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Title: Prompt dipole {gamma}-ray emission: a new cooling mechanism in fusion heavy-ion reactions

Abstract

We investigated the prompt dipole {gamma}-ray emission, related with entrance channel charge asymmetry effects, in the 40Ar + 92Zr and 36Ar + 96Zr fusion-evaporation reactions at Elab= 15.1 and 16 MeV/nucleon, respectively, with the aim to probe its evolution with incident energy. These reactions populate, through entrance channels having different charge asymmetries, the same compound nucleus at an average excitation energy of 304 MeV with identical spin distribution. It was shown that the dipole {gamma}-ray intensity in the bremsstrahlung subtracted linearized spectra increases by {approx}14% for the more charge asymmetric system. This result, associated with those reported for the 32,36S + 100,96Mo reaction pair at lower beam energies, implies a ''rise and fall'' trend of the prompt dipole {gamma}-ray emission with beam energy with a maximum value at Elab= 9 MeV/nucleon.

Authors:
; ; ;  [1]; ; ; ; ;  [1];  [2]; ; ; ; ; ; ; ; ; ; more »;  [3];  [4] « less
  1. INFN, Sezione di Napoli, Naples (Italy)
  2. (Italy)
  3. Dip. di Fisica e Astronomia, Univ. di Catania, Catania (Italy)
  4. (Italy) (and others)
Publication Date:
OSTI Identifier:
21054815
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 884; Journal Issue: 1; Conference: 6. Latin American symposium on nuclear physics and applications, Iguazu (Argentina), 3-7 Oct 2005; Other Information: DOI: 10.1063/1.2710580; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ARGON 36; ARGON 40; ASYMMETRY; BREMSSTRAHLUNG; COMPOUND NUCLEI; DIPOLES; EVAPORATION MODEL; EXCITATION; GIANT RESONANCE; HEAVY ION FUSION REACTIONS; MEV RANGE; MOLYBDENUM 100 TARGET; MOLYBDENUM 96 TARGET; PHOTON EMISSION; PROMPT GAMMA RADIATION; SPIN; SULFUR 32 REACTIONS; SULFUR 36 REACTIONS; ZIRCONIUM 92; ZIRCONIUM 96

Citation Formats

Pierroutsakou, D., Boiano, A., Di Pietro, M., Romoli, M., Martin, B., Inglima, G., De Rosa, A., La Commara, M., Sandoli, M., Dip. di Scienze Fisiche, Univ. di Napoli 'Federico II', Naples, Agodi, C., Alba, R., Colonna, M., Coniglione, R., Del Zoppo, A., Di Toro, M., Maiolino, C., Pellegriti, N., Piatelli, P., Santonocito, D., Sapienza, P., and INFN, Laboratori Nazionali del Sud, Catania. Prompt dipole {gamma}-ray emission: a new cooling mechanism in fusion heavy-ion reactions. United States: N. p., 2007. Web. doi:10.1063/1.2710580.
Pierroutsakou, D., Boiano, A., Di Pietro, M., Romoli, M., Martin, B., Inglima, G., De Rosa, A., La Commara, M., Sandoli, M., Dip. di Scienze Fisiche, Univ. di Napoli 'Federico II', Naples, Agodi, C., Alba, R., Colonna, M., Coniglione, R., Del Zoppo, A., Di Toro, M., Maiolino, C., Pellegriti, N., Piatelli, P., Santonocito, D., Sapienza, P., & INFN, Laboratori Nazionali del Sud, Catania. Prompt dipole {gamma}-ray emission: a new cooling mechanism in fusion heavy-ion reactions. United States. doi:10.1063/1.2710580.
Pierroutsakou, D., Boiano, A., Di Pietro, M., Romoli, M., Martin, B., Inglima, G., De Rosa, A., La Commara, M., Sandoli, M., Dip. di Scienze Fisiche, Univ. di Napoli 'Federico II', Naples, Agodi, C., Alba, R., Colonna, M., Coniglione, R., Del Zoppo, A., Di Toro, M., Maiolino, C., Pellegriti, N., Piatelli, P., Santonocito, D., Sapienza, P., and INFN, Laboratori Nazionali del Sud, Catania. Mon . "Prompt dipole {gamma}-ray emission: a new cooling mechanism in fusion heavy-ion reactions". United States. doi:10.1063/1.2710580.
@article{osti_21054815,
title = {Prompt dipole {gamma}-ray emission: a new cooling mechanism in fusion heavy-ion reactions},
author = {Pierroutsakou, D. and Boiano, A. and Di Pietro, M. and Romoli, M. and Martin, B. and Inglima, G. and De Rosa, A. and La Commara, M. and Sandoli, M. and Dip. di Scienze Fisiche, Univ. di Napoli 'Federico II', Naples and Agodi, C. and Alba, R. and Colonna, M. and Coniglione, R. and Del Zoppo, A. and Di Toro, M. and Maiolino, C. and Pellegriti, N. and Piatelli, P. and Santonocito, D. and Sapienza, P. and INFN, Laboratori Nazionali del Sud, Catania},
abstractNote = {We investigated the prompt dipole {gamma}-ray emission, related with entrance channel charge asymmetry effects, in the 40Ar + 92Zr and 36Ar + 96Zr fusion-evaporation reactions at Elab= 15.1 and 16 MeV/nucleon, respectively, with the aim to probe its evolution with incident energy. These reactions populate, through entrance channels having different charge asymmetries, the same compound nucleus at an average excitation energy of 304 MeV with identical spin distribution. It was shown that the dipole {gamma}-ray intensity in the bremsstrahlung subtracted linearized spectra increases by {approx}14% for the more charge asymmetric system. This result, associated with those reported for the 32,36S + 100,96Mo reaction pair at lower beam energies, implies a ''rise and fall'' trend of the prompt dipole {gamma}-ray emission with beam energy with a maximum value at Elab= 9 MeV/nucleon.},
doi = {10.1063/1.2710580},
journal = {AIP Conference Proceedings},
number = 1,
volume = 884,
place = {United States},
year = {Mon Feb 12 00:00:00 EST 2007},
month = {Mon Feb 12 00:00:00 EST 2007}
}