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Title: Nature and decay of a J{pi}=36+ resonance in the 24Mg + 24Mg reaction

Abstract

It has been proposed to associate the narrow ({gamma}=170 keV) and high spin (J{pi}=36+) resonance in the 24Mg + 24Mg reaction at Ec.m= 45.7 MeV with a hyperdeformed molecular state in 48Cr. Such a description has important consequences for the resonance decay into the favoured inelastic channels. Through fragment-{gamma} coincidence measurements performed ON and OFF resonance using the PRISMA-CLARA array, we have established that the 24Mg states selectively populated are the 2+ and 4+ members of the ground state band.

Authors:
; ; ; ; ;  [1]; ;  [2]; ; ; ; ;  [3];  [4]; ; ; ; ; ; more »;  [5] « less
  1. IPHC, Strasbourg (France)
  2. Institute of Nuclear Research, Debrecen (Hungary)
  3. University of Padova, Padova (Italy)
  4. (Italy)
  5. INFN, Laboratori Nazionali di Legnaro (Italy) (and others)
Publication Date:
OSTI Identifier:
20888129
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 853; Journal Issue: 1; Conference: FUSION06: International conference on reaction mechanisms and nuclear structure at the Coulomb barrier, Venice (Italy), 19-23 Mar 2006; Other Information: DOI: 10.1063/1.2338372; (c) 2006 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; CHROMIUM 48; GROUND STATES; KEV RANGE 100-1000; MAGNESIUM 24 BEAMS; MAGNESIUM 24 REACTIONS; MAGNESIUM 24 TARGET; MEV RANGE 10-100; NUCLEAR DECAY; RESONANCE; SPIN; SUPERDEFORMED NUCLEI

Citation Formats

Salsac, M.-D., Haas, F., Courtin, S., Beck, C., Rousseau, M., Zafra, A. Sanchez I., Algora, A., Dombradi, Z., Beghini, S., Farnea, E., Lenzi, S., Montagnoli, G., Scarlassara, F., INFN, Padova, Behera, B. R., Corradi, L., Fioretto, E., Gadea, A., Latina, A., Marginean, N., and Napoli, D. Nature and decay of a J{pi}=36+ resonance in the 24Mg + 24Mg reaction. United States: N. p., 2006. Web. doi:10.1063/1.2338372.
Salsac, M.-D., Haas, F., Courtin, S., Beck, C., Rousseau, M., Zafra, A. Sanchez I., Algora, A., Dombradi, Z., Beghini, S., Farnea, E., Lenzi, S., Montagnoli, G., Scarlassara, F., INFN, Padova, Behera, B. R., Corradi, L., Fioretto, E., Gadea, A., Latina, A., Marginean, N., & Napoli, D. Nature and decay of a J{pi}=36+ resonance in the 24Mg + 24Mg reaction. United States. doi:10.1063/1.2338372.
Salsac, M.-D., Haas, F., Courtin, S., Beck, C., Rousseau, M., Zafra, A. Sanchez I., Algora, A., Dombradi, Z., Beghini, S., Farnea, E., Lenzi, S., Montagnoli, G., Scarlassara, F., INFN, Padova, Behera, B. R., Corradi, L., Fioretto, E., Gadea, A., Latina, A., Marginean, N., and Napoli, D. 2006. "Nature and decay of a J{pi}=36+ resonance in the 24Mg + 24Mg reaction". United States. doi:10.1063/1.2338372.
@article{osti_20888129,
title = {Nature and decay of a J{pi}=36+ resonance in the 24Mg + 24Mg reaction},
author = {Salsac, M.-D. and Haas, F. and Courtin, S. and Beck, C. and Rousseau, M. and Zafra, A. Sanchez I. and Algora, A. and Dombradi, Z. and Beghini, S. and Farnea, E. and Lenzi, S. and Montagnoli, G. and Scarlassara, F. and INFN, Padova and Behera, B. R. and Corradi, L. and Fioretto, E. and Gadea, A. and Latina, A. and Marginean, N. and Napoli, D.},
abstractNote = {It has been proposed to associate the narrow ({gamma}=170 keV) and high spin (J{pi}=36+) resonance in the 24Mg + 24Mg reaction at Ec.m= 45.7 MeV with a hyperdeformed molecular state in 48Cr. Such a description has important consequences for the resonance decay into the favoured inelastic channels. Through fragment-{gamma} coincidence measurements performed ON and OFF resonance using the PRISMA-CLARA array, we have established that the 24Mg states selectively populated are the 2+ and 4+ members of the ground state band.},
doi = {10.1063/1.2338372},
journal = {AIP Conference Proceedings},
number = 1,
volume = 853,
place = {United States},
year = 2006,
month = 8
}
  • The narrow ({gamma}=170 keV) and high spin (J{pi}=36+) resonance in the 24Mg + 24Mg reaction at ECM= 45.7 MeV has been associated with a hyperdeformed molecular state in 48Cr. Such a description has important consequences for the resonance decay into the favored inelastic channels. Through fragment-{gamma} coincidence measurements performed ON and OFF resonance using the PRISMA-CLARA array, we have identified the 24Mg states selectively populated: the 2+ and 4+ members of the ground state band.
  • The {sup 18}Ne({alpha},p){sup 21}Na reaction plays a crucial role in the ({alpha},p) process, which leads to the rapid proton capture process in x-ray bursts. The reaction rate depends upon properties of {sup 22}Mg levels above the {alpha} threshold at 8.14 MeV. Despite recent studies of these levels, only the excitation energies are known for most with no constraints on the spins. We have studied the {sup 24}Mg(p,t){sup 22}Mg reaction at the Oak Ridge National Laboratory (ORNL) Holifield Radioactive Ion Beam Facility (HRIBF), and by measuring the angular distributions of outgoing tritons, we provide some of the first experimental constraints onmore » the spins of astrophysically important {sup 18}Ne({alpha},p){sup 21}Na resonances.« less
  • The level structure of 22Na has been studied at the Holifield Radioactive Ion Beam Facility in Oak Ridge National Laboratory using the 24Mg(p,3He)22Na reaction. 41 and 41.5 MeV proton beams were generated by 25 MV tandem accelerator and bombarded isotopically enriched 24Mg targets. Angular distributions of recoiling 3He particles were extracted by using a segmented annular silicon strip detector array. Spins and parities for ten levels were constrained through a distorted wave Born approximation analysis of angular distributions including three above the proton threshold at 6.739 MeV.
  • The capture {gamma} rays from the 46-keV d-wave and 84-keV p-wave neutron resonances of 24Mg were measured by using a large anti-Compton HPGe {gamma}-ray spectrometer . A neutron time-of-flight method was adopted with a 1.5-ns pulsed neutron source by the 7Li(p,n)7Be reaction. The standard capture cross sections of 197Au were used to determine the incident neutron flux. Twenty-one and twenty-six primary {gamma}-ray transitions were identified for the 46- and 84-keV resonances, respectively. The corresponding capture kernels were derived for both the resonances, and the radiative widths were obtained for the 84-keV broad resonance.