Ground-state alpha-transfer spectroscopic factors of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>sd</mml:mi></mml:math>-shell nuclei

Oelert, W.; Chung, W.; Betigeri, M.G.; Djaloeis, A.; Mayer‐Böricke, C.; Turek, P.

doi:10.1103/physrevc.20.459

Cited by 19 publications

(11 citation statements)

References 16 publications

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“…Previous experimental studies using α-transfer and knock-out reactions have examined α-particle SF's for low-lying states in a handful of nuclei within the sd-shell [39][40][41][42][43], showing significant α-cluster structure in the states observed. In order to represent the possibility of α-clusters states in 34 Ar above the α-threshold, α-SF values were calculated using a cluster-nucleon configuration interaction model [44].…”

Section: B Treatment Of Unknown Spin Assignments and α-Spectroscopicmentioning

confidence: 99%

α -unbound levels in Ar34 from Ar36(p,

Long¹,

Adachi²,

Beard³

et al. 2018

Phys. Rev. C

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The 30 S(α,p) 33 Cl reaction has been identified in several Type-1 X-ray Bursts (XRB) sensitivity studies as a significant reaction within the αp-process, possibly influencing not only the abundances of burst ashes but also the bolometric shape of double-peaked light curves coming from certain XRB systems. Given the dearth of experimental data on the 30 S(α,p) 33 Cl reaction at burst temperatures, we have performed high energy-resolution forward-angle 36 Ar(p,t) 34 Ar measurements in order to identify levels in 34 Ar that could appear as resonances in the 30 S(α,p) 33 Cl reaction. Energies of levels identified in this work, along with model-based assumptions for spin assingments and spectroscopic factors, were then used to determine a rate for the 30 S(α,p) 33 Cl reaction based on a narrow-resonance formalism. The rates determined in this work are then compared with two standard Hauser-Feshbach model prediction over a range of XRB temperatures.

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Section: B Treatment Of Unknown Spin Assignments and α-Spectroscopicmentioning

confidence: 99%

α -unbound levels in Ar34 from Ar36(p,

Long¹,

Adachi²,

Beard³

et al. 2018

Phys. Rev. C

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“…[59][60][61][62]. Some representative results for α-particle SFs for ground state to ground state transitions from previous experimental and theoretical works are shown in Tab.…”

Section: Applications α-Clustering In Sd-shell Nucleimentioning

confidence: 99%

Nuclear clustering using a modern shell model approach

Volya

Tchuvil’sky

2015

Phys. Rev. C

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Nuclear clustering, alpha decays, and multi-particle correlations are important components of nuclear dynamics. In this work we put forward the Cluster-Nucleon Configuration Interaction Model. We use the modern configuration-interaction approach with advanced realistic shell-model Hamiltonians in order to study clustering phenomena; the study is facilitated by the algebraic properties of many-nucleon configurations in the harmonic oscillator basis.Using translationally invariant formalism we built cluster channels that satisfy Pauli exclusion principle as well as orthogonality and normalization conditions. We formally justify the formalism and demonstrate that, within the new method, clustering strengths satisfy sum rules that are consistent with the statistical properties of nuclear reactions with composite particles. Using properly renormalized cluster form factors our approach appears to resolve long-standing problems related to absolute normalization of the alpha clustering spectroscopic factors and their behavior in sd-shell nuclei.Our methods are demonstrated in studies of α spectroscopic factors in sd-shell nuclei and in 16 O treated in p-sd shells. Comparison with experimental data supports validity of the approach.

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“…A static a-nucleus optical potential, such as Igo's potential [24] superposed on the Coulomb barrier, was used in the formalisms developed by Rasmussen and other authors [22,23,37]. It was, however, soon pointed out [25] that since the particle-nucleus interaction is momentum-dependent, as has been known for a long time (see [26]), and is now well-established from scattering experiments (see, for example, [27][28][29][30][31][32]), then the consequent non-locality of the a-nucleus potential should be taken into account in treating a-decay problems also. Of course, if non-local effects on barrier penetration are not negligible, it should be possible in this way to explain the observed 0153-decay characteristics, particularly for large 1, which are not otherwise explicable.…”

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confidence: 99%

Effect of non-local barrier and relative intensities of alpha-spectra in rare-earth nuclei

Chaudhury

Sen

1981

J. Phys. France

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2014 La méthode pour calculer les taux de décroissance 03B1 en prenant pour barrière le potentiel coulombien et un potentiel non local alpha-noyau avec terme d'échange est appliquée aux isotopes 149,151Tb, 149Tbm et 153Dy. Ce calcul montre que l'intensité relative mesurée, 03BB1/03BB0, peut en grande partie être reproduite par les rapports des pénétrabilités, ce qui permet de calculer les largeurs partielles 03B421. Des calculs similaires utilisant un potentiel alpha-noyau statique donnent 03B42l ~ 03B420, en contradiction avec l'analyse des amplitudes spectroscopiques qui donne 03B421 > 03B420. Il est remarquable que cette méthode corrige dans une large mesure ce désaccord, donnant un rapport 03B421/03B420 de l'ordre de 1,1 à 2,2. On peut en conclure que les valeurs de 03B421 obtenues avec un potentiel statique sont trop faibles et que celles données dans le tableau II peuvent être utilisées, dans des limites raisonnables, pour des études de structure nucléaire. Abstract. 2014 The method of calculating alpha-decay intensities taking the barrier to be the usual Coulomb potential superposed by a non-local alpha-nucleus potential with exchange term is applied here to the fine structures of the rare-earth isotopes 149,151Tb, 149Tbm and 153 Dy. The present calculations consistently show that the measured relative intensities, 03BB1/03BB0, are largely accounted for in terms of the non-local penetrability ratios and hence the values of the reduced widths 03B421, are calculated. Similar calculations using static alpha-nucleus potential give 03B421 ~ 03B420 which is contrary to the finding, viz., 03B421 > 03B420 obtained from other sources, for example, from the studies of alpha-spectroscopic amplitudes. It is remarkable that the present method largely makes up this discrepancy giving 03B421/03B420 in the range of 1.1 to 2.2, and it is concluded that the values of 03B421 from static potential are too low and those given in table II are within reasonable limits for use in studying nuclear structures.

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Ground-state alpha-transfer spectroscopic factors ofsd-shell nuclei

Cited by 19 publications

References 16 publications

α -unbound levels in Ar34 from Ar36(p,

α -unbound levels in Ar34 from Ar36(p,

Nuclear clustering using a modern shell model approach

Effect of non-local barrier and relative intensities of alpha-spectra in rare-earth nuclei

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