Neutron capture cross sections of [sup 84,86]Kr and their impact on stellar nucleosynthesis

Mutti, P.; Beer, H.; Brusegan, A.; Corvi, F.; Galleano, R.; Noriega, A.
July 2000
AIP Conference Proceedings;2000, Vol. 529 Issue 1, p687
Academic Journal
The Krypton isotopes lie in one of the most sensitive, complicated and, therefore, interesting region of the s-process nucleosynthesis. This mass region, in fact, receives substantial contribution from both the weak and the main component of the s-process. In addition to that, the branching in the s-process path at [sup 85]Kr can deliver important information on the neutron flux. The total cross section of [sup 84]Kr and the capture cross section of [sup 86]Kr have been measured and the MAC cross sections calculated with the aim to reduce the uncertainties in the s-process models due to nuclear parameters. © 2000 American Institute of Physics.


Related Articles

  • Towards trace detection of [sup 85]Kr by two-step excitation and field ionization. Li, Xinghua; Lassen, Jens; Schuessler, Hans A. // AIP Conference Proceedings;2001, Vol. 584 Issue 1, p59 

    We have implemented a new laser-based detection scheme for the rare krypton isotopes. The scheme utilizes two-step excitation of metastable krypton atoms in a nearly perfect three-level system followed by field ionization. The detection scheme was realized experimentally with a mass-separated...

  • Isotope shifts of Kr Rydberg-levels by resonance ionization. Li, Xinghua; Lassen, Jens; Bhatti, M. I.; Schuessler, Hans A. // AIP Conference Proceedings;2001, Vol. 584 Issue 1, p275 

    Accurate spectroscopic data on isotope shifts of high-lying states, in particular Rydberg-states are rare, because of their small values. We report results on transitions involving an intermediate 5p[sup 2][5/2][sub 3] level and high-lying Rydberg-levels. The excitation scheme utilizes two-step...

  • Collisional ionization of krypton and xenon excited states. Li, Xinghua; Lassen, Jens; Schuessler, Hans A. // AIP Conference Proceedings;2001, Vol. 584 Issue 1, p271 

    We investigated the collisional ionization of krypton and xenon atoms in a mass-separated atomic beam in collinear fast-beam laser spectroscopy. It is found that collisional ionization can be used for sensitive detection of recyclable and partially recyclable transitions. It can also be used to...

  • Isotopic krypton mixtures revisited: Vapor pressure isotope effects. Lopes, J. N. Canongia; Rebelo, L. P. N.; Bigeleisen, Jacob // Journal of Chemical Physics;11/15/2002, Vol. 117 Issue 19, p8836 

    The theory of nonideal, multicomponent, isotopic mixtures is used to calculate the vapor pressures of pure [SUP80]Kr(l) and [SUP84]Kr(l) from data on isotopic mixtures. The correction to ideal solution behavior, A, is found to be much smaller than the statistical deviations in the experimental...

  • From helium-6 to krypton-81. Lu, Zheng-Tian // AIP Conference Proceedings;2001, Vol. 596 Issue 1, p171 

    A new method of ultrasensitive trace-isotope analysis has been developed based upon the technique of laser manipulation of neutral atoms, it has been used to count individual [sup 85]Kr and [sup 81]Kr atoms present in a natural krypton sample with isotopic abundances in the range of 10[sup 11]...

  • Kr excimers produced by soft x rays emitted from a laser-produced plasma. Kubodera, Shoichi; Ikeda, Masaki; Kawanaka, Junji; Sasaki, Wataru // Applied Physics Letters;9/14/1998, Vol. 73 Issue 11 

    We have demonstrated an excitation method to produce Kr[sub 2][sup *] by using soft x rays emitted from a laser-produced plasma. We have found that Kr[sup 2+] ions were directly produced by photoionization of Kr atoms by soft x rays. The behavior of Kr[sub 2][sup *] emission was similar to that...

  • Capture of Ultracold Neutrons in Thin Absorbing Films. Lomonosov, V. V.; Gurevich, A. I. // Journal of Experimental & Theoretical Physics;Nov2002, Vol. 95 Issue 5, p800 

    The dependence of the ultracold neutron capture cross section in targets with a thickness smaller than the neutron wavelength is calculated in the time-dependent quantum theory. It is shown that, for low velocities of neutrons, their capture cross section s[sub c]~v, i.e., tends to zero as the...

  • neutron capture analysis.  // Taber's Cyclopedic Medical Dictionary (2009);2009, Issue 21, p1581 

    A definition of the term "neutron capture analysis," which refers to the use of a neutron by an atomic nucleus to identify the presence of substances, is presented.

  • Recent progress in understanding nucleosynthesis via rapid neutron capture. Qian, Yong-Zhong // AIP Conference Proceedings;2000, Vol. 549 Issue 1, p737 

    I discuss the recent progress in our understanding of nucleosynthesis via rapid neutron capture, the ...-process, based on meteoritic data for the early solar system and observations of stars ar low metallicities. At present, all data require that there be two distinct kinds of ...-process...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics