Physics with 4π−γ-detectors

Metag, V.; Fischer, Ralf; Kühn, W.; Mühlhans, R.; Novotny, R.; Habs, D.; Helmolt, U.v.; Heyng, H.W.; Kroth, R.; Pelte, D.; Schwalm, D.; Hennerici, W.; Hennrich, Heiko; Himmele, G.; Jaeschke, E.; Repnow, R.; Wahl, W.; Adelberger, E. G.; Lazzarini, A.; Simon, R. S.; Albrecht, R.; Kolb, B.

doi:10.1016/0375-9474(83)90695-4

Cited by 34 publications

(109 citation statements)

References 4 publications

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“…• are detected in the segmented NaI array Crystal Ball (XB) [11] surrounding the target. By means of a dual read-out in the forward direction [12] (up to 63…”

Section: Methodsmentioning

confidence: 99%

Systematic investigation of projectile fragmentation using beams of unstable B and C isotopes

Thies¹,

Heinz²,

Adachi³

et al. 2016

Phys. Rev. C

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Background: Models describing nuclear fragmentation and fragmentation-fission deliver important input for planning nuclear physics experiments and future radioactive ion beam facilities. These models are usually benchmarked against data from stable beam experiments. In the future, two-step fragmentation reactions with exotic nuclei as stepping stones are a promising tool to reach the most neutron-rich nuclei, creating a need for models to describe also these reactions. Purpose: We want to extend the presently available data on fragmentation reactions towards the light exotic region on the nuclear chart. Furthermore, we want to improve the understanding of projectile fragmentation especially for unstable isotopes.Method: We have measured projectile fragments from 10,12-18 C and 10-15 B isotopes colliding with a carbon target. These measurements were all performed within one experiment, which gives rise to a very consistent dataset. We compare our data to model calculations.Results: One-proton removal cross sections with different final neutron numbers (1pxn) for relativistic 10,12-18 C and 10-15 B isotopes impinging on a carbon target. Comparing model calculations to the data, we find that EPAX is not able to describe the data satisfactorily. Using ABRABLA07 on the other hand, we find that the average excitation energy per abraded nucleon needs to be decreased from 27 MeV to 8.1 MeV. With that decrease ABRABLA07 describes the data surprisingly well.Conclusions: Extending the available data towards light unstable nuclei with a consistent set of new data have allowed for a systematic investigation of the role of the excitation energy induced in projectile fragmentation. Most striking is the apparent mass dependence of the average excitation energy per abraded nucleon. Nevertheless, this parameter, which has been related to final-state interactions, requires further study.

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“…• are detected in the segmented NaI array Crystal Ball (XB) [11] surrounding the target. By means of a dual read-out in the forward direction [12] (up to 63…”

Section: Methodsmentioning

confidence: 99%

Systematic investigation of projectile fragmentation using beams of unstable B and C isotopes

Thies¹,

Heinz²,

Adachi³

et al. 2016

Phys. Rev. C

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“…Around the reaction target, the Crystal Ball detector [13], consisting of 162 sodium iodine crystals arranged in a shell, is placed to detect γ rays stemming from the deexcitation of excited states of the outgoing ions. The proton detection capability of the Crystal Ball was not needed for the present analysis.…”

Section: A Primarymentioning

confidence: 99%

Coulomb dissociation ofN20,21

Röder¹,

Adachi²,

Aksyutina³

et al. 2016

Phys. Rev. C

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Neutron-rich light nuclei and their reactions play an important role for the creation of chemical elements. Here, data from a Coulomb dissociation experiment on 20,21 N are reported. Relativistic 20,21 N ions impinged on a lead target and the Coulomb dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the 19 N(n, γ) 20 N and 20 N(n, γ) 21 N excitation functions and thermonuclear reaction rates have been determined. The 19 N(n, γ) 20 N rate is up to a factor of 5 higher at T < 1 GK with respect to previous theoretical calculations, leading to a 10 % decrease in the predicted fluorine abundance.

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“…Collectively enhanced E2-transitions were expected to originate from the broad 14 + structure at Ecru=25.7 MeV proceeding to the lower lying 12 + member around 19 MeV. However, only very weak yield was found for the 14 + ~12 + transition [6] being in poor agreement with theoretical estimates which were based on the hypothesis of quasimolecular states. Moreover, the data were consistent with an interpretation of these structures as shape resonances formed in a direct reaction, where the v-ray yield emerges as E2 nuclear bremsstrahlung in the collision process.…”

Section: Introductionmentioning

confidence: 46%

“…Significant differences in the results and more important in the ensuing consequences, however, can be stated. A branching ratio F~/F of (6_+3)-10 7 was found for the y-transition between the structures at 25.7 and 19.3 MeV [6]. This value was more than one order of magnitude smaller than expected from a simple estimate for a transition between molecular states.…”

Section: Y--~ A~(e) De + ~ Ap(e) De + ~ A(e) Dementioning

confidence: 80%