ENTRY 22222 19930329 00002222200000001 SUBENT 22222001 19930329 00002222200100001 BIB 15 50 2222200100002 REFERENCE (J,PR/C,43,(4),1831,9104) 2222200100003 TITLE -MEASUREMENT OF THE LONG-LIVED 26-AL PRODUCTION CROSS 2222200100004 SECTION IN THE 27-AL(N,2N) REACTION. 2222200100005 AUTHOR (T.NAKAMURA,H.SUGITA,M.IMAMURA,Y.UWAMINO,H.NAGAI, 2222200100006 K.KOBAYASHI) 2222200100007 INSTITUTE (2JPNTOK) M.IMAMURA, Y.UWAMINO, H.NAGAI, K.KOBAYASHI. 2222200100008 EXPERIMENTAL SITE. 2222200100009 (2JPNTOH) T.NAKAMURA, H.SUGITA 2222200100010 FACILITY (CYCLO,2JPNTOK) THE SF CYCLOTRON OF THE INSTITUTE FOR 2222200100011 NUCLEAR STUDY WAS USED FOR THE NEUTRON IRRADIATION. 2222200100012 (VDGT,2JPNTOK) THE TANDEM VAN DE GRAAFF OF THE RESEARCH2222200100013 CENTER FOR NUCLEAR SCIENCE AND TECHNOLOGY WAS USED FOR2222200100014 ACCELERATOR MASS SPECTROMETRY. 2222200100015 INC-SOURCE (P-BE ) NEUTRONS WERE PRODUCED BY BOMBARDING A 1 MM 2222200100016 THICK BERYLLIUM TARGET WITH 3 - 5 MICROAMP PROTON 2222200100017 BEAMS OF ENERGIES 20, 22.5, 25, 27.5, 30, 32.5 AND 2222200100018 37.5 MEV. THE TARGET WAS BACKED BY A WATER COOLANT, 2222200100019 WHICH FULLY STOPPED THE PROTONS. 2222200100020 INC-SPECT .THE SEMI-MONOENERGETIC NEUTRON SPECTRA AT 0 DEGREES 2222200100021 WERE MEASURED WITH A NE213 SCINTILLATOR PLACED 1.3 M 2222200100022 FROM THE BE TARGET. N-GAMMA DISCRIMINATION WAS USED 2222200100023 AND THE PULSE-HEIGHT DISTRIBUTIONS WERE UNFOLDED INTO 2222200100024 ENERGY SPECTRA WITH A REVISED FERDO CODE. ROOM-SCAT- 2222200100025 TERED NEUTRONS WERE ALSO MEASURED BY SHIELDING THE 2222200100026 DIRECT TARGET FLUX WITH A 10 CM BY 10 CM BY 50 CM LONG2222200100027 SHADOW BAR. 2222200100028 METHOD (ASEP ) THE 26-AL/27-AL RATIO WAS DETERMINED BY ACCELE-2222200100029 RATOR MASS SEPARATION TECHNIQUES. A STANDARD SAMPLE OF2222200100030 ALUMINUM-CHLORIDE FROM NBS WITH A CERTIFIED ACTIVITY 2222200100031 OF 38.79 DECAYS/SEC/GRAM +/- 1.1 PER-CENT WAS USED FOR2222200100032 CALIBRATION. 2222200100033 DETECTOR (SCIN ) A 51 MM DIAMETER BY 51 MM LONG NE213 LIQUID 2222200100034 SCINTILLATOR WITH N-GAMMA DISCRIMINATION WAS USED TO 2222200100035 DETERMINE THE INCOMING NEUTRON SPECTRA. 2222200100036 PART-DET (13-AL-26-G) DETECTED IN ACCELERATOR MASS SEPARATION. 2222200100037 SAMPLE .THE ALUMINUM SAMPLES WERE OF MARZ GRADE, 5 MM BY 5 MM 2222200100038 IN SIZE AND 50 MU THICK, WITH PURITY 99.999 PER-CENT. 2222200100039 THE SAMPLES WERE IRRADIATED AT TWO POSITIONS OF 5 AND 2222200100040 10 CM FROM THE BE TARGET FOR ABOUT 15 HR. 2222200100041 ERR-ANALYS (DATA-ERR) INCLUDES STATISTICAL ERRORS AS WELL AS THE 2222200100042 UNCERTAINTIES IN THE NEUTRON SPECTRA AND THE UNFOLDING2222200100043 PROCEDURE. 2222200100044 ANALYSIS (UNFLD) THE CROSS SECTIONS WERE OBTAINED BY UNFOLDING 2222200100045 TECHNIQUES, TAKING INTO ACCOUNT THE MEASURED INCIDENT 2222200100046 NEUTRON SPECTRA AT EACH PROTON ENERGY. THE UNFOLDING 2222200100047 WAS PERFORMED USING THE NEUPAC CODE. A CALCULATION 2222200100048 WITH ALICE GAVE START VALUES FOR THE UNFOLDING. 2222200100049 STATUS .DATA TAKEN FROM MAIN REF. 2222200100050 HISTORY (921205C) N.O. 2222200100051 (930329E) 2222200100052 ENDBIB 50 0 2222200100053 NOCOMMON 0 0 2222200100054 ENDSUBENT 53 0 2222200199999 SUBENT 22222002 19930329 00002222200200001 BIB 3 4 2222200200002 REACTION (13-AL-27(N,2N)13-AL-26-G,,SIG) 2222200200003 STATUS .DATA TAKEN FROM MAIN REF. 2222200200004 HISTORY (921205C) N.O. 2222200200005 (930329E) 2222200200006 ENDBIB 4 0 2222200200007 NOCOMMON 0 0 2222200200008 DATA 3 7 2222200200009 EN-MEAN DATA DATA-ERR 2222200200010 MEV MB MB 2222200200011 1.5300E+01 3.5150E+01 1.1160E+01 2222200200012 1.8200E+01 7.9340E+01 1.3930E+01 2222200200013 2.1000E+01 8.9870E+01 1.1590E+01 2222200200014 2.3400E+01 9.2370E+01 1.6290E+01 2222200200015 2.5900E+01 8.2030E+01 1.0340E+01 2222200200016 2.8500E+01 6.9850E+01 1.3830E+01 2222200200017 3.3600E+01 4.1960E+01 1.2600E+01 2222200200018 ENDDATA 9 0 2222200200019 ENDSUBENT 18 0 2222200299999 ENDENTRY 2 0 2222299999999