Production and survival of ⁹⁹Tc in He-shell recurrent thermal pulses [electronic resource]
Saved in:
| Online Access: |
Online Access |
|---|---|
| Corporate Authors: | , |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Livermore, Calif : Oak Ridge, Tenn. :
Lawrence Livermore National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1985.
|
| Subjects: |
| Abstract: | After a brief introduction to the present state of art of nuclear beta-decay studies in astrophysics, we report our recent work on the long-standing ⁹⁹Tc problem. Having combined a detailed study of the recurrent He-shell thermal-pulse, third dredge-up episodes in a 2.25 M/sub solar/ star and an s-process network calculation, we show that a substantial amount of ⁹⁹Tc can be produced by the s-process and can survive to be dredged up to the stellar surface. We stress that the factual observation of ⁹⁹Tc at the surface of certain stars does not necessarily preclude the ²²Ne(..cap alpha..,n)²⁵Mg reaction from remaining as the neutron source for the s-process. The calculated surface abundances of ⁹⁹Tc and elements with neighboring atomic numbers are compared with observations. 43 refs., 5 figs. |
|---|---|
| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 05/30/1985. "ucrl-92789" " conf-850375-12" "DE85014182" 20. Recontre de Moriond, Les Arcs, France, 10 Mar 1985. Becker, S.A.; Mathews, G.J.; Ward, R.A.; Takahashi, K. |
| Physical Description: | Pages: 10 : digital, PDF file. |