Resolution of the95Zr ground state into a doublet

Frota-Pessoa, E.; Joffily, S.

doi:10.1007/bf02813625

Cited by 9 publications

(14 citation statements)

References 6 publications

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“…But these lines may also come from the decay of the 1/2 + , 954 keV level to the 23 keV level in 95 Zr, if the excitation energy of the 23 keV level is slightly larger than given in Ref. [16].…”

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confidence: 81%

“…Finally, Ref. [16] measured the 94 Zr͑d,p͒ 95 Zr reaction at 15.5 MeV with a quoted energy resolution of 13 keV, and a clear doublet structure is found.…”

mentioning

confidence: 98%

“…The ground state with J =5/2 + has a half-life of T 1/2 =64.032±0.006 days. The next level at E x =23 keV is shown with a question mark because it has been seen only in one ͑d,p͒ transfer experiment [16]. Because of the L=2 transfer it is tentatively assigned to J =3/2 + ,5/2 + .…”

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confidence: 99%

“…[16] from a ͑d,p͒ experiment. One may read some evidence for this level from a second ͑d,p͒ experiment [21].…”

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confidence: 99%

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First excited state of thes-process branching nucleusZr95

et al. 2003

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The transfer reaction 94 Zr͑d,p͒ 95 Zr has been studied to check the existence of a low-lying first excited level at 23 keV in 95 Zr. This level-if it exists-might have significant influence on the branching of the astrophysical s process at the branching nucleus 95 Zr. Our experimental spectra, measured with very good energy resolution, do not show any evidence for the existence of such a low-lying level. This is in agreement with experimental results from several reactions and contradicts the only claim for evidence of such a low-lying level which was also derived from 94 Zr͑d,p͒ 95 Zr data, however with moderate resolution, but still the best of the previous experiments.

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mentioning

confidence: 81%

“…Finally, Ref. [16] measured the 94 Zr͑d,p͒ 95 Zr reaction at 15.5 MeV with a quoted energy resolution of 13 keV, and a clear doublet structure is found.…”

mentioning

confidence: 98%

mentioning

confidence: 99%

“…[16] from a ͑d,p͒ experiment. One may read some evidence for this level from a second ͑d,p͒ experiment [21].…”

mentioning

confidence: 99%

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First excited state of thes-process branching nucleusZr95

et al. 2003

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“…The SEF and X do not deviate from unity over the entire temperature range of the s-process because G 0 (T ) = 1. Note that there was an earlier claim for a low-lying, first excited state with J π = (3/2, 5/2) + at 23 keV, but it was only observed in one particular experiment (Frota-Pessôa & Joffily 1986). The existence of such a level was excluded in a later highresolution experiment (Sonnabend et al 2003b).…”

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confidence: 99%

OPPORTUNITIES TO CONSTRAIN ASTROPHYSICAL REACTION RATES FOR THEs-PROCESS VIA DETERMINATION OF THE GROUND-STATE CROSS-SECTIONS

Rauscher

Mohr

Dillmann

et al. 2011

ApJ

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Modern models of s-process nucleosynthesis in stars require stellar reaction rates of high precision. Most neutroncapture cross-sections in the s-process have been measured, and for an increasing number of reactions the required precision is achieved. This does not necessarily mean, however, that the stellar rates are constrained equally well, because only the capture of the ground state of a target is measured in the laboratory. Captures of excited states can contribute considerably to stellar rates that are already at typical s-process temperatures. We show that the ground-state contribution X to a stellar rate is the relevant measure to identify reactions that are or could be well constrained by experiments and apply it to (n,γ ) reactions in the s-process. We further show that the maximum possible reduction in uncertainty of a rate via determination of the ground-state cross-section is given directly by X. An error analysis of X is presented, and it is found that X is a robust measure with mostly small uncertainties.

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