H. Terry Fortune

Professor
fortune@physics.upenn.edu
DRL 1N11
(215) 898-6024
(215) 898-2010
  • Degrees - Ph.D. Florida State Universtiy - 1967
  •               B.S. (summa cum laude) Memphis State University - 1963
  • Postdoctoral Appointee, Argonne National Lab (1967-69)
  • Assistant Professor, University of Pennsylvania (1969-72)
  • Associate Professor, University of Pennsylvania (1972-76)
  • Professor, University of Pennsylvania (1976-
Research Interests: 

 

  1. Structure of nuclei far from stability

“Neutron decays of 13Be to the excited 0+ state of 12Be”, Fortune and Sherr, Phys. Rev. C 82, 064302 (2010).

See also Phys. Rev. C 83, 024311 (2011).

  1. Masses of exotic nuclei

“18Na: Mass excess and low-lying states”, Fortune and Sherr, Phys. Rev. C 72, 034304 (2005) Coulomb energies in 17Ne and the gs mass of 18Na”, Fortune, Sherr, and Brown, Phys. Rev. C 73, 064310 (2006); “Two-proton decay energy and width of 19Mg(g.s)”, Fortune and  Sherr Phys. Rev. C 76, 014313 (2007);   Phys. Rev. C 83, 057301 (2011).

  1. Isospin symmetry and Coulomb energies

“Coulomb energies in18Ne”, Sherr and Fortune, Phys. Rev. C 58, 3292 (1998); “Structure of 12Be and 12O ground states”, Sherr and Fortune, Phys. Rev. C 60, 064323 (1999).

See also Eur. Phys. J. A5, 371 (1999); Phys. Lett. B503, 70 (2001); Phys. Rev. C 74, 054310 (2006); Phys. Rev. C 82, 027310 (2010); Phys. Lett. B  699, 281 (2011).

  1. Use of transfer reactions to determine widths for nuclear astrophysics

"Resonant rate for 15O (alpha,gamma)19Ne", Mao, Fortune, and Lacaze, Phys. Rev. Lett. 74,3760 (1995).

See also Phys. Rev. C 53, 1197 (1996); Phys. Rev. C 67, 064305(2003); Phys. Rev. C 68, 034317(2003); Phys. Rev. C 82, 034312 (2010).

  1. Collective states in pion double charge exchange

"Giant dipole resonances built on isobaric analog states in pion double charge exchange," S. Mordechai, et al., Phys. Rev. Lett. B 60, 408 (1988); "Pion double charge exchange to the double dipole resonance,"  Mordechai, et al., Phys. Rev. Letters 61, 531 (1988).  See also Phys. Rev. C 40, 850 (1990); Phys. Rev. C 41, 202 (1990).

  1.  Mechanism of pion-induced double charge exchange

“Systematics of pion double-charge-exchange reactions on T = 0 Nuclei”, Bland, et al, Phys. Lett. B 128, 157 (1983); ”DCX to the DIAS at Tpi = 292 MeV”, Zumbro, et al, Phys. Rev. C 36, 1479 (1987).

See also Phys. Rev. C 29, 2395 (1984); Phys. Rev. C 32, 349 (1985); Phys. Rev. C 34, 1895 (1986); Phys. Rev. C 35, 1334 (1987); Nucl. Phys. A 483, 514 (1988).

  1. Core-excitation amplitudes from transfer reactions

“Direct determination of (sd)3 (1p)-2 component in 17O(gs)”. Fortune, Bishop, Medsker, and Wildenthal, Phys. Rev. Lett. 41, 527 (1978).

See also Phys. Rev. C 18, 1563 (1978).

  1. Neutron-rich light nuclei via the (t,p) reaction

“Spectroscopy of 16C”, Fortune, et al, Phys. Lett. B 70, 408 (1977).

See also Phys. Rev. Lett. 40, 1236 (1978); Phys. Rev. C 18, 2727 (1978); Phys. Rev. C 28, 977 (1983); Phys. Rev. C 50, 1355 (1994).

  1. Resonances in (12C,alpha) reactions

“Resonances in 12C(12C, alpha)20Ne”, Fortune, Greenwood, Segal, and Erskine, Phys. Rev. C 15, 439 (1977).

See also Phys. Lett. B 63, 403 (1976); Phys. Rev. C 14, 1271 (1976).

  1. Nuclear coexistence and weak coupling

“Structure of 0+ states in 18O”, Fortune and Headley, Phys. Lett. B 51, 136 (1974); “Structure of low-lying positive-parity states of 18O”, Lawson, Serduke, and Fortune, Phys. Rev. C 14, 1245 (1975).

See also Nucl. Phys.A 465, 123 (1987).

  1. Multi alpha-particle clustering in nuclei

“Evidence for quartet states in 20Ne”, Middleton, Garrett, and Fortune, Phys. Rev. Lett. 27, 950 (1971).

See also Phys. Lett. B 52, 51 (1974).

  1. Use of mirror reactions to identify mirror states

“Study of mirror states in A = 19 with the (6Li, t) and (6Li, 3He) reactions on 16O”, Bingham, Fortune, Garrett, and Middleton, Phys. Rev. Lett. 26, 1448 (1971).

See also Phys. Rev. C 5, 682 (1971).

  1. Stripping to unbound states

“New method for distorted-wave analysis of stripping to unbound states”, C. M. Vincent and H. T. Fortune, Phys. Rev. C 2, 782 (1970).

See also Phys. Rev. 185, 1401 (1969); Phys. Rev. C 7, 865 (1973);  Phys. Rev. Lett. 43, 341 (1979).

  1. Heavy ion elastic scattering

“Close similarities in the excitation functions from the elastic 16O scattering from nuclei with A near 16”, Siemssen, et al, Phys. Rev. Lett. 25, 536 (1970).

See also Phys. Rev. C 5, 1839 (1972).

  1. Using reactions of type (Heavy ion in, light ion out) to populate high angular momentum states

“Selective population of highly excited states observed in the    16O(12C,alpha) 24Mg reaction”, Middleton, Garrett, and Fortune, Phys. Rev. Lett. 24, 1436 (1970).

See also Phys. Lett. B 39, 339 (1972)

 

 

Selected Publications: 

 

18. Widths and spectroscopic factors in 21O

H. T. Fortune and R. Sherr, Phys. Rev. C 85, 027305 (2012)

Published February 14, 2012

A recent 20O(d,p)21O experiment, in reverse kinematics,

discovered two new states in 21O at 4.77(10) and 6.17(11) MeV,

with Jp assignments of 3/2+ and of 3/2+ or 7/2-, respectively.

Both widths and spectroscopic factors were reported, along with

the branching ratio for the upper state to decay to the 2+ state

of 20O. We have computed single-particle widths for all the

relevant decays and have used them to extract additional

information for these two states, including the spectroscopic

factors for 2+ decay of the upper state with the two possible

Jp values. Our analysis prefers 7/2- for Jp.

 

 

17.  Binding energy of 22C

H. T. Fortune and R. Sherr, Phys. Rev. C 85, 027303 (2012)

Published February 9, 2012

The sensitivity of the calculated matter radius to the binding

energy is exploited to estimate the 2n binding energy of 22C,

using a recent experimental value of Rm = 5.4(9) fm. The result

is B2n < 220 keV, significantly smaller than another recent estimate.

[

16. B(E2) value and configuration mixing in 32Mg

H. T. Fortune, Phys. Rev. C 85, 014315 (2012)

Published January 18, 2012

I demonstrate that the B(E2) value in 32Mg can be understood

with a model in which both the ground and 2+ first-excited

states are predominantly of sd-shell character.

 

15.  New calculations of matter radii for neutron-rich C nuclei,

H.T. Fortune and R. Sherr, Eur. Phys. J. A 47, 154 (2011)

Published 15 December 2011.

We have used a simple model to re-calculate matter radii for 14-20C,

using updated information on the relevant nuclear structure.

Agreement with experiment is improved, but some small

differences remain.

 

14. Behavior of (sd)4+2 states coupled to p-shell cores,

H. T. Fortune,, Phys. Rev. C 84, 054312 (2011)

Published November 16, 2011

Energies of the lowest 4+ states in 10,12Be and 14,16C

are examined in a simple model that works surprisingly

well in three of the nuclei. The analysis suggests that

three configurations are important for the first 4+

state in 10Be.

 

13. Update on the 18Ne 7.37-MeV state and its mirror in 18O,

H. T. Fortune and R. Sherr,, Phys. Rev. C 84, 047301 (2011)

Published October 13, 2011

The recent discovery of a new state at 7.796 MeV in 18O has

caused us to revisit the problem of the 7.37-MeV state in 18Ne.

 

12.  Low-energy resonances in 17C,

H.T. Fortune, Physics Letters B 703, 71 (2011)

Published 1 September 2011

Simple shell-model calculations and single-particle widths

suggest that the apparent width for the lowest-energy

resonance in 17C, observed in 17C(p,p’) and 14C(12C, 9C),

must be the result of two or three unresolved narrow states,

and not the natural width of either. I offer suggestions

for and give limits on expected widths.

 

11. The puzzle of 32Mg,

H. T. Fortune, Phys. Rev. C 84, 024327 (2011)

Published August 29, 2011

An analysis of results of the 30Mg(t,p)32Mg reaction

demonstrates that the ground state is the normal state

and the excited 0+ state is the intruder, contrary to

popular belief. Additional experiments are suggested.

 

10.  (sd)2 states or superclusters in 10Be,

H. T. Fortune and R. Sherr, Phys. Rev. C 84, 024304 (2011)

Published August 9, 2011

A set of states in 10Be have very large a widths and very

small neutron strengths. We review the data and investigate

whether they are (sd)2 states and/or a clusters.

 

9.  Neutron widths and configuration mixing in 11Be,

H. T. Fortune and R. Sherr, Phys. Rev. C 83, 054314 (2011)

Published May 18, 2011

We use known widths and branching ratios in 11Be to discuss

Jp and configuration admixtures. Analysis favors 3/2- for

the 3.96-MeV state and three-state mixing for this Jp.

 

8.  Low-lying resonances in 14F and 14B,

R. Sherr, H.T. Fortune, Physics Letters B 699, 281 (2011)

Published 16 May 2011.

In a simple potential model, we have computed energies and

widths of low-lying resonances of 14F and have compared

them with recent experimental results. Consequences for

14B are summarized.

 

7. Update on energy and width of 19Mg(g.s.),

H. T. Fortune and R. Sherr, Phys. Rev. C 83, 057301 (2011)

Published May 5, 2011

We update our predictions for the width of 19Mg(g.s.) by

extending our calculations to the lower energy range found

experimentally.

 

6. Structure of 2+, T=2 states in A=12 nuclei,

H. T. Fortune and R. Sherr, Phys. Rev. C 83, 044313 (2011)

Published April 21, 2011

Using a reasonable but simple model, properties of 2+

states in 12Be and 12O are calculated and compared with

results of experiments.

 

5.  Widths in 15C and 15F,

H. T. Fortune, Phys. Rev. C 83, 024311 (2011)

Published February 22, 2011

Earlier data for the reaction 13C(t,p) have been analyzed

to extract widths for several states of 15C. Results

affect predictions of widths in 15F.

 

4.  Neutron decays of 13Be* to the 0+2 state of 12Be,

H. T. Fortune and R. Sherr, Phys. Rev. C 82, 064302 (2010)

Published December 3, 2010

We suggest that an appreciable portion of the 1/2- peak in

a recent 13Be* ? 12Be + n experiment is actually due to

5/2+ decays to the excited 0+ state.

 

3.  Energy and width of the excited 0+ state in 12O,

H. T. Fortune and R. Sherr, Phys. Rev. C 82, 034325 (2010)

Published September 27, 2010

We review predictions for the energy of the excited 0+

state of 12O and present new calculations of its width

Results are compared with those of a recent experiment.

 

2.  Update on a-particle and nucleon widths in 19F and 19Ne,

H. T. Fortune, A. Lacaze, and R. Sherr, Phys. Rev. C 82, 034312 (2010)

Published September 13, 2010

We present updated information and analysis for several states in

19F and 19Ne and correct a mistake in an earlier article.

 

1.  Coulomb energies in 16Ne and low-lying levels of 17Na,

H. T. Fortune and R. Sherr, Phys. Rev. C 82, 027310 (2010)

Published August 23, 2010

We have computed energies of 16Ne levels in a core plus

two-nucleon space, using known 16C energies and existing

wave functions. We have then used these energies to compute

properties of the first three levels of 17Na.  Significant

differences are found with results of a recent

microscopic-cluster-model formulation.