Zobrazeno 1 - 10
of 1 303
pro vyhledávání: '"Kratz K"'
Autor:
Vescovi, D., Busso, M., Palmerini, S., Trippella, O., Cristallo, S., Piersanti, L., Chieffi, A., Limongi, M., Hoppe, P., Kratz, K. -L.
Publikováno v:
ApJ 863, 115 (2018)
Recent improvements in stellar models for intermediate-mass and massive stars are recalled, together with their expectations for the synthesis of radioactive nuclei of lifetime $\tau \lesssim 25$ Myr, in order to re-examine the origins of now extinct
Externí odkaz:
http://arxiv.org/abs/1807.01058
Autor:
Hill, V., Christlieb, N., Beers, T. C., Barklem, P. S., Kratz, K. -L., Nordström, B., Pfeiffer, B., Farouqi, K.
Publikováno v:
A&A 607, A91 (2017)
We report an abundance analysis for the highly r-process-enhanced (r-II) star CS 29497-004, a very metal-poor giant with Teff = 5013K and [Fe/H]=-2.85, whose nature was initially discovered in the course of the HERES project. Our analysis is based on
Externí odkaz:
http://arxiv.org/abs/1608.07463
We calculate neutron capture cross sections for r-process nucleosynthesis in the $^{48}$Ca region, namely for the isotopes $^{40-44}$S, $^{46-50}$Ar, $^{56-66}$Ti, $^{62-68}$Cr, and $^{72-76}$Fe. While previously only cross sections resulting from th
Externí odkaz:
http://arxiv.org/abs/1504.04456
Publikováno v:
AIP Conference Proceedings 1595, 62 (2014)
Still today, the nucleosynthesis origin of Xe-H in presolar nanodiamonds is far from understood. Historically, possible explanations were proposed by a secondary "neutron-burst" process occurring in the He- or C/O-shells of a type-II supernova (SN-II
Externí odkaz:
http://arxiv.org/abs/1406.0725
Autor:
Best, A., Beard, M., Görres, J., Couder, M., deBoer, R., Falahat, S., Güray, R. T., Kontos, A., Kratz, K. -L., LeBlanc, P. J., Li, Q., O'Brien, S., Özkan, N., Pignatari, M., Sonnabend, K., Talwar, R., Tan, W., Uberseder, E., Wiescher, M.
Publikováno v:
Phys. Rev. C 87, 045805 (2013)
The ratio between the rates of the reactions O-17(\alpha,n)Ne-20 and O-17(\alpha,\gamma)Ne-21 determines whether O-16 is an efficient neutron poison for the s process in massive stars, or if most of the neutrons captured by O-16(n,\gamma) are recycle
Externí odkaz:
http://arxiv.org/abs/1304.6443
Autor:
Quinn, M., Aprahamian, A., Pereira, J., Surman, R., Arndt, O., Baumann, T., Becerril, A., Elliot, T., Estrade, A., Galaviz, D., Ginter, T., Hausmann, M., Hennrich, S., Kessler, R., Kratz, K. -L., Lorusso, G., Mantica, P. F., Matos, M., Moller, P., Montes, F., Pfeiffer, B., Portillo, M., Schatz, H., Schertz, F., Schnorrenberger, L., Smith, E., Stolz, A., Walters, W. B., Wohr, A.
Nuclear structure plays a significant role on the rapid neutron capture process (r-process) since shapes evolve with the emergence of shells and sub-shells. There was some indication in neighboring nuclei that we might find examples of a new N=56 sub
Externí odkaz:
http://arxiv.org/abs/1112.5055
Autor:
Hosmer, P., Schatz, H., Aprahamian, A., Arndt, O., Clement, R. R. C., Estrade, A., Farouqi, K., Kratz, K. -L., Liddick, S. N., Lisetskiy, A. F., Mantica, P. F., Möller, P., Mueller, W. F., Montes, F., Morton, A. C., Ouellette, M., Pellegrini, E., Pereira, J., Pfeiffer, B., Reeder, P., Santi, P., Steiner, M., Stolz, A., Tomlin, B. E., Walters, W. B., Wöhr, A.
Publikováno v:
Phys.Rev.C82:025806,2010
The {\beta} decays of very neutron-rich nuclides in the Co-Zn region were studied experimentally at the National Superconducting Cyclotron Laboratory using the NSCL {\beta}-counting station in conjunction with the neutron detector NERO. We measured t
Externí odkaz:
http://arxiv.org/abs/1011.5255
Autor:
Roederer, I. U., Cowan, J. J., Karakas, A. I., Kratz, K. -L., Lugaro, M., Simmerer, J., Farouqi, K., Sneden, C.
To better characterize the abundance patterns produced by the r-process, we have derived new abundances or upper limits for the heavy elements zinc (Zn), yttrium (Y), lanthanum (La), europium (Eu), and lead (Pb). Our sample of 161 metal-poor stars in
Externí odkaz:
http://arxiv.org/abs/1009.4496
Autor:
Pereira, J., Hosmer, P., Lorusso, G., Santi, P., Couture, A., Daly, J., Del Santo, M., Elliot, T., Goerres, J., Herlitzius, C., Kratz, K. -L., Lamm, L. O., Lee, H. Y., Montes, F., Ouellette, M., Pellegrini, E., Reeder, P., Schatz, H., Schertz, F., Schnorrenberger, L., Smith, K., Stech, E., Strandberg, E., Ugalde, C., Wiescher, M., Woehr, A.
Publikováno v:
Nucl.Instrum.Meth.A618:275-283,2010
The neutron long counter NERO was built at the National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, for measuring beta-delayed neutron-emission probabilities. The detector was designed to work in conjunction with a beta-de
Externí odkaz:
http://arxiv.org/abs/1007.4998
The astrophysical site of the r-process is still uncertain, and a full exploration of the systematics of this process in terms of its dependence on nuclear properties from stability to the neutron drip-line within realistic stellar environments has s
Externí odkaz:
http://arxiv.org/abs/1002.2346