Levels in 47Ca and 41Ca populated in thermal neutron capture

Cranston, Frederick P.; Birkett, R.E.; White, D.H.; Hughes, J.A.

doi:10.1016/0375-9474(70)90780-3

Cited by 23 publications

(42 citation statements)

References 22 publications

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“…4, the K and Ca neutron-shell gap energies are compared with shell gap energies obtained from the K and Ca mass excesses in AME'03. The 49,50 Ca mass excesses have been measured and evaluated previously with good accuracies [34,35], and as a consequence, our Ca measurements do not lead to a significant improvement of the Ca S 2n and ∆ n values with respect to those calculated from the mass excesses in AME'03. However, the K S 2n and ∆ n values calculated with our measured mass excesses are significantly different.…”

Section: B Separation and Shell Gap Energiesmentioning

confidence: 63%

Penning-trap mass measurements of the neutron-rich K and Ca isotopes: Resurgence of theN=28shell strength

et al. 2012

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We present Penning-trap mass measurements of neutron-rich 44,47−50 K and 49,50 Ca isotopes carried out at the TITAN facility at TRIUMF-ISAC. The 44 K mass measurement was performed with a charge-bred 4+ ion utilizing the TITAN EBIT, and agrees with the literature. The mass excesses obtained for 47 K and 49,50 Ca are more precise and agree with the values published in the 2003 Atomic Mass Evaluation (AME'03). The 48,49,50 K mass excesses are more precise than the AME'03 values by more than one order of magnitude. For 48,49 K, we find deviations by 7σ and 10σ, respectively. The new 49 K mass excess lowers significantly the two-neutron separation energy at the neutron number N = 30 compared with the separation energy calculated from the AME'03 massexcess values, and thus, increases the N = 28 neutron-shell gap energy at Z = 19 by approximately 1 MeV.

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Section: B Separation and Shell Gap Energiesmentioning

confidence: 63%

Penning-trap mass measurements of the neutron-rich K and Ca isotopes: Resurgence of theN=28shell strength

et al. 2012

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“…The latter were obtained by considering all the possible combinations of γ rays decaying directly from the neutron-capture level. The S n values obtained in this work are presented in Tab II, along with those ones reported in the literature [46][47][48][49][50][51]. The γ-ray intensities and branching ratios for each level were evaluated using γ-γ matrices, constructed considering all HPGe detectors in the array.…”

Section: Discussionmentioning

confidence: 99%

“…The good energy resolution and efficiency of the HPGe array turned out to be essential to observe, with high accuracy, very weak γ-ray decay paths, whereas the BGO Compton shields significantly suppressed γ-ray coincidences with Compton-scattered radiation. The level schemes and the γ-ray decays of the 41 Ca, 47 Ca, and 49 Ca nuclei were studied by using γ-γ and tripleγ coincidence techniques. At first, very selective gates on primary, high-energy γ transitions were used to identify secondary γ-ray cascades and to locate new low-lying states.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, a comprehensive investigation of these mechanisms, moving along the Ca isotopic chain, may significantly advance our understanding of the emergence of complex phenomena, such as the quenching of spectroscopic factors and the anarmonicity of vibrational spectra in this mass region. In this paper, we present new experimental results in 41 Ca, 47 Ca, and 49 Ca, populated via cold neutroncapture reactions and studied by γ-ray spectroscopy. Neutron-capture reactions induced by cold and thermal neutrons populate the corresponding N+1 systems at the neutron separation energy S n .…”

Section: Introductionmentioning

confidence: 99%

“…HPGe crystals) enables to perform an almost-complete γ-ray spectroscopy from the neutron binding energy to the ground state, providing an exhaustive picture of the low-spin structure of the nuclei of interest. The present experimental results on the 41 Ca, 47 Ca, and 49 Ca nuclei will be discussed in the framework of the Hybrid Configuration Mixing Model [35,36], with particular attention to the interplay between singleparticle/hole states and couplings with core excitations. The paper is organized as follows: in Sec.…”

Section: Introductionmentioning

confidence: 99%

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Low-spin particle/hole-core excitations in $^{41,47,49}$Ca isotopes studied by cold-neutron capture reactions

Bottoni,

Cieplicka-Oryńczak,

Leoni

et al. 2020

Preprint

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We present recent results on the structure of the one-valence-particle 41 Ca and 49 Ca, and onevalence-hole 47 Ca, nuclei. The isotopes of interest were populated via the cold-neutron capture reactions 40 Ca(n,γ), 48 Ca(n,γ) and 46 Ca(n,γ), respectively. The experiments were performed at the Institut Laue-Langevin, within the EXILL campaign, which employed a large array of HPGe detectors. The γ decay and level schemes of these nuclei were investigated by γ-ray coincidence relationships, leading to the identification of 41, 10, and 6 new transitions in 41 Ca, 47 Ca, and 49 Ca, respectively. Branching ratios and intensities were extracted for the γ decay from each state, and γ-ray angular correlations were performed to establish a number of transition multipolarities and mixing ratios, thus helping in the spin assignment of the states. The experimental findings are discussed along with microscopic, self-consistent beyond-mean-field calculations performed with the Hybrid Configuration Mixing model, based on a Skyrme SkX Hamiltonian. The latter suggests that a fraction of the low-spin states of the 41 Ca, 49 Ca, and 47 Ca nuclei is characterized by the coexistence of either 2p-1h and 1p-2h excitations, or couplings between single-particle/hole degrees of freedom and collective vibrations (phonons) of the doubly-magic "core".

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Nuclear data sheets for A = 49

Halbert

1978

Nuclear Data Sheets

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Levels in 47Ca and 41Ca populated in thermal neutron capture

Cited by 23 publications

References 22 publications

Penning-trap mass measurements of the neutron-rich K and Ca isotopes: Resurgence of theN=28shell strength

Penning-trap mass measurements of the neutron-rich K and Ca isotopes: Resurgence of theN=28shell strength

Low-spin particle/hole-core excitations in $^{41,47,49}$Ca isotopes studied by cold-neutron capture reactions

Nuclear data sheets for A = 49

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