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Title: Spin polarization of {sup 34}Al fragments produced by nucleon pickup at intermediate energies

Abstract

The polarization of {sup 34}Al fragments, produced by single neutron pickup from a {sup 9}Be target by a {sup 36}S projectile at 77.5 MeV/nucleon, have been observed at GANIL via the detection of resonantly destroyed {beta}-asymmetry. The reaction-induced polarization is deduced using a tentative spin/parity assignment for the {sup 34}Al ground state. A positive polarization was measured near the peak of the {sup 34}Al yield curve. A kinematical model based on the spectator-participant model for projectile fragmentation reactions has been extended in order to take into account the features of pickup reactions, i.e., the picked-up nucleon having an average momentum equal to the Fermi momentum and aligned along the incident beam direction. The trend-line in the observed spin-orientation is very well reproduced by this model.

Authors:
; ; ; ; ; ;  [1];  [2]; ;  [3]; ; ; ;  [4];  [5]
  1. Instituut voor Kern-en Stralingsfysica, K. U. Leuven, B-3001 Leuven (Belgium)
  2. Dipartimento di Fisica, Universita di Camerino, I-62032 Camerino (Italy)
  3. CEA/DIF/DPTA/PN, BP 12, F-91680 Bruyeres le Chatel (France)
  4. GANIL, BP 55027, F-14076 Caen Cedex 5 (France)
  5. FLNR-JINR, Department of Physics, RU-141980 Dubna (Russian Federation)
Publication Date:
OSTI Identifier:
20771439
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.73.044313; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALUMINIUM 34; ASYMMETRY; BERYLLIUM 9; GANIL CYCLOTRON; GROUND STATES; HEAVY ION REACTIONS; MEV RANGE; NEUTRONS; NUCLEAR FRAGMENTATION; NUCLEAR REACTION YIELD; PARITY; PICKUP REACTIONS; POLARIZATION; SCATTERING; SPIN; SPIN ORIENTATION

Citation Formats

Turzo, K., Himpe, P., Borremans, D., Mallion, S., Neyens, G., Vermeulen, N., Yordanov, D., Balabanski, D.L., Belier, G., Daugas, J.M., Georgiev, G., Oliveira de Santos, F., Matea, I., Stodel, Ch., and Penionzhkevich, Yu. E.. Spin polarization of {sup 34}Al fragments produced by nucleon pickup at intermediate energies. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.044313.
Turzo, K., Himpe, P., Borremans, D., Mallion, S., Neyens, G., Vermeulen, N., Yordanov, D., Balabanski, D.L., Belier, G., Daugas, J.M., Georgiev, G., Oliveira de Santos, F., Matea, I., Stodel, Ch., & Penionzhkevich, Yu. E.. Spin polarization of {sup 34}Al fragments produced by nucleon pickup at intermediate energies. United States. doi:10.1103/PhysRevC.73.044313.
Turzo, K., Himpe, P., Borremans, D., Mallion, S., Neyens, G., Vermeulen, N., Yordanov, D., Balabanski, D.L., Belier, G., Daugas, J.M., Georgiev, G., Oliveira de Santos, F., Matea, I., Stodel, Ch., and Penionzhkevich, Yu. E.. Sat . "Spin polarization of {sup 34}Al fragments produced by nucleon pickup at intermediate energies". United States. doi:10.1103/PhysRevC.73.044313.
@article{osti_20771439,
title = {Spin polarization of {sup 34}Al fragments produced by nucleon pickup at intermediate energies},
author = {Turzo, K. and Himpe, P. and Borremans, D. and Mallion, S. and Neyens, G. and Vermeulen, N. and Yordanov, D. and Balabanski, D.L. and Belier, G. and Daugas, J.M. and Georgiev, G. and Oliveira de Santos, F. and Matea, I. and Stodel, Ch. and Penionzhkevich, Yu. E.},
abstractNote = {The polarization of {sup 34}Al fragments, produced by single neutron pickup from a {sup 9}Be target by a {sup 36}S projectile at 77.5 MeV/nucleon, have been observed at GANIL via the detection of resonantly destroyed {beta}-asymmetry. The reaction-induced polarization is deduced using a tentative spin/parity assignment for the {sup 34}Al ground state. A positive polarization was measured near the peak of the {sup 34}Al yield curve. A kinematical model based on the spectator-participant model for projectile fragmentation reactions has been extended in order to take into account the features of pickup reactions, i.e., the picked-up nucleon having an average momentum equal to the Fermi momentum and aligned along the incident beam direction. The trend-line in the observed spin-orientation is very well reproduced by this model.},
doi = {10.1103/PhysRevC.73.044313},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 73,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}