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Title:

α decay of the very neutron-deficient isotopes 197–199Fr

Author:

Kalaninova, Z.; JFA; CORA; Andreyev, A. N.; Antalic, S.; Heßberger, F. P.; Ackermann, D.; Andel, B.; Drummond, M. C.; Hofmann, S.; Huyse, Mark; U0013345; JLA; Kindler, B.; Lane, J. F. W.; Liberati, V.; Lommel, B.; Page, R. D.; Rapisarda, Elisa; U0073294; JLA; Sandhu, K.; Saro, S.; Thornthwaite, A.; Van Duppen, Piet; U0010286; JLA; Minimize authors

Description:

Decay properties of the very neutron-deficient isotopes 197–199Fr were studied at the velocity filter Separator for Heavy Ion reaction Products (SHIP) at GSI in Darmstadt. The isotopes were produced in the 2n–4n evaporation channels of the fusion-evaporation reaction 60Ni+141Pr → 201Fr*. Improved α-decay properties of 199Fr were determined and t...

Decay properties of the very neutron-deficient isotopes 197–199Fr were studied at the velocity filter Separator for Heavy Ion reaction Products (SHIP) at GSI in Darmstadt. The isotopes were produced in the 2n–4n evaporation channels of the fusion-evaporation reaction 60Ni+141Pr → 201Fr*. Improved α-decay properties of 199Fr were determined and the possible existence of two α-decaying states in this nucleus is discussed. For the isotope 198Fr a broad α-decay energy distribution was detected in the range of (7470–7930) keV and two α-decaying states were observed with half-lives of 1.1(7) and 15(3) ms. The new isotope 197Fr was identified based on the observation of one α-decay chain yielding Eα= 7728(15) keV and T1/2 = 0.6+3.0 −0.3 ms. The systematics of reduced α-decay widths are presented for neutron-deficient francium, radon, and astatine isotopes. ; status: published Minimize

Publisher:

Published for the American Physical Society by the American Institute of Physics

Year of Publication:

2013-04-29

Document Type:

Article ; IT ; article ; 226275;Article

Language:

en

Rights:

226274;intranet ; 226275;intranet

226274;intranet ; 226275;intranet Minimize

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Physical Review C, Nuclear Physics vol:87 issue:4 pages:1-8

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Title:

Regulation of the Spermatogonial Stem Cell Niche

Author:

Description:

Spermatogonial stem cells (SSCs) reside within specialized microenvironments called ‘niches’, which are essential for their maintenance and self-renewal. In the mammalian testis, the main components of the niche include the Sertoli cell, the growth factors that this nursing cell produces, the basement membrane, and stimuli from the vascular netw...

Spermatogonial stem cells (SSCs) reside within specialized microenvironments called ‘niches’, which are essential for their maintenance and self-renewal. In the mammalian testis, the main components of the niche include the Sertoli cell, the growth factors that this nursing cell produces, the basement membrane, and stimuli from the vascular network between the seminiferous tubules. This review focuses on signalling pathways maintaining SSCs self-renewal and differentiation and describes potential mechanisms of regulation of the spermatogonial stem cell niche. Minimize

Year of Publication:

2008-07

Document Type:

Text

Language:

en

Subjects:

Article

Article Minimize

Rights:

© 2008 The Authors. Journal compilation © 2008 Blackwell Verlag

© 2008 The Authors. Journal compilation © 2008 Blackwell Verlag Minimize

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Title:

The $A_y$-Problem in Refined Resonating Group Model calculations for ($p-^3{\rm He}$) Scattering

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Description:

We report on a microscopic Refined Resonating Group Model (RRGM) calculation of scattering of $p$ off ${}^3{\rm He}$ employing the Argonne-$v_{14}$ and the Bonn nucleon-nucleon potentials without three-nucleon forces at low energies up to 30 MeV. The calculated phase-shifts verify the well-known proton analyzing power $A_y$-problem. We demonstra...

We report on a microscopic Refined Resonating Group Model (RRGM) calculation of scattering of $p$ off ${}^3{\rm He}$ employing the Argonne-$v_{14}$ and the Bonn nucleon-nucleon potentials without three-nucleon forces at low energies up to 30 MeV. The calculated phase-shifts verify the well-known proton analyzing power $A_y$-problem. We demonstrate that with corrected ${}^3P_2$ phase-shifts experimental differential cross-section and analyzing power data can be explained. ; Comment: LaTeX, 16 pages, 6 eps-figures, 3 tables, to be published in Nucl. Phys. A (accepted) Minimize

Year of Publication:

2003-01-13

Document Type:

text

Subjects:

Nuclear Theory

Nuclear Theory Minimize

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Title:

Bericht über MEQ ; Datenbankentwicklung an der privaten Universität Witten/Herdecke ; Bericht über MEQ ; Datenbankentwicklung an der privaten Universität Witten/Herdecke

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Publisher:

German Medical Science; Düsseldorf, Köln

Year of Publication:

2006-10-23

Source:

M0042

M0042 Minimize

Document Type:

conferenceObject

Language:

deu

Subjects:

ddc:610

ddc:610 Minimize

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http://www.egms.de/en/terms.htm

http://www.egms.de/en/terms.htm Minimize

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Title:

Bericht über MEQ ; Datenbankentwicklung an der privaten Universität Witten/Herdecke ; Bericht über MEQ ; Datenbankentwicklung an der privaten Universität Witten/Herdecke

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Publisher:

German Medical Science; Düsseldorf, Köln

Year of Publication:

2007-02-16

Source:

GMS Zeitschrift für Medizinische Ausbildung

GMS Zeitschrift für Medizinische Ausbildung Minimize

Document Type:

article

Language:

deu

Subjects:

Humanmedizin ; ddc:610

Humanmedizin ; ddc:610 Minimize

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http://www.egms.de/en/terms.htm

http://www.egms.de/en/terms.htm Minimize

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Title:

Technische Grundlagen des Ostrakon Systems für Online Evaluation

Author:

Publisher:

German Medical Science GMS Publishing House; Düsseldorf

Year of Publication:

2007-11-14

Source:

M0052

M0052 Minimize

Document Type:

conferenceObject

Language:

deu

Subjects:

ddc:610

ddc:610 Minimize

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http://www.egms.de/en/terms.htm

http://www.egms.de/en/terms.htm Minimize

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Title:

Density dependent hadron field theory for asymmetric nuclear matter and exotic nuclei

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Description:

The density dependent relativistic hadron field (DDRH) theory is applied to strongly asymmetric nuclear matter and finite nuclei far off stability. A new set of in-medium meson-nucleon vertices is derived from Dirac-Brueckner Hartree-Fock (DBHF) calculations in asymmetric matter, now accounting also for the density dependence of isovector coupli...

The density dependent relativistic hadron field (DDRH) theory is applied to strongly asymmetric nuclear matter and finite nuclei far off stability. A new set of in-medium meson-nucleon vertices is derived from Dirac-Brueckner Hartree-Fock (DBHF) calculations in asymmetric matter, now accounting also for the density dependence of isovector coupling constants. The scalar-isovector $\delta$ meson is included. Nuclear matter calculations show that it is necessary to introduce a momentum correction in the extraction of coupling constants from the DBHF self-energies in order to reproduce the DBHF equation of state by DDRH mean-field calculations. The properties of DDRH vertices derived from the Groningen and the Bonn A nucleon-nucleon (NN) potentials are compared in nuclear matter calculations and for finite nuclei. Relativistic Hartree results for binding energies, charge radii, separation energies and shell gaps for the Ni and Sn isotopic chains are presented. Using the momentum corrected vertices an overall agreement to data on a level of a few percent is obtained. In the accessible range of asymmetries the $\delta$ meson contributions to the self-energies are found to be of minor importance but asymmetry dependent fluctuations may occur. ; Comment: 33 pages, 15 figures Minimize

Year of Publication:

2000-07-20

Document Type:

text

Subjects:

Nuclear Theory

Nuclear Theory Minimize

DDC:

541 Physical chemistry *(computed)*

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Title:

Density dependent hadron field theory for hypernuclei

Author:

Description:

The Density Dependent Relativistic Hadron Field (DDRH) theory, previously introduced and applied to isospin nuclei, is extended to hypernuclei by including the octet hyperons. Infinite matter Dirac-Brueckner theory for octet baryons and the derivation of in-medium DDRH baryon-meson vertices is discussed. From the properties of Dirac-Brueckner in...

The Density Dependent Relativistic Hadron Field (DDRH) theory, previously introduced and applied to isospin nuclei, is extended to hypernuclei by including the octet hyperons. Infinite matter Dirac-Brueckner theory for octet baryons and the derivation of in-medium DDRH baryon-meson vertices is discussed. From the properties of Dirac-Brueckner interactions it is found that hyperon and nucleon self-energies and vertices are related by the ratios of free space coupling constants. This leads to simple scaling laws for the in-medium hyperon and nucleon vertices. The model is applied in relativistic DDRH mean-field calculations to singl$\Lambda nuclei. Free space N-Lambda T-matrix results are used for the scalar vertex. As the only free parameter the hyperon vector vertex scaling factor is adjusted to a selected set of hypernuclear data. Spectroscopic data of single Lambda hypernuclei over the full mass range are well described. The reduced Lambda spin-orbit splitting is reproduced and found to be related closely the medium dependence of scalar and vector interactions. ; Comment: 38 pages, 9 figures Minimize

Year of Publication:

1999-11-03

Document Type:

text

Subjects:

Nuclear Theory

Nuclear Theory Minimize

DDC:

539 Modern physics *(computed)*

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Title:

Application of the density dependent hadron field theory to neutron star matter

Author:

Description:

The density dependent hadron field (DDRH) theory, previously applied to isospin nuclei and hypernuclei is used to describe $\beta$-stable matter and neutron stars under consideration of the complete baryon octet. The meson-hyperon vertices are derived from Dirac-Brueckner calculations of nuclear matter and extended to hyperons. We examine proper...

The density dependent hadron field (DDRH) theory, previously applied to isospin nuclei and hypernuclei is used to describe $\beta$-stable matter and neutron stars under consideration of the complete baryon octet. The meson-hyperon vertices are derived from Dirac-Brueckner calculations of nuclear matter and extended to hyperons. We examine properties of density dependent interactions derived from the Bonn A and from the Groningen NN potential as well as phenomenological interactions. The consistent treatment of the density dependence introduces rearrangement terms in the expression for the baryon chemical potential. This leads to a more complex condition for the $\beta$-equilibrium compared to standard relativistic mean field (RMF) approaches. We find a strong dependence of the equation of state and the particle distribution on the choice of the vertex density dependence. Results for neutron star masses and radii are presented. We find a good agreement with other models for the maximum mass. Radii are smaller compared to RMF models and indicate a closer agreement with results of non-relativistic Brueckner calculations. ; Comment: 28 pages, 11 figures Minimize

Year of Publication:

2000-08-21

Document Type:

text

Subjects:

Nuclear Theory

Nuclear Theory Minimize

DDC:

541 Physical chemistry *(computed)*

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Title:

Probing Isospin Dynamics in Halo Nuclei

Author:

Description:

Nuclear many-body theory is used to study nuclear matter and finite nuclei at extreme isospin. In-medium interactions in asymmetric nuclear matter are obtained from (Dirac-) Brueckner theory. Neutron skin formation in Ni and Sn isotopes is investigated by relativistic mean-field calculations in DDRH theory with density dependent meson-nucleon ve...

Nuclear many-body theory is used to study nuclear matter and finite nuclei at extreme isospin. In-medium interactions in asymmetric nuclear matter are obtained from (Dirac-) Brueckner theory. Neutron skin formation in Ni and Sn isotopes is investigated by relativistic mean-field calculations in DDRH theory with density dependent meson-nucleon vertices. Applications to light nuclei are discussed with special emphasis on pairing and core polarization in weakly bound nuclei. Approaches accounting for continuum coupling in dripline pairing and core polarization are presented. Calculations for the halo nuclei $^8$B, $^{11}$Be and $^{19}$C show that shell structures are dissolving when the driplines are approached. Relativistic breakup data are well described by eikonal calculations. ; Comment: 10 pages, 8 figures Minimize

Year of Publication:

2000-12-22

Document Type:

text

Subjects:

Nuclear Theory

Nuclear Theory Minimize

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