Spes Workshop LNL 26 th 28 th May 2014 Prompt collective oscillations with exotic beams Letter of intent for the SPESALPI facility S Barlini from INFNFi and University of Florence ID: 933419
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Slide1
Second International Spes Workshop, LNL, 26 th- 28th May 2014
Prompt collective oscillations with exotic beams
Letter
of intent for the SPES-ALPI facility
S.
Barlini from INFN-Fi and University of Florence
Subscribers from:
INFN
(Fi,
Mi
, LNL, Bo
,
Ct, LNS), Italy
LPC, Caen, France
Daresbury
, UK;
NIPNE, Romania;
Nevsheir
University, Turkey;
IFJ PAN
Krakòw
,
Jagellonian
Univ., Warsaw Univ
., Silesian University
Katovice
, Poland
;
Ohio University,
US
R.Boskovic
Institute, Zagreb, Croatia
Slide2Physics caseThe Dynamical Dipole Resonance (DDR) is a collective oscillation occurring at the beginning of the interaction between nuclei with different N/Z.The centres of mass of protons and neutrons don’t coincide and a dipole moment oscillation develops in the mean-field of the system, with emission of high energy gamma.
Second International Spes Workshop, LNL, 26 th- 28th May 2014
N
1/Z1
N2/Z2
Dynamical Dipole γ
emission from a not equilibrated source
γ
γ
Earlier stage of nuclear interaction
Isospin
equilibration
The damping of the DD emission is connected to the dynamical evolution of the system towards the
isospin
equilibration.
Slide3Main features of the DDR emission
The DDR yield grows as a function of the charge-asymmetry of the two reaction partners. Usually, the DDR is studied as a function of the initial dipole moment (D
0
) of the system, defined as
The gamma energy of DDR is shifted to lower values (around 10 MeV) with respect to GDR emission (emitted when the system is equilibrated), as a consequence of the larger deformation of the system
N/Z dependence
DDR occurs typically at beam energies in the range around 6-12AMeV:
below 6AMeV the acceleration felt by the charge distribution is too small
beyond 12AMeV quenched oscillations and high pre- equilibrium particle emission
Energy range 6-12AMeV
DDR produces gamma’s with angular distribution peaked perpendicularly to the interaction axis of the two nuclei
Second International
Spes
Workshop, LNL, 26
th
-
28
th
May
2014
Physics case
Slide4Considering the connection of the DDR emission with the dynamic of the heavy ion collisions, the estimation of the total yield of the oscillation can be compared to the predicted values by dynamical model (as SMF) to constrain the stiffness of the Symmetry energy assumed in the calculations for the EOS.
Physics case Second International Spes Workshop, LNL, 26 th
- 28th May 2014
D.Pierroutsakou
et al. PRC80, 024612(2009)E.Giaz al., PLB submitted
36Ar+96Zr and 32
S+100Mo
16
O+
112
Sn
Asy
-stiff
Asy
-soft
Asy
-soft
Asy
-stiff
More data are
needed
Slide5The “standard” technique to disentangle the DDR emission is the comparison between two reactions (one charge symmetric system with small D0 and one charge asymmetric system with big D0) producing the same CN. Second International
Spes Workshop, LNL, 26 th- 28th May 2014The proposed experiments: CN reactions
Slide6ReactionN/ZCND0(fm)124Sn+
56Fe1.48 – 1.15180Os2590Kr
+90Zr1.50 -
1.25180Os21.5
ReactionN/ZCN
124Sn+58Ni
1.48 – 1.07182
Pt
124
Sn
+
64
Ni
1.48 -
1.29
182
Pt
132
Sn
+
58
Ni
1.64
– 1.07
190Pt
ReactionN/ZCN
124Sn+48
Ca
1.48 -
1.40
172
Yb
132
Sn
+
40
Ca
1.64
– 1.00
172
Yb
Energy range 6-12
AMeV
Reaction
N/Z
CN
D0
(
fm
)
133
Cs
+
48
Ca
1.42
– 1.40
181
Re
1.2
141
Cs
+
40
Ca1.56 - 1.00181Re36142Cs+40Ca1.58 – 1.00182Re36
SPES beam (UCx 200 µA)
141Cs : 2.6* 108pps142Cs : 2.69* 107 pps90Kr : 8.74* 107 pps132Sn : 3.11* 107 pps
132Sn: the “monster” resonance
Possible DDR dependence on the mass asymmetry between projectile and target (same initial dipole, obtained with a mass asymmetric and symmetric system to test possible difference in the dynamics of interaction)
New subject
The proposed experiments: CN reactions
Slide7SMF prediction for some of the proposed system (by M. Colonna)Isospin asymmetric: large initial dipole
DDR energy depends on the oscillation frequency
Time evolution of the dipole moment
Isospin
symmetric: no initial dipole
Bremsstrahlung quantitative formula:
Slide8The experimental apparatus: some requirementsEvaporation Residue (and Fission Fragments) Detection LCP for pre-equilibrium estimation
Gamma detectorPPACPhoswich detectors RCo detectorMass spectrometer….
GARFIELDFAZIAFARCOS
TRACE...HECTORSERPEMEDEA
PARISLaBr…
It is important to detect at the same time the ER, LCP and gamma rays (with ER-gamma and ER-LCP coincidences). A strong collaboration among the different experimental groups interested in this type of experiments should start in order to find what is the best and most feasible solution that can
be implemented.
Slide9S.Barlinia, G. Casinia, M. Binia, M. Brunob, M. Cinauseroe, M. D'Agostinob, D. Fabrise, N. Gellia, F. Gramegnae, T. Marchi
e, L. Morellib, A. Nanninia,A. Olmia, S. Valdrea, G. Pasqualia, S. Piantellia, G. Poggia, R. Albag, C
. Maiolinog, D. Santonocitog, G. Pretee, A. Braccoc
, F. Camerac, O. Wielandc, A.Giazc, F.L.C.Crespic, G.Benzonic, S.Leonic, B.Millionc, N.Blasic, M. Ciemala
d, B. Fornald, M. Kmiecikd, A. Majd, K. Mazurekd, B. Wasilewska
d, C.Borceai , M. Parloglp,i, M. Degerlier
f , T. Kozikju, A. Kordyaszwa
,
P.
Kulig
ju
,
Z.
Sosin
ju
,
A.
Wieloch
ju
,
T. Twarogju
, D. Sierpowskiju
, M. Kajetanowiczju, J. Lukasik
d,K. Korcyld,B. Klossi
, S. Kowalskisi, A. Grzeszczuksi,W. Zippersi, M. Chartierh, R. Lemmonh, Z. Basrakz, M. Milinz, N. Soicz, S. Szilnerz, A. Voinovoh, M.Colonnag, M.Di Torog, C.Rizzo
g, V.Barani
a INFN, Sezione di Firenze and Dipartimento di Fisica dell'Università, Firenze, Italyb
INFN,
Sezione di Bologna and Dipartimento di
Fisica
dell'Università,
Bologna, Italy
c
INFN,
Sezione di Milano and Dipartimento di
Fisica
dell'Università,
Milano, Italy
d
H. Niewodniczanski Institute of Nuclear Physics PAN, Krakow, Poland
e
INFN,
Laboratori Nazionali di Legnaro, Italy
f
Nevsehir University of Science and Art Faculty Physics Department, Nevsheir, Turkey
g
INFN,
Laboratori Nazionali del Sud , Catania, Italy
h
Daresbury Laboratory, Cheshire, United Kingdom
i
NIPNE-HH and Bucharest University, Romania
wa
University of Warsaw, Poland
ju
Jagellonian University, Krakow, Poland
si
Silesian University, Katowice, Polandoh Ohio University , USlp LPC, Caen, Francez R. Boskovic Institute, Zagreb,
Croatia