ENTRY C3053 20250402 C305300000001 SUBENT C3053001 20250402 20250711 C305300100001 BIB 10 40 C305300100002 TITLE Proton capture on 90Zr revisited C305300100003 AUTHOR (A.Simon,J.Koros,O.Olivas-Gomez,R.Kelmar,E.Churchman, C305300100004 A.M.Clark,C.Harris,S.L.Henderson,S.E.Kelly, C305300100005 P.Millican,A.Palmisano-Kyle,C.S.Reingold,D.Robertson, C305300100006 E.Stech,A.Spyrou,W.P.Tan) C305300100007 REFERENCE (J,EPJ/A,61,57,2025) C305300100008 #doi:10.1140/epja/s10050-025-01521-9 C305300100009 REL-REF (A,C2065002,A.Spyrou+,J,PR/C,88,045802,2013) C305300100010 (A,,C.E.Laird+,J,PR/C,35,1265,1987) C305300100011 INSTITUTE (1USANOT,1USAMSU,1USANCA) C305300100012 FACILITY (VDGT,1USANOT) 10-MV FN tandem at the Nuclear Science C305300100013 Laboratory at the University of Notre Dame. C305300100014 DETECTOR (NAICR) The target was placed at the center of C305300100015 HECTOR, the High Efficiency TOtal absorption C305300100016 spectrometeR. HECTOR is a NaI(Tl) array comprised of C305300100017 16 segments providing a nearly 4pi solid angle C305300100018 coverage for gamma-ray detection. C305300100019 SAMPLE (40-ZR-90,ENR=0.98) An enriched (98(1)%) target of C305300100020 90Zr, with a thickness of 969(48) microg/cm2. The C305300100021 energy spread of the beam from the accelerator is C305300100022 about 5 keV, the energy loss in the target ranged C305300100023 from 34 to 66 keV for the highest and lowest beam C305300100024 energy utilized, respectively. C305300100025 METHOD The gamma rays from the deexcitation cascade C305300100026 following the proton capture were detected in HECTOR. C305300100027 The excited state populated via the proton capture is C305300100028 well defined and given by: Ex = Ecm + Q, where Ecm is C305300100029 the total kinetic energy in the center of mass frame C305300100030 and Q = 5.154 MeV is the reaction Q-value. Thus, the C305300100031 total energy carried by the gamma rays in the C305300100032 deexcitation cascade is ES = Ex. The events where the C305300100033 whole cascade is absorbed by the detector form the C305300100034 sum peak, a peak corresponding to the ES energy. In C305300100035 such case, the capture cross section for the reaction C305300100036 of interest can be obtained from: sigma = C305300100037 NS/(Nt*Nb*epsilon), where NS is the number of counts C305300100038 within the sum peak, Nt is the target areal density, C305300100039 Nb is the number of beam particles impinged on the C305300100040 target and epsilon is the summing efficiency. C305300100041 HISTORY (20250402C) BP C305300100042 ENDBIB 40 0 C305300100043 NOCOMMON 0 0 C305300100044 ENDSUBENT 43 0 C305300199999 SUBENT C3053002 20250402 20250711 C305300200001 BIB 4 24 C305300200002 REACTION (40-ZR-90(P,G)41-NB-91,,SIG) C305300200003 ANALYSIS For each beam energy, the sum peak is fitted with a C305300200004 combination of a Gaussian peak and a linear C305300200005 background to account for incomplete summation C305300200006 events. Then the linear background is subtracted from C305300200007 the sum-peak and the resulting spectrum is integrated C305300200008 within +-3 sigma range around the centroid of the C305300200009 sum-peak. The summing efficiency was determined using C305300200010 Geant4 simulations. gamma-ray cascades corresponding C305300200011 to a total energy equal to ES were used to model the C305300200012 detector response. A combination of cascades with C305300200013 varying number of gamma rays was used in each C305300200014 simulation. C305300200015 ERR-ANALYS (ERR-T) The primary source of uncertainty in the C305300200016 cross-section calculations stems from the C305300200017 efficiency simulations. The relative uncertainty of C305300200018 the simulated efficiency is 10-12%. The beam current C305300200019 was measured with a Faraday cup with an uncertainty C305300200020 of 5% and the target thickness is known with a 5% C305300200021 uncertainty. C305300200022 (ERR-1,10.,12.) Efficiency. C305300200023 (ERR-2) Beam current. C305300200024 (ERR-3) Target thickness. C305300200025 STATUS (TABLE,,A.Simon,J,EPJ/A,61,57,2025) - Table 1 C305300200026 ENDBIB 24 0 C305300200027 COMMON 3 3 C305300200028 EN-RSL ERR-2 ERR-3 C305300200029 KEV PER-CENT PER-CENT C305300200030 5. 5. 5. C305300200031 ENDCOMMON 3 0 C305300200032 DATA 3 16 C305300200033 EN-CM DATA ERR-T C305300200034 MEV MB MB C305300200035 5.93 9.31 1.14 C305300200036 5.74 8.04 0.99 C305300200037 5.34 5.95 0.73 C305300200038 5.14 5.1 0.63 C305300200039 4.95 4.24 0.52 C305300200040 4.75 3.57 0.44 C305300200041 4.45 2.62 0.32 C305300200042 4.25 2.09 0.26 C305300200043 3.96 1.34 0.16 C305300200044 3.76 1.12 0.14 C305300200045 3.56 0.707 0.087 C305300200046 3.36 0.523 0.064 C305300200047 3.16 0.376 0.046 C305300200048 3.16 0.368 0.045 C305300200049 2.97 0.264 0.033 C305300200050 2.77 0.158 0.019 C305300200051 ENDDATA 18 0 C305300200052 ENDSUBENT 51 0 C305300299999 SUBENT C3053003 20250402 20250711 C305300300001 BIB 3 12 C305300300002 REACTION (40-ZR-90(P,G)41-NB-91,,SGV) C305300300003 ANALYSIS The experimental results of this work were used to C305300300004 determine the best theoretical description of C305300300005 reaction cross section for 90Zr(p,gamma)91Nb using C305300300006 the Hauser-Feshbach (HF) formalism. Talys 1.9 code C305300300007 was used to explore combination of various models C305300300008 for level density (LD) and gamma-ray strength function C305300300009 (gSF) to calculate the reaction cross section. The C305300300010 best model from Talys was then used to calculate the C305300300011 reaction rate for 90Zr(p,gamma)91Nb. C305300300012 STATUS (DEP,C3053002) C305300300013 (TABLE,,A.Simon,J,EPJ/A,61,57,2025) - Table 2 C305300300014 ENDBIB 12 0 C305300300015 NOCOMMON 0 0 C305300300016 DATA 2 24 C305300300017 KT-K DATA C305300300018 K9 CM3/S/MOL C305300300019 0.1 3.054E-28 C305300300020 0.15 1.806E-22 C305300300021 0.2 7.874E-19 C305300300022 0.25 3.044E-16 C305300300023 0.3 2.859E-14 C305300300024 0.4 2.178E-11 C305300300025 0.5 2.435E-09 C305300300026 0.6 8.745E-08 C305300300027 0.7 1.506E-06 C305300300028 0.8 1.558E-05 C305300300029 0.9 1.105E-04 C305300300030 1.0 5.855E-04 C305300300031 1.5 1.649E-01 C305300300032 2.0 4.511E+00 C305300300033 2.5 4.192E+01 C305300300034 3.0 2.137E+02 C305300300035 3.5 7.528E+02 C305300300036 4.0 2.083E+03 C305300300037 5.0 1.003E+04 C305300300038 6.0 3.058E+04 C305300300039 7.0 6.229E+04 C305300300040 8.0 9.029E+04 C305300300041 9.0 1.027E+05 C305300300042 10.0 1.002E+05 C305300300043 ENDDATA 26 0 C305300300044 ENDSUBENT 43 0 C305300399999 ENDENTRY 3 0 C305399999999