Physics – Nuclear Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004nupha.742..349w&link_type=abstract
Nuclear Physics A, Volume 742, Issue 3-4, p. 349-362.
Physics
Nuclear Physics
13
68Seec, (Β++) [From 12C(58Ni, 2N)], Eγ, Eβ, Βγ-Coin, Qec, Mass Excess, Transitions, Fragment Mass Analyzer, 68Se, 69Br(P, Γ), E Not Given, Analyzed Mass Data, Reaction Q-Values, Astrophysical Implications Discusses
Scientific paper
Precise mass measurements of nuclei along the N=Z line are important input parameters for simulations of the rp-process. Of particular interest is the mass of the 6834 Se34 rp-process waiting point nucleus for determining the possibility of a two-proton capture branch bypassing its slow β-decay. The mass of 68Se was measured via the β-decay endpoint. 68Se was produced by the 12C(58Ni, 2n)68Se reaction and subsequently implanted onto a moving tape system using the fragment mass analyzer at the ATLAS facility of Argonne National Laboratory. A mass excess value of (-54189±240) keV was determined from the β-endpoint measurement of QEC=4710(200) keV. Evaluations of proton separation energies based on the measured mass were used in a one zone type I X-ray burst model. It is concluded that the N=Z=34 isotope 68Se is a waiting point for the rp-process.
Aprahamian Ani
Boutachkov Plamen
Brenner Daeg S.
Davids Cary N.
Fischer Susan M.
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