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41 results on '"Kunz, Rino"'

1. Analysis and optimization of fabrication of continuous-relief diffractive optical elements

Author

Hessler, Thomas, Rossi, Markus, Kunz, Rino E., and Gale, Michael T.

Subjects
Photoresists -- Research, Laser beams -- Diffraction, Diffraction -- Research, Optics -- Research, Astronomy, Physics
Abstract

The fabrication of continuous-relief diffractive optical elements by direct laser beam writing in photoresist is analyzed. The main limitation and tolerances are identified, and their influence on optical performance is quantified. Fabricated structures show rounded profile steps resulting from the convolution of the desired profile with the writing beam. This leads to a reduction in diffraction efficiency. Optimization techniques are presented to minimize this effect. Scaling the profile depth by a factor of [Mu] > 1 increases the first-order diffraction efficiency for blazed elements. This method is also applied to suppress the zeroth diffraction order in computer-generated holograms. A nonlinear compensation of the exposure data for the Gaussian beam convolution results in an 18% increase of the diffraction efficiency for a blazed grating with a 10-[[micro]meter] period to a value of 79%.

Published
1998

2. Proton and alpha-particle capture reactions at sub-Coulomb energies relevant to the p process

Author

Harissopulos, Sotirios, Lagoyannis, Anastasios, Spyrou, Artemis, Zarkadas, Ch, Galanopoulos, S., Perdikakis, Georgios, Becker, Hans Werner, Rolfs, Claus, Strieder, Frank, Kunz, Rino, Fey, M., Hammer, Johann Wolfgang, Dewald, Alfred, Zell, Karl Oskar, von Brentano, Peter, Julin, Rauno, Demetriou, Paraskevi, Harissopulos, Sotirios, Lagoyannis, Anastasios, Spyrou, Artemis, Zarkadas, Ch, Galanopoulos, S., Perdikakis, Georgios, Becker, Hans Werner, Rolfs, Claus, Strieder, Frank, Kunz, Rino, Fey, M., Hammer, Johann Wolfgang, Dewald, Alfred, Zell, Karl Oskar, von Brentano, Peter, Julin, Rauno, and Demetriou, Paraskevi

Abstract

Several cross-section measurements of proton as well as α-particle capture reactions in the Se-Sb region have been carried out at sub-Coulomb energies with the aim to obtain global input parameters for Hauser-Feshbach (HF) calculations. Some of the results are compared with HF calculations using various optical model potentials and nuclear level densities. © 2005 IOP Publishing Ltd., SCOPUS: cp.j, info:eu-repo/semantics/published

Published
2005

3. The 88Sr(p, γ)89Y reaction at astrophysically relevant energies

Author

Galanopulos, S., Demetriou, Paraskevi, Kokkoris, Michael, Harissopulos, Sotirios, Kunz, Rino, Fey, M., Hammer, Johann Wolfgang, Gyurky, Gy, Fulop, Zsolt, Somorjai, Endre, Goriely, Stéphane, Galanopulos, S., Demetriou, Paraskevi, Kokkoris, Michael, Harissopulos, Sotirios, Kunz, Rino, Fey, M., Hammer, Johann Wolfgang, Gyurky, Gy, Fulop, Zsolt, Somorjai, Endre, and Goriely, Stéphane

Abstract

SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2003

4. A systematic study of proton capture reactions in the Se-Sb region at energies relevant to the p process

Author

Harissopulos, Sotirios, Galanopulos, S., Demetriou, Paraskevi, Spyrou, Artemis, Kriembardis, G., Kokkoris, Michael, Karydas, Andreas Germanos, Zarkadas, Ch, Kunz, Rino, Fey, M., Hammer, Johann Wolfgang, Gyurky, Gy, Fulop, Zsolt, Somorjai, Endre, Dewald, Alfred, Zell, Karl Oskar, von Brentano, Peter, Julin, Rauno, Goriely, Stéphane, Harissopulos, Sotirios, Galanopulos, S., Demetriou, Paraskevi, Spyrou, Artemis, Kriembardis, G., Kokkoris, Michael, Karydas, Andreas Germanos, Zarkadas, Ch, Kunz, Rino, Fey, M., Hammer, Johann Wolfgang, Gyurky, Gy, Fulop, Zsolt, Somorjai, Endre, Dewald, Alfred, Zell, Karl Oskar, von Brentano, Peter, Julin, Rauno, and Goriely, Stéphane

Abstract

A systematic investigation of (p,γ) cross sections of nuclei from Se to Sb is presented. In-beam cross section measurements were carried out at Ep=1.4-5 MeV by using an array of 4 HPGe detectors of 100% relative efficiency shielded with BGO crystals. The S factors obtained are compared with the predictions of the statistical model code MOST., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2003

5. The [Formula Presented] reaction at astrophysically relevant energies

Author

Galanopoulos, S., Somorjai, Endre, Goriely, Stéphane, Demetriou, Paraskevi, Kokkoris, Michael, Harissopulos, Sotirios, Kunz, Rino, Fey, M., Hammer, Johann Wolfgang, Gyurky, Gy, Fulop, Zsolt, Galanopoulos, S., Somorjai, Endre, Goriely, Stéphane, Demetriou, Paraskevi, Kokkoris, Michael, Harissopulos, Sotirios, Kunz, Rino, Fey, M., Hammer, Johann Wolfgang, Gyurky, Gy, and Fulop, Zsolt

Abstract

The cross section of the [Formula Presented] reaction was determined by in-beam measurements at energies [Formula Presented] relevant to the nucleosynthetic p process. At [Formula Presented] the γ angular distributions were obtained by using one HPGe detector of 80% relative efficiency, whereas at [Formula Presented] they were measured by means of an array of four HPGe detectors all shielded with BGO crystals for Compton background supression. Three of them had a relative efficiency [Formula Presented] whereas the remaining one had [Formula Presented] From the resulting cross sections, that lie in the 0.5-μb–5-mb range, astrophysical S factors and reaction rates have been derived. Cross sections, S factors, and reaction rates have also been calculated by means of the statistical model code MOST. A very good agreement between the experimental data and the theoretical predictions has been found. © 2003 The American Physical Society., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2003

6. A systematic study of proton-capture cross sections in the Se-Sb region with relevance to the p-process nucleosynthesis

Author

Harissopulos, Sotirios, Demetriou, Paraskevi, Galanopulos, S., Kokkoris, Michael, Kriembardis, G., Tsagari, P., Spyrou, Artemis, Kalyva, G., Zakadas, C., Karydas, Andreas Germanos, Hammer, Johann Wolfgang, Kunz, Rino, Fey, M., Somorjai, Endre, Gyurky, Gy, Fulop, Zsolt, Dewald, Alfred, Zell, Karl Oskar, von Brentano, Peter, Julin, Rauno, Goriely, Stéphane, Harissopulos, Sotirios, Demetriou, Paraskevi, Galanopulos, S., Kokkoris, Michael, Kriembardis, G., Tsagari, P., Spyrou, Artemis, Kalyva, G., Zakadas, C., Karydas, Andreas Germanos, Hammer, Johann Wolfgang, Kunz, Rino, Fey, M., Somorjai, Endre, Gyurky, Gy, Fulop, Zsolt, Dewald, Alfred, Zell, Karl Oskar, von Brentano, Peter, Julin, Rauno, and Goriely, Stéphane

Abstract

info:eu-repo/semantics/published

Published
2003

7. Cross sections of (p, γ) reactions of N = 50 nuclei relevant to p-process

Author

Harissopulos, Sotirios, Somorjai, Endre, Goriely, Stéphane, Kasemann, S., Dewald, Alfred, Zell, Karl Oskar, Galanopoulos, S., Tsagari, P., Demetriou, Paraskevi, Kuburas, G., Paradellis, Th, Kunz, Rino, Hammer, Josef Wolfgang, Gyurky, Gy, Harissopulos, Sotirios, Somorjai, Endre, Goriely, Stéphane, Kasemann, S., Dewald, Alfred, Zell, Karl Oskar, Galanopoulos, S., Tsagari, P., Demetriou, Paraskevi, Kuburas, G., Paradellis, Th, Kunz, Rino, Hammer, Josef Wolfgang, and Gyurky, Gy

Abstract

The proton capture reactions 89Y(p,γ)90Zr and 88Sr(p,γ)89Y have been investigated at energies Ep = 1.5-3.5 MeV via an array of 4 HPGe detectors of ≈100% rel. efficiency. The resulting cross sections as well as the existing data on the 90Zr(p,γ)91Nb and 92Mo(p,γ)93Tc reactions are compared with improved statistical model calculations carried out using the MOST code., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2001

8. Cross section measurements of the 93Nb(p,γ)94Mo reaction at Ep=1.4-4.9 MeV relevant to the nucleosynthetic p process

Author

Harissopulos, Sotirios, Skreti, E., Tsagari, P., Souliotis, George, Demetriou, Paraskevi, Paradellis, Th, Hammer, Johann Wolfgang, Kunz, Rino, Angulo Perez, Carmen, Goriely, Stéphane, Rauscher, Thomas, Harissopulos, Sotirios, Skreti, E., Tsagari, P., Souliotis, George, Demetriou, Paraskevi, Paradellis, Th, Hammer, Johann Wolfgang, Kunz, Rino, Angulo Perez, Carmen, Goriely, Stéphane, and Rauscher, Thomas

Abstract

SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2001

9. Cross sections of (p,gamma) reactions of N=50 nuclei relevant to p-process

Author

Harissopulos, Sotirios, Galanopulos, S., Tsagari, P., Demetriou, Paraskevi, Kuburas, G., Paradellis, Th, Kunz, Rino, Hammer, Johann Wolfgang, Gyurky, Gy, Somorjai, Endre, Goriely, Stéphane, Kasemann, S., Dewald, Alfred, Zelle, K.O., Harissopulos, Sotirios, Galanopulos, S., Tsagari, P., Demetriou, Paraskevi, Kuburas, G., Paradellis, Th, Kunz, Rino, Hammer, Johann Wolfgang, Gyurky, Gy, Somorjai, Endre, Goriely, Stéphane, Kasemann, S., Dewald, Alfred, and Zelle, K.O.

Abstract

info:eu-repo/semantics/published

Published
2001

10. A compilation of charged-particle induced thermonuclear reaction rates

Author

Angulo Perez, Carmen, Arnould, Marcel, Rayet, Marc, Descouvemont, Pierre, Baye, Daniel Jean, Willain, Christiane, Coc, Alain, Barhoumi, Slimane, Aguer, P., Rolfs, Claus, Kunz, Rino, Hammer, Johann Wolfgang, Mayer, Alice, Paradellis, Th, Kossionides, S., Chronidou, Ch., Spyrou, K., Degl'Innocenti, Scilla, Fiorentini, G. A., Ricci, Barbara, Zavatarelli, Sandra, Provid̂encia, Constaņca D. A., Wolters, H. J., Soares, Joe C., Grama, Cornelia, Rahighi, Javad, Shotter, Alan C., Laméhi-Rachti, Mohammad, Angulo Perez, Carmen, Arnould, Marcel, Rayet, Marc, Descouvemont, Pierre, Baye, Daniel Jean, Willain, Christiane, Coc, Alain, Barhoumi, Slimane, Aguer, P., Rolfs, Claus, Kunz, Rino, Hammer, Johann Wolfgang, Mayer, Alice, Paradellis, Th, Kossionides, S., Chronidou, Ch., Spyrou, K., Degl'Innocenti, Scilla, Fiorentini, G. A., Ricci, Barbara, Zavatarelli, Sandra, Provid̂encia, Constaņca D. A., Wolters, H. J., Soares, Joe C., Grama, Cornelia, Rahighi, Javad, Shotter, Alan C., and Laméhi-Rachti, Mohammad

Abstract

Low-energy cross section data for 86 charged-particle induced reactions involving light (1 ≤ Ζ ≤ 14), mostly stable, nuclei are compiled. The corresponding Maxwellian-averaged thermonuclear reaction rates of relevance in astrophysical plasmas at temperatures in the range from 106 Κ to 1010 Κ are calculated. These evaluations assume either that the target nuclei are in their ground state, or that the target states are thermally populated following a Maxwell-Boltzmann distribution, except in some cases involving isomeric states. Adopted values complemented with lower and upper limits of the rates are presented in tabular form. Analytical approximations to the adopted rates, as well as to the inverse/direct rate ratios, are provided. © 1999 Elsevier Science B.V. All rights reserved., info:eu-repo/semantics/published

Published
1999

11. Cross-section measurments of (p,gamma)-reactions relevant to p-process

Author

Harissopulos, Sotirios, Tsagari, P., Skreti, E., Souliotis, George, Demetriou, Paraskevi, Paradellis, Th, Hammer, Johann Wolfgang, Kunz, Rino, Angulo Perez, Carmen, Goriely, Stéphane, Rauscher, Thomas, Harissopulos, Sotirios, Tsagari, P., Skreti, E., Souliotis, George, Demetriou, Paraskevi, Paradellis, Th, Hammer, Johann Wolfgang, Kunz, Rino, Angulo Perez, Carmen, Goriely, Stéphane, and Rauscher, Thomas

Abstract

info:eu-repo/semantics/published

Published
1999

13. Cross-section measurment of 93Nb(p,gamma) 94Mo in the range 1.4-4 MeV

Author

Harissopulos, Sotirios, Tsagari, P., Skreti, E., Souliotis, George, Paradellis, Th, Hammer, Johann Wolfgang, Kunz, Rino, Angulo Perez, Carmen, Goriely, Stéphane, Rauscher, Thomas, Harissopulos, Sotirios, Tsagari, P., Skreti, E., Souliotis, George, Paradellis, Th, Hammer, Johann Wolfgang, Kunz, Rino, Angulo Perez, Carmen, Goriely, Stéphane, and Rauscher, Thomas

Abstract

info:eu-repo/semantics/published

Published
1998

14. Capture reactions in the helium burning of stars

Author

Kunz, Rino, Mayer, Alice, Joos, K.-D., Knee, H., Müller, Shirley Ann, Nickel, J., Plettner, Ch., Hammer, Johann Wolfgang, Baye, Daniel Jean, Descouvemont, Pierre, Jaeger, Martina, Kölle, V., Wilmes, S., Staudt, G., Mohr, Peter, Chronidou, Ch., Harissopulos, Sotirios, Spyrou, K., Paradellis, Th, Kunz, Rino, Mayer, Alice, Joos, K.-D., Knee, H., Müller, Shirley Ann, Nickel, J., Plettner, Ch., Hammer, Johann Wolfgang, Baye, Daniel Jean, Descouvemont, Pierre, Jaeger, Martina, Kölle, V., Wilmes, S., Staudt, G., Mohr, Peter, Chronidou, Ch., Harissopulos, Sotirios, Spyrou, K., and Paradellis, Th

Abstract

info:eu-repo/semantics/published, Nuclei in the Cosmos. Proceedings, 4th International Symposium, Notre Dame, Indiana (USA), 20 - 27 June 1996

Published
1997

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