M1 resonances in unstable magic nuclei

Kamerdzhiev, S. P.; Speth, J.; Tertychny, G.; Wambach, J.

doi:10.1007/bf01292513

Cited by 28 publications

(50 citation statements)

References 19 publications

(27 reference statements)

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“…The authors found that for the 48 Ca M1 resonance, B(M1) = 8.64 µ 2 N , 6.55 µ 2 N , and 6.12 µ 2 N when considering coupling of 1p1h to the continuum, to 2p2h and continuum with RPA-like ground-state correlations, and to the same with additional ground-state correlations, respectively [17,37]. The present result is in agreement with the calculations that include RPA-like correlations as well as coupling to the continuum and 2p2h.…”

Section: Fig 5 (Color Online) (A) the Efficiency For Detecting Neutmentioning

confidence: 99%

Measurements of the48Ca(γ,n)reaction

et al. 2011

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The48 Ca(γ,n) cross section was measured using γ-ray beams of energies between 9.5 and 15.3 MeV generated at the Triangle Universities Nuclear Laboratory (TUNL) high-intensity γ-ray source (HIγS). Prior to this experiment, no direct measurements had been made with γ-ray beams of sufficiently low energy spread to observe structure in this energy range. The cross sections were measured at thirty-four different γ-ray energies with an enriched 48 Ca target. Neutron emission is the dominant decay mechanism in the measured energy range that spans from threshold, across the previously identified M1 strength, and up the low-energy edge of the E1 giant dipole resonance (GDR). This work found B(M 1) = 6.8 ± 0.5 µ 2 N for the 10.23 MeV resonance, a value greater than previously measured. Structures in the cross section commensurate with extended random-phase approximation (ERPA) calculations have also been observed whose magnitudes are in agreement with existing data.

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Section: Fig 5 (Color Online) (A) the Efficiency For Detecting Neutmentioning

confidence: 99%

Measurements of the48Ca(γ,n)reaction

et al. 2011

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“…Standard Skyrme Hartree-Fock and Woods-Saxon potential models, whose parameters are determined from the properties of nuclei near the valley of stability, predict the Og7/2 orbital to be less bound than the 1d5/2 orbital by 0.5 to 2.0 MeV [13]. Levels [14]. )…”

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confidence: 99%

Gamow-Teller strength in the region ofSn100

Brown

Rykaczewski

1994

Phys. Rev. C

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New calculations are presented for Gamow-Teller beta decay of nuclei near 'Sn. Essentially all of the Sn Gamow-Teller decay strength is predicted to go to a single state at an excitation energy of 1.8 MeV inIn. The first calculations are presented for the decays of neighboring odd-even and odd-odd nuclei which show, in contrast to ' Sn, surprisingly complex and broad Gamow-Teller strength distributions. The results are compared to existing experimental data and the resulting hindrance factors are discussed.PACS number(s): 21.10. Pc, 21.60.Cs, 23.40.Hc, 27.60.+j One of the primary new directions in nuclear spectroscopy is in the experimental study and theoretical understanding of nuclei near the limits of particle stability. The heaviest nucleus with an equal number of protons and neutrons predicted to be stable is Sn, and experiments are being planned and carried out at several laboratories to produce and study the decay of this nucleus [1] and others [2,3] in this mass . "egion. One of the most interesting aspects of these proton-rich nuclei is that most of the giant Gamow-Teller resonance lies within the beta-decay Q-value window. We report here on new calculations which show some of the unusual features which one may expect to see in these decays, the special problems associated with their experimental detection and the important nuclear structure information that will be obtained.Our model space, which is similar to that of a number of other calculations [4 -7], is designed for nuclei with Z~50 and ¹~50and starts from a closed-shell configuration for

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“…One of the few exceptions is Ref. [53]. Here magnetic dipole states were investigated and in this case, as expected, ground-state correlations beyond RPA give rise to a reduction of the strength.…”

Section: Transition Probabilities B(el) Of the Low-lying Collectivmentioning

confidence: 67%

Optimizing phonon space in the phonon-coupling model

et al. 2017

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We present a new scheme to select the most relevant phonons in the phonon-coupling model, named here time-blocking approximation (TBA). The new criterion, based on the phonon-nucleon coupling strengths rather than on B(EL) values, is more selective and thus produces much smaller phonon spaces in TBA. This is beneficial in two respects: first, it curbs down the computational cost, and second, it reduces the danger of double counting in the expansion basis of TBA. We use here TBA in a form where the coupling strength is regularized to keep the given Hartree-Fock ground state stable. The scheme is implemented in an RPA and TBA code based on the Skyrme energy functional. We first explore carefully the cutoff dependence with the new criterion and can work out a natural (optimal) cutoff parameter. Then we use the freshly developed and tested scheme to a survey of giant resonances and low-lying collective states in six doubly magic nuclei looking also on the dependence of the results when varying the Skyrme parametrization.

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M1 resonances in unstable magic nuclei

Cited by 28 publications

References 19 publications

Measurements of the48Ca(γ,n)reaction

Measurements of the48Ca(γ,n)reaction

Gamow-Teller strength in the region ofSn100

Optimizing phonon space in the phonon-coupling model

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