Quenching of the SnSbTe Cycle in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>r</mml:mi><mml:mi>p</mml:mi></mml:math>Process

Elomaa, V.‐V.; Vorobjev, G.; Kankainen, A.; Batist, L.; Eliseev, Sergey; Eronen, T.; Hakala, J.; Jokinen, A.; Moore, I. D.; Novikov, Yu. N.; Penttilä, H.; Popov, A. V.; Rahaman, S.; Rissanen, J.; Saastamoinen, A.; Schatz, H.; Seliverstov, D. M.; Weber, C.; Äystö, J.

doi:10.1103/physrevlett.102.252501

Cited by 86 publications

(69 citation statements)

References 21 publications

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“…Motivated by the data needs of X-ray burst models, a large number of mass measurements on very neutron deficient isotopes have been carried out by taking advantage of new radioactive beam production capabilities and advances in experimental techniques such as Penning traps (Clark et al 2004;Rodríguez et al 2004;Schury et al 2007;Clark et al 2007;Weber et al 2008;Savory et al 2009;Elomaa et al 2009;Haettner et al 2011;Fallis et al 2011;Kankainen et al 2012) and storage rings (Stadlmann et al 2004;Yan et al 2013). These techniques provide mass data with the required accuracy of better than 10-100 keV or about 1:10 6 .…”

Section: Introductionmentioning

confidence: 99%

Dependence of X-Ray Burst Models on Nuclear Masses

Schatz

Ong

2017

ApJ

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X-ray burst model predictions of light curves and final composition of the nuclear ashes are affected by uncertain nuclear masses. However, not all of these masses are determined experimentally with sufficient accuracy. Here we identify remaining nuclear mass uncertainties in X-ray burst models using a one zone model that takes into account the changes in temperature and density evolution caused by changes in the nuclear physics. Two types of bursts are investigated -a typical mixed H/He burst with a limited rp-process and an extreme mixed H/He burst with an extended rp-process. When allowing for a 3σ variation only three remaining nuclear mass uncertainties affect the light curve predictions of a typical H/He burst ( 27 P, 61 Ga, and In. The smallest mass uncertainty that still impacts composition significantly when varied by 3σ is 85 Mo with 16 keV uncertainty. For one of the identified masses, 27 P, we use the isobaric mass multiplet equation (IMME) to improve the mass uncertainty, obtaining an atomic mass excess of -716(7) keV. The results provide a roadmap for future experiments at advanced rare isotope beam facilities, where all the identified nuclides are expected to be within reach for precision mass measurements.

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Section: Introductionmentioning

confidence: 99%

Dependence of X-Ray Burst Models on Nuclear Masses

Schatz

Ong

2017

ApJ

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“…Since theoretical mass-models are not sufficiently reliable in this region of the nuclidic chart, their experimental determination is critical. Recently, the proton separation energy of 106 Sb was determined experimentally [12], the measured values indicating that the rp-process does not terminate in a loop as originally thought, but it simply dies out. Nevertheless, the determination of the proton separation energies of its more exotic neighbouring nuclei, including 104 Sb, is still important in order to rule out completely the existence of the Sn-Sb-Te loop, which could survive through proton capture on 103 Sn, if 104 Sb is more proton bound than predicted [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the decays of112Cs and111Xe

et al. 2012

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An experiment to search for the alpha decay of 112 Cs has been performed at the Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Laboratory. The alpha decay of 112 Cs was not observed, thus setting the upper limit of the alpha branching ratio at 0.26%. The half-life of 112 Cs was measured as 506 ± 55 µs. In the same measurement the decay properties of its proton decay daughter 111 Xe were also reinvestigated. The newly measured alpha branching ratio for 111 Xe is 10.4 ± 1.9 %. The experimental proton separation energies Sp for odd-Z nuclei above 100 Sn were compared to shell model calculations. The calculated proton separation energies for 103 Sb and 102 Sb point to half-lives of the order of 10 ps and 1 ns, respectively.

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“…Then, at that so-called "waiting points", for example, 60 Zn, 64 Ge, and 68 Se, the competition between the respective proton capture and the β -decay of a waiting point governs the flow of materials and determines the abundances of following heavier nuclei [5], and may eventually affect the end light curve of the burst. During the thermonuclear runaway of that XRB, peak temperatures may be close to or exceed 1 GK, causing nucleosynthesis of nuclei up to A ≈ 100 nuclei [15,16]. A few decisive factors like accretion rate, the composition of accreted materials, the neutron star radius and surface gravity, nuclear masses and reaction rates are the essential input data for XRB models.…”

Section: Introductionmentioning

confidence: 99%

New Reaction Rates Of 64Ge(p,γ)65As(p,γ)66Se And The Impact On Type I X-ray Bursts

Lam

Schatz

et al. 2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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The nucleosynthesis occurring in type-I X-ray bursts (XRBs) and the respective energy released in these thermonuclear explosions are sensitive to nuclear masses and reaction rates around the 64 Ge waiting point. Based on the recently measured masses of 64 Ge and 65 As, the deduced proton separation energies S p ( 65 As) and S p ( 66 Se), and nuclear structure information from large-scale shell model calculations, we have obtained new reaction rates of 64 Ge(p, γ) 65 As and 65 As(p, γ) 66 Se with reliable uncertainties. Our new thermonuclear reaction rate of 64 Ge(p, γ) 65 As differs from those available in REACLIB by up to two orders of magnitude at temperature range associated with type-I X-ray bursts. We evaluated the impact of these new rates, particularly the energy generation and the burst light curve, with self-consistent one-zone model [Schatz et al. Phys. Rev. Lett. 86 (2001) 3471]. Also, we identified the nuclear physics uncertainties determining the role of the 64 Ge to be a waiting point in XRBs, and strongly affecting XRB model predictions of the synthesis of 64 Zn and the synthesis of nuclei A ≥ 64.

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Quenching of the SnSbTe Cycle in therpProcess

Cited by 86 publications

References 21 publications

Dependence of X-Ray Burst Models on Nuclear Masses

Dependence of X-Ray Burst Models on Nuclear Masses

Experimental study of the decays of112Cs and111Xe

New Reaction Rates Of 64Ge(p,γ)65As(p,γ)66Se And The Impact On Type I X-ray Bursts

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