ENTRY D4184 20081127 D064D418400000001 SUBENT D4184001 20081127 D064D418400100001 BIB 17 73 D418400100002 TITLE Excitation functions of alpha-induced nuclear reactionsD418400100003 on natural erbium and natural ytterbium targets D418400100004 AUTHOR (B.Kiraly, F.Tarkanyi, S.Takacs, A.Hermanne, D418400100005 S.F.Kovalev, A.V.Ignatyuk) D418400100006 INSTITUTE (3HUNDEB,2BLGVUB,4RUSFEI) D418400100007 REFERENCE (J,NIM/B,266,549,2008) D418400100008 (C,2007NICE,2,1371,2007) Prelim.data D418400100009 FACILITY (CYCLO,2BLGVUB) CGR-560 cyclotron D418400100010 EXP-YEAR (2006) D418400100011 SAMPLE High purity foils, thicknesses: Er 32., Yb 30., D418400100012 Al 25.5, Ti 12. micron. D418400100013 METHOD (STTA,ACTIV,EXTB,GSPEC) D418400100014 Two stacks of natural erbium and two stacks of natural D418400100015 ytterbium target foils were irradiated, each D418400100016 interlarded with Ti monitor foils. At the beginning of D418400100017 one of the two stacks an Al degrader foil was placed D418400100018 to ensure a small energy shift. D418400100019 Incident alpha energies: 37.5, 37.9, 38.5 and 39.0 MeV,D418400100020 beam currents: 119.5, 108.8, 136.9 and 127.6 nA, D418400100021 irradiation times: 2.00, 2.58, 1.55 and 1.58 hours D418400100022 in the case of the two erbium and two ytterbium stacks,D418400100023 respectively. D418400100024 No chemical separation. D418400100025 The gamma spectra of the target foils were registered D418400100026 by a PC-coupled HPGe detector system just after the D418400100027 end of bombardment and again a month later to get D418400100028 information for the radionuclei of short and long D418400100029 half-life as well and to follow cumulative processes. D418400100030 DETECTOR (HPGE) D418400100031 The sample-detector distance was chosen carefully to D418400100032 avoid pile-up effects and coincidence losses. The D418400100033 detector efficiency was determined placing standard D418400100034 sources at different distances from the detector. D418400100035 MONITOR (22-TI-0(A,X)24-CR-51,,SIG) D418400100036 MONIT-REF (,F.TARKANYI+,R,IAEA-TECDOC-1211,49,2001) Chapter 4 D418400100037 REL-REF (N,,ANDERSEN+,B,ANDERSEN,,1977) D418400100038 The mean bombarding energy of the beam in the D418400100039 subsequent foils was calculated following the D418400100040 polynomial approximation for stopping power of D418400100041 Andersen and Ziegler. D418400100042 DECAY-DATA Decay data were taken from WWW Table of Radioactive D418400100043 Isotopes by Ekstrom and Firestone, database version: D418400100044 2/28/99. D418400100045 ERR-ANALYS (EN-ERR) The energy uncertainty of the beam at the D418400100046 first foil is 0.3 MeV which increases along the stack D418400100047 due to the energy straggling and the uncertainty of D418400100048 target thicknesses and reaches 1.5 MeV at the last D418400100049 foil. D418400100050 (ERR-T) The uncertainties of the cross sections were D418400100051 determined in the standard way: the linearly D418400100052 contributing independent processes were taken into D418400100053 account extracting square root of quadratically summed D418400100054 relative uncertainties, namely: D418400100055 * number of the bombarding particles (7%), D418400100056 * number of the target nuclei (3%), D418400100057 * decay data (3%), D418400100058 * detector efficiency (7%) and D418400100059 * peak area (1-10%). D418400100060 ADD-RES (COMP) The measured experimental data were compared to D418400100061 those found in the literature. D418400100062 (THEO) The measured experimental data were compared to D418400100063 and analyzed with theoretical calculations based on D418400100064 the model code ALICE-IPPE. D418400100065 (TTY-C) On the basis of the new experimental cross D418400100066 sections and the results of the model calculations D418400100067 integral yields were calculated and compared to D418400100068 experimental yields taken from the literature. D418400100069 STATUS (APRVD) S. Takacs, 2007.06.05. D418400100070 HISTORY (20070601C) KB D418400100071 (20080601A) SD: Ref. on Nucl.Istr.&Meth. was added. D418400100072 (20080724A) SD. Reference on Conf.Proc. was corrected. D418400100073 (20080916D) SD: Entry deleted. Data were superseded by D418400100074 entries: D4199, D4203 D418400100075 ENDBIB 73 0 D418400100076 NOCOMMON 0 0 D418400100077 ENDSUBENT 76 0 D418400199999 NOSUBENT D4184002 20081127 D064D418400200001 NOSUBENT D4184003 20081127 D064D418400300001 NOSUBENT D4184004 20081127 D064D418400400001 ENDENTRY 4 0 D418499999999