62 Ni(n, γ) and 63 Ni(n, γ) cross sections measured at the n_TOF facility at CERN

PHYSICAL REVIEW C 92, 019903(E) (2015) Erratum: 62Ni(n,γ )and 63Ni(n,γ ) cross sections measured at the n_TOF facility at CERN [Phys. Rev. C 89, 025810 (2014)] C. Lederer, C. Massimi, E. Berthoumieux, N. Colonna, R. Dressler, C. Guerrero, F. Gunsing, F. K¨ appeler, N. Kivel, M. Pignatari, R. Reifarth, D. Schumann, A. Wallner, S. Altstadt, S. Andriamonje, J. Andrzejewski, L. Audouin, M. Barbagallo, V. B ´ ecares, F. Beˇ cv´ aˇ r, F. Belloni, B. Berthier, J. Billowes, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calvi˜ no, D. Cano-Ott, C. Carrapic¸o, F. Cerutti, E. Chiaveri, M. Chin, G. Cort´ es,M.A.Cort ´ es-Giraldo, I. Dillmann, C. Domingo-Pardo, I. Duran, N. Dzysiuk, C. Eleftheriadis, M. Fern´ andez-Ord´ o˜ nez, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garc´ ıa, G. Giubrone, M. B. G´ omez-Hornillos, I. F. Gonc¸alves, E. Gonz´ alez-Romero, F. Gramegna, E. Griesmayer, P. Gurusamy, S. Harrisopulos, M. Heil, K. Ioannides, D. G. Jenkins, E. Jericha, Y. Kadi, D. Karadimos, G. Korschinek, M. Krtiˇ cka, J. Kroll, C. Langer, E. Lebbos, H. Leeb, L. S. Leong, R. Losito, M. Lozano, A. Manousos, J. Marganiec, S. Marrone, T. Martinez, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaers, C. Paradela, A. Pavlik, J. Perkowski, R. Plag, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, A. Riego, F. Roman, C. Rubbia, R. Sarmento, P. Schillebeeckx, S. Schmidt, G. Tagliente, J. L. Tain, D. Tarr´ ıo, L. Tassan-Got, A. Tsinganis, L. Tlustos, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, M. J. Vermeulen, R. Versaci, V. Vlachoudis, R. Vlastou, T. Ware, M. Weigand, C. Weiß, T. J. Wright, and P. ˇ Zugec (n_TOF Collaboration) (Received 20 March 2015; published 23 July 2015) DOI: 10.1103/PhysRevC.92.019903 PACS number(s): 25.40.Lw,25.40.Ny,26.20.Kn,27.50.+e,99.10.Cd An error was discovered in the calculation of the statistical spin factor gs, which was used for determining the capture kernels kγlisted in Table II. This error occurred due to a typo in the formula for calculating gsfrom the resonance parameters provided by SAMMY and affects only the values in Table II. The absolute values for the Maxwellian averaged cross sections are not affected, since those were calculated with the program SAMMY, directly on the basis of the correct parameters. Thus, the astrophysical implications remain unaltered. However, the erroneous capture kernels in Table II had been used to determine the statistical uncertainties for the MACS values in Tables III and IV, corrections yield slightly reduced error bars of the n_TOF data in Fig. 6. Corrections in the text refer to the third sentence in the abstract, which should state: “With a total uncertainty of 4.4%,...” (instead of 4.5%). In Sec. I, the last sentence on p. 2 should read “Maxwellian averaged cross sections were determined from kT =5 to 100 keV with uncertainties between 4.4 and 9.0%” (instead of “4.5 and 10.4%”). In addition, the following corrections are required: Typographical errors lead to minor changes in the enrichment factors of the 63Ni sample in Table Iand to one resonance energy in Table II (28427.5 eV instead of 28417.5 eV). The revised tables are given below. Equation (6) should not contain the factor πin the denominator, and reads correctly as kγ=2 λ2+∞ −∞ σ(E)dE =gs nγ n+γ .(6) Furthermore, the units of all values for γin Sec. IV A 1 should be “eV” (instead of “meV”). TABLE I. Sample characteristics. All samples were of cylindrical shape and 2 cm in diameter. Sample Mass Enrichment (w%) Thickness Chemical (mg) 62Ni 63Ni (10−3atoms/b) form 62Ni 1989 98.0 – 6.20 Metal pellet 63Ni 1156 69.2 8.7 5.68 Oxide grains 197Au 596 – – 0.584 Metal foil 0556-2813/2015/92(1)/019903(3) 019903-1 ©2015 American Physical Society ERRATA PHYSICAL REVIEW C 92, 019903(E) (2015) TABLE II. Resonance energies ERand capture kernels kγof the 62Ni(n,γ ) reaction. When possible, γvalues have been fitted using spin assignments and nvalues from Beer and Spencer [1]. Resonances, which were not seen in any previous measurement are marked by an asterisk. ER(eV) gsn(meV) γ(meV) kγ(meV) ER(eV) gsn(meV) γ(meV) kγ(meV) 2128.6±0.21.71 ±0.13 67911.8±2.6∗225 ±84 4614.8±6.8 1 2545 ±143 70892.9±3.2∗183 ±34 8438.4±1.133.1±1.5 74419.6±2.6 557 ±45 9540.3±0.7 439 ±18 77463 ±25 1 70000 265 ±53 12225.4±1.7∗46.7±7.5 78519.3±8.1 389 ±43 17791.5±1.4 157.8±6.7 81469 ±31∗236 ±40 20602.3±1.5∗112.7±5.3 93944 ±46 340 ±86 24621.9±0.5 231 ±10 95038 ±1033 1 2500000 <1200 28427.5±3.0 373 ±15 104168 ±22 1114 ±218 29507.1±3.2 634 ±26 106550 ±1460 1 4600000 <3300 29960.1±2.4∗41.7±5.9 113203.2±6.7 624 ±132 34473.5±6.4 343 ±35 120052 ±47 970 ±162 38279.5±1.8 938 ±51 131919 ±15∗520 ±109 40547.8±2.2 170 ±20 139011 ±45 1510 ±253 41241.6±2.6 178 ±35 144191 ±25 1463 ±404 43023 ±19 1 340000 496 ±45 147713 ±32∗1704 ±180 45137.1±2.1 481 ±28 149873 ±66 1 140000 584 ±117 53402.4±6.0∗243 ±43 161745 ±19 1672 ±282 57024 ±15 325 ±46 170593 ±21∗1208 ±210 57634 ±9∗212 ±29 180902 ±21∗1338 ±272 63443.6±2.9 270 ±75 187175 ±45 1 90000 1610 ±296 TABLE III. Maxwellian averaged cross sections of the 62Ni(n,γ ) reaction from 5 to 100 keV together with statistical and systematic uncertainties. kT (keV) MACS (mb) Uncertainty (%) Statistical Systematic 5 181.2 0.6 5.2 10 83.2 0.6 4.9 15 50.8 0.7 4.8 20 35.8 0.8 4.4 25 27.4 1.0 4.3 30 22.2 1.3 4.2 40 16.0 2.0 −4.1/+5.1 50 12.5 2.6 −4.1/+6.7 60 10.2 3.1 −4.0/+7.2 80 7.44 3.8 −3.9/+8.0 100 5.75 4.2 −3.8/+8.0 TABLE IV. Contributions to the total uncertainties (in %) for the stellar 62Ni(n,γ ) cross sections (see text for details). kT (keV) 5 30 100 Weighting functions 2 2 2 Normalization 1 1 1 Neutron flux shape 2.0 2.7 2.9 MS at ER=4.6 keV 4.2 2.3 0.9 Missing levels – – +7 Counting statistics 0.6 1.3 4.2 Total 5.2 4.4 −5.7/+9.0 019903-2 ERRATA PHYSICAL REVIEW C 92, 019903(E) (2015) kT (keV) 0 20 40 60 80 100 MACS (mb) 10 2 10 n_TOF, this work KADoNiS v0.3 JENDL 4.0 Nassar et al. (2005) Alpizar-Vicente et al. (2008) Dillmann et al. (2009) Tomyo et al. (2005) FIG. 6. (Color online) Maxwellian averaged cross sections from 5 to 100 keV compared to previous measurements (Alpizar-Vicente et al. [3], Nassar et al. [4], Dillmann et al. [5], and Tomyo et al. [2]). The results obtained with data from the JENDL-4.0 evaluation (dashed line, [6]) and the recommended MACS values of the KADoNiS compilation (solid line, [7]) are included as well. [1] H. Beer and R. R. Spencer, Nucl. Phy. A 240,29 (1975). [2] A. Tomyo, Y. Temma, M. Segawa, Y. Nagai, H. Makii, T. Ohsaki, and M. Igashira, Astrophys. J. Lett. 623,L153 (2005). [3] A. M. Alpizar-Vicente, T. A. Bredeweg, E. I. Esch, U. Greife, R. C. Haight, R. Hatarik, J. M. O’Donnell, R. Reifarth, R. S. Rundberg, J. L. Ullmann, D. J. Vieira, and J. M. Wouters, Phys. Rev. C 77,015806 (2008). [4] H. Nassar, M. Paul, I. Ahmad, D. Berkovits, M. Bettan, P. Collon, S. Dababneh, S. Ghelberg, J. Greene, A. Heger, M. Heil, D. Henderson, C. Jiang, F. K¨ appeler, H. Koivisto, S. O’Brien, R. Pardo, N. Patronis, T. Pennington, R. Plag, K. Rehm, R. Reifarth, R. Scott, S. Sinha, X. Tang, and R. Vondrasek, Phys.Rev.Lett. 94,092504 (2005). [5] I. Dillmann, T. Faestermann, G. Korschinek, J. Lachner, M. Maiti, M. Poutivtsev, G. Rugel, S. Walter, F. K¨ appeler, M. Erhard, A. R. Junghans, C. Nair, R. Schwengner, and A. Wagner, Nucl. Instrum. Methods Phys. Res., Sect. B 268,1283 (2010); 11th International Conference on Accelerator Mass Spectrometry, Rome, Italy, Sept. 14–19, 2008. [6] K. Shibata, O. Iwamoto, T. Nakagawa, N. Iwamoto, A. Ichihara, S. Kunieda, S. Chiba, K. Furutaka, N. Otuka, T. Ohsawa, T. Murata, H. Matsunobu, A. Zukeran, S. Kamada, and J. Katakura, J. Nucl. Sci. Technol. 48,1(2011). [7] I. Dillmann, R. Plag, F. K¨ appeler, and T. Rauscher, Proceeding of the Workshop “EFNUDAT Fast Neutrons – Scientific Workshop on Neutron Measurements, Theory & Applications” held on April 28–30, 2009 at Geel, Belgium, p. 55. 019903-3