The Munich accelerator for fission fragments MAFF

Habs, D.; Groß, M.; Assmann, W.; Ames, F.; Bongers, H.; Emhofer, S.; Heinz, S.; Henry, S.; Kester, O.; Neumayr, J. B.; Ospald, F.; Reiter, P.; Sieber, T.; Szerypo, J.; Thirolf, P. G.; Varentsov, V.; Wilfart, T.; Krücken, R.; Maier-Komor, P.

doi:10.1016/s0168-583x(03)00496-8

Cited by 14 publications

(3 citation statements)

References 7 publications

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“…Depending on the energy range and the selected accelerator type the intensity and available element range of the secondary beam vary significantly. In Table 1 different scenarios for exotic-beam facilities are shown. A high-flux reactor can provide up to 1 Â 10 14 neutrons/cm 2 which are used to induce fission in very heavy target atoms like 235 U (Siegert et al, 1974;Habs et al, 2003). A high intensity, up to 10 15 sec À1 , can be reached with proton and deuteron FIGURE 4.…”

Section: Production and Separation Of Exotic Nucleimentioning

confidence: 99%

Mass and lifetime measurements of exotic nuclei in storage rings

Franzke

Geißel

Münzenberg

2008

Mass Spectrometry Reviews

221

189

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Mass and lifetime measurements lead to the discovery and understanding of basic properties of matter. The isotopic nature of the chemical elements, nuclear binding, and the location and strength of nuclear shells are the most outstanding examples leading to the development of the first nuclear models. More recent are the discoveries of new structures of nuclides far from the valley of stability. A new generation of direct mass measurements which allows the exploration of extended areas of the nuclear mass surface with high accuracy has been opened up with the combination of the Experimental Storage Ring ESR and the FRragment Separator FRS at GSI Darmstadt. In-flight separated nuclei are stored in the ring. Their masses are directly determined from the revolution frequency. Dependent on the half-life two complementary methods are applied. Schottky Mass Spectrometry SMS relies on the measurement of the revolution frequency of electron cooled stored ions. The cooling time determines the lower half-life limit to the order of seconds. For Isochronous Mass Spectrometry IMS the ring is operated in an isochronous ion-optical mode. The revolution frequency of the individual ions coasting in the ring is measured using a time-of-flight method. Nuclides with lifetimes down to microseconds become accessible. With SMS masses of several hundreds nuclides have been measured simultaneously with an accuracy in the 2 x 10(-7)-range. This high accuracy and the ability to study large areas of the mass surface are ideal tools to discover new nuclear structure properties and to guide improvements for theoretical mass models. In addition, nuclear half-lives of stored bare and highly charged ions have been measured. This new experimental development is a significant progress since nuclear decay characteristics are mostly known for neutral atoms. For bare and highly charged ions new nuclear decay modes become possible, such as bound-state beta decay. Dramatic changes in the nuclear lifetime have been observed in highly charged ions compared to neutral atoms due to blocking of nuclear decay channels caused by the modified atomic interaction. High ionization degrees prevail in hot stellar matter and thus these experiments have great relevance for the understanding of the synthesis of elements in the universe and astrophysical scenarios in general.

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Section: Production and Separation Of Exotic Nucleimentioning

confidence: 99%

Mass and lifetime measurements of exotic nuclei in storage rings

Franzke

Geißel

Münzenberg

2008

Mass Spectrometry Reviews

221

189

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“…This is precisely what was designed for the MAFF. In the design studies for MAFF, there is a through going ion beam tube inside the D 2 O filled moderator vessel of the research reactor FRM-II [28,29]. At the center of this ion beam tube, high thermal-neutron flux of *10 14 cm -2 s -1 can exist.…”

Section: Thermal Neutronsmentioning

confidence: 99%

Slow neutron reactions in inverse kinematics for isotope production: a primer

John

2014

J Radioanal Nucl Chem

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Slow neutron inverse-kinematic reactions offer unique advantages since their kinematical conditions can be tuned to utilize very high resonance cross-sections and to separate transmuted-isotopes online. New advances in plasma sciences and thermal neutron facilities can usher practical applications of this type of reactions in some special cases. Production and implantation of isotopicallypure short-lived and spin-polarized radiotracers has been identified as a probable first application. The production rates for 110m,g Ag radio-nuclides in 109 Ag(n, c) capture, that occur when a beam of 109 Ag ions traverses a thermal neutron column, have been calculated and the results are presented. To develop the idea of inverse reactions in physical grounds, further analyses and advances on the non-trivial technological issues related to the generation and control of high density and high volume particle beams, isotope separation methods, and high flux thermal neutron channels of matching parameters are required and a brief discussion on these aspects are also included.

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“…Nuclei with very large neutron excess play a dominant role on the r-process path. There are plans for new experimental efforts, such as the MAFF project of the Munich group [25], to extract neutron rich fission products from a reactor and to accelerate them for the investigation of heavy and superheavy nuclei in the neutron rich side of the valley of stability. It is therefore of great interest to study the behaviour of such nuclei by theoretical investigations.…”

Section: Introductionmentioning

confidence: 99%

Superdeformation in Pb isotopes with large neutron excess

Daoutidis

Lalazissis

2005

J. Phys. G: Nucl. Part. Phys.

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Covariant density functional theory (CDFT) is used to investigate superdeformation in Pb isotopes on the neutron rich side of the periodic table. Energy surfaces and deformation parameters in this region are calculated by solving the constrained relativistic Hartree Bogoliubov (RHB) equations. We use the parameter set DD-ME2, which has an explicit density dependence as well in the isoscalar as in the isovector channel together with the finite range pairing force D1S of Gogny. With increasing neutron number, we find a characteristic pattern for superdeformed minima in these nuclei.

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The Munich accelerator for fission fragments MAFF

Cited by 14 publications

References 7 publications

Mass and lifetime measurements of exotic nuclei in storage rings

Mass and lifetime measurements of exotic nuclei in storage rings

Slow neutron reactions in inverse kinematics for isotope production: a primer

Superdeformation in Pb isotopes with large neutron excess

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