ENTRY O0307 20220105 O086O030700000001 SUBENT O0307001 20220105 O086O030700100001 BIB 15 41 O030700100002 TITLE Tritium Production by 2.2-Bev Protons on Iron and Its O030700100003 Relation to Cosmic Radiation. O030700100004 AUTHOR (E.L.Fireman) O030700100005 INSTITUTE (1USABNL) O030700100006 REFERENCE (J,PR,97,1303,1955) O030700100007 SAMPLE The target consists of a stack of 8 sheets of hot- O030700100008 rolled steel,0.225 in. thick with 1 in.*4 in. faces. O030700100009 DETECTOR (GEMUC) A 16-cc Geiger Counter was used. O030700100010 FACILITY (SYNCY,1USABNL) The Brookhaven Cosmotron. O030700100011 METHOD (STTA) O030700100012 (INTB) The beam strikes the 1 in.*4 in. face and O030700100013 passes through the 8 sheets of steel. O030700100014 Samples of about 8 g are cut from the center of O030700100015 each steel sheet of target. the samples are heated to O030700100016 about 1800 C degree by an induction heater in an O030700100017 atmosphere (1.0-cm Hg pressure) of carrier hydrogen. O030700100018 By three hours of pumping all the gas is extracted the O030700100019 furnace, during the pumping about 1/4 g of iron O030700100020 evaporates to the furnace walls. To test the O030700100021 completeness of the tritium extraction, several samplesO030700100022 were subjected a second time to this procedure with O030700100023 negative results. O030700100024 ANALYSIS (DECAY) O030700100025 Cross section for zero thickness of the target was O030700100026 extracted from variety of tritium with target depth by O030700100027 an extrapolation to zero. O030700100028 ADD-RES The variation of tritium yield with target depth in O030700100029 iron is measured and indicates a decrease less rapid O030700100030 than an attenuation due to geometric cross sections. O030700100031 MONITOR ((MONIT)13-AL-27(P,X)11-NA-24,CUM,SIG) O030700100032 MONIT-REF (,J.Hudis,J,PR,94,775(PB2),1954) O030700100033 CORRECTION A 20% correction to the front monitor foil and 50% to O030700100034 the rear foil was included because of the Na-24 O030700100035 Produced by secondary neutrons from the target by the O030700100036 (n,alpha) reaction on aluminum. O030700100037 STATUS (TABLE) Tbl. I from Phys.Rev.,97(1955)1303 O030700100038 HISTORY (19960310C) O030700100039 (19970311U) Last checking has been done. O030700100040 (20220105A) SD: Corrections in all Subents. MONITOR O030700100041 code updated. Monit-ref corrected (mistake in the O030700100042 article). O030700100043 ENDBIB 41 0 O030700100044 NOCOMMON 0 0 O030700100045 ENDSUBENT 44 0 O030700199999 SUBENT O0307002 20220105 O086O030700200001 BIB 6 15 O030700200002 REACTION (26-FE-0(P,X)1-H-3,,SIG) O030700200003 COMMENT /by Authors/ The tritium cross section indicates that O030700200004 (1.4+-0.4)*10E-03 tritons/g/sec would be produced in O030700200005 small iron meteorites /a few inches in radius/ in O030700200006 space by cosmic rays of the intensity of those O030700200007 striking the earth's polar regions. In 4*1-E+09 years, O030700200008 (6+-2)10E-06 cc of He-3 per gram of iron results from O030700200009 this cosmic-ray tritium. O030700200010 ERR-ANALYS (ERR-S) Statistical uncertainty O030700200011 (ERR-T) Total uncertainty O030700200012 MISC-COL (MISC1) Average sample depth O030700200013 (MISC2) Sample weight in gramm O030700200014 FLAG (1.) This datum is result of the extrapolation to O030700200015 zero depth and zero thickness. O030700200016 HISTORY (20220105A) SD: SF9=EXP deleted from REACTION code. O030700200017 ENDBIB 15 0 O030700200018 COMMON 2 3 O030700200019 EN MONIT O030700200020 GEV MB O030700200021 2.2 9. O030700200022 ENDCOMMON 3 0 O030700200023 DATA 6 7 O030700200024 DATA ERR-T ERR-S MISC1 MISC2 FLAG O030700200025 MB MB MB G/CM-SQ SEE TEXT NO-DIM O030700200026 62. 7. 1.O030700200027 69. 7. 2.24 4.38 O030700200028 64. 6. 6.72 8.09 O030700200029 66. 6. 11.2 8.09 O030700200030 59. 6. 15.68 8. O030700200031 64. 6. 24.64 7.91 O030700200032 50. 5. 33.6 7.99 O030700200033 ENDDATA 9 0 O030700200034 ENDSUBENT 33 0 O030700299999 ENDENTRY 2 0 O030799999999