ENTRY 20068 20200801 22902006800000001 SUBENT 20068001 20200801 22902006800100001 BIB 14 48 2006800100002 TITLE The (n,2n) cross section of H-2 in the energy region 2006800100003 4.0 - 6.5 MeV 2006800100004 AUTHOR (M.Holmberg) 2006800100005 REFERENCE (J,NP/A,129,327,1969) 2006800100006 INSTITUTE (2SWDFOA) 2006800100007 FACILITY (VDG,2SWDAE ) 5.5 MeV Van de Graaff accelerator 2006800100008 INC-SOURCE (D-T) D(d,n)He-3 reaction. 2006800100009 SAMPLE The D20 sample was located at the centre of the axial 2006800100010 tube of the large liquid scintillator. 2006800100011 Carbon and H2O samples were used to measure background2006800100012 METHOD (COINC) D(2)-O sample located at the centre of a 2006800100013 large liquid scintillator. Knowing the time 2006800100014 correlation between the two capture pulses the number 2006800100015 of (n,2n) events could be separated from the randomly 2006800100016 distributed background. 2006800100017 Iron collimator, length 1.5 m., 20 cm square with 2006800100018 a conical hole 10 mm in diameter at the entrance and 2006800100019 40 mm at the end. 2006800100020 The iron collimator was surrounded by a lead and 2006800100021 paraffin shield, about 1 m square and 1.5 m in length.2006800100022 DETECTOR (SCIN) GD-loaded liquid scintillator 2006800100023 surrounded by 20 cm of lead and 20 cm of paraffin. 2006800100024 Time correlation measurements via a coincidence 2006800100025 circuit, on thermal capture pulses, (prompt recoil 2006800100026 pulses are removed). 2006800100027 Carbon scatterer used to determine zero correlation. 2006800100028 (SCIN) Plastic scintillator located at the center 2006800100029 of the channel through the scintillator tank during 2006800100030 absolute neutron flux measurement runs. 2006800100031 REL-REF (A,11111002,H.C.Catron+,J,PR,123,218,1961) 2006800100032 (A,,R.M.Frank+,J,PR,93,463,1954) 2006800100033 CORRECTION Multiple scattering correction - 9% at 6 MeV. 2006800100034 Neutron escape along the axial channel of the large 2006800100035 scintillator tank correction to the (n,2n) cross 2006800100036 section was 10% at 6.0 MeV and a rather arbitrary 2006800100037 error of 50% was estimated for the correction. 2006800100038 Variation of neutron detector efficiency with neutron 2006800100039 energy. The correction was 3% at 6 MeV of incident 2006800100040 neutron energy. 2006800100041 ERR-ANALYS (DATA-ERR) Almost no information about source of 2006800100042 uncertainties. At 6 MeV an estimated error due to 2006800100043 multiple scattering is 2%. 2006800100044 STATUS (TABLE) Tbl. 1 from Nucl.Phys.,A129(1969)327 2006800100045 HISTORY (19710428T) From NEDADA file 2006800100046 (20190909A) SD:Updated to new date formats,lower case. 2006800100047 BIB updated. Data presentation updated according 2006800100048 to the table. COMMENT deleted (info moved to REL-REF). 2006800100049 (20200801A) SD: Correction in Subent 002. 2006800100050 ENDBIB 48 0 2006800100051 NOCOMMON 0 0 2006800100052 ENDSUBENT 51 0 2006800199999 SUBENT 20068002 20200801 22902006800200001 BIB 2 4 2006800200002 REACTION (1-H-2(N,2N)1-H-1,,SIG) 2006800200003 HISTORY (20190909A) SD: PART-DET deleted. Data presentation 2006800200004 updated according to the table 1. 2006800200005 (20200801A) SD: Cr. sect. units corrected (b -> mb). 2006800200006 ENDBIB 4 0 2006800200007 NOCOMMON 0 0 2006800200008 DATA 3 8 2006800200009 EN DATA DATA-ERR 2006800200010 MEV MB MB 2006800200011 4.10 13. 8. 2006800200012 4.40 17. 7. 2006800200013 4.60 25. 6. 2006800200014 4.90 34. 6. 2006800200015 5.20 45. 6. 2006800200016 5.85 61. 7. 2006800200017 6.30 60. 7. 2006800200018 6.55 64. 7. 2006800200019 ENDDATA 10 0 2006800200020 ENDSUBENT 19 0 2006800299999 ENDENTRY 2 0 2006899999999