BE and charge radii well described (mostly isoscalar)

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Presentation transcript:

BE and charge radii well described (mostly isoscalar) Isovector sector unconstrained by real data Slope of asymmetry energy with density, L, is primarily isovector The things we know the best are unaffected by wildly different values of L You need neutron-rich matter (isovector) 208Pb is uniform nuclear matter – addresses L (but do we know everything we need from this?) 48Ca interpolate to intermediate A (big lever arm) Anchor FRIB radioactive program Need 48Ca to address in ab initio and DFT (bridge between the two) ab initio calculations can’t be done in 208Pb 3N forces

What are the fundamental parameters? FW, αD? Surface thickness? L? If surface thickness important, second Q2 point? What if central value of PREX holds up in PREX II? second Q2 point? Correlations between values in models – how do they change with 3N effects? (hard to do) For example - L = 3ρeqa’sym is unconstrained (isoscalar properties unaffected, even with L~180 – why is this “ridiculous”?) Ground state – doesn’t Excitations? αD? RNS? What are the “real” errors on RNS, or αD, and the theory? What is the model dependence of each of the measurements (or type of measurement)? How to compare? What kind of plots would we like to be able to show?

J. Piekarewizc Bob liked these plots

Bigger axes Fit our data point and our error bar We are not trying to distinguish between models There is no isovector data used in these fits HW: if you take our data point, does it rule out other data 2013

PREX I value gives large L value EOS unreasonably stiff OR – model not correct! (Far from χ2 minimum, but doesn’t affect BE or ρch – what about αD or RNS?) Fattoyev

Good isovector indicators Poor isovector indicators more in talk by Jorge Piekarewicz

Preliminary G. Hagen

3N forces needed for Ca48 to be doubly-magic Can do microscopic calculations for C48 G. Hagen

Other nuclei: DP, PDR, spin-M1 (data analysis in progress) 96Mo (DCS and PT): Dirk Martin 48Ca (DCS): Jonny Birkhan 90Zr (DCS): C. Iwamoto (PDR-region, published in PRL108, 262501 (2012)) 120Sn (DCS and PT): A.M. Krumbholtz, T. Hashimoto 154Sm (DCS and PT): A. Krugmann 88Sr, 92Mo (DCS): C. Iwamoto 70Zn (DCS):

Other nuclei: DP, PDR, spin-M1 (data analysis in progress) 96Mo (DCS and PT): Dirk Martin 48Ca (DCS): Jonny Birkhan 90Zr (DCS): C. Iwamoto (PDR-region, published in PRL108, 262501 (2012)) 120Sn (DCS and PT): A.M. Krumbholtz, T. Hashimoto 154Sm (DCS and PT): A. Krugmann 88Sr, 92Mo (DCS): C. Iwamoto 70Zn (DCS):

Al BeO Ca Ta Energy scan

Which nuclei? Stable Spin-0 Doubly magic Have first excited states far from elastic No deformations

Do theorists believe this? NO! But why? Claimed errors are too small From re-normalized chi2? Danielewicz

Gandolfi et al. PRC85, 032801 (2012) What can PREX II and/or CREX say about neutrons stars? “hard” to get mass and radius of same star Nazarewicz Steiner Nazarewicz

Danielewicz

very model dependent Isospin dependence of effective masses Bao-An Li