How to extract isoscalar transition rates from alpha particle scattering experiments

Rebel, H.

doi:10.1007/bf01547499

Cited by 28 publications

(12 citation statements)

References 11 publications

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“…The good agreement of the results of the measurements reported in this paper should be noted. Areanalysis of the former a-particle scattering data on the basis of a theorem relating the moments of the interaction potential to the moments of the dens'ity distribution (Satchler 1972a, Rebel 1976) yields ·nearly the same result.…”

Section: Inelastic A-particle Scatteringmentioning

confidence: 74%

“…In these cases from previous investigations (Morinaga and Takahashi 1959, Crannel et al 1961, Rebel et al 1972a, Baker,and Tickle 1972, Pitthan 1973) enhanced hexadecapole transitions are expected to be possibly observable in the direct electromagnetic decay of the 4t states. In addition to the electromagnetic studies and supplementing previous results Rebel 1975b, Rebel 1976)we investigated also the excitation of the 4t states by inelastic scattering of 104 MeV a-particles and extracted the isoscalar L=4 transition rates by procedures which are extensively described elsewhere (Rebel 1976). Comparing the results of the different methods the main aspect is given by the question of consistency of the results.…”

Section: Experimentelle Studien Der Hexadekapol-bewegung In Sphärischmentioning

confidence: 94%

“…In particular, inelastic a-particle scattering in the 100 MeV region (Tamura 1965, Rebel et al 1972a, Rebel et al 1972 is extremely sensitive to magnitude and phase of L=4 transition amplitudes. Recently, improved and nearly model independent procedures have been worked out (Rebel 1976) for extracting reliable values of the transition rates from a-particle scattering. Some deficiencies of previous procedures (Bernstein 1969) have been removed, by which the rates, in particular of higher multipolarities, had generally been underestimated.…”

Section: Experimentelle Studien Der Hexadekapol-bewegung In Sphärischmentioning

confidence: 99%

“…A. The measured 60Ni (a,a The basis of the analysis more extensively described by Rebel( 1976) is briefly sketched'for the case of 60Ni in the following: The density distribution of the 60Ni nucleus has been parametrized by a Fermi distribution with two parameters (halfway radius c and diffuseness a) adopted from electron scattering results (de Jager et al 1974)…”

Section: Inelastic A-particle Scatteringmentioning

confidence: 99%

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Experimental studies of hexadecapole motion in spherical nuclei

Faust

Hanser

Klewe‐Nebenius

et al. 1978

J. Phys. G: Nucl. Phys.

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The 0+ + 41 hexadecapole transitions in 60Ni and 140Ce have experimentally been investigated by means of a-particle scattering as well as by , , + spectroscopy of the electromagnetic decay of the 4 1 states. In the case of 60Ni an upper limitof 1 x 10-7 was found for the branching of the , , , + ' E4 and E2 cascade decay of the 4 1 state by conversion electron spectroscopy. It corresponds toan enhancement factor G 4 < 9.0 s.p:u., while the a-particle scattering measurement~result in G 4 = (5.5 ± 0.8) s.p.u~.In 140Ce the 4t + 0+cross-over y-decay has been observed with an enhancement of G 4 = (11.8~0.7) s.p.u. in very good agreement with the value G 4 = (13 ± 2) s.p.u. from the a-particle scattering experiments. The eValuation of the a-particie scattering cross sections isbased on a spec~fic reaction mo~el (folding model). The , ' + + ' , . , , experimental results from the direct (4 1 + 0 ) decay are considered to be an empirical test of model dependenceof the procedures extracting L = 4 transition rates from a-particle scattering. Compiling several similar results the consistency of the method~appliedas well as the evidence and some implications of hexadecapole motion in spherical nuclei are briefly discus~ed. EXPERIMENTELLE STUDIEN DER HEXADEKAPOL-BEWEGUNG IN SPHÄRISCHEN KERNEN ZUSAMMENFASSUNG:Die 0+ + 4~Hexadekapol-übergänge in 60Ni und 140Ce wurden experimentell sowohl durch a-Teilchenstreuung als auch durch Beobachtung des elektromagnetischen Zerfalls der 4~-Zustände untersucht. Im Falle von 60Ni wurde mittels Konversionselektronenspektroskopie eine obere Grenze von 1 x 10-7 für das Verzweigungsverhältnis von E4-und E2-(Kaskaden)-Zerfqll gefunden. Dies entspricht einem L=4 IIEnhancement ll G 4 < 9.0 s.p.u., während man aus den a-Teilchen-Streuexperimenten den Wert G 4 =(5.5 ± 0.8)s.p.u. gewinnt. In 140Ce konnte der 4~+ 0+ y-Obergang mit einer kollektiven Verstärkung von G4 =(11.8~0.7)s.p.u. beobachtet werden, in sehr guter übereinstimmung mit dem Wert G 4 = (13~,2) s.p.u. aus der a-Teilchenstreuung. Die Auswertung der Wirkungsquerschnitte für die a-Teilchenstreuung basiert auf einem speziellen Reaktionsmodell (Faltungsmodell). Die Resultate der direkten experimentellen Beobachtung des 4~+ 0+ Zerfalls sind ein empirischer Test auf die Modellabhängigkeit der Verfahren, mit denen L=4übergangsraten aus der a-Teilchenstreuung gewonnen werden. Zusammen mit einigen anderen ähnlichen Ergebnissen werden die Konsistenz der Methoden sowie die Evidenz und einige Implikationen der Hexadekapol-Bewegung in sphärischen Kernen kurz diskutiert.

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Section: Inelastic A-particle Scatteringmentioning

confidence: 74%

Section: Experimentelle Studien Der Hexadekapol-bewegung In Sphärischmentioning

confidence: 94%

Section: Experimentelle Studien Der Hexadekapol-bewegung In Sphärischmentioning

confidence: 99%

Section: Inelastic A-particle Scatteringmentioning

confidence: 99%

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Experimental studies of hexadecapole motion in spherical nuclei

Faust

Hanser

Klewe‐Nebenius

et al. 1978

J. Phys. G: Nucl. Phys.

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“…One of the more general results of recent elastic alpha-particle scattering investigations shows that the overall radial shape of the real part of the alphaParticle scattering optical is significantly better represented by a squared Saxon-Woods-form (SW2) rather than by the standard Saxon-Woods (SW) parametrization [7,8]. These phenomenological findings can be justified by the folding model ap-* Institute for Physics and Nuclear Engineering, Bucharest, Romania proach [9] generating the real part of the optical potential by a convolution of the nuclear matter distribution and an effective alpha-particle-bound nucleon interaction. The question, however, whether the phenomenological squared Saxon-Woods form has to be extended also to the shape of (permanently or dynamically) deformed optical potentials is not sufficiently investigated (see e.g.…”

Section: Introductionmentioning

confidence: 93%

104 MeV alpha particle scattering from90, 92Zr

Corcalciuc

Gils²,

Rebel³

et al. 1982

Z Physik A

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Differential cross sections have been measured for the elastic and inelastic scattering of 104 MeV alpha-particles from 9o, 92Zr" The experimental data are analyzed in terms of coupled channels on the basis of a flexible anharmonic vibrator model and using different parametrizations of the radial shape of the extended optical potential. The results favour the squared Saxon-Woods type for the real part. Additionally to a radial momentum analysis of the real potentials a semimicroscopic folding model has been applied for extracting isoscalar quadrupole and hexadecapole transition rates.

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Excitation and decay of giant resonances

Wagner

Nuclear Interactions

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How to extract isoscalar transition rates from alpha particle scattering experiments

Cited by 28 publications

References 11 publications

Experimental studies of hexadecapole motion in spherical nuclei

Experimental studies of hexadecapole motion in spherical nuclei

104 MeV alpha particle scattering from90, 92Zr

Excitation and decay of giant resonances

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