ENTRY 10811 19790319 00001081100000001 SUBENT 10811001 19790319 00001081100100001 BIB 12 33 1081100100002 INSTITUTE (1USANBS) 1081100100003 REFERENCE (J,NSE,68,189,7811) 1081100100004 AUTHOR (R.A.SCHRACK,G.P.LAMAZE,O.A.WASSON) 1081100100005 TITLE A MEASUREMENT OF THE B-10(N,AG)LI-7 CROSS SECTION IN 1081100100006 THE KEV ENERGY REGION. 1081100100007 FACILITY (LINAC) NATIONAL BUREAU OF STANDARDS LINEAR ACCELERATOR1081100100008 SAMPLE 96.2-PERCENT B-10, 6.35-CM DIAMETER SINTERED DISK 1081100100009 APPROX 0.30-CM THICK, 0.023 ATOMS/BARN. 1081100100010 METHOD (TOF) TIME OF FLIGHT, PATH LENGTH 200-METERS. THREE 1081100100011 FILTERS USED, 2.5-CM POLYETHYLENE AS MODERATOR, B-10 1081100100012 OVERLAP FILTER TO REMOVE LOW ENERGY NEUTRONS, 2.5-CM 1081100100013 U-238 TO REDUCE GAMMA FLASH. BEAM COLLIMATED TO 10-CM 1081100100014 BY 10-CM AT APPROX 68-METERS. SAMPLE SUSPENDED BY 1081100100015 THREADS, SCATTERING BY MATERIAL ADJACENT TO BEAM WAS 1081100100016 MINIMIZED. 1081100100017 MONITOR (1-H-1(N,EL)1-H-1,,SIG) 1081100100018 CORRECTION CORRECTED FOR BACKGROUND, WRONG ENERGY NEUTRONS, SELF- 1081100100019 SHIELDING OF NEUTRONS, MULTIPLE SCATTERING, AND ELEC- 1081100100020 TRONIC PICKUP BY CABLES. 1081100100021 ERR-ANALYS CONTRIBUTION TO STATISTICAL ERRORS INCLUDE- 1081100100022 -NEUTRON FLUX COUNTS FOR PROTON RECOIL DETECTOR 1081100100023 -AMBIENT BACKGROUND FOR PROTON RECOIL DETECTOR 1081100100024 -478-KEV PHOTON DETECTOR 1081100100025 -BACKGROUND ASSOCIATED WITH PHOTON COUNTS 1081100100026 -BACKGROUND NORMALIZATION 1081100100027 STATISTICAL ERROR LESS THAN 2-PERCENT. 1081100100028 SYSTEMATIC ERRORS CONTRIBUTED BY- 1081100100029 -TIMING UNCERTAINTIES 1081100100030 -FLUX MONITOR UNCERTAINTIES 1081100100031 DATA ERROR IS QUADRATURE SUM OF STATISTICAL AND SYSTEM-1081100100032 ATIC ERRORS. 1081100100033 STATUS (APRVD) APPROVED BY R.A.SCHRACK, 79/5/7. 1081100100034 HISTORY (790103C) 1081100100035 ENDBIB 33 0 1081100100036 NOCOMMON 0 0 1081100100037 ENDSUBENT 36 0 1081100199999 SUBENT 10811002 19790319 00001081100200001 BIB 2 3 1081100200002 REACTION (5-B-10(N,A)3-LI-7,PAR,SIG,,RTE) 1081100200003 DETECTOR (GELI) GELI COAXIAL DETECTOR, AXIS PARALLEL TO BEAM. 1081100200004 (PROPC) HYDROGEN GAS PROPORTIONAL COUNTER FOR NEUTRONS.1081100200005 ENDBIB 3 0 1081100200006 COMMON 1 3 1081100200007 E-LVL 1081100200008 KEV 1081100200009 478. 1081100200010 ENDCOMMON 3 0 1081100200011 DATA 3 36 1081100200012 EN DATA DATA-ERR 1081100200013 KEV B*RT-EV B*RT-EV 1081100200014 4.70 545. 25. 1081100200015 6.35 542. 20. 1081100200016 8.70 554. 14. 1081100200017 11.25 550. 13. 1081100200018 13.50 552. 13. 1081100200019 16.48 549. 10. 1081100200020 20.56 560. 11. 1081100200021 24.63 544. 10. 1081100200022 28.10 535. 10. 1081100200023 32.38 540. 10. 1081100200024 37.70 542. 12. 1081100200025 45.38 545. 10. 1081100200026 54.50 545. 11. 1081100200027 66.56 551. 9. 1081100200028 78.27 561. 12. 1081100200029 88.02 563. 11. 1081100200030 99.70 579. 12. 1081100200031 113.88 580. 12. 1081100200032 131.32 566. 10. 1081100200033 153.10 563. 11. 1081100200034 172.96 571. 19. 1081100200035 188.60 572. 21. 1081100200036 206.46 556. 15. 1081100200037 226.98 552. 11. 1081100200038 250.73 532. 10. 1081100200039 278.40 513. 10. 1081100200040 310.92 493. 11. 1081100200041 349.50 465. 15. 1081100200042 383.07 453. 16. 1081100200043 408.40 436. 14. 1081100200044 436.34 426. 12. 1081100200045 467.24 432. 21. 1081100200046 501.55 406. 17. 1081100200047 539.79 362. 12. 1081100200048 582.57 309. 9. 1081100200049 630.64 250. 9. 1081100200050 ENDDATA 38 0 1081100200051 ENDSUBENT 50 0 1081100299999 SUBENT 10811003 19790319 00001081100300001 BIB 4 9 1081100300002 REACTION (5-B-10(N,A)3-LI-7,PAR,SIG,,RTE) 1081100300003 DETECTOR (NAICR) 7.6 BY 7.6-CM ENCAPUSATED SODIUM IODIDE CRYSTAL1081100300004 WITH PHOTOMULTIPLIER. SET AT ANGLE OF 128-DEGREES WITH1081100300005 INCIDENT NEUTRON BEAM. 1081100300006 (PROPC) HYDROGEN GAS PROPORTIONAL COUNTER FOR NEUTRONS.1081100300007 MONITOR NORMALIZED TO GIVEN VALUE ONLY BETWEEN 3.82 AND 1081100300008 21.7-KEV. 1081100300009 ERR-ANALYS NORMALIZATION UNCERTAINTY IS 2-PERCENT ESTIMATED FROM 1081100300010 STATISTICAL PRECISION OF DATA. 1081100300011 ENDBIB 9 0 1081100300012 COMMON 2 3 1081100300013 E-LVL MONIT 1081100300014 KEV B*RT-EV 1081100300015 478. 550.05 1081100300016 ENDCOMMON 3 0 1081100300017 DATA 3 34 1081100300018 EN DATA DATA-ERR 1081100300019 KEV B*RT-EV B*RT-EV 1081100300020 3.82 566. 57. 1081100300021 4.73 548. 44. 1081100300022 6.00 551. 39. 1081100300023 7.86 552. 28. 1081100300024 9.89 553. 25. 1081100300025 11.72 544. 21. 1081100300026 14.10 549. 19. 1081100300027 17.30 542. 16. 1081100300028 21.70 543. 15. 1081100300029 26.23 558. 14. 1081100300030 30.08 533. 13. 1081100300031 34.84 530. 12. 1081100300032 40.83 543. 11. 1081100300033 48.50 558. 11. 1081100300034 58.56 561. 11. 1081100300035 72.11 581. 11. 1081100300036 85.62 585. 11. 1081100300037 96.84 585. 11. 1081100300038 110.43 599. 10. 1081100300039 127.10 598. 10. 1081100300040 147.85 578. 9. 1081100300041 174.12 576. 9. 1081100300042 198.71 567. 9. 1081100300043 218.11 548. 9. 1081100300044 240.51 539. 9. 1081100300045 266.54 526. 9. 1081100300046 297.03 478. 9. 1081100300047 333.08 447. 8. 1081100300048 376.11 449. 9. 1081100300049 428.05 401. 10. 1081100300050 474.41 408. 11. 1081100300051 509.64 391. 11. 1081100300052 548.94 344. 12. 1081100300053 592.97 306. 14. 1081100300054 ENDDATA 36 0 1081100300055 ENDSUBENT 54 0 1081100399999 SUBENT 10811004 19790319 00001081100400001 BIB 3 6 1081100400002 REACTION 1(5-B-10(N,0),,EN) 1081100400003 2(5-B-10(N,TOT),,WID) 1081100400004 3(5-B-10(N,TOT),,SIG,,RES) 1081100400005 ANALYSIS (MLA) 1081100400006 ERR-ANALYS ONLY STATISTICAL ERRORS USED IN ANALYSIS. ERRORS FOR 1081100400007 WIDTH AND PEAK AMPLITUDE ARE CORRELATED. 1081100400008 ENDBIB 6 0 1081100400009 NOCOMMON 0 0 1081100400010 DATA 6 1 1081100400011 DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3DATA-ERR 31081100400012 KEV KEV KEV KEV MB MB 1081100400013 495. 5. 140. 15. 94. 6. 1081100400014 ENDDATA 3 0 1081100400015 ENDSUBENT 14 0 1081100499999 ENDENTRY 4 0 1081199999999