title: Fusion hindrance for a positive-q-value system (24)Mg+(30)Si.
abstract: Measurements of the excitation function for the fusion of (24)Mg+(30)Si (Q=17.89  MeV)have been extended toward lower energies with respect to previous experimental data. The S-factor maximum observed in this large, positive-Q-value system is the most pronounced among such systems studied thus far. The significance and the systematics of an S-factor maximum in systems with positive fusion Q values are discussed. This result would strongly impact the extrapolated cross sections and reaction rates in the carbon and oxygen burnings and, thus, the study of the history of stellar evolution.
authors: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: C L
authors: CL
authors: Jiang
authors: INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy.
authors: A M
authors: AM
authors: Stefanini
authors: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: H
authors: H
authors: Esbensen
authors: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: K E
authors: KE
authors: Rehm
authors: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: S
authors: S
authors: Almaraz-Calderon
authors: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: B B
authors: BB
authors: Back
authors: INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy.
authors: L
authors: L
authors: Corradi
authors: INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy.
authors: E
authors: E
authors: Fioretto
authors: Dipartimento di Fisica e Astronomia, Universitá di Padova, and INFN, Sezione di Padova, IT-35131 Padova, Italy.
authors: G
authors: G
authors: Montagnoli
authors: Dipartimento di Fisica e Astronomia, Universitá di Padova, and INFN, Sezione di Padova, IT-35131 Padova, Italy.
authors: F
authors: F
authors: Scarlassara
authors: Dipartimento di Fisica e Astronomia, Universitá di Padova, and INFN, Sezione di Padova, IT-35131 Padova, Italy.
authors: D
authors: D
authors: Montanari
authors: IPHC and University of Strasbourg, CNRS/IN2P3,67037 Strasbourg Cedex2, France.
authors: S
authors: S
authors: Courtin
authors: IPHC and University of Strasbourg, CNRS/IN2P3,67037 Strasbourg Cedex2, France.
authors: D
authors: D
authors: Bourgin
authors: IPHC and University of Strasbourg, CNRS/IN2P3,67037 Strasbourg Cedex2, France.
authors: F
authors: F
authors: Haas
authors: CSNSM, CNRS/IN2P3 and University Paris-Sud, F-91405 Orsay Campus, France.
authors: A
authors: A
authors: Goasduff
authors: Ruder Boskovic Institute, HR-10002 Zagreb, Croatia.
authors: S
authors: S
authors: Szilner
authors: Ruder Boskovic Institute, HR-10002 Zagreb, Croatia.
authors: T
authors: T
authors: Mijatovic