Measurements of astrophysical reaction rates for radioactive samples
AIP Conference Proceedings
ih~' %q/L?q6" 'a LOS Alamos NaIIo~aI La Dofalow .s ODWWJ by Iho U,IIVWSIW of C~lIfOrmn fof Ih. unll~9MIos D9wImOw of Emw mdof commcl W-7405 -ENG-313 This rcpnrl WMS prcpcrcd us an mxounl o( work qwmnorcd hy nn ngerwyoflhc lJnikd SIaIcn Government. Ncllhcrthc Ilnitcd Stntcs(kwcrnmcn! nor tiny uucncy thcrcol, rw]r nnyufthcir cmployccs, maka wry warranty, qrrenw wr implied, w mnumcn nny lcgMl Iinhiliiy or rcrn~nnihilily for Ihc wxrrucy, u)mplctcne~, or unchrlnccnof an., inkrmntion, appnrntun,
... on, appnrntun, prmlucil or prwxa aiiwkxd, or rcprcmcnh thnt ill UK would nwl infringe privnlcly owned righln, Rc(crcncc herein 10 uny xpuific commcrcinl produu[, prowl, w srviw hy !rndc nnmc, trudcmmk, nwnufnclurcr, or othcrwinc dues nm nccxwurily umsliluie or imply i[n cnthmcmcnl. rcwmnlcnrhion, or rnvoring hy the Ilnikal Staten (iovcrnmcni or any n~cncy Ihcreof, The vicwn nnd opinions or nulhom cnp-ea.wd herein do rrol ncccnmrily~l~le tn reflect Ihmw or Ihc I lnilcd Stwc# (iovcrnmcnl or wry agency ihmc.r)f ABsrRAcr Reaction rates for both bi -ban and stellar nucl ! ?J T thesis can be obtained from the measurement of (n,p and~V cms sections or radioactive nuclei. In the past large backgrounds associate with the sample activity limited these Y s of measurements.to radioisotopes with veg Ion half lives= The advent of # &"'~'eutron~ur~at L I-4MAlarms Neutron t e Iow-ener , hi Scattering C nter SCE has greatly mereascd !he number of nuclei which can be studied. Results of n,p) measurcmcnb on samplee with half lives as short as fifty-three day will be @vcn. The astrophysical to be learned from these data will be dismuwcd. Mditlonal difkulties arc encountered when makin $) n,7 rather than (n, ) measurements. However, with a properly desi e [ 5 ?") etcctor, and with t c high peak veutron intensities now available, n,m easurements can be made for nucki with half lives as short as several weeks. Pro~ess on the Los Akmos (~~crowsection measurement program for 2 radioactive samples will be discussc .