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Last updated 2010-Apr-1

ECT* Workshop  

Reactions and Nucleon Properties in Rare Isotopes 

April 6-10, 2010

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The study of rare isotopes addresses the properties of quantum drops with two strongly interacting Fermi liquids. In these systems the many-body shell structure changes due to the nontrivial influence of tensor forces, and new exotic modes of excitation are possible. A key ingredient is the changing behavior of protons and neutrons in nuclei with large asymmetry under the influence of collective phenomena.  Understanding their properties will also help to shed light on issues of astrophysical interest such as the r-process and nuclear physics aspects of neutron stars.
Single-nucleon properties have been probed mostly in stable nuclei, in particular with the (e,e′p) reaction. Future experimental work at RIKEN, FAIR/R3B, and FRIB/NSCL will rely on hadronic reactions to extract single-particle and collective properties in exotic nuclei. Extracting reliable and unambiguous information requires updating and improving the theoretical tools that are utilized to understand these reactions. This issue is urgent since too few groups are currently working on this topic. We therefore propose a workshop to promote a dialogue between experimentalists and theorists with two main goals:

1.    To evaluate the uncertainties in the data analysis related to reaction models with the intent to identify necessary developments in reaction theory.
2.    To discuss theoretical questions related to exotic isotopes that can motivate future experiments.

We intend to cover the extraction of single-particle properties from a variety of reactions. Various processes have been (are) employed for this purpose, such as electron scattering (e,e'p), transfer reactions (d,p), (p,d), (d,3He), hadronic knockout reactions like (p,2p),  (p,pn) and with heavy ions in inverse kinematics. In principle, it should be possible to extract a common value for spectroscopic factors that simultaneously describe all these reactions. However, experimental results are often inconsistent with each other due to the use of different kinematical regimes or different theoretical reaction models in the analysis of data.

We therefore intend to have critical discussions of relevant reaction models. Glauber inspired approaches are the method of choice to describe quasi-free scattering. The dispersive optical model (DOM) for elastic nucleon scattering allows extrapolations to the dripline and also determines single-particle wave functions (which are not constrained in other approaches). Hence, the DOM might help in reducing the above uncertainties. Calculations of folding potentials and the microscopic Green's function method are also of interest since they compute microscopically what the DOM extracts from a fit to data.

Currently, there exist two serious puzzles that will be discussed in detail. The first is the strong dependence of the absolute spectroscopic factors on separation energies, as obtained with knockout at NSCL/MSU that is not reproduced with transfer reactions. The second is the discrepancy of the Ay measurements in (p,2p) on stable targets with the standard DWIA. This might signal the need for dynamic changes of the nuclear force in the medium and the resolution of this problem paves the way for this reaction to be used as an accurate spectroscopic tool in inverse kinematics. The monopole, dipole, and Gamow-Teller responses are important tools to link the properties of nuclei to those of infinite matter. The evolution of their properties with nucleon asymmetry will also determine the behavior of neutrons and protons. We also plan to address the extraction of the symmetry energy at large N/Z ratios from present and future experiments. The Gamow-Teller response in exotic nuclei is expected to provide information on to the neutron-skin thickness. Charge-exchange modes may also influence absolute spectroscopic factors, since protons (for N>Z) couple directly to the GT resonance, which becomes stronger with increasing N-Z, whereas neutrons do not.

The main points to be discussed in the workshop are summarized as follow:

Current list of participants

4/6 4/7 4/8 4/9 4/10
1 Omar Benhar Univ Roma x x x x
2 Konstanze Boretzky GSI Darmstadt x x x x x
3 Ricardo Broglia Univ Milano x
4 Luciano Canton INFN Padova x x x x
5 Bob Charity Washington Univ St. Louis x x x x x
6 Gianluca Colo Univ Milano x x x x
7 Matthias Degroote Univ Ghent x x x x x
8 Arnas Deltuva Univ Lisbon x x x x
9 Lex Dieperink KVI Groningen x x x x x
10 Freddy Flavigny CEA-Saclay x x x x x
11 Umesh Garg Notre Dame Univ Indiana x x x x x
12 Alain Gillibert CEA-Saclay x x x x x
13 Muhsin Harakeh KVI Groningen x x x x x
14 Chuck Horowitz Indiana Univ Bloomington x x x x
15 Ron Johnson Univ Surrey x x x x x
16 Ritu Kanungo Saint Mary’s Univ Halifax x x
17 Jose Lay Univ Sevilla x x x x x
18 Roy Lemmon Daresbury x x x x
19 Corinne Louchart CEA-Saclay x x x x x
20 Antonio Moro Univ Sevilla x x x x x
21 Akram Mukhamedzhanov Texas A&M Univ x x x x x
22 Tetsuo Noro Kyushu Univ Fukuoka x x x x x
23 Alexandre Obertelli CEA-Saclay x x x x x
24 Taka Otsuka Univ Tokyo x x x
25 Arturo Polls Univ Barcelona x x x x
26 Arnau Rios Univ Surrey x x x x x
27 Jan Ryckebusch Univ Ghent x x x x
28 Hide Sakai Univ Tokyo x x x
29 Susumu Shimoura CNS Tokyo x x x x x
30 Ingo Sick Univ Basel x x x x x
31 Toshi Suzuki Nihon Univ x x x x x
32 Isao Tanihata            RCNP Osaka x x x
33 Jon Taylor Liverpool x x x x
34 Natasha Timofeyuk Univ Surrey x x x x x
35 Betty Tsang NSCL/MSU East Lansing x x x x x
36 Tomohiro Uesaka CNS Tokyo x x x x x
37 Yutaka Utsuno JAEA x x x x x
38 Dimitri Van Neck Univ Ghent x x x
39 Enrico Vigezzi Univ Milano x x x x x
40 Tomotsugu Wakasa Kyushu Univ Fukuoka x x x x x
41 Seth Waldecker Washington Univ St. Louis x x x x x


4/6 4/7 4/8 4/9 4/10
Thomas Aumann GSI Darmstadt x x x x x
Carlo Barbieri RIKEN Tokyo x x x x x
Filomena Nunes NSCL/MSU East Lansing x x x x
Jorge Piekarewicz FSU Tallahassee x x x x x
Willem Dickhoff Washington Univ St. Louis
x x x x x

Schedule of the workshop

Titles of talks are added as they come in. Some changes in the program have been made to accomodate travel constraints etc. Please inform the organizers of any inconsistencies asap.

Tuesday April 6th
9:00 am Arrival and registration
9:30 am Willem Dickhoff WU St Louis Introductory remarks workshop
9:45 am (30+15) Tetsuo Noro Kyushu Study of single particle properties and nuclear medium effects by using (p,pN) reactions
10:30 am Coffee
11:00 am (30+15) Bob Charity WU St Louis Studying neutron and protons correlations in the
framework of the dispersive optical model
11:45 am (30+15) Alexandre Obertelli CEA Saclay Discussion of one-nucleon removal cross sections
12:30 pm Discussion
1:00 pm Lunch
2:00 pm Jorge Piekarewicz FSU Introduction
2:15 pm (30+15) Umesh Garg Notre Dame GMR in the Sn and Cd isotopes: K, Kτ, and the MEM Effect
3:00 pm (30+15) Toshio Suzuki Nihon Electron capture reactions in fp-shell nuclei and beta decays
in rare  isotones
3:45 pm Coffee
4:15 pm (30+15) Arnau Rios Surrey Depletion of the nuclear Fermi sea
5:00 pm (30+15) Yutaka Utsuno JAEA Shell model approach to exotic nuclei--description by monopole-based universal interaction and development of a new MCSM code
5:45 pm Discussion
~7:00 pm Welcome dinner at "La Baracca"
Wednesday April 7th
9:00 am Filomena Nunes NSCL/MSU Introduction
9:15 am (30+15) Ron Johnson Surrey Extracting nuclear structure information from (d,p)and (p,d) experiments
10:00 am (30+15) Betty Tsang NSCL/MSU Spectroscopic Factors of Ar isotopes from transfer and
knock-out reactions
10:45 am Coffee
11:15 am (30+15) Akram Mukhamedzhanov Texas A&M The combined method for transfer reactions
12:00 pm (30+15) Natasha Timofeyuk Surrey Progress in understanding of the spectroscopic factors and their reduction from the standard shell model values
12:45 pm Discussion
1:00 pm Lunch
2:00 pm Tom Aumann GSI Introduction
2:15 pm (30+15) Ritu Kanungo St Mary's Reaction spectroscopy of neutron-rich nuclei at TRIUMF and GSI
3:00 pm (30+15) Isao Tanihata RCNP Osaka Looking for the Effects of Tensor Forces in Nuclei
3:45 pm Coffee
4:15 pm (30+15) Enrico Vigezzi
Milano Two neutron transfer and medium polarization effects in 11Li
5:00 pm (30+15) Ricardo Broglia
Milano NFT description of Cooper pair structure and tunneling in halo systems: the origin of pairing in nuclei
5:45 pm Discussion
Thursday April 8th
9:00 am Carlo Barbieri RIKEN Introduction
9:15 am (30+15) Taka Otsuka Tokyo Role of tensor and 3-body forces and exotic nuclei
10:00 am (30+15) Tomohiro Uesaka CNS Tokyo Polarization study of unstable nuclei
10:45 am Coffee
11:15 am (30+15) Lex Dieperink KVI
Charge and neutron radii of heavy nuclei in a generalized liquid drop model
12:00 pm (30+15) Ingo Sick Basel High momentum components: how to (and how not to) measure them
12:45 pm Discussion
1:00 pm Lunch
2:00 pm Filomena Nunes NSCL/MSU Introduction
2:15 pm (30+15) Antonio Moro Sevilla Understanding the scattering of 6He and 11Li at energies around the Coulomb barrier
3:00 pm (30+15) Arnas Deltuva Lisbon Few-body nuclear reactions in transition operator framework
3:45 pm Coffee
4:15 pm (30+15) Luciano Canton INFN Padova Study of low-lying resonances in light-medium rare isotopes
with a coupled-channel approach
5:00 pm (30+15) Jan Ryckebusch Ghent What densities can be probed in nucleon removal reactions?
5:45 pm (15) Jose Antonio Lay Sevilla Exploring continuum structures with pseudo-state basis
6:00 pm Discussion
Friday April 9th
9:00 am Tom Aumann GSI Introduction
9:15 am (30+15) Muhsin Harakeh KVI/GSI Gamow-Teller transitions: implications for Supernova scenarios and double-beta decay
10:00 am (30+15) Konstanze Boretzky GSI Experimental results on the dipole response of exotic nuclei
10:45 am Coffee
11:15 am (30+15) Tomotsuga Wakasa Kyushu Pionic and tensor correlations on spin and isospin responses
12:00 pm
Roy Lemmon Daresbury Quasifree Scattering Experiments at GSI/FAIR
12:45 pm (15)
Jon Taylor
Liverpool Analysis of 12C(p,2p)11B experiment at 400 AMeV in inverse kinematics at GSI
1:00 pm Lunch
2:00 pm Willem Dickhoff WU St Louis Introduction
2:15 pm (30+15) Hide Sakai Tokyo Search for the beta+ IVSM resonance via (t,3He) reactions at 900 MeV.  --The first result from SHARAQ spectrometer--
3:00 pm Carlo Barbieri RIKEN Introduction
3:15 pm (30+15) Susumu Shimoura CNS Tokyo Single-particle wave functions near the threshold
-- coupled-channel effects on spectroscopic factors --
4:00 pm Coffee
4:30 pm (30+15) Dimitri Van Neck Ghent Full spectral function in the dispersive optical model
5:15 pm (15) Seth Waldecker WU St Louis Extensions of the dispersive optical model
5:30 pm (15) Matthias Degroote Ghent Faddeev Random Phase Approximation: from nuclei to molecules
5:45 pm Discussion
~8:00 pm Social dinner at "Patelli's"
Saturday April 10th
9:00 am Jorge Piekarewicz FSU Introduction
9:15 am (30+15) Chuck Horowitz Indiana Parity violating measurements of neutron densities: the lead radius experiment and beyond
10:00 am (30+15) Arturo Polls Barcelona A microscopic perspective of the density dependence of the nuclear symmetry energy
10:45 am Coffee
11:15 am (30+15) Gianluca Colo Milano Constraints on the symmetry energy from the dipole response
of stable and unstable nuclei: a comparison with other
12:00 pm (30+15) Omar Benhar Roma How far can we push the impulse approximation picture?
12:45 pm Closing
~1:15 pm Lunch at "La Baracca"

Other important issues

If travelling part of your journey by train the Trenitalia website is very useful.

An idea of the likely temperatures and weather conditions in Trento can be found here.

The ECT webpage has information about local bus traffic to and from Villa Tambosi (see top of page )