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R Ogul,
A S Botvina,
U Atav,
N Buyukcizmeci,
I N Mishustin,
P Adrich,
T Aumann,
C O Bacri,
T Barczyk,
R Bassini, [......], K Suemmerer,
W Trautmann,
M B Tsang,
G Verde,
C Volant,
M Wallace,
H Weick,
J Wiechula,
A Wieloch,
B Zwieglinski
Physical Review C. 01/2012; 85(1).
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E. G. Adelberger,
A. B. Balantekin,
D. Bemmerer,
C. A. Bertulani,
J. -W. Chen,
H. Costantini,
M. Couder,
R. Cyburt,
B. Davids,
S. J. Freedman, [......],
C. Spitaleri,
F. Strieder, K. Suemmerer,
H. -P. Trautvetter,
R. E. Tribble,
S. Typel,
E. Uberseder,
P. Vetter,
M. Wiescher,
L. Winslow
[show abstract]
[hide abstract]
ABSTRACT: We summarize and critically evaluate the available data on nuclear fusion
cross sections important to energy generation in the Sun and other
hydrogen-burning stars and to solar neutrino production. Recommended values and
uncertainties are provided for key cross sections, and a recommended spectrum
is given for 8B solar neutrinos. We also discuss opportunities for further
increasing the precision of key rates, including new facilities, new
experimental techniques, and improvements in theory. This review, which
summarizes the conclusions of a workshop held at the Institute for Nuclear
Theory, Seattle, in January 2009, is intended as a 10-year update and
supplement to Reviews of Modern Physics 70 (1998) 1265.
04/2010;
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the ALADiN2000 Collaboration,
W. Trautmann,
P. Adrich,
T. Aumann,
C. O. Bacri,
T. Barczyk,
R. Bassini,
S. Bianchin,
C. Boiano,
A. S. Botvina, [......],
H. Simon, K. Suemmerer,
M. B. Tsang,
G. Verde,
C. Volant,
M. Wallace,
H. Weick,
J. Wiechula,
A. Wieloch,
B. Zwieglinski
[show abstract]
[hide abstract]
ABSTRACT: Isotopic effects in projectile fragmentation at relativistic energies have been studied with the ALADIN forward spectrometer at SIS. Stable and radioactive Sn and La beams with an incident energy of 600 MeV per nucleon have been used in order to explore a wide range of isotopic compositions. Chemical freeze-out temperatures are found to be nearly invariant with respect to the A/Z ratio of the produced spectator sources, consistent with predictions for expanded systems. Consequences for the proposed interpretation of chemical breakup temperatures as representing the limiting temperatures predicted by microscopic models are discussed. Comment: 7 pages, 4 figures, contribution to proceedings of International School of Nuclear Physics, 30th Course, Heavy-Ion Collisions from the Coulomb Barrier to the Quark-Gluon Plasma, Erice-Sicily: 16 - 24 September 2008
07/2009;
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W. Trautmann,
P. Adrich,
T. Aumann,
C. O. Bacri,
T. Barczyk,
R. Bassini,
S. Bianchin,
C. Boiano,
A. S. Botvina,
A. Boudard, [......],
H. Simon, K. Suemmerer,
M. B. Tsang,
G. Verde,
C. Volant,
M. Wallace,
H. Weick,
J. Wiechula,
A. Wieloch,
B. Zwieglinski
[show abstract]
[hide abstract]
ABSTRACT: The N/Z dependence of projectile fragmentation at relativistic energies has been studied in a recent experiment at the GSI laboratory with the ALADiN forward spectrometer coupled to the LAND neutron detector. Besides a primary beam of 124Sn, also secondary beams of 124La and 107Sn delivered by the FRS fragment separator have been used in order to extend the range of isotopic compositions of the produced spectator sources. With the achieved mass resolution of \Delta A/A \approx 1.5%, lighter isotopes with atomic numbers Z \le 10 are individually resolved. The presently ongoing analyses of the measured isotope yields focus on isoscaling and its relation to the properties of hot fragments at freeze-out and on the derivation of chemical freeze-out temperatures which are found to be independent of the isotopic composition of the studied systems. The latter result is at variance with the predictions for limiting temperatures as obtained with finite-temperature Hartree-Fock calculations.
12/2007;
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C. Sfienti,
P. Adrich,
T. Aumann,
C. O. Bacri,
T. Barczyk,
R. Bassini,
C. Boiano,
A. S. Botvina,
A. Boudard,
J. Brzychczyk, [......],
H. Simon, K. Suemmerer,
W. Trautmann,
M. B. Tsang,
C. Volant,
M. Wallace,
H. Weick,
J. Wiechula,
A. Wieloch,
B. Zwieglinski
Acta Physica Polonica Series B 12/2005; 37:193. · 0.90 Impact Factor
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F. Schuemann,
S. Typel,
F. Hammache,
F. Uhlig, K. Suemmerer,
I. Boettcher,
D. Cortina,
A. Foerster,
M Gai,
H. Geissel, [......],
M. Ploskon,
W. Prokopowicz,
E. Schwab,
P. Senger,
F. Strieder,
C. Sturm,
Zhi-Yu Sun,
G. Surowka,
A Wagner,
W. Walus
[show abstract]
[hide abstract]
ABSTRACT: Final results from an exclusive measurement of the Coulomb breakup of 8B into 7Be+p at 254 A MeV are reported. Energy-differential Coulomb-breakup cross sections are analyzed using a potential model of 8B and first-order perturbation theory. The deduced astrophysical S_17 factors are in good agreement with the most recent direct 7Be(p,gamma)8B measurements and follow closely the energy dependence predicted by the cluster-model description of 8B by Descouvemont. We extract a zero-energy S_17 factor of 20.6 +- 0.8 (stat) +- 1.2 (syst) eV b.
09/2005;
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[show abstract]
[hide abstract]
ABSTRACT: We have measured production cross sections and longitudinal momentum distributions of fragments from neutron-deficient 36Ar at 1.05 A.GeV. The production cross-sections show excellent agreement with the predictions of the semiempirical formula EPAX. We have compared these results, involving extremly neutron deficient nuclei, with model calculations to extract informa tion about the response of these models close to the driplines. The longitudinal momentum distributions have also been extracted and are compared with the Goldhaber and Morrissey systematics. Comment: 16 pages, 6 figures
10/2003;
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E. Wefers,
T. Faestermann,
M. Muench,
R. Schneider,
A. Stolz, K. Suemmerer,
J. Friese,
M. Hellstroem H. Geissel,
P. Kienle,
H.-J. Koerner,
G. Muenzenberg,
C. Schlegel,
P. Thirolf,
H. Weick,
K. Zeitelhack
[show abstract]
[hide abstract]
ABSTRACT: The fragment separator at GSI, Darmstadt, has been used to produce and separate very proton rich nuclei in the {sup 100}Sn region. By fragmentation of a {sup 112}Sn beam at 1 A{center_dot}GeV we produced nuclei along the rp-process path between {sup 77}Y and {sup 98}In. By implanting these ions into a silicon detector stack we were able to determine their halflives. Preliminary data are presented.
12/1999
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N. Iwasa,
F. Boue,
G. Surowka, K. Suemmerer,
T. Baumann,
B. Blank,
S. Czajkowski,
A. Forster,
M Gai,
H. Geissel, [......],
W. Schwab,
P. Senger,
J. Speer,
C. Sturm,
A. Surowiec,
T Teranishi,
F. Uhlig,
A Wagner,
W. Walus,
C. A. Bertulani
[show abstract]
[hide abstract]
ABSTRACT: We have measured the Coulomb dissociation of 8B into 7Be and proton at 254 MeV/nucleon using a large-acceptance focusing spectrometer. The astrophysical S17 factor for the 7Be(p,gamma)8B reaction at E{c.m.} = 0.25-2.78 MeV is deduced yielding S17(0)=20.6 \pm 1.2 (exp.) \pm 1.0 (theo.) eV-b. This result agrees with the presently adopted zero-energy S17 factor obtained in direct-reaction measurements and with the results of other Coulomb-dissociation studies performed at 46.5 and 51.2 MeV/nucleon.
10/1999;
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G. Surowka,
N. Iwasa,
F. Boue, K. Suemmerer,
T. Baumann,
B. Blank,
S. Czajkowski,
A. Foerster,
M. Gai,
H. Geissel, [......],
E. Schwab,
W. Schwab,
P. Senger,
J. Speer,
C. Sturm,
A. Surowiec,
T. Teranishi,
F. Uhlig,
A. Wagner,
W. Walus
[show abstract]
[hide abstract]
ABSTRACT: As an alternative method to determine the cross section of
7Be (p,γ )8B, the Coulomb dissociation
reaction 8B→ 7Be+p at Einc=254
MeV/u was measured. Our preliminary results show the dominant role of
the dipole excitation in the Coulomb break-up process. The extracted
astrophysical S17 factor is consistent with the lower-value
results both of the direct-capture studies, and the RIKEN
Coulomb-dissociation experiment at ~50 MeV/u.
Acta Physica Polonica Series B 02/1999; 30:549. · 0.90 Impact Factor
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T. Baumann,
H. Geissel,
H. Lenske,
K. Markenroth,
W. Schwab,
M. H. Smedberg,
T. Aumann,
L. Axelsson,
U. Bergmann,
M. J. G. Borge, [......],
C. Scheidenberger,
G. Schrieder,
H. Simon,
B. Sitar,
P. Strmen, K. Suemmerer,
T Suzuki,
M Winkler,
H. Wollnik,
M. V. Zhukov
[show abstract]
[hide abstract]
ABSTRACT: The fragment separator FRS at GSI was used as an energy-loss spectrometer to measure the longitudinal momentum distributions of {16,18}C fragments after one-neutron removal reactions in {17,19}C impinging on a carbon target at about 910 MeV/u. The distributions in the projectile frames are characterized by a FWHM of 141+-6 MeV/c for {16}C and 69+-3 MeV/c for {18}C. The results are compared with experimental data obtained at lower energies and discussed within existing theoretical models. Comment: 10 pages, 5 figures; uses elsart style; corrected list of authors; will be published in Phys. Lett. B
10/1998;
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[show abstract]
[hide abstract]
ABSTRACT: We have measured production yields and longitudinal momentum distributions of projectile-like fragments in the reaction 129Xe + 27Al at an energy of Elab=790 AMeV. Production cross sections higher than expected from systematics were observed for nuclei in the neutron-deficient tails of the isotopic distributions. A comparison with previously measured data from the fragmentation of 136Xe ions shows that the production yields strongly depend on the neutron excess of the projectile with respect to the line of beta-stability. The momentum distributions exhibit a dependence on the fragment neutron-to-proton ratio in isobaric chains, which was not expected from systematics so far. This can be interpreted by a higher excitation of the projectile during the formation of neutron-deficient fragments.
04/1998;
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C Rodriguez-Tajes,
D Cortina-Gil,
H Alvarez-Pola,
E Benjamim,
J Benlliure,
M Caamano,
E Casarejos,
K Eppinger,
H Geissel,
R Gernhaeuser, [......],
T Kurtukian,
P Maierbeck,
T Nilsson,
C Nociforo,
D Perez,
A Prochazka,
H Simon, K Suemmerer,
H Weick,
S245 Collaboration
[show abstract]
[hide abstract]
ABSTRACT: One-neutron knockout reactions have been studied in a systematic way for a set of neutron-rich projectiles. The goal of the experiment, performed at GSI, was to explore the evolution of the nuclear structure close to the neutron drip line, in the region between C and Al. The momentum distributions of the surviving fragments and the cross-sections of the knockout process have been measured and used as physical observables. This report focuses on oxygen and nitrogen isotopes around N = 14. In particular, we discuss the Case Of (12)N, for which the mentioned observables have been determined for the first time. We will consider (23)O, already studied in earlier experiments, as a reference.
ACTA PHYSICA POLONICA B. 40(3):859-862.
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D. Cortina-Gil,
J. Fernández-Vázquez,
T. Aumann,
T. Baumann,
J. Benlliure,
María José García Borge,
L. V. Chulkov,
U. Datta Pramanik,
C. Forssén,
Luis M. Fraile, [......],
H. Scheit,
R Schneider,
G. Schrieder,
H. Simon,
B. Sitar,
A. Stolz,
P. Strmen, K. Suemmerer,
I. Szarka,
H. Weick
[show abstract]
[hide abstract]
ABSTRACT: 4 pages, 1 table, 2 figures. One-nucleon removal reactions at relativistic energies have been used as a spectroscopic tool for obtaining information about the ground state of neutron-rich oxygen isotopes. Using the FRS at GSI, the longitudinal momentum distributions of the emerging fragments after breakup were measured along with the one-nucleon removal cross-sections. The relative contributions of the remaining fragments in their ground and excited states have been determined for a few cases from measurements of gamma rays in coincidence with the longitudinal momentum distribution.. The controversial case of O-23 has been directly addressed. Comparison of our exclusive momentum distributions for the one-neutron removal channel to theoretical momentum distributions calculated with an Eikonal model for the knockout process rendered a spin and parity of I-pi = 1/2(+) for the O-23 ground state. This result resolves the existent experimental discrepancy and supports sub-shell closure at N = 14 with a fairly pure 2s(1/2) neutron in O-23. Peer reviewed
-
B. Blank,
S. Czajkowski,
F. Davi,
R. Del Moral,
J.P. Dufour,
A. Fleury,
C Marchand,
M. S. Pravikoff,
J. Benlluire,
F. Boue, [......],
A Heinz,
M. Hellstroem,
Z Hu,
E Roeckl,
M. Shibata, K. Suemmerer,
Z. Janas,
M. Karny,
M. Pfuetzner,
M. Lewitowicz
Physical Review Letters.
-
D Cortina-Gil,
C Rodriguez-Tajes,
H Alvarez-Pol,
E Benjamim,
J Benlliure,
MJG Borge,
M Caamano,
E Casarejos,
A Chatillon,
K Eppinger, [......],
C Nocciforo,
C Pascual-Izarra,
A Perea,
D Perez-Loureiro,
A Prochazka,
H Simon, K Suemmerer,
O Tengblad,
H Weick,
M Zhukov
834:485C-487C.
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D. Perez-Loureiro,
J. Benlliure,
H. Alvarez-Pol,
B. Blank,
E. Casarejos,
D. Dragosavac,
V. Foehr,
M. Gascon,
W. Gawlikowicz,
A. Heinz, [......],
A. Kelic-Heil,
S. Lukic,
F. Montes,
L. Pienkowski,
K. H. Schmidt,
M. Staniou,
K. Subotic, K. Suemmerer,
J. Taieb,
A. Trzcinska
703:552-556.
-
C. Rodriguez-Tajes,
D. Cortina-Gil,
H. Alvarez-Pol,
T. Aumann,
E. Benjamim,
J. Benlliure,
M. J. G. Borge,
M. Caamano,
E. Casarejos,
A. Chatillon, [......],
A. Perea,
D. Perez-Loureiro,
A. Prochazka,
S. Schwertel,
H. Simon, K. Suemmerer,
O. Tengblad,
H. Weick,
M. Winkler,
M. V. Zhukov
83.
