Mass Measurements of Very Neutron-Deficient Mo and Tc Isotopes and Their Impact on<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 Nucleosynthesis

Haettner, E.; Ackermann, D.; Audi, G.; Blaum, Klaus; Block, M.; Eliseev, Sergey; Fleckenstein, T.; Herfurth, F.; Heßberger, F. P.; Hofmann, S.; Ketelaer, Jens; Ketter, Jochen; Kluge, H. J.; Marx, G.; Mazzocco, M.; Novikov, Yu. N.; Plaß, W. R.; Rahaman, S.; Rauscher, T.; Rodriguez, D. Rodriguez; Schatz, H.; Scheidenberger, C.; Schweikhard, L.; Sun, B.; Thirolf, P. G.; Vorobjev, G.; Wang, M.; Webe, C.

doi:10.1103/physrevlett.106.122501

Cited by 52 publications

(38 citation statements)

References 23 publications

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“…The results reported here show that the relevant b βp are small and do not significantly affect rp-process nucleosynthesis in the A = 92-98 region. Along with recent mass measurements [54][55][56], the results presented here are an important step towards more reliable rp-process calculations in this mass region. With the β-decay properties largely pinned down, the remaining uncertainties arise from the unknown nuclear masses near the proton drip line and the untested proton capture rates in this entire region.…”

Section: Discussionmentioning

confidence: 59%

β-delayed proton emission in the100Sn region

Lorusso¹,

Becerril²,

Amthor³

et al. 2012

Phys. Rev. C

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β-delayed proton emission from nuclides in the neighborhood of 100 Sn was studied at the National Superconducting Cyclotron Laboratory. The nuclei were produced by fragmentation of a 120 MeV/nucleon 112 Sn primary beam on a Be target. Beam purification was provided by the A1900 Fragment Separator and the Radio Frequency Fragment Separator. The fragments of interest were identified and their decay was studied with the NSCL Beta Counting System (BCS) in conjunction with the Segmented Germanium Array (SeGA +1.9 −1.7 %, 1.3(5)%, 1.9(1)%, 7.5(5)% and 2.5(3)%, respectively. The b βp = 22(1)% for 101 Sn was deduced with higher precision than previously reported. The impact of the newly measured b βp values on the composition of the type-I X-ray burst ashes was studied.

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Section: Discussionmentioning

confidence: 59%

β-delayed proton emission in the100Sn region

Lorusso¹,

Becerril²,

Amthor³

et al. 2012

Phys. Rev. C

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“…Heavy element research is one of the strong pillars of the SHIPTRAP program, however, different topics from other fields like astrophysical nucleosynthesis (see, e.g., [104]) are addressed as well using preseparated isotopes in a lighter mass region.…”

Section: Shiptrap At Shipmentioning

confidence: 99%

Superheavy element studies with preseparated isotopes

Düllmann¹

2011

Radiochimica Acta

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Superheavy elements / Transactinides / Physical preseparation / Recoil separatorSummary. In recent years, significant progress in the field of superheavy element research has been achieved thanks to a novel combination of techniques from different fields. This "physical preseparation" approach includes the coupling of an ancillary setup -typically a chemistry apparatus or a counting setup -to a physical recoil separator. This latter preseparator removes unwanted nuclear reaction products as well as the intense heavy-ion beam associated with superheavy element experiments and thus isolates the evaporation residues of the nuclear fusion reactions. These are guided to the separators's focal plane, where they are extracted and available for further transport to external setups, e.g., by a gas-jet. In this overview, the development of physical preseparation is described, and experimental results from nuclear chemistry and physics that were achieved with "preseparated" isotopes are summarized, with an emphasis on results relevant for superheavy element research. The covered topics range from chemical studies in the liquid as well as in the gas phase, the measurement of nuclear decay properties and of atomic masses. Preseparation was already shown to be a very powerful approach in these studies and promises to allow further progress in superheavy element research.

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“…On the proton-rich side of β stability, between elements Mo and Pd, there is a region where the masses have only recently been determined [1][2][3]. These masses have become the subject of much interest [1][2][3][4][5][6][7] because two astrophysical nucleosynthetic processes, the rp and νp processes, pass through this region.…”

Section: Introductionmentioning

confidence: 99%

“…These masses have become the subject of much interest [1][2][3][4][5][6][7] because two astrophysical nucleosynthetic processes, the rp and νp processes, pass through this region. The proton-capture (p,γ ) and photodisintegration (γ ,p) rates needed to model these processes depend on the proton-separation energies S p which, due to the lack of mass information, have had to be calculated using extrapolated mass values or values from mass models.…”

Section: Introductionmentioning

confidence: 99%

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Mass measurements of isotopes of Nb, Mo, Tc, Ru, and Rh along theνp- andrp-process paths using the Canadian Penning trap mass spectrometer

Fallis¹,

Clark²,

Sharma³

et al. 2011

Phys. Rev. C

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The reaction paths of two proposed nucleosynthetic processes on the proton-rich side of stability, the rp and νp processes, pass through a region of isotopes between Mo and Pd where masses had long gone unmeasured. Precise knowledge of the paths and final abundances of these two processes has been limited by the corresponding lack of precision in the proton-separation energies S p when derived from extrapolated masses. The masses of 18 neutron-deficient isotopes of Nb, Mo, Tc, Ru, and Rh have been measured using the Canadian Penning trap mass spectrometer. Three of the masses presented, 90 Mo, 91 Mo, and 93 Tc, provide the first direct measurement of the masses of these nuclides, and the others provide confirmation of recent measurements using other Penning traps. Included in this work is a measurement of the mass of 87 Mo, which differs by 3.7σ from the mass presented in the 2003 Atomic Mass Evaluation. This leads to a change in the S p value of 88 Tc which reduces the suppression of flow of the νp-process path through 87 Mo(p, γ ) 88 Tc reported following the mass measurement of 88 Tc [C. Weber et al., Phys. Rev. C 78, 054310 (2008)]. This in turn affects the resulting νp-process abundances.

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Mass Measurements of Very Neutron-Deficient Mo and Tc Isotopes and Their Impact onrpProcess Nucleosynthesis

Cited by 52 publications

References 23 publications

β-delayed proton emission in the100Sn region

β-delayed proton emission in the100Sn region

Superheavy element studies with preseparated isotopes

Mass measurements of isotopes of Nb, Mo, Tc, Ru, and Rh along theνp- andrp-process paths using the Canadian Penning trap mass spectrometer

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