“…The composition of the ejecta from this trajectory is calculated using a full nuclear reaction network [8], in which we include isotopes up to 164 Dy. The reaction rates are the same as in [18]. They include experimental rates where available and predictions otherwise.…”

“…They include experimental rates where available and predictions otherwise. The theoretical n-, p-, and α-capture reactions are obtained from the NON-SMOKER code using the masses from the Atomic Mass Evaluation (AME2003) [20], supplemented with mass measurements from [21] and [18]. The theoretical weak interaction rates are taken from [22] and [23].…”

“…[17]. The reaction path partly lies in a region where nuclear masses are unknown [7,18] which affects the proton-capture Q-values. Furthermore, all involved reaction rates are based on theoretical predictions.…”

Precision Penning trap mass measurements on exotic ions: status and perspectives

“…Also for the understanding of the rprocess, one of the greatest challenges of modern nuclear astrophysics [12], masses are of utmost importance. Very recently a large number of high-precision mass values in the vicinity of the rp-process and the νp-process paths have been obtained at the JYFLTRAP (Jyväskylä, Finland) and SHIPTRAP (GSI Darmstadt, Germany) facilities in order to understand these nucleosynthesis processes better [13]. Mass measurements related to nuclear astrophysics have also been performed with LEBIT (East Lansing, USA) [14] and CPT (Argonne, USA) [15].…”