Preliminary Study of Two-Neutron States via the ({sup 18}O,{sup 16}O) Reaction at 84 MeV

Journal Article · Fri Oct 28 04:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3628385· OSTI ID:21612056

Cavallaro, M; Tudisco, S ^[1]; Cappuzzello, F; Carbone, D; Cunsolo, A; Bondi, M; Santagati, G; Taranto, G ^[1]; Foti, A ^[2]; Chen, R ^[1]; Linares, R ^[1]; Azaiez, F; Franchoo, S; Niikura, M; Scarpaci, J A ^[3]

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1. Istituto Nazionale di Fisica Nucleare - Laboratori Nazionali del Sud, Catania (Italy)
2. Dipartimento di Fisica e Astronomia, Universita degli Studi di Catania, Catania (Italy)
3. CNRS-IN2P3, Institut de Physique Nucleaire d'Orsay, Orsay (France)

A study of light neutron-rich nuclei has been performed at the INFN-LNS laboratory in Catania (Italy) by the ({sup 18}O, {sup 16}O) reaction at 84 MeV incident energy on {sup 9}Be, {sup 11}B and {sup 13}C targets. The {sup 16}O ejectiles have been momentum analyzed and detected at forward angles by the MAGNEX magnetic spectrometer. The energy spectra of {sup 15}C show several known low lying states up to about 7 MeV excitation energy and unknown resonant structures at higher excitation energy. The strong excitation of these latter together with the measured width of about 2 MeV FWHM could indicate the presence of collective modes of excitation connected to the transfer of a correlated neutron pair. Also considerations regarding the reaction mechanism and the nuclei involved in the transfer seem to confirm such a conclusion. Similar features characterize the energy spectra of the {sup 11}Be and {sup 13}B nuclei. The achieved mass resolution (about 1/160) guarantying the identification of the reaction products corresponding to different reaction channels has allowed to study the relative yields for the different reaction channels. The measured yields show an enhancement of the two-neutron transfer channel compared to the one-neutron transfer. This result seems to indicate that the ({sup 18}O, {sup 16}O) reaction proceeds mainly by the direct transfer of the neutron pair and that the second order processes are negligible.

• OSTI ID: 21612056
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1377; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BERYLLIUM 9 TARGET
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BORON 11 TARGET
CARBON 13 TARGET
CARBON 15
CARBON ISOTOPES
CHARGE EXCHANGE
ENERGY RANGE
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXCITATION
ISOTOPES
LIGHT NUCLEI
MAGNETIC SPECTROMETERS
MASS RESOLUTION
MEASURING INSTRUMENTS
MEV RANGE
NEUTRON TRANSFER
NEUTRON-RICH ISOTOPES
NUCLEAR STRUCTURE
NUCLEI
OXYGEN 16
OXYGEN ISOTOPES
PARITY
PARTICLE PROPERTIES
RADIOISOTOPES
RESOLUTION
SECONDS LIVING RADIOISOTOPES
SPECTRA
SPECTROMETERS
STABLE ISOTOPES
TARGETS