The zinc-64(t, helium-3) charge-exchange reaction at 115 MeV per nucleon and application to zinc-64 stellar electron-capture

Details The zinc-64(t, helium-3) charge-exchange reaction at 115 MeV per nucleon and application to zinc-64 stellar electron-capture The zinc-64(t, helium-3) charge-exchange reaction at 115 MeV per nucleon and application to zinc-64 stellar electron-capture

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phdt........13h&link_type=abstract

Proquest Dissertations And Theses 2009. Section 0128, Part 0610 168 pages; [Ph.D. dissertation].United States -- Michigan: Mich

Computer Science

Charge-Exchange Reaction, Zinc-64, Stellar Electron Capture, Gamow-Teller Strength

Scientific paper

A secondary, 115 MeV per nucleon triton beam has been reinstituted at the National Superconducting Cyclotron Laboratory for use in ( t, 3 He) charge- exchange reaction studies. This ( n,p )-type charge-exchange reaction is useful for extracting the full Gamow-Teller (GT) response of the nucleus, overcoming Q-value restrictions present in conventional decay studies. The GT + -strength in the pf -shell nucleus 64 Cu has been determined from the absolute cross section measurement of 64 Zn( t, 3 He) near zero-degrees, exploiting an empirical proportionality between the differential angular cross section and the GT-strength. The detailed features of the GT + -strength distribution in a nucleus has an important impact on electron-capture rates in Type 1a and core- collapse supernovae. The measured GT + -strength in 64 Cu is directly compared with the results of modern pf -shell effective interactions GXPF1a and KB3G which can be used to calculate the GT + contribution to electron-capture on nuclei in supernova simulations. The ( t, 3 He) charge-exchange program at the National Superconducting Cyclotron Laboratory provides stringent tests and can aid the development of such nuclear shell-model calculations.

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