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280 results on '"Rehm K.E."'

1. How well do we understand the reaction rate of C burning?

Author

Courtin S., Jiang C.L., Fruet G., Auranen K., Avila M.L., Ayangeakaa A.D., Back B.B., Bottoni S., Carpenter M., Dickerson C., DiGiovine B., Greene J.P., Henderson D.J., Hoffman C.R., Janssens R.V.F., Kay B.P., Kuvin S.A., Lauritsen T., Pardo R.C., Rehm K.E., Santiago-Gonzalez D., Sethi J., Seweryniak D., Talwar R., Ugalde C., Zhu S., Deibel C.M., Marley S.T., Bourgin D., Haas F., Heine M., Montanari D., Jenkins D.G., Morris L.G., Lefebvre-Schuhl A., Almaraz-Calderon S., Fang X., Tang X.D., Alcorta M., Bucher B., Albers M., and Bertone P.

Subjects
Physics, QC1-999
Abstract

Carbon burning plays a crucial role in stellar evolution, where this reaction is an important route for the production of heavier elements. A particle-γ coincidence technique that minimizes the backgrounds to which this reaction is subject and provides reliable cross sections has been used at the Argonne National Laboratory to measure fusion cross-sections at deep sub-barrier energies in the 12C+12C system. The corresponding excitation function has been extracted down to a cross section of about 6 nb. This indicates the existence of a broad S-factor maximum for this system. Experimental results are presented and discussed.

Published
2017
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2. Cross section measurements in the 12C+12C system

Author

Courtin S., Jiang C.L., Fruet G., Heine M., Jenkins D.G., Adsley P., Morris L.G., Regan P.H., Rudigier M., Montanari D., Della Negra S., de Séréville N., Haas F., Hammache F., Kirsebom O.S., Lesrel J., Meyer A., Auranen K., Avila M.L., Ayangeakaa A.D., Back B.B., Bottoni S., Carpenter M., Dickerson C., DiGiovine B., Greene J.P., Henderson D.J., Hoffman C.R., Janssens R.V.F., Kay B.P., Kuvin S.A., Lauritsen T., Pardo R.C., Rehm K.E., Santiago-Gonzalez D., Sethi J., Seweryniak D., Talwar R., Ugalde C., Zhu S., Deibel C.M., Marley S.T., Bourgin D., Stodel C., Lefebvre-Schuhl A., Almaraz-Calderon S., Fang X., Tang X.D., Alcorta M., Bucher B., Albers M., and Bertone P.

Subjects
Physics, QC1-999
Abstract

The 12C+12C fusion reaction is one of the most important for nuclear astrophysics since it determines the carbon ignition in stellar environments. Two experiments which make use of the gamma-particle coincidence technique to measure the 12C+12C S-factors at deep sub barrier energies are discussed. Results are presented showing a decrease of the S-factor below Ec.m. = 3 MeV.

Published
2017
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3. Fusion reactions of 58,64Ni+124Sn

Author

Galtarossa F., Jiang C.L., Stefanini A.M., Esbensen H., Rehm K.E., Almaraz Calderon S., Avila M.L., Back B.B., Bourgin D., Corradi L., Courtin S., Fioretto E., Goasduff A., Haas F., Mazzocco M., Montanari D., Montagnoli G., Mijiatovic T., Sagaidak R., Santiago-Gonzalez D., Scarlassara F., Strano E., and Szilner S.

Subjects
Physics, QC1-999
Abstract

In order to better understand the influence of transfer in sub-barrier nuclear reactions, cross sections for the system 58,64Ni+124Sn have been measured down to 0.5-1 µb and compared to detailed coupledchannel calculations. In agreement with a phenomenological Q-value systematics, calculations show the importance of including the coupling to the transfer channel for these heavy systems. No clear evidence of fusion hindrance is observed, probably due to the fact that the cross sections measured in this experiment are not low enough for the appearance of that phenomenon.

Published
2016
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4. Fusion measurements of 12C+12C at energies of astrophysical interest

Author

Santiago-Gonzalez D., Jiang C.L., Rehm K.E., Alcorta M., Almaraz-Calderon S., Avila M.L., Ayangeakaa A.D., Back B.B., Bourgin D., Bucher B., Carpenter M.P., Courtin S., David H.M., Deibel C.M., Dickerson C., DiGiovine B., Fang X., Greene J.P., Haas F., Henderson D.J., Janssens R.V.F., Jenkins D., Lai J., Lauritsen T., Lefebvre-Schuhl A., Montanari D., Pardo R.C., Paul M., Seweryniak D., Tang X.D., Ugalde C., and Zhu S.

Subjects
Physics, QC1-999
Abstract

The cross section of the 12C+12C fusion reaction at low energies is of paramount importance for models of stellar nucleosynthesis in different astrophysical scenarios, such as Type Ia supernovae and Xray superbursts, where this reaction is a primary route for the production of heavier elements. In a series of experiments performed at Argonne National Laboratory, using Gammasphere and an array of Silicon detectors, measurements of the fusion cross section of 12C+12C were successfully carried out with the γ and charged-particle coincidence technique in the center-of-mass energy range of 3-5 MeV. These were the first background-free fusion cross section measurements for 12C+12C at energies of astrophysical interest. Our results are consistent with previous measurements in the high-energy region; however, our lowest energy measurement indicates a fusion cross section slightly lower than those obtained with other techniques.

Published
2016
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5. Upper Limit on the molecular resonance strengths in the 12C+12C fusion reaction

Author

Lin C.J., Rehm K.E., Esbensen H., Jiang C.L., Bucher B., Fang X., and Tang X.

Subjects
Physics, QC1-999
Abstract

Carbon burning is a crucial process for a number of important astrophysical scenarios. The lowest measured energy is around Ec.m. =2.1 MeV, only partially overlapping with the energy range of astrophysical interest. The currently adopted reaction rates are based on an extrapolation which is highly uncertain because of potential resonances existing in the unmeasured energy range and the complication of the effective nuclear potential. By comparing the cross sections of the three carbon isotope fusion reactions, 12C+12C, 12C+13C and 13C+13C, we have established an upper limit on the molecular resonance strengths in 12C+12C fusion reaction. The preliminary results are presented and the impact on nuclear astrophysics is discussed.

Published
2011
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6. Fusion of 60Ni + 100Mo below barrier

Author

Greene J.P., Deibel C.M., Di Giovine B., Tang X.D., Singh Pushpendra P., Sewerinyak D., Rehm K.E., Patel N., Back B.B., Corradi L., Stefanini A.M., Jiang C.-L., Fioretto E., Montagnoli G., Scarlassara F., Henderson H.D., Notani M., Marley S.T., and Zhu S.

Subjects
Physics, QC1-999
Abstract

The fusion cross section of 60Ni + 100Mo has been measured down to microbarn level, looking for hindrance at low energy, in a system with positive Q-values for neutron transfer. The measured cross sections look similar to those of the nearby 64Ni + 100Mo, but no conclusive statement can be made at this stage, as to the onset of hindrance in this system.

Published
2011
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18. Commissioning of the HELIOS spectrometer

Author

Lighthall, J.C., Back, B.B., Baker, S.I., Freeman, S.J., Lee, H.Y., Kay, B.P., Marley, S.T., Rehm, K.E., Rohrer, J.E., Schiffer, J.P., Shetty, D.V., Vann, A.W., Winkelbauer, J.R., and Wuosmaa, A.H.

Published
2010
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31. Production and isobaric separation of 63Ni ions for determination of the 62Ni(n,γ) 63Ni reaction cross section at stellar temperatures

Author

Nassar, H., Ghelberg, S., Paul, M., Dababneh, S., Heil, M., Käppeler, F., Plag, R., Ahmad, I., Greene, J.P., Henderson, D.J., Jiang, C.L., Pardo, R.C., Pennington, T., Rehm, K.E., Scott, R., Sinha, S., Tang, X., Vondrasek, R., Koivisto, H., Berkovits, D., Bettan, M., Reifarth, R., Collon, P., O'Brien, S., and Patronis, N.

Published
2004
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32. Elastic scattering of 17F on 208Pb and 17F breakup cross section at Coulomb barrier energies

Author

Romoli, M., Mazzocco, M., Vardaci, E., Di Pietro, M., Bonetti, R., De Francesco, A., De Rosa, A., Glodariu, T., Guglielmetti, A., Inglima, G., La Commara, M., Martin, B., Pierroutsakou, D., Sandoli, M., Scopel, P., Signorini, C., Soramel, F., Stroe, L., Greene, J., Heinz, A., Henderson, D., Jiang, C.L., Liang, J.F., Moore, E.F., Pardo, R.C., Rehm, K.E., and Wuosmaa, A.

Published
2004
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34. First studies of the 8B( α,p) 11C reaction

Author

Rehm, K.E., Jiang, C.L., Greene, J.P., Henderson, D., Janssens, R.V.F., Moore, E.F., Mukherjee, G., Pardo, R.C., Pennington, T., Schiffer, J.P., Sinha, S., Tang, X.D., Siemssen, R.H., Jisonna, L., Segel, R.E., and Wuosmaa, A.H.

Published
2004
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35. Determination of the 8B neutrino spectrum

Author

Winter, W.T., Rehm, K.E., Jiang, C.L., Ahmad, I., Freedman, S.J., Greene, J., Heinz, A., Henderson, D., Janssens, R.V.F., Moore, E.F., Mukherjee, G., Pardo, R.C., Paul, M., Pennington, T., Savard, G., Schiffer, J.P., Seweryniak, D., and Zinkann, G.

Published
2004
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39. Elastic stable intramedullary nailing of midclavicular fractures in athletes

Author

Jubel, A., Andermahr, J., Bergmann, H., Prokop, A., and Rehm, K.E.

Subjects
Sports injuries -- Research, Health, Sports and fitness, Research
Abstract

Br J Sports Med 2003;37:480-484 Background: Intramedullary fixation of midclavicular fractures may be a better option than non-operative treatment for high performance/professional athletes because of the potential reduction in recovery [...]

Published
2003

40. Measurement of the 8B neutrino spectrum

Author

Winter, W., Rehm, K.E., Jiang, C.L., Ahmad, I., Freedman, S.J., Greene, J., Heinz, A., Henderson, D., Janssens, R.V.F., Moore, E.F., Mukherjee, G., Pardo, R.C., Paul, M., Pennington, T., Savard, G., Schiffer, J.P., Seweryniak, D., and Zinkann, G.

Published
2003
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41. Towards measuring the charge radius of 6He and 8He

Author

Müller, P., Wang, L.-B., Bailey, K., Drake, G.W.F., Du, X., Greene, J., Heinz, A.M., Holt, R.J., Henderson, D., Janssens, R.V., Jiang, C.-L., Law, C., Lu, Z.-T., Moore, I.D., O’Connor, T.P., Pardo, R.C., Paul, M., Pennington, T., Rehm, K.E., and Schiffer, J.P.

Published
2003
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42. Design of SECAR a recoil mass separator for astrophysical capture reactions with radioactive beams

Author

Bardayan, D.W., Janssens, R.V.F., Greife, U., Couder, M., Moran, M.T., Wiescher, M., Zeller, A., Smith, M.S., Wrede, C., Rehm, K.E., Montes, F., Blackmon, J., Berg, G.P.A., Perdikakis, G., Smith, K., Wu, X., Schatz, H., Hager, U., Chipps, K.A., and Pain, S.D.

Abstract

A recoil mass separator SECAR has been designed for the purpose of studying low-energy (p,γ) and (α,γ) reactions in inverse kinematics with radioactive beams for masses up to about A = 65. Their reaction rates are of importance for our understanding of the energy production and nucleosynthesis during explosive hydrogen and helium burning. The radiative capture reactions take place in a windowless hydrogen or He gas target at the entrance of the separator, which consists of four Sections. The first Section selects the charge state of the recoils. The second and third Sections contain Wien Filters providing high mass resolving power to separate efficiently the intense beam from the few reaction products. In the following fourth Section, the reaction products are guided into a detector system capable of position, angle and time-of-flight measurements. In order to accept the complete kinematic cone of recoil particles including multiple scattering in the target in the center of mass energy range of 0.2 MeV to 3.0 MeV, the system must have a large polar angle acceptance of ± 25 mrad. This requires a careful minimization of higher order aberrations. The present system will be installed at the NSCL ReA3 accelerator and will be used with the much higher beam intensities of the FRIB facility when it becomes available.

Published
2018
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43. Experimental study of Ar 38 +α reaction cross sections relevant to the Ca 41 abundance in the solar system

Author

Meyer, B.S., Bojazi, M.J., Sethi, J., Kuvin, S.A., Jiang, C.L., Avila, M.L., Ayangeakaa, A.D., Santiago-Gonzalez, D., Rehm, K.E., Talwar, R., Hoffman, C.R., Auranen, K., Winkelbauer, J.R., Harker, J., Mohr, P., and Ugalde, C.

Abstract

In massive stars, the Ca41(n,α)Ar38 and K41(p,α)Ar38 reactions have been identified as the key reactions governing the abundance of Ca41, which is considered as a potential chronometer for solar system formation. So far, due to experimental limitations, the Ca41(n,α)Ar38 reaction rate is solely based on statistical model calculations. In the present study, we have measured the time-inverse Ar38(α,n)Ca41 and Ar38(α,p)K41 reactions using an active target detector. The reactions were studied in inverse kinematics using a 133-MeV Ar38 beam and He4 as the active-gas target. Both excitation functions were measured simultaneously in the energy range of 6.8≤Ec.m.≤9.3 MeV. Using detailed balance the Ca41(n,α)Ar38 and K41(p,α)Ar38 reaction rates were determined, which suggested a 20% increase in the Ca41 yield from massive stars.

Published
2018
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49. Hip Fracture

Author

Burger, Christof, Prokop, Axel, and Rehm, K.E.

Published
1996

50. Development of an Isomeric beam of26Al for nuclear reaction studies

Author

Asher, B.W., primary, Almaraz-Calderon, S., additional, Nusair, O., additional, Rehm, K.E., additional, Avila, M.L., additional, Chen, A.A., additional, Dickerson, C.A., additional, Jiang, C.L., additional, Kay, B.P., additional, Pardo, R.C., additional, Santiago-Gonzalez, D., additional, and Talwar, R., additional

Published
2018
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