Nuclear Data Sheets for A = 38

Cameron, J. A.; Singh, Balraj

doi:10.1016/j.nds.2007.12.001

Cited by 39 publications

(24 citation statements)

References 323 publications

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“…[ We observe strong transitions at 1292(4), 1515(6), and 1534(5) keV that can be identified with the previously reported 2 [18,20,[33][34][35]. This is consistent with the coincidence spectra shown in Fig.…”

Section: Asupporting

confidence: 91%

In-beam γ -ray spectroscopy of S38–42

et al. 2016

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The low-energy excitation level schemes of the neutron-rich 38−42 S isotopes are investigated via in-beam γ-ray spectroscopy following the fragmentation of 48 Ca and 46 Ar projectiles on a 12 C target at intermediate beam energies. Information on γγ coincidences complemented by comparisons to shell-model calculations were used to construct level schemes for these neutron-rich nuclei. The experimental data are discussed in the context of large-scale shell-model calculations with the SDPF-MU effective interaction in the sd-pf shell. For the even-mass S isotopes, the evolution of the yrast sequence is explored as well as a peculiar change in decay pattern of the second 2 + states at N = 26. For the odd-mass 41 S, a level scheme is presented that seems complete below 2.2 MeV and consistent with the predictions by the SDPF-MU shell-model Hamiltonian; this is a remarkable benchmark given the rapid shell and shape evolution at play in the S isotopes as the broken-down N = 28 magic number is approached. Furthermore, the population of excited final states in projectile fragmentation is discussed.

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Section: Asupporting

confidence: 91%

In-beam γ -ray spectroscopy of S38–42

et al. 2016

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“…The excitation energy of the first 2 + state of 38 S is 1292 keV [55] and this suggests that a particle-core coupling description is appropriate for the 1517-keV J π = (11/2 − ) state of 39 S. in relation to the odd-A isotopes is rather sparse. The data presented in the figure were taken from Nuclear Data Sheet references [49,52,[55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72]. For the isotopes of sulfur and argon, the figure shows a good correlation between the behavior of the excitation energy of the first 2 + states of the even-A isotopes and the excitation energy differences of the first 11/2 − and first 7/2 − states of the odd-A isotopes with neutron number.…”

Section: Resultsmentioning

confidence: 99%

First in-beamγ-ray study of the level structure of neutron-richS39

et al. 2016

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The neutron-rich 39 S nucleus has been studied using binary grazing reactions produced by the interaction of a 215-MeV beam of 36 S ions with a thin 208 Pb target. The magnetic spectrometer, PRISMA, and the γ -ray array, CLARA, were used in the measurements. Gamma-ray transitions of the following energies were observed: 339, 398, 466, 705, 1517, 1656, and 1724 keV. Five of the observed transitions have been tentatively assigned to the decay of excited states with spins up to (11/2 − ). The results of a state-of-the-art shell-model calculation of the level scheme of 39 S using the SDPF-U effective interaction are also presented. The systematic behavior of the excitation energy of the first 11/2 − states in the odd-A isotopes of sulfur and argon is discussed in relation to the excitation energy of the first excited 2 + states of the adjacent even-A isotopes. The states of 39 S that have the components in their wave functions corresponding to three neutrons in the 1f 7/2 orbital outside the N = 20 core have also been discussed within the context of the 0 ω shell-model calculations presented here.

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“…38 Ca showing the four strongest β branches and the most intense subsequent γ-ray transitions in 38 K. For each level, its (J π , T) is given as well as its energy, expressed in keV, relative to the 38 K ground state [5]. Branching percentages come from this measurement.…”

Section: Fig 2 Beta-decay Scheme Ofmentioning

confidence: 99%

“…Our search for, and identification of weak γ rays following the decay of 38 Ca was based on the known level scheme of 38 K [5] and was guided by the results of previous studies [19,20]. In the fit of the 328-keV γ-peak area, it was especially important to have a reliable "background" in that energy region because the 328-keV γ-ray full-energy peak is located close to the Compton edge of the scattering distribution from 511-keV positronannihilation radiation.…”

Section: F Relative γ-Ray Intensitiesmentioning

confidence: 99%

Precise measurement of branching ratios in theβdecay ofCa38

et al. 2015

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We present the full description of a measurement of the branching ratios for the β-decay of 38 Ca. This decay includes five allowed 0 + → 1 + branches and a superallowed 0 + → 0 + one. With our new result for the latter, we determine its f t value to be 3062.3±6.8 s, a result whose precision (0.2%) is comparable to the precision of the thirteen well known 0 + → 0 + transitions used up till now for the determination of V ud , the up-down quark-mixing element of the CKM matrix. The 38 Ca superallowed transition thus becomes the first addition to this set of transitions in nearly a decade and the first for which a precise mirror comparison is possible, thus enabling an improved test of the isospin-symmetry-breaking corrections required for the extraction of V ud .

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Nuclear Data Sheets for A = 38

Cited by 39 publications

References 323 publications

In-beam γ -ray spectroscopy of S38–42

In-beam γ -ray spectroscopy of S38–42

First in-beamγ-ray study of the level structure of neutron-richS39

Precise measurement of branching ratios in theβdecay ofCa38

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