Towards(the(first(observa/on(of(( - PowerPoint PPT Presentation

Towards(the(first(observa/on(of(( isoscalar(giant(monopole(resonances(( in(unstable(/n(isotopes( with(CNS(Ac/ve(Target((CAT) � Shinsuke)OTA) ( the(University(of(Tokyo( Supported(by(KAKENHI(Grant(Number(15H00834( � Sep.(14E18,(2015 � COMEX5,(Krakow � ��

Nucleon(systems � 1 � A � �� atomic(nuclei( neutron(star( proton( =(protons(+(neutrons � ~(neutrons( neutron( 1fm( 10km( several(fm( 1.4g/cm 3 ((Sun) ( >10 14 g/cm 3 � ~10 14 g/cm 3 � These(many(body(systems((are( with(different(size(with(two( components,(which(is(governed( by(Equa/on(of(State(of(nuclear( ma\er( Determina2on)of)EoS)for)symmetric)and)asymmetric)ma9er � Sep.(14E18,(2015 � COMEX5,(Krakow � ��

Key(words � • Isoscalar(giant(monopole(resonance( – cf.(Keynote(talks(in(this(conferences(and(others( • Kτ((isospin(dependence(of(incompressibility(at( satura/on(density(of(asymmetric(ma\er)( – can(be(directly(extracted(via(experiments( – experiment(plan(of(132Sn(d,d’)( – pilot(experiment(of(132Xe(d,d’)( • CAT(Ac/ve(target(system(( – Newly(developed(for(high(luminosity(exp.( • High(luminosity( – (=(beam(intensity(x(target(thickness)( Sep.(14E18,(2015 � COMEX5,(Krakow � ��

Kτ � x 2 + · · · x 0 , α ) + 1 x 0 ) 2 E ′′ (¯ E ( ρ , α ) = E (¯ 2 [(1 + 3¯ x 0 , α )]¯ x 2 + · · · , ≡ ε 0 ( α ) + 1 2 K 0 ( α )¯ (16) ε 0 ( α ) = ε 0 + ε τ α 2 + O ( α 4 ) = ε 0 + J α 2 + O ( α 4 ) , K 0 ( α ) = K 0 + K τ α 2 + O ( α 4 ) � � K sym − 6 L − Q 0 α 2 + O ( α 4 ) . = K 0 + L K 0 K A ∼ K vol (1 + cA − 1 / 3 ) + K τ [( N − Z ) /A ] 2 + K Coul Z 2 A − 4 / 3 , Measurement(of(KA(by(changing(asymmetry((NEZ)/A(~(isospin � Sep.(14E18,(2015 � COMEX5,(Krakow � ��

Experimental(Value(of(Kτ � K A ∼ K vol (1 + cA − 1 / 3 ) + K τ [( N − Z ) /A ] 2 + K Coul Z 2 A − 4 / 3 , (α,α’)(measurement(at(RCNP � ignore(the(slight(change(of(A E1/3( filng(a(+(b((NEZ) 2 /A 2 (:(b(=(Kτ( Kτ((=(500(MeV(+E(100(MeV � K - K Z A (MeV) G.(Colo,(U.(Garg,(and(H.(Saga,(EPJA50((2014)(26 � 155 160 112-124 Sn 106,110-116 Cd K - K Z A (MeV) -4/3 155 150 -4/3 2 150 2 Coul 145 Coul 145 A 140 A 135 0.1 0.12 0.14 0.16 0.18 0.2 (N-Z)/A 140 Data:(( − D.(Patel(et(al.(PLB718((2012)(447( T.(Lie(et(al.,(PRC81((2010)(034309 � T.(Li(et(al.,(PRL99((2007)(162503 � Kτ(~(500E550(MeV(+E100MeV � Sep.(14E18,(2015 � COMEX5,(Krakow � ��

Ktau(project � not(official � K A ∼ K vol (1 + cA − 1 / 3 ) + K τ [( N − Z ) /A ] 2 + K Coul Z 2 A − 4 / 3 , 112Sn( 124Sn( (0.107) 2( (0.194) 2( =0.011 � =0.038 � 106Cd( 116Cd( (0.094) � (0.172) � Sep.(14E18,(2015 � COMEX5,(Krakow � ��

Ktau(Project � K A ∼ K vol (1 + cA − 1 / 3 ) + K τ [( N − Z ) /A ] 2 + K Coul Z 2 A − 4 / 3 , Isotope:(many(stable(nuclei(are(available(( =>(extend(to(the(unstable(nuclei(region( and(other(chains � 106Sn( 132Sn( 132Sn( (0.056) 2( Sn(isotopes � (0.242) 2( (0.242 � =0.003 � =0.059 � 132Sn@RIBF( Approved( Doubly(magic( Isotope � cf.(Ni(isotope(chain(:(M.(Vandebrouck(et(al. � Isotone � Sep.(14E18,(2015 � COMEX5,(Krakow � ��

Ktau(Project � 132Nd( Isotope:(many(stable(nuclei(are(available(( (0.09)2( =>(extend(to(the(unstable(nuclei(region( =0.008 � @HIMAC( and(other(chains � 2014 � 132Xe( Isobar:(li\le(dependence(on(A(=>(new( (0.212) � challenge((how(about(deforma/on?) � 106Sn( 132Sn( Isobar � 132Sn( (0.056) 2( (0.242) 2( (0.242 � =0.003 � =0.059 � 132Sn@RIBF( Approved( Doubly(magic( Isotope � Isobar � K A ∼ K vol (1 + cA − 1 / 3 ) + K τ [( N − Z ) /A ] 2 + K Coul Z 2 A − 4 / 3 , Sep.(14E18,(2015 � COMEX5,(Krakow � ��

PLAN:) ISGMR)IN)132SN)VIA)(D,D’) � Sep.(14E18,(2015 � COMEX5,(Krakow � ��

���������������� �������������� �� ������������������������ CNS(Ac/ve(Target((CAT) � • TPC (and( Si)array) Tracking(is(done(by(filng( the(energy(deposit(and(dris( >(100(kcps(beam(injec/on( – 0.4(atm.(pure( /me � deuterium(gas( Thickness(=(0.1(mg/cm 2( ( – Gas(Electron( ⇒ high(luminosity( Mul/plier((GEM)(:( ⇒ (p,p’),((d,d’),((a,a’) � required(gain(~(10 4( �� – 300(um(resolu/on( ���������������� achieved( �������������� �� ������������������������ (a) 9cm)x)9cm,)0.5mm t � ���������� ���������������� 10 0.45 ����������� Convers(2(deg(and( 9 0.4 >(4(deg.(at(14(MeV( ThetaCM((deg) � 8 0.35 7 by(TPC � 0.3 6 0.25 25cm � 5 0.2 4 10cm)x)10cm � 0.15 3 0.1 2 E~1kV/cm/atm � 0.05 1 0 0 0 5 10 15 20 25 30 �� 0 � 30 � Sep.(14E18,(2015 � COMEX5,(Krakow � Ex((MeV) � ���

RIBF113(experiment(132Sn(d,d’)( at(RIBF((in(near(future) � ! Diamond( ! Diamond) ! Plas/c( ! MWDCs( (0.2)mm)) ! MWDCs( ! MWDC) ! Degrader( 132Sn( 132Sn( 100(MeV/u( 100(MeV/u( >100kcps( >100kcps( (total(>300kcps)( � (total(~(1Mcps)( � ac/ve( target � TOFEBρEBρ � luminosity(=(10 5 (cps(x(10 20 cm E2( ((~(0.01(mb E1 s E1 ( � Sep.(14E18,(2015 � COMEX5,(Krakow � ���

Yield(and(Error(Es/ma/on � Expected(strength(distribu/on � Extrac/on(of(Kτ � Strength (a.u.) 170 (MeV) Very(simple( 6000 Ex = 13.84 Ex = 14.34 simula/on � 160 Ex = 14.84 5000 -4/3 150 A 2 4000 Z Coul 140 - K 3000 130 A K 2000 120 1000 110 0 0.05 0.1 0.15 0.2 0.25 0.3 (N-Z)/A 0 0 5 10 15 20 25 30 ⇒ error(of(Kτ(can(be(reduced(to(50( Excitation Energy (MeV) 10(days(w/( 100kcps)132Sn)beam)(>300kcps) MeV(from(70(MeV.( in)total)) ⇒ 0.5(MeV(difference(in(E GMR ( δEx(=(1(MeV(,δθ CM (=(0.5(deg( corresponds(to(80(MeV(difference( Total(cross(sec/on(is(calculated(using(OM.( in(Kτ � Only(monopole(/(spherical(Bessel( ⇒ dE GMR (~(0.17(MeV( Sep.(14E18,(2015 � COMEX5,(Krakow � ���

OPERATION)WITH)HIGH)RATE)BEAM) AND)132XE(D,D’) � Sep.(14E18,(2015 � COMEX5,(Krakow � ���

Opera/on(with(highEintensity(beams � w/(beam(intensity(of(10 6 (cps( segmented(THGEM � =>(O(1)(mA(at(last(THGEM. � large(energy(deposit(by(beam(caused( discharge(of(THGEM( because(of(too(much(gain(for(beam(region( gain(>2000 � gain(<(100 � gain(>2000 � =>(reduc/on(of(effec/ve(gain � mesh(grid � Segmented)THGEM) provides(be\er(energy( resolu/on(than(mesh(grid(along(the(beam(path.( =>(stable(with(up(to(the(500Ekcps(100EMeV/u( ~1mA( 132Xe(beam( � Sep.(14E18,(2015 � COMEX5,(Krakow � ���

132Xe(d,d’)(at(HIMAC � As(a(study(of(nuclear(incompressibility(in(isobars( and(test(for(the(highEintensity(beam(injec/on � • HIMAC( (22 th (–(25 th (Jan,(2015)( – 132Xe(( • 100MeV/u( • 500)kcps)) – 10 6 (ppp(with(2Esec( extrac/on ( – 3(GEMs(with(0.4E atm(deuterium( Synchrotron((at(Chiba(prefecture(in(Japan(( Mainly(used(for(radiotherapy � Sep.(14E18,(2015 � COMEX5,(Krakow � ���

132Xe(d,d’)(at(HIMAC � Hit(pa\ern(for(one(event � • HIMAC( (22 th (–(25 th (Jan,(2015)( – 132Xe(( • 100MeV/u( • 500)kcps)) – 10 6 (ppp(with(2Esec( extrac/on ( – Huge(number(of( delta(rays( deltaEray(energy(distribu/on � � 2 m e c 2 β 2 γ 2 d 2 N dTdx = 1 2 Kz 2 Z 1 F ( T ) T max = β 2 T 2 A 1 + 2 γ m e /M + ( m e /M ) 2 le. The factor F is spin-dep es F ( T ) = (1 − β 2 T/T max ); Sep.(14E18,(2015 � COMEX5,(Krakow � incident electrons, the indi ���

132Xe(d,d’)(at(HIMAC � Hit(pa\ern(for(one(event � Cut(by(pulse(height((or(charge) � Sep.(14E18,(2015 � COMEX5,(Krakow � ���

132Xe(d,d’)(at(HIMAC � Tracking(and(accumulate(events � δE=3.9(MeV( FWHM � Cut(by(pulse(height((or(charge) � w/(tracking(using(charge(and(dris(/me( taking(the(effect(of(diffusion(into(account( w/o(correc/on(of(efficiency( E(less(than(1/10(of(total(data( E(need(to(check(the(uniformity(and( stability(of(gain � Sep.(14E18,(2015 � COMEX5,(Krakow � ���

Summary(and(outlook � • CNS(Ac/ve(Target((CAT)(is(developed(for(the(measurement(of( deuteron((or(alpha)(inelas/c(sca\ering.( – Worked(with( the)high)intensity)beams)up)to)500)kcps .( – Achievable(luminosity(is(0.01(mbE1sE1( • Measurement(of(132Xe(d,d’)((and(14O)(was(performed(at(HIMAC.( – Elas/c(peak(is(observed.(The(excita/on(energy(resolu/on(is( 3.8)MeV) FWHM) (preliminary).( • ISGMR(in(132Sn(will(be(studied(via((d,d’)(reac/on(using(CAT(in(near( future.( – Systema/c(measurement(of(ISGMR(can(be(performed(at(RIBF.( • 132Sn,(106Sn,(A=132(isobar(etc.( Sep.(14E18,(2015 � COMEX5,(Krakow � ���

Collaborators � • CAT(development( • H307((140)( – S.)Ota,)H.)Tokieda,)C.S.) – CAT(developper((les)( Lee,)Y.N.)Watanabe ,(R.( – Y.(Kubota,(T.(Nakao,(T.( Kojima,(Y.(Aramaki,(S.( Nichi,(Y.(Tanaka,(K.(Okochi,( Michimasa,(H.(Matsubara,( A.(Obertelli,(A.(Corsi,(C.( M.(Dozono,(M.(Takaki,Y.( Santamaria,(J.(Gibelin,(Y.( Kiyokawa,((CNS)((J.( Matsuda,(Y.(Maeda( Zenihiro((RIKEN)(( • H307((132Xe)( • with(help(by( – CAT(developperY.(Maeda,( – H.(Yamaguchi,(K.(Yako( S.(Gotanda,(xxx,(U.(Garg,(Y.( (CNS)((H.(Otsu,(T.(Uesaka( Guputa,(T.(Peach( (RIKEN)(( • RIBF113((132Sn)(to(be( – E.(Takada((NIRS) � done( – S.(Ota,(U.(Garg(et(al.( Sep.(14E18,(2015 � COMEX5,(Krakow � ���