New Results On 8B And 23O Ground State Properties

Cortina‐Gil, D.; Fernández-Vázquez, J.; Attallah, F.; Baumann, Tobias; Benlliure, J.; Borge, M. J. G.; Chulkov, L. V.; Forssén, Christian; Fraile, L. M.; Geißel, H.; Gerl, J.; Ithashi, K.; Janik, R.; Jonson, B.; Karlsson, Sven; Lenske, H.; Mandal, Subhasish; Markenroth, K.; Meister, M.; Mocko, M.; Münzenberg, G.; Ohtsubo, T.; Ozawa, A.; Parfenova, Y.-U. L.; Pribora, V.; Richter, A.; Riisager, K.; Schneider, Roland; Scheit, H.; Schrieder, G.; Shul'gina, N.B.; Simon, H.; Sitár, B.; Stolz, A.; Strmeň, P.; Sümmerer, K.; Szarka, I.; Wan, Shaoke; Weick, H.; Zhukov, M. V.

doi:10.1063/1.1556659

Cited by 19 publications

(38 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The points in Fig. 2 representing the experimental measurement are compared with a solid line that is obtained from the complete GEANT simulation of our experiment including an exponential background [14,15,19].…”

Section: Volume 93 Number 6 P H Y S I C a L R E V I E W L E T T E R mentioning

confidence: 99%

Shell Structure of the Near-Dripline NucleusO23

Cortina-Gil¹,

Fernández-Vázquez²,

Aumann³

et al. 2004

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

Breakup reactions were used to study the ground-state configuration of the neutron-rich isotope 23 For decades the nuclear shell model has been one of the most important tools to interpret a wealth of experimental data. With the advent of radioactive-beam facilities, the evolution of nuclear shell structure far from the valley of stability could be studied. At present, such studies can be extended to the limits of bound nuclei on the neutron-rich side (the neutron dripline) for nuclear charges up to Z 8, oxygen. An important tool in this context are high-energy knockout reactions of single neutrons from near-dripline nuclei. Brown et al. [1] have shown that the residue momentum distributions and the corresponding cross sections can be analyzed in such a way that both the l values and the single-particle occupation probabilities of the levels can be deduced. This, however, requires that the level from which the breakup occurred is identified uniquely by measuring rays in coincidence with the residue [2,3].An interesting case to study is the series of neutronrich oxygen isotopes near the neutron dripline. As mentioned above, the experimental confirmation of such a theoretical analysis requires an exclusive knockout experiment where the individual levels are identified by measuring in coincidence the deexciting rays. We have performed such an exclusive experiment at the fragment separator FRS at Gesellschaft fü r Schwerionenforschung (GSI) in Darmstadt, Germany. The primary beam was 40 Ar at 1 GeV=nucleon delivered by the SIS synchrotron with an average intensity of 1:5 10 10 particles=spill.

show abstract

Section: Volume 93 Number 6 P H Y S I C a L R E V I E W L E T T E R mentioning

confidence: 99%

Shell Structure of the Near-Dripline NucleusO23

Cortina-Gil¹,

Fernández-Vázquez²,

Aumann³

et al. 2004

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Coulomb part of the dissociation cross section was refined by including the final state interaction into calculations and new data on the breakup of 8 B are analyzed [8,9,10]. Also a new set of calculations for the breakup of 8 …”

Section: The Reaction Modelmentioning

confidence: 99%

“…We show that the reaction is peripheral in various degrees, depending on the energy and target used. The 8 B ANC is extracted from existing breakup data at energies between 30-1000 MeV/nucleon and on different targets ranging from C to Pb [6,7,8,9,10]. Two approaches were used.…”

Section: The Reaction Modelmentioning

confidence: 99%

Breakup of loosely bound nuclei as indirect method in nuclear astrophysics: 8B, 9C, 23Al

et al. 2006

View full text Add to dashboard Cite

Abstract. We discuss the use of one-nucleon breakup reactions of loosely bound nuclei at intermediate energies as an indirect method in nuclear astrophysics. These are peripheral processes, therefore we can extract asymptotic normalization coefficients (ANC) from which reaction rates of astrophysical interest can be inferred. To show the usefulness of the method, three different cases are discussed. In the first, existing experimental data for the breakup of 8 B at energies from 30 to 1000 MeV/u and of 9 C at 285 MeV/u on light through heavy targets are analyzed. Glauber model calculations in the eikonal approximation and in the optical limit using different effective interactions give consistent, though slightly different results, showing the limits of the precision of the method. The results lead to the astrophysical factor S17(0) = 18.7 ± 1.9 eV · b for the key reaction for solar neutrino production 7 Be(p, γ) 8 B. It is consistent with the values from other indirect methods and most direct measurements, but one. Breakup reactions can be measured with radioactive beams as weak as a few particles per second, and therefore can be used for cases where no direct measurements or other indirect methods for nuclear astrophysics can be applied. We discuss a proposed use of the breakup of the proton drip line nucleus 23 Al to obtain spectroscopic information and the stellar reaction rate for

show abstract

“…This method makes use of the fact that due to the very low proton binding energy radiative proton capture is extremely peripheral and S 17 (0) can be calculated directly from the ANC. These ANC are determined from low-energy proton-transfer or from proton-removal cross sections [14,15,16]. A recent re-examination of ANCresults for 7 Be(p,γ) by Trache et al yielded a relatively small central value of S 17 (0) = 18.7 ± 1.9 eV b [15].…”

Section: Introductionmentioning

confidence: 99%

Low-energy cross section of theBe7(p,γ)
Schümann
¹
,
Typel
²
,
Hammache
³

et al. 2006
Phys. Rev. C
59
5
31
0
View full text Add to dashboard Cite

An exclusive measurement of the Coulomb breakup of 8 B into 7 Be+p at 254 A MeV was used to infer the low-energy 7 Be(p,γ) 8 B cross section. The radioactive 8 B beam was produced by projectile fragmentation of 350 A MeV 12 C and separated with the fragment separator FRS at GSI in Darmstadt, Germany. The Coulomb-breakup products were momentum-analyzed in the KaoS magnetic spectrometer; particular emphasis was placed on the angular correlations of the breakup particles. These correlations demonstrate clearly that E1 multipolarity dominates within the angular cuts selected for the analysis. The deduced astrophysical S17 factors exhibit good agreement with the most recent direct 7 Be(p,γ) 8 B measurements. By using the energy dependence of S17 according to the recently refined cluster model for 8 B of Descouvemont, we extract a zero-energy S factor of S17(0) = 20.6 ± 0.8(stat) ± 1.2(syst) eV b. These errors do not include the uncertainty of the theoretical model to extrapolate to zero relative energy, estimated to be about 5% by Descouvemont.

show abstract

New Results On 8B And 23O Ground State Properties

Cited by 19 publications

References 0 publications

Shell Structure of the Near-Dripline NucleusO23

Shell Structure of the Near-Dripline NucleusO23

Breakup of loosely bound nuclei as indirect method in nuclear astrophysics: 8B, 9C, 23Al

Low-energy cross section of theBe7(p,γ)
Schümann
¹
,
Typel
²
,
Hammache
³

et al. 2006
Phys. Rev. C
59
5
31
0
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

New Results On 8B And 23O Ground State Properties

Cited by 19 publications

References 0 publications

Shell Structure of the Near-Dripline NucleusO23

Shell Structure of the Near-Dripline NucleusO23

Breakup of loosely bound nuclei as indirect method in nuclear astrophysics: 8B, 9C, 23Al

Low-energy cross section of theBe7(p,γ)Schümann1, Typel2, Hammache3 et al. 2006Phys. Rev. C595310View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Low-energy cross section of theBe7(p,γ)
Schümann
¹
,
Typel
²
,
Hammache
³

et al. 2006
Phys. Rev. C
59
5
31
0
View full text Add to dashboard Cite