Mass measurement of 68Se using the beta end-point method

Details Mass measurement of 68Se using the beta end-point method Mass measurement of 68Se using the beta end-point method

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprk10004s&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

There has been much interest in the nuclear astrophysics community recently in the mass of the N=Z waiting point nuclei, such as ^68Se. Waiting point nuclei arise where further proton capture leads to a p-unbound isotone or where the Q value for the (p,γ) reaction is low, making the reverse reaction possible. The ^69Br nucleus is believed to be unbound, thus in order for the rp-process to continue beyond ^68Se, it must wait for β-decay or proceed via 2 proton capture. The time spent at the waiting point is strongly dependent on the mass and lifetime of ^68Se, and a good knowledge of these properties is crucial for nucleosynthesis calculations. A mass measurement of ^68Se has been performed at the Argonne National Laboratory. Recoiling ^68Se nuclei from the ^12C(^58Ni,2n)^68Se reaction at 208 MeV were selected by the Fragment Mass Analyser and implanted onto a moving tape collector system. At regular intervals, the implantation point was moved to a counting station comprised of three high purity Germanium detectors and a plastic scintillation counter. β-γ coincidences were recorded allowing the measurement of the β end-point energy, and hence the mass, of ^68Se to be determined from β spectra gated on known γ-rays in the ^68As daughter nucleus. Results and their implications will be discussed

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