منابع مشابه
p 20 02 The s - process branching at 185
The neutron capture cross section of the unstable nucleus W has been derived from experimental photoactivation data of the inverse reaction W(γ,n)W. The new result of σ = (687 ± 110)mbarn confirms the theoretically predicted neutron capture cross section of W of σ ≈ 700mbarn at kT = 30keV. A neutron density in the classical s-process of nn = (3.8 +0.9 −0.8) × 10 8 cm is derived from the new dat...
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We consider an exponentially growing cell populations modeled as a multi-type branching process in which type i cells are those with i ≥ 0 mutations and we let Zi(t) be the number of type i cells at time t. Type i cells give birth at rate ai and die at rate bi, where the growth rate λi = ai − bi > 0. Thinking of cancer we will usually restrict our attention to the case in which i → λi is increa...
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In this chapter, we will use multitype branching processes with mutation to model cancer. With cancer progression, resistance to therapy, and metastastis in mind, we will investigate τk, the time of the first type k mutation, and σk, the time of the first type k mutation that founds a family line that does not die out, as well as the growth of the number of type k cells. The last three sections...
متن کاملThe (n,γ) cross sections of short-living s-process branching points
An experimental method to determine the (n,γ) cross section of short-living s-process branching points using data of the inverse (γ ,n) reaction is presented. The method was used to observe the branching point nucleus 95Zr because the elemental abundance patterns corresponding to this branching point cannot be reproduced by full stellar models and a possible error source is the neutron capture ...
متن کامل) Γ ( D + s → φ π + ) Branching Ratios
Using a large sample of charm semileptonic decays collected by the FOCUS photoproduction experiment at Fermilab, we present new measurements of two semileptonic branching ratios. We obtain values of Γ(D + →K ∗0 μν) Γ(D+→K−π+π+) = 0.602 ± 0.010 (stat) ± 0.021 (sys) and Γ(D + s →φ μ ν) Γ(D s →φ π+) = 0.54 ± 0.033 (stat) ± 0.048 (sys). Our D+ → K ∗0 μ+ν result includes the effects of the s-wave in...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 2004
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.69.032801