Nuclear Data Sheets for A = 51

Huang, Xiaolong

doi:10.1016/j.nds.2006.07.002

Cited by 40 publications

(18 citation statements)

References 242 publications

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“…The reaction product 51 Cr decays to the first excited state in 51 V by electron capture and subsequent emission of a characteristic E γ = 320 keV photon with a half-life of T 1/2 = 27.7 d and a branching probability of 9.9 % [36]. The activity and therefore the number of produced 51 Cr nuclei was determined by counting the emitted γ-rays using a Pb-Cu shielded counting station at Notre Dame.…”

Section: Bmentioning

confidence: 99%

Measurement of the reaction17O(α,n)20Ne and its impact on thes
Best
¹
,
Beard
²
,
Couder
³

et al. 2013
Phys. Rev. C
42
3
61
2
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Background:The ratio between the rates of the reactions 17 O(α, n) 20 Ne and 17 O(α, γ) 21 Ne determines whether 16 O is an efficient neutron poison for the s process in massive stars, or if most of the neutrons captured by 16 O(n, γ) are recycled into the stellar environment. This ratio is of particular relevance to constrain the s process yields of fast rotating massive stars at low metallicity.Purpose: Recent results on the (α, γ) channel have made it necessary to measure the (α, n) reaction more precisely and investigate the effect of the new data on s process nucleosynthesis in massive stars. Method:The 17 O(α, n (0+1) ) reaction has been measured with a moderating neutron detector. In addition, the (α, n1) channel has been measured independently by observation of the characteristic 1633 keV γ-transition in 20 Ne. The reaction cross section was determined with a simultaneous R-matrix fit to both channels. (α, n) and (α, γ) resonance strengths of states lying below the covered energy range were estimated using their known properties from the literature. Results: The reaction channels17 O(α, n0) 20 Ne and 17 O(α, n1γ) 20 Ne were measured in the energy range Eα = 800 keV to 2300 keV. A new 17 O(α, n) reaction rate was deduced for the temperature range 0.1 GK to 10 GK. At typical He burning temperatures, the combination of the new (α, n) rate with a previously measured (α, γ) rate gives approximately the same ratio as current compilations. The influence on the nucleosynthesis of the s process in massive stars at low metallicity is discussed.Conclusions: It was found that in He burning conditions the (α, γ) channel is strong enough to compete with the neutron channel. This leads to a less efficient neutron recycling compared to a previous suggestion of a very weak (α, γ) channel. S process calculations using our rates confirm that massive rotating stars do play a significant role in the production of elements up to Sr, but they strongly reduce the s process contribution to heavier elements.

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Section: Bmentioning

confidence: 99%

Measurement of the reaction17O(α,n)20Ne and its impact on thes
Best
¹
,
Beard
²
,
Couder
³

et al. 2013
Phys. Rev. C
42
3
61
2
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“…A 5 cm thick layer of 5% borated polyethylene surrounds the detector to reduce the background count rate due to neutrons coming from the outside. This detector has been used in the measurement of various ða,nÞ reactions (e.g., 17 Oða,nÞ 20 Ne [21] and 25 Mgða,nÞ 28 Si [22]) and background runs without beam were regularly performed over the course of the experiments. Typical background count rates in the shielded detector were measured to be about 20 counts=min.…”

Section: Number and Positioning Of The Countersmentioning

confidence: 99%

“…The targets were produced by evaporating a thin layer (less than 2 keV in terms of energy loss of the proton beam) of vanadium on a 0.3 mm thick tantalum backing. The reaction product, 51 Cr, decays to the first excited state in 51 V by electron capture and subsequent emission of a characteristic E g ¼ 320 keV photon (with branching probability of 9.9% [28]) with a half-life of T 1=2 ¼ 27:7 d. The activity and therefore the number of produced 51 Cr nuclei was determined by counting the g-rays emitted using a Pb-Cu shielded counting station.…”

Section: Experimental Testsmentioning

confidence: 99%

A 3He neutron detector for the measurement of reactions

Falahat

Best

Couder

et al. 2013

Nuclear Instruments and Methods in Physics Research Section A:

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“…The T = 3/2 quartets have shown an interesting, increasing trend in the cubic IMME coefficients * dmitrii.nesterenko@jyu.fi when entering into the f 7/2 shell [9,10]. On the other hand, the quadratic IMME at A = 53 has been recently revalidated with a reduced χ 2 of 1.34, and the cubic coefficient has been found to be rather small, d = 5.4 (46) keV [11] compared to d = 39 (11) keV obtained in Ref. [12].…”

Section: Introductionmentioning

confidence: 99%

High-precision mass measurements for the isobaric multiplet mass equation atA= 52

Nesterenko¹,

Kankainen²,

Cañete³

et al. 2017

J. Phys. G: Nucl. Part. Phys.

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Masses ofCo m have been experimentally determined for the first time and found to be more bound than predicted by extrapolations. The isobaric multiplet mass equation for the T = 2 quintet at A = 52 has been studied employing the new mass values. No significant breakdown (beyond the 3σ level) of the quadratic form of the IMME was observed (χ 2 /n = 2.4). The cubic coefficient was 6.0(32) keV (χ 2 /n = 1.1). The excitation energies for the isomer and the T = 2 isobaric analogue state in 52 Co have been determined to be 374(13) keV and 2922(13) keV, respectively. The Q value for the proton decay from the 19/2 − isomer in 53 Co has been determined with an unprecedented precision, Qp = 1558.8(17) keV. The proton separation energies of 52 Co and 53 Ni relevant for the astrophysical rapid proton capture process have been experimentally determined for the first time.

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Nuclear Data Sheets for A = 51

Cited by 40 publications

References 242 publications

Measurement of the reaction17O(α,n)20Ne and its impact on thes
Best
¹
,
Beard
²
,
Couder
³

et al. 2013
Phys. Rev. C
42
3
61
2
View full text Add to dashboard Cite

Measurement of the reaction17O(α,n)20Ne and its impact on thes
Best
¹
,
Beard
²
,
Couder
³

et al. 2013
Phys. Rev. C
42
3
61
2
View full text Add to dashboard Cite

A 3He neutron detector for the measurement of reactions

High-precision mass measurements for the isobaric multiplet mass equation atA= 52

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Nuclear Data Sheets for A = 51

Cited by 40 publications

References 242 publications

Measurement of the reaction17O(α,n)20Ne and its impact on thesBest1, Beard2, Couder3 et al. 2013Phys. Rev. C423612View full textAdd to dashboardCite

Measurement of the reaction17O(α,n)20Ne and its impact on thesBest1, Beard2, Couder3 et al. 2013Phys. Rev. C423612View full textAdd to dashboardCite

A 3He neutron detector for the measurement of reactions

High-precision mass measurements for the isobaric multiplet mass equation atA= 52

Contact Info

Product

Resources

About

Measurement of the reaction17O(α,n)20Ne and its impact on thes
Best
¹
,
Beard
²
,
Couder
³

et al. 2013
Phys. Rev. C
42
3
61
2
View full text Add to dashboard Cite

Measurement of the reaction17O(α,n)20Ne and its impact on thes
Best
¹
,
Beard
²
,
Couder
³

et al. 2013
Phys. Rev. C
42
3
61
2
View full text Add to dashboard Cite