ENTRY O0869 20030424 0000O086900000001 SUBENT O0869001 20030424 0000O086900100001 BIB 12 36 O086900100002 TITLE Backscattering of 7-Li-ions from oxygen below 6.25 MeVO086900100003 AUTHOR (E.Rauhala, J.Raisanen) O086900100004 INSTITUTE (2SF HLS) Accelerator laboratory O086900100005 REFERENCE (J,NIM/B,35,7,1988) O086900100006 FACILITY (VDGT,2SF HLS) The 7-Li(2+) ion beam was generated by O086900100007 the 5 MV EGP-10-II tandem accelerator O086900100008 (VDG,2SF HLS) The 4-He+ ion beam from the 2.5 MV Van deO086900100009 Graaff accelerator. O086900100010 DETECTOR (SIBAR) A silicon surface barrier detector [100 mm**2,O086900100011 60 mum] positioned at a scattering angle of 170 O086900100012 degrees. The energy resolution of the detection systemO086900100013 was 28 KeV at E/Li= 3 MeV. O086900100014 METHOD (SITA) An Sn-O/2 layer vacuum evaporated on a carbon O086900100015 substrate was used for obtaining the elastic scatteringO086900100016 cross-sections for oxygen. For reference purposes a O086900100017 thick target of the carbon substrate material was also O086900100018 used. O086900100019 (MOMIX) For the absolute oxygen cross section values O086900100020 the Rutherford cross section for tin was assumed to be O086900100021 valid. O086900100022 MONITOR (50-SN-0(P,EL)50-SN-0,,DA) O086900100023 SAMPLE The stoichiometry and thickness of the Sn-O/2 film was O086900100024 determined by 2 MeV 4-He ion backscattering. The O086900100025 atomic ratio of oxygen to tin was observed to be 2:1 O086900100026 with an accuracy of 1%. The film thickness was O086900100027 determined to be 125 nanometers specific gravity of O086900100028 6.95 g/cm3 for Sn-O2. The film thickness corresponds O086900100029 to an energy width of 100 KeV for 3 MeV and 80 KeV for O086900100030 6 MeV 7-Li-ions. O086900100031 No impurities in the film were detected and the O086900100032 impurity concentration in the carbon substrate was O086900100033 found to be insignificant. O086900100034 PART-DET (3-LI-7) O086900100035 ADD-RES Spectra of scattered particles O086900100036 HISTORY (20010512C) O086900100037 (20030424U) Last checking has been done. O086900100038 ENDBIB 36 0 O086900100039 COMMON 1 3 O086900100040 ANG O086900100041 ADEG O086900100042 170. O086900100043 ENDCOMMON 3 0 O086900100044 ENDSUBENT 43 0 O086900199999 SUBENT O0869002 20030424 0000O086900200001 BIB 2 5 O086900200002 REACTION S(8-O-16(3-LI-7,EL)8-O-16,,DA) O086900200003 R(8-O-16(3-LI-7,EL)8-O-16,,DA,,RTH) O086900200004 ERR-ANALYS (ERR-T) The uncertainties given are due to statistical O086900200005 error in calculating the oxygen peak area and possible O086900200006 error from the background subtraction. O086900200007 ENDBIB 5 0 O086900200008 NOCOMMON 0 0 O086900200009 DATA 4 15 O086900200010 EN DATA SERR-T DATA R O086900200011 MEV MB/SR PER-CENT NO-DIM O086900200012 2.75 66.6 5. 1.01 O086900200013 3. 56. 5. 1.01 O086900200014 3.25 50.1 4. 1.06 O086900200015 3.5 43.4 4. 1.07 O086900200016 3.75 37.1 4. 1.05 O086900200017 4. 30. 4. 0.96 O086900200018 4.25 26.2 3. 0.95 O086900200019 4.5 23.1 3. 0.94 O086900200020 4.75 19.6 3. 0.89 O086900200021 5. 17.7 3. 0.89 O086900200022 5.25 14.1 3. 0.78 O086900200023 5.5 8.05 4. 0.49 O086900200024 5.75 4.51 4. 0.3 O086900200025 6. 3.18 5. 0.23 O086900200026 6.25 2.35 5. 0.18 O086900200027 ENDDATA 17 0 O086900200028 ENDSUBENT 27 0 O086900299999 ENDENTRY 2 0 O086999999999