ENTRY C3059 20250506 C305900000001 SUBENT C3059001 20250506 20251001 C305900100001 BIB 9 29 C305900100002 TITLE Deep underground measurement of 11B(alpha,n)14N C305900100003 AUTHOR (T.C.Borgwardt,R.J.deBoer,A.Boeltzig,M.Couder, C305900100004 J.Gorres,A.Gula,M.Hanhardt,Kh.V.Manukyan, C305900100005 Th.Kadlecek,D.Robertson,F.Strieder,M.Wiescher) C305900100006 REFERENCE (J,PR/C,108,035809,2023) C305900100007 #doi:10.1103/PhysRevC.108.035809 C305900100008 INSTITUTE (1USASMT,1USANOT,2GERZFK,1USALAS,1USASRF) C305900100009 FACILITY (ACCEL,1USASRF) The Compact Accelerator System for C305900100010 Performing Astrophysical Research (CASPAR) at the C305900100011 Sanford Underground Research Facility (SURF), in C305900100012 Lead, South Dakota. C305900100013 INC-SPECT 300-700 keV alpha beams from the JN accelerator at C305900100014 the CASPAR underground laboratory. Beam intensities C305900100015 of He+ ions ranged between 60-70 microA. C305900100016 DETECTOR (HE3SP,D4PI) 4pi neutron detector with a polyethylene C305900100017 moderator (30.5x30.5x33 cm3) and 5% borated C305900100018 polyethylene shielding (5 cm). The polyethylene C305900100019 moderator houses two concentric rings of 3He C305900100020 proportional counters, containing a total of 16 C305900100021 detectors. The polyethylene moderates neutrons to C305900100022 thermal energies, which are then detected through the C305900100023 electrical signal induced by the 3He(n,p)3H reaction. C305900100024 SAMPLE (5-B-11,ENR=0.99) Three thick boron targets were C305900100025 used. These targets were created by vacuum C305900100026 evaporation of 99% enriched 11B powder onto a 0.5mm C305900100027 Ta backing. The target thicknesses were determined by C305900100028 performing thick-target resonance scans over the C305900100029 narrow resonance at Ealpha = 606 keV. C305900100030 HISTORY (20250506C) BP C305900100031 ENDBIB 29 0 C305900100032 NOCOMMON 0 0 C305900100033 ENDSUBENT 32 0 C305900199999 SUBENT C3059002 20250506 20251001 C305900200001 BIB 5 24 C305900200002 REACTION (5-B-11(A,N)7-N-14,,SIG) C305900200003 METHOD (PSD) Pulse shape discrimination was used to mitigate C305900200004 the intrinsic alpha activity of the detectors using C305900200005 the rise time discrimination method. The pulse shape C305900200006 discrimination rejected 99% of the intrinsic C305900200007 background of the detectors, while preserving 35% of C305900200008 the neutron signal. Yields from the 11B(alpha,n) 14N C305900200009 reaction were measured using a 4pi neutron detector. C305900200010 Yield data were converted to cross sections as C305900200011 sigma(Eeff) = Yield(E0)/(f*nx), where nx is the C305900200012 number of active target nuclei, Y is the yield at C305900200013 beam energy E0, and Eeff is the effective energy and C305900200014 f is a correction factor. C305900200015 ERR-ANALYS (DATA-ERR) Only the main systematic uncertainty C305900200016 contributions to the cross section are given. C305900200017 (ERR-SYS) Systematic uncertainty. C305900200018 (ERR-1) Stopping power. C305900200019 (ERR-2) Efficiency. C305900200020 (ERR-3) Resolution unfolding. C305900200021 (ERR-4) Beam current. C305900200022 CORRECTION As a broad resonance, it was found that the width C305900200023 could not be treated as constant and had to be C305900200024 corrected for the penetrability. C305900200025 STATUS (CURVE,,T.C.Borgwardt+,J,PR/C,108,035809,2023) Fig. - 3C305900200026 ENDBIB 24 0 C305900200027 COMMON 5 3 C305900200028 ERR-SYS ERR-1 ERR-2 ERR-3 ERR-4 C305900200029 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT C305900200030 15.0 10.0 10.0 5.0 3.0 C305900200031 ENDCOMMON 3 0 C305900200032 DATA 3 29 C305900200033 EN DATA DATA-ERR C305900200034 KEV B B C305900200035 331.422 5.942E-11 2.040E-11 C305900200036 333.407 1.650E-10 3.781E-11 C305900200037 335.061 4.228E-10 C305900200038 335.061 8.351E-10 C305900200039 337.045 9.607E-10 1.899E-10 C305900200040 339.361 3.530E-10 C305900200041 351.929 8.023E-11 C305900200042 363.506 1.197E-10 C305900200043 385.998 3.602E-10 C305900200044 394.267 6.836E-10 C305900200045 400.882 1.463E-09 C305900200046 403.859 2.183E-09 C305900200047 405.843 3.675E-09 C305900200048 407.166 5.942E-09 C305900200049 409.813 7.708E-09 C305900200050 412.459 9.047E-09 C305900200051 417.089 4.673E-09 C305900200052 433.297 2.319E-09 C305900200053 460.750 6.700E-09 C305900200054 473.649 1.020E-08 C305900200055 483.241 1.717E-08 C305900200056 494.157 2.615E-08 C305900200057 503.749 4.228E-08 C305900200058 514.002 6.836E-08 C305900200059 524.917 1.105E-07 C305900200060 534.840 1.752E-07 C305900200061 545.094 3.008E-07 C305900200062 555.678 5.165E-07 C305900200063 566.262 1.000E-06 C305900200064 ENDDATA 31 0 C305900200065 ENDSUBENT 64 0 C305900299999 SUBENT C3059003 20250506 20251001 C305900300001 BIB 4 5 C305900300002 REACTION (5-B-11(A,N)7-N-14,,SIG,,SFC) C305900300003 ANALYSIS Converted S-Factors from the cross-section data. C305900300004 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C305900300005 STATUS (DEP,C3059002) C305900300006 (CURVE,,T.C.Borgwardt+,J,PR/C,108,035809,2023) Fig. - 4C305900300007 ENDBIB 5 0 C305900300008 NOCOMMON 0 0 C305900300009 DATA 3 28 C305900300010 EN DATA DATA-ERR C305900300011 KEV B*MEV B*MEV C305900300012 0.334 2.325E+04 5.792E+03 C305900300013 0.334 7.792E+04 1.146E+04 C305900300014 0.335 1.088E+05 2.034E+04 C305900300015 0.339 1.005E+05 2.135E+04 C305900300016 0.341 3.408E+04 6.369E+03 C305900300017 0.353 4.242E+03 7.374E+02 C305900300018 0.364 3.920E+03 7.324E+02 C305900300019 0.387 4.676E+03 6.877E+02 C305900300020 0.395 7.422E+03 1.290E+03 C305900300021 0.401 1.105E+04 2.206E+03 C305900300022 0.404 1.495E+04 2.199E+03 C305900300023 0.407 2.298E+04 3.380E+03 C305900300024 0.407 3.532E+04 4.711E+03 C305900300025 0.414 4.346E+04 6.977E+03 C305900300026 0.418 1.993E+04 3.200E+03 C305900300027 0.434 6.550E+03 1.139E+03 C305900300028 0.434 5.586E+03 1.176E+03 C305900300029 0.463 6.992E+03 1.122E+03 C305900300030 0.474 7.576E+03 1.216E+03 C305900300031 0.485 9.324E+03 1.371E+03 C305900300032 0.495 1.077E+04 1.583E+03 C305900300033 0.504 1.434E+04 2.493E+03 C305900300034 0.514 1.881E+04 3.515E+03 C305900300035 0.526 2.104E+04 3.378E+03 C305900300036 0.535 2.941E+04 4.720E+03 C305900300037 0.546 3.677E+04 6.390E+03 C305900300038 0.557 4.978E+04 6.641E+03 C305900300039 0.567 7.777E+04 1.248E+04 C305900300040 ENDDATA 30 0 C305900300041 ENDSUBENT 40 0 C305900399999 SUBENT C3059004 20250506 20251001 C305900400001 BIB 4 10 C305900400002 REACTION (5-B-11(A,N)7-N-14,,SGV) C305900400003 ANALYSIS An updated reaction rate was calculated by numerical C305900400004 integration of the 11B(alpha,n)14N R-matrix cross C305900400005 section. C305900400006 ERR-ANALYS (DATA-ERR) no details on sources of uncertainties. C305900400007 STATUS (DEP,C3059002) C305900400008 (COREL,C3059005) With maximum subthreshold state C305900400009 contribution. C305900400010 (TABLE,,T.C.Borgwardt+,J,PR/C,108,035809,2023) Fig. - 6C305900400011 Reaction rates are taken from the supplemental data. C305900400012 ENDBIB 10 0 C305900400013 NOCOMMON 0 0 C305900400014 DATA 4 41 C305900400015 KT DATA -DATA-ERR +DATA-ERR C305900400016 K9 CM3/S/MOL CM3/S/MOL CM3/S/MOL C305900400017 0.014.18127E-433.96545E-434.42961E-43 C305900400018 0.011 2.4035E-412.27929E-412.54578E-41 C305900400019 0.0128.68679E-408.23727E-409.19888E-40 C305900400020 0.0132.15059E-38 2.0392E-382.27684E-38 C305900400021 0.0143.89091E-373.68933E-374.11848E-37 C305900400022 0.0155.40817E-365.12811E-365.72351E-36 C305900400023 0.0166.00672E-355.69597E-356.35611E-35 C305900400024 0.0184.26223E-334.04244E-334.50933E-33 C305900400025 0.021.67801E-311.59184E-311.77512E-31 C305900400026 0.0252.65152E-282.51644E-282.80452E-28 C305900400027 0.037.34556E-266.97227E-267.76751E-26 C305900400028 0.042.69825E-222.56145E-222.85181E-22 C305900400029 0.059.36458E-208.89019E-209.89481E-20 C305900400030 0.068.18432E-187.76865E-188.64842E-18 C305900400031 0.072.94409E-162.79231E-163.11354E-16 C305900400032 0.085.86628E-155.54242E-15 6.2263E-15 C305900400033 0.097.94133E-14 7.4262E-148.50774E-14 C305900400034 0.18.18315E-137.53372E-138.88878E-13 C305900400035 0.116.64347E-126.02248E-127.31273E-12 C305900400036 0.124.29108E-113.84614E-114.76837E-11 C305900400037 0.132.24541E-101.99942E-102.50862E-10 C305900400038 0.149.88164E-108.77569E-101.10635E-09 C305900400039 0.153.76067E-093.34032E-094.20965E-09 C305900400040 0.161.28792E-081.14635E-081.43917E-08 C305900400041 0.181.24274E-071.11404E-071.38065E-07 C305900400042 0.21.00886E-069.11067E-071.11435E-06 C305900400043 0.257.68194E-056.99603E-058.43674E-05 C305900400044 0.3 0.001657730.0015105490.001821716 C305900400045 0.35 0.01513970.0137823790.016662991 C305900400046 0.4 0.07964810.072426106 0.08779271 C305900400047 0.45 0.2916540.2649301440.321900424 C305900400048 0.5 0.8377880.7603082840.925727594 C305900400049 0.6 4.474714.0545436734.953592423 C305900400050 0.7 17.653515.9763081319.57075404 C305900400051 0.8 59.3592 53.6673991 65.8801994 C305900400052 0.9 175.207158.2818027 194.631576 C305900400053 1. 455.347411.0922021506.2075806 C305900400054 1.25 3042.25 2743.246743386.745039 C305900400055 1.5 12119.210918.9494113504.36867 C305900400056 1.75 34395.4 30970.09638353.12988 C305900400057 2. 77645.369880.5104986625.03272 C305900400058 ENDDATA 43 0 C305900400059 ENDSUBENT 58 0 C305900499999 SUBENT C3059005 20250506 20251001 C305900500001 BIB 3 9 C305900500002 REACTION (5-B-11(A,N)7-N-14,,SGV) C305900500003 ANALYSIS An updated reaction rate was calculated by numerical C305900500004 integration of the 11B(alpha,n)14N R-matrix cross C305900500005 section with maximum subthreshold state contribution. C305900500006 STATUS (DEP,C3059002) C305900500007 (COREL,C3059004) Without maximum subthreshold state C305900500008 contribution. C305900500009 (TABLE,,T.C.Borgwardt+,J,PR/C,108,035809,2023) Fig. - 6C305900500010 Reaction rates are taken from the supplemental data. C305900500011 ENDBIB 9 0 C305900500012 NOCOMMON 0 0 C305900500013 DATA 2 41 C305900500014 KT DATA C305900500015 K9 CM3/S/MOL C305900500016 0.016.50241E-43 C305900500017 0.0113.70357E-41 C305900500018 0.0121.32692E-39 C305900500019 0.0133.25797E-38 C305900500020 0.0145.84829E-37 C305900500021 0.0158.06839E-36 C305900500022 0.0168.89791E-35 C305900500023 0.0186.23055E-33 C305900500024 0.022.42318E-31 C305900500025 0.0253.72691E-28 C305900500026 0.031.00859E-25 C305900500027 0.043.56404E-22 C305900500028 0.051.19929E-19 C305900500029 0.061.02167E-17 C305900500030 0.073.59272E-16 C305900500031 0.086.98489E-15 C305900500032 0.09 9.1624E-14 C305900500033 0.19.10791E-13 C305900500034 0.117.15899E-12 C305900500035 0.124.51401E-11 C305900500036 0.132.32436E-10 C305900500037 0.141.01261E-09 C305900500038 0.153.83049E-09 C305900500039 0.161.30743E-08 C305900500040 0.181.25892E-07 C305900500041 0.2 1.0227E-06 C305900500042 0.257.80761E-05 C305900500043 0.30.001686226 C305900500044 0.350.015400045 C305900500045 0.40.080994152 C305900500046 0.450.296463599 C305900500047 0.50.851233115 C305900500048 0.64.542677845 C305900500049 0.7 17.908259 C305900500050 0.860.17739298 C305900500051 0.9177.5257657 C305900500052 1. 461.160256 C305900500053 1.253078.340192 C305900500054 1.512255.15445 C305900500055 1.7534764.72249 C305900500056 2. 78450.2202 C305900500057 ENDDATA 43 0 C305900500058 ENDSUBENT 57 0 C305900599999 SUBENT C3059006 20250506 20251001 C305900600001 BIB 6 14 C305900600002 REACTION 1(5-B-11(A,0),,EN) C305900600003 2(5-B-11(A,0),,J) C305900600004 3(5-B-11(A,0),,PTY) C305900600005 4(5-B-11(A,N),,WID) C305900600006 5(5-B-11(A,N),,WID/STR) C305900600007 REL-REF (A,C0519012,T.R.Wang+,J,PR/C,43,883,1991) Experiment. C305900600008 (D,,G.R.Caughlan+,J,AND,40,283,1988) Estimated from C305900600009 theoretical calculations in ADNDT. C305900600010 ANALYSIS The multichannel R-matrix best fit parameters for the C305900600011 two lowest energy resonances. C305900600012 ERR-ANALYS (DATA-ERR) Fitting uncertainties. C305900600013 FLAG (1.) Tentative parity assignment. C305900600014 STATUS (DEP,C3059002) C305900600015 (TABLE,,T.C.Borgwardt+,J,PR/C,108,035809,2023) Table IIC305900600016 ENDBIB 14 0 C305900600017 NOCOMMON 0 0 C305900600018 DATA 9 2 C305900600019 DATA 1DATA-ERR 1DATA 2DATA 3DATA 4DATA-ERR 4C305900600020 DATA 5DATA-ERR 5FLAG C305900600021 KEV KEV NO-DIM NO-DIM EV EV C305900600022 EV EV NO-DIM C305900600023 336.7 1. 3.5 1. 3.2E-07 0.5E-07C305900600024 6.3E-07 0.9E-07 1. C305900600025 411.0 1. 0.5 -1. 1.2E-04 0.2E-04C305900600026 1.6E-05 0.3E-05 C305900600027 ENDDATA 8 0 C305900600028 ENDSUBENT 27 0 C305900699999 ENDENTRY 6 0 C305999999999