ENTRY O0420 20001124 0000O042000000001 SUBENT O0420001 20001124 0000O042000100001 BIB 13 43 O042000100002 TITLE Radiochemical Measurements of Be-10 and Be-7 Formation O042000100003 Cross Sections in Oxygen by 135 and 550 MeV Protons. O042000100004 AUTHOR (B.S.AMIN,S.BISWAS,D.LAL,B.L.SOMAYAJULU) O042000100005 INSTITUTE (3INDTAT) O042000100006 REFERENCE (J,NP/A,195,311,1972) O042000100007 REL-REF (N,C0395001,F.YIOU+,J,PR,166,968,1968) Details of the O042000100008 Bombardment of the Water Targets and the Methods Used O042000100009 To Obtain Cocentrated Deposit For the O042000100010 Mass-Spectrometric Analysis. O042000100011 HISTORY (19980330C) O042000100012 (20000426A) Date is Corrected O042000100013 (20001121A) Subentries O0420002-003 are Corrected O042000100014 According to O.Schwerer's Remarks. O042000100015 (20001124U) Last checking has been done. O042000100016 SAMPLE About 30g of Pure Water was Used As Target. O042000100017 Three Deposited Sample Plates of the Water ConcentratesO042000100018 After Irradiation and Mass-Spectrometric Analysis were O042000100019 Used- A, B and C Samples. Since Samples A and B (see O042000100020 TABLE 1) Were Irradiated on the Same Date with 135 MeV O042000100021 Protons and the Expected Be-10 Activity was Small in O042000100022 Each Case, the A and B Samples were Combined. O042000100023 DETECTOR (NAICR).A Flat 5.08 Cm Diameter NaI(Tl) Crystal. O042000100024 The Be-7 Gamma-Activities As Well As the Total ActivityO042000100025 Monitored by the Gas-Flow B-Counter Decreased with a O042000100026 Half-Life of 54 D in Agreement with the Expectations O042000100027 For Be-7 (HALF-LIFE=53.6 D). O042000100028 (GEMUC) Beta Counting was Carried Out Using a Flow-Gas O042000100029 Type Low-Level Geiger Counter of Background About 5 O042000100030 Counts Per Hour and Having a 38% Efficiency For K-40 O042000100031 Beta-Rays. O042000100032 ADD-RES (DECAY) The Net B-Activities Observed in Samples A+B O042000100033 And C. For the Samples Obtained After First Chemical O042000100034 Extraction As Well As Subsequent First and Second O042000100035 Chemical Recyclings was Measured. O042000100036 FACILITY (SYNCY,2FR PAR).135 MeV Proton Beam of the Orsay O042000100037 Synchrocyclotron. O042000100038 (SYNCY,2ZZZCER).550 MeV Proton Beam of the Cern O042000100039 Synchrocyclotron. O042000100040 METHOD (EXTB) O042000100041 (ACTIV) O042000100042 (CHSEP) O042000100043 ANALYSIS (DECAY) O042000100044 STATUS (TABLE) O042000100045 ENDBIB 43 0 O042000100046 NOCOMMON 0 0 O042000100047 ENDSUBENT 46 0 O042000199999 SUBENT O0420002 20001124 0000O042000200001 BIB 4 7 O042000200002 REACTION ((8-O-16(P,X)4-BE-10,,SIG)/ O042000200003 (8-O-16(P,X)4-BE-7,,SIG)) O042000200004 RAD-DET (4-BE-10,DG) O042000200005 (4-BE-7,DG) O042000200006 DECAY-DATA (4-BE-7,53.6D,DG,477.,0.103) O042000200007 (4-BE-10,2.7E+06YR) O042000200008 ERR-ANALYS (ERR-T).The Uncertainty is Reported by Authors. O042000200009 ENDBIB 7 0 O042000200010 NOCOMMON 0 0 O042000200011 DATA 3 2 O042000200012 EN DATA ERR-T O042000200013 MEV NO-DIM NO-DIM O042000200014 135. 0.19 0.01 O042000200015 550. 0.32 0.02 O042000200016 ENDDATA 4 0 O042000200017 ENDSUBENT 16 0 O042000299999 SUBENT O0420003 20001124 0000O042000300001 BIB 6 19 O042000300002 REACTION (8-O-16(P,X)4-BE-10,,SIG) Independent. O042000300003 REL-REF (D,,F.YIOU+,J,JGR,74,2447,1969) O042000300004 COMMENT /by Authors/.In the Case of the Radiochemical Method, O042000300005 A Measurement of the Amount of Be-10 Formed in a Given O042000300006 Irradiation is Difficult Due to the Fact That the O042000300007 Activity of the Short-Lived Be-7 (HALF-LIFE=53.6 D) O042000300008 Interferes with the Measurements of the B-Activity O042000300009 Of Be-10 (E(MAX)=0.55 MEV), the Interference is O042000300010 Appreciable in Spite of the Fact That Be-7 is a Gamma- O042000300011 Emitter. Therefore, It Becomes Necessary to Wait For O042000300012 Several Years After an Irradiation to Allow the Be-7 O042000300013 Activity to Decay to a Level Where Its Presence Does O042000300014 Not Contribute any Significant Counting in the O042000300015 B-Counter Employed For Detection of Be-10. O042000300016 RAD-DET (4-BE-10,B-) O042000300017 (4-BE-7,DG) O042000300018 DECAY-DATA (4-BE-7,53.6D,DG,477.,0.103) O042000300019 (4-BE-10,2.7E+06YR) O042000300020 ERR-ANALYS (ERR-T).The Uncertainty is Reported by Authors. O042000300021 ENDBIB 19 0 O042000300022 NOCOMMON 0 0 O042000300023 DATA 3 2 O042000300024 EN DATA ERR-T O042000300025 MEV MB MB O042000300026 135. 1. 0.06 O042000300027 550. 2.9 0.2 O042000300028 ENDDATA 4 0 O042000300029 ENDSUBENT 28 0 O042000399999 ENDENTRY 3 0 O042099999999