[Isac-journal-club] Journal club today at 3:30

[Ragnar Stroberg]

Hi all,

Here's a reminder that we're holding a journal club meeting at 3:30 in the
MOB theory room.

Details are reprinted below.

See you there,

-Ragnar

The paper for this week is from the arxiv

https://arxiv.org/abs/1704.03785

(it's not yet published but it has obviously been submitted to PRL).

*Title:* Where is the neutron drip line for oxygen?

*Some questions to consider when reading:*
1) What question are they trying to answer (if you can't figure this one
out, you're not trying.)
2) What approach do they take, and what physics are they trying to
incorporate that might not be in previous treatments?
3) Would you consider this approach phenomenological or ab initio?

*Helpful background:*
1) Neutron dripline: the heaviest isotope of a given element which is
stable with respect to the emission of one or multiple neutrons.
2) History: the dripline of the oxygen at mass 24, is much lighter than was
naively expected, especially considering that oxygen has a magic number of
protons (Z=8). TRIUMF's very own Jason Holt provided an explanation of this
anomaly by including the effects of 3-body forces. The existence of oxygen
28 has not yet been experimentally established.
3) Berggren basis: a single-particle basis consisting of bound, resonant,
and continuum states.
4) Gamow Shell Model: a shell model calculation that uses the Berggren basis


*Questions for discussion:*
1) When fitting 7 parameters to 7 or 8 observables, the obvious danger is
overfitting. Do they make a compelling case that they aren't overfitting?
2) Are 3-body forces taken into account?
3) Does this study provide additional insight as to the location of the
neutron drip line?


-- 
Ragnar Stroberg
Postdoctoral research associate
Theory Department
TRIUMF
(604)-222-1047 x 6446
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