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[Fizinfo] Atomki-szeminárium

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  • From: Zoltan Mate <mate AT>
  • To: Fizinfo AT
  • Subject: [Fizinfo] Atomki-szeminárium
  • Date: Fri, 17 Sep 2010 14:51:23 +0200 (CEST)
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  • List-id: ELFT HÍRADÓ <>

Az MTA Atommagkutató Intézetének nagy előadójában
(Debrecen, Bem tér 18/c. 12. ép. III. em.)
2010. szeptember 21-én, KEDDEN 11:00-kor

A. M. Mukhamedzhanov
(Cyclotron Institute, Texas A&M University, College Station)

Separation of nuclear reactions and spectroscopic factors

címmel előadást tart.
Az előadás előtt 10:30-tól tea.
Vendégeket szívesen látunk.

Máté Zoltán

The beginning of the 21-st century opens up a new chapter in nuclear
physics fueled by new generation of the radioactive beam facilities
allowing us to approach the nuclei away from the valley of stability. It
should lead to new discoveries in nuclear structure, nuclear reaction
fields and nuclear astrophysics which is closely related to cosmology.
The important part of the new programs, as it has been for previous fifty
years, is determination of spectroscopic factors (SFs) from nuclear
reactions, which play important role in nuclear physics and nuclear
astrophysics. Since the dawn of nuclear physics nuclear reactions,
(d,p), (3He,d), and later on (e,e'p) and nucleon knockout reactions
have been the main tool to determine SFs.
The phenomenological SFs extracted by
normalization of the DWBA cross sections to the experimental data are
supposed to be used as a test of many-body theories. However, the
parameterization of the DWBA reaction amplitude in terms of the SFs is
based on the drastic approximations. Nowadays ab initio nuclear many-body
theories of light nuclei are available. What should we expect when ab
initio many-body theory in continuum, at least for light nuclei, will be
delivered? An exact many-body theory will allow us to calculate
nuclear reactions based on the adopted NN and many-body nuclear
potentials. But NN potentials are not observable and there are infinite
number of the phase-equivalent NN potentials related via finite-range
unitary transformations. These unitary transformations are introduced to
soften the hard-core NN potentials to pave the way for perturbation
approach in many-body theory.
I show that the asymptotic normalization coefficients, which are
the amplitudes of the asymptotic tails of the overlap functions are
invariant under finite-range unitary transformations but SFs are not. The
main goal of this talk is to show that the amplitudes for the (d, p),
(d, pn) and (e, e'p) reactions determining the asymptotic behavior of the
exact scattering wave functions in the corresponding channels, in contrast
to SFs, are invariant under finite-range unitary transformations.
Moreover, the exact reaction amplitudes are not parameterized in terms of
the SFs and, hence, nuclear reactions in the exact approach cannot
provide a tool to determine SFs which are not observable. This separation
of nuclear reaction theory and SFs will require reshaping of the future
programs of existing and coming up radioactive beam facilities.

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