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Title: Measurement of a complete set of analyzing powers and cross section of the kinematically complete breakup reaction sup 4 He( rvec d , p. alpha. ) n at 7. 0 MeV and the isospin-forbidden d sup *

Abstract

The breakup reaction {sup 4}He({ital {rvec d}},{ital p}{alpha}){ital n} at {ital E}{sub {ital d}}=7.0 MeV has been investigated in a kinematically complete experiment with vector and tensor polarized deuterons in a kinematical situation with zero relative energy of the two outgoing nucleons, a preferred situation to show effects from the singlet deuteron {ital d}{sup *} and therefore isospin breaking. A complete set of analyzing powers, {ital A}{sub {ital y}}, {ital A}{sub {ital y}{ital y}}, {ital A}{sub {ital x}{ital z}}, and {ital A}{sub {ital z}{ital z}} in addition to the differential breakup cross section, {ital d}{sup 3}{sigma}/{ital d}{Omega}{sub 3}{ital d}{Omega}{sub 4}{ital dS} has been measured. The data are compared to new Faddeev calculations including an approximate (cutoff) Coulomb potential allowing for the {ital d}{sup *} production and also {ital D}-wave {alpha}-{ital N} interactions. Good agreement is found for the polarization observables and the shape of the cross section which, however, disagrees in absolute magnitude. Both the inclusion of the {ital d}{sup *} and of {ital D} waves seem necessary for a good description of all data and for the interpretation of a small excursion in some observables in the {ital n}-{ital p} final-state interaction region as a manifestation of the isospin-forbiddenmore » {ital d}{sup *}.« less

Authors:
; ; ; ; ; ;  [1];  [2]
  1. Institut fuer Kernphysik, Universitaet Koeln, D-5000 Koeln 41 (Germany)
  2. Central Research Institute for Physics, H-1525, Budapest 114 (Hungary)
Publication Date:
OSTI Identifier:
7035095
Resource Type:
Journal Article
Journal Name:
Physical Review, C (Nuclear Physics); (United States)
Additional Journal Information:
Journal Volume: 45:6; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; DEUTERON REACTIONS; BREAKUP REACTIONS; HELIUM 4 TARGET; ANALYZING POWER; DIFFERENTIAL CROSS SECTIONS; EXPERIMENTAL DATA; ISOSPIN; MEV RANGE 01-10; NEUTRONS; PARTIAL WAVES; POLARIZED BEAMS; PROTONS; BARYONS; BEAMS; CHARGED-PARTICLE REACTIONS; CROSS SECTIONS; DATA; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; HADRONS; INFORMATION; MEV RANGE; NUCLEAR REACTIONS; NUCLEONS; NUMERICAL DATA; PARTICLE PROPERTIES; TARGETS; 663440* - D-, T-, & He-induced Reactions & Scattering- (1992-); 663510 - Nuclear Mass Ranges- A=1-5- (1992-)

Citation Formats

Niessen, P, Lemaitre, S, Nyga, K R, Rauprich, G, Reckenfelderbaeumer, R, Sydow, L, Paetz gen Schieck, H, and Doleschall, P. Measurement of a complete set of analyzing powers and cross section of the kinematically complete breakup reaction sup 4 He( rvec d , p. alpha. ) n at 7. 0 MeV and the isospin-forbidden d sup *. United States: N. p., 1992. Web. doi:10.1103/PhysRevC.45.2570.
Niessen, P, Lemaitre, S, Nyga, K R, Rauprich, G, Reckenfelderbaeumer, R, Sydow, L, Paetz gen Schieck, H, & Doleschall, P. Measurement of a complete set of analyzing powers and cross section of the kinematically complete breakup reaction sup 4 He( rvec d , p. alpha. ) n at 7. 0 MeV and the isospin-forbidden d sup *. United States. doi:10.1103/PhysRevC.45.2570.
Niessen, P, Lemaitre, S, Nyga, K R, Rauprich, G, Reckenfelderbaeumer, R, Sydow, L, Paetz gen Schieck, H, and Doleschall, P. Mon . "Measurement of a complete set of analyzing powers and cross section of the kinematically complete breakup reaction sup 4 He( rvec d , p. alpha. ) n at 7. 0 MeV and the isospin-forbidden d sup *". United States. doi:10.1103/PhysRevC.45.2570.
@article{osti_7035095,
title = {Measurement of a complete set of analyzing powers and cross section of the kinematically complete breakup reaction sup 4 He( rvec d , p. alpha. ) n at 7. 0 MeV and the isospin-forbidden d sup *},
author = {Niessen, P and Lemaitre, S and Nyga, K R and Rauprich, G and Reckenfelderbaeumer, R and Sydow, L and Paetz gen Schieck, H and Doleschall, P},
abstractNote = {The breakup reaction {sup 4}He({ital {rvec d}},{ital p}{alpha}){ital n} at {ital E}{sub {ital d}}=7.0 MeV has been investigated in a kinematically complete experiment with vector and tensor polarized deuterons in a kinematical situation with zero relative energy of the two outgoing nucleons, a preferred situation to show effects from the singlet deuteron {ital d}{sup *} and therefore isospin breaking. A complete set of analyzing powers, {ital A}{sub {ital y}}, {ital A}{sub {ital y}{ital y}}, {ital A}{sub {ital x}{ital z}}, and {ital A}{sub {ital z}{ital z}} in addition to the differential breakup cross section, {ital d}{sup 3}{sigma}/{ital d}{Omega}{sub 3}{ital d}{Omega}{sub 4}{ital dS} has been measured. The data are compared to new Faddeev calculations including an approximate (cutoff) Coulomb potential allowing for the {ital d}{sup *} production and also {ital D}-wave {alpha}-{ital N} interactions. Good agreement is found for the polarization observables and the shape of the cross section which, however, disagrees in absolute magnitude. Both the inclusion of the {ital d}{sup *} and of {ital D} waves seem necessary for a good description of all data and for the interpretation of a small excursion in some observables in the {ital n}-{ital p} final-state interaction region as a manifestation of the isospin-forbidden {ital d}{sup *}.},
doi = {10.1103/PhysRevC.45.2570},
journal = {Physical Review, C (Nuclear Physics); (United States)},
issn = {0556-2813},
number = ,
volume = 45:6,
place = {United States},
year = {1992},
month = {6}
}