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Title: Studies of the Single Particle Structure of Exotic Nuclei using Transfer Reactions

Abstract

The TIARA+VAMOS+EXOGAM set-up has recently been installed at GANIL to study the single-particle structure of exotic nuclei. The unique characteristics of the TIARA array, combined with the large acceptance spectrometer VAMOS and the high efficiency Germanium detector array EXOGAM, has allowed high-resolution measurements of transfer reactions in inverse kinematics using low intensity exotic beams. We will describe the experimental set-up, data analysis and preliminary results of the first experiments using a 24Ne beam from SPIRAL, concentrating in particular on the performance of VAMOS that has been used to detect the heavy fragments after the (d,p) (d,d) and (d,t) reactions.

Authors:
;  [1]; ; ;  [2]; ; ; ; ;  [3]; ; ; ; ; ;  [4]; ; ;  [5];  [6]
  1. Department of Physics, University of Liverpool, Liverpool L69 7ZE (United Kingdom)
  2. CCLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD (United Kingdom)
  3. Department of Physics, University of Surrey, Surrey GU2 7XH (United Kingdom)
  4. The Institute of Physical Research, University of Paisley, Paisley, PAI 2BE (United Kingdom)
  5. School of Physics and Astronomy, University of Birmingham, B15 2TT (United Kingdom)
  6. IFIC, CSIC-Universidad de Valencia, E-46071 Valencia (Spain) (and others)
Publication Date:
OSTI Identifier:
20798560
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 831; Journal Issue: 1; Conference: International conference on frontiers in nuclear structure, astrophysics, and reactions - FINUSTAR, Isle of Kos (Greece), 12-17 Sep 2005; Other Information: DOI: 10.1063/1.2200951; (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; DATA ANALYSIS; DEUTERON REACTIONS; DEUTERONS; GANIL CYCLOTRON; GE SEMICONDUCTOR DETECTORS; NEON 24; NUCLEAR STRUCTURE; PERFORMANCE; RESOLUTION; SINGLE-PARTICLE MODEL; SPECTROMETERS; TRANSFER REACTIONS; TRITONS

Citation Formats

Fernandez-Dominguez, B., Chartier, M., Lemmon, R. C., Pucknell, V. P. E., Warner, D. D., Timis, C., Catford, W. N., Baldwin, T. D., Gelletly, W., Pain, S. D., Labiche, M., Amzal, N., Burns, M., Chapman, R., Liang, X., Spohr, K., Ashwood, N., Curtis, N., Freer, M., and Caballero, L.. Studies of the Single Particle Structure of Exotic Nuclei using Transfer Reactions. United States: N. p., 2006. Web. doi:10.1063/1.2200951.
Fernandez-Dominguez, B., Chartier, M., Lemmon, R. C., Pucknell, V. P. E., Warner, D. D., Timis, C., Catford, W. N., Baldwin, T. D., Gelletly, W., Pain, S. D., Labiche, M., Amzal, N., Burns, M., Chapman, R., Liang, X., Spohr, K., Ashwood, N., Curtis, N., Freer, M., & Caballero, L.. Studies of the Single Particle Structure of Exotic Nuclei using Transfer Reactions. United States. doi:10.1063/1.2200951.
Fernandez-Dominguez, B., Chartier, M., Lemmon, R. C., Pucknell, V. P. E., Warner, D. D., Timis, C., Catford, W. N., Baldwin, T. D., Gelletly, W., Pain, S. D., Labiche, M., Amzal, N., Burns, M., Chapman, R., Liang, X., Spohr, K., Ashwood, N., Curtis, N., Freer, M., and Caballero, L.. Wed . "Studies of the Single Particle Structure of Exotic Nuclei using Transfer Reactions". United States. doi:10.1063/1.2200951.
@article{osti_20798560,
title = {Studies of the Single Particle Structure of Exotic Nuclei using Transfer Reactions},
author = {Fernandez-Dominguez, B. and Chartier, M. and Lemmon, R. C. and Pucknell, V. P. E. and Warner, D. D. and Timis, C. and Catford, W. N. and Baldwin, T. D. and Gelletly, W. and Pain, S. D. and Labiche, M. and Amzal, N. and Burns, M. and Chapman, R. and Liang, X. and Spohr, K. and Ashwood, N. and Curtis, N. and Freer, M. and Caballero, L.},
abstractNote = {The TIARA+VAMOS+EXOGAM set-up has recently been installed at GANIL to study the single-particle structure of exotic nuclei. The unique characteristics of the TIARA array, combined with the large acceptance spectrometer VAMOS and the high efficiency Germanium detector array EXOGAM, has allowed high-resolution measurements of transfer reactions in inverse kinematics using low intensity exotic beams. We will describe the experimental set-up, data analysis and preliminary results of the first experiments using a 24Ne beam from SPIRAL, concentrating in particular on the performance of VAMOS that has been used to detect the heavy fragments after the (d,p) (d,d) and (d,t) reactions.},
doi = {10.1063/1.2200951},
journal = {AIP Conference Proceedings},
number = 1,
volume = 831,
place = {United States},
year = {Wed Apr 26 00:00:00 EDT 2006},
month = {Wed Apr 26 00:00:00 EDT 2006}
}
  • We have developed a new experimental setup based at the GANIL/SPIRAL facility in Caen, France to measure one-nucleon transfer reactions in inverse kinematics in order to study the evolution of the single particle structure of exotic nuclei. The setup couples together three state-of-the-art detection systems: the TIARA Si array, the large-acceptance magnetic spectrometer VAMOS and the high-efficiency segmented Ge {gamma}-ray array EXOGAM. In a first experiment, the 24Ne(d,p)25Ne reaction has been studied to probe the N=16 shell closure. Details of the setup, data analysis and preliminary results are presented.
  • Neutron transfer reactions were performed in inverse kinematics using radioactive ion beams of {sup 132}Sn, {sup 130}Sn, and {sup 134}Te and deuterated polyethylene targets. Preliminary results are presented. The Q-value spectra for {sup 133}Sn, {sup 131}Sn and {sup 135}Te reveal a number of previously unobserved peaks. The angular distributions are compatible with the expected lf{sub 7/2} nature of the ground state of {sup 133}Sn, and 2p{sub 3/2} for the 3.4 MeV state in {sup 131}Sn.
  • Single-neutron transfer with the (d,p) reaction in inverse kinematics has been used to study the properties of the light nuclei 9Li and 7He. The results for 9Li and 7He are compared to the predictions of ab-initio models of nuclear structure. Different possibilities for excited states in 7He are discussed in the context of other recent experimental studies of 7He.
  • The amplitude for the consecutive transfer of two protons in A(X, Y)B peripheral nuclear reactions induced by loosely bound light (exotic) nuclei and described by a nonrelativistic square Feynman diagram in which the first transferred proton is loosely bound while the second one in tightly bound is considered. It is shown that the inclusion of three-ray Coulomb vertex effects in the square diagram leads to the appearance of an additional 'Coulomb' singularity in the variable cos {theta} (here, {theta} is the c.m. scattering angle), this singularity being closer to the physical domain, -1 {<=} cos {theta} {<=} 1, than themore » well-known 'triangle' singularities corresponding to the amplitude of the square diagram in which the internal line is contracted. The asymptotic behavior of the partial-wave amplitudes for l >> 1 that are generated by the aforementioned singularities is found explicitly. A comparative analysis of the resulting partial-wave amplitudes for l >> 1 is performed for specific peripheral nuclear reactions induced by {sup 8}B and {sup 12}N ions at various energies.« less