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Neutron capture cross sections of the krypton isotopes and the s-process branching at selenium-79

Neutron capture cross sections of the krypton isotopes and the s-process branching at selenium-79. Walter, G.; Leugers, B.; Kaeppeler, F.; Bao, Z. Y.; Erbe, D.; Rupp, G.; Reffo, G.; Fabbri, F. (Inst. Kernphys., Kernforschungszent. Karlsruhe G.m.b.H., Karlsruhe, Fed. Rep. Ger.). Report, KFK-3652, 94 pp. Avail. INIS From: INIS Atomindex 1984, 15(14), Abstr. No. (English) 1984. DOCUMENT TYPE: Report CA Section: 70 (Nuclear Phenomena) The input data for an anal. of the s-process branching at 79Se [15758-45-9] were significantly improved. The n capture cross sections for the stable Kr isotopes (except 86Kr) were measured between 3 and 240 keV n energy. In addn., statistical model calcns. of the (n,g)-cross sections for all isotopes involved in this branching were performed. With these data and with other exptl. results from the literature a recommended set of Maxwellian av. cross sections was established in the mass region 77 < A < 85. The relevant decay parameters of the involved unstable nuclei and the parameters for the s-process model are discussed as well. On this basis the following aspects are investigated: the temp. during s-process, the decompn. into s- and r-process contributions and the solar Kr abundance.

The stellar beta-decay rate of selenium-79

The stellar beta-decay rate of selenium-79. Klay, N.; Kaeppeler, F. (Inst. Kernphys., Kernforschungszent. Karlsruhe G.In this study，15758-45-9 is also used.m.b.H., Karlsruhe D-7500, Fed. Rep. Ger.). Weak Electromagn. Interact. Nucl., Proc. Int. Symp., 977-9. Edited by: Klapdor, Hans Volker. Springer: Berlin, Fed. Rep. Ger. (English) 1986. CODEN: 55PRAM. DOCUMENT TYPE: Conference CA Section: 70 (Nuclear Phenomena) An exptl. branching ratio was obtained which gives log ft = 4.80 ± 0.08 for the beta decay of 79mSe [15758-45-9]. From this result the temp. dependence was calcd. of the 79Se half-life. The calcd. function t1/2(T) is particularly important for stellar nucleosynthesis in the slow n capture process. From s-process analyses in the mass range A = 80-90 one can deduce the effective stellar half-life of 79Se to range between 2 y and 13 yr. This est. yields immediately an allowed range of temps. between 200 and 320 million degrees. This rather narrow range of s-process temps. depends completely on the small uncertainty of the present exptl. result. .