dm_task_force

Reference Link is a page where you can list journals or ideas

- GeodmHomestakeCosmo Groom Parameterization of muons at Homestake depth, propagated through rock using GEANT4 v4.9.3 P02 with new mu-nuclear to produce neutrons and all secondaries. Assumes a flat overburden, but has a good angular distribution of incoming neutrons. Uses “Soudan” rock.
- Muons generated via MUSUN, taking account of the geography and geology of the Homestake site. Muons then propagated through rock using GEANT4 v4.9.5 to produce neutrons and all secondaries. MUSUN+GEANT4
- External Link Muons generated via MUSUN, taking account of the geography and geology of the Soudan site. Muons then propagated through rock using GEANT4 v4.9.3 P02 with new mu-nuclear to produce neutrons and all secondaries.

- LXe Geometry and pictures Monica's slides
- LAr Geometry and pictures Chao's slides
- Ton scale LAr from Andrew Hime picturesAndrew Hime's slides
- GE Geometry and pictures Angie's slides

- Current Livetime = 2.12 years and Number of single NR after all cuts except muon veto = 0
- veto on muon entering water shield
- Energy ROI is 5 - 25 keVnr
- veto on electron recoil energy < 50 keVee deposited in liquid Xe,
- fiducial cut: r < 93cm & |z| < 84 cm,
- multiples cut - σr < 3cm & σz < 0.2cm

- Current Livetime = 169.1 years and Number of single NR after all cuts except muon veto = 26
- veto on muon entering water shield
- Energy ROI is 5-100 keVnr
- Yield cut = no ER of more than 10%
- single detectors of 10cm diam and 1 inch thickness, multiples down to 2 keVnr

- Current Livetime = 6.41 years and Number of single NR after all cuts except muon veto = 0
- veto on muon entering water shield,
- Energy ROI is 50-100 keVnr (energy resolution 8%)
- 55 cm from wall (resolution of a couple cm)
- de-excitation gamma - fPrompt from inelastic scatter
- multiples are included in the timing cut = >6 cm

- To coordinate the simulations it has been agreed that we will try to ascertain which physics lists are used for each study. In general, we will continue to work with v4.9.3 P02 modified with new muon-nuclear before switching (mid-december) to v4.9.5 which intrinsically has this mu-nuclear interaction. It has been pointed out that it is best to not only use esoteric version and physics list names but also try to be clear about which physics is included. The table below contains information in this direction. Eventually, we hope to be able to relate in a concise way what all the physics processes included are so there can be no ambiguity.

Version | Physics List(s) | Accurate Mu-Nuclear available? | Sheilding available? |
---|---|---|---|

v4.9.3 P02 | QGSP_BERT_HP, Mu-Nuclear (not in release) | not intrisically | not intrinsically |

v4.9.5 | QGSP_BERT_HP OR Shielding | yes | yes |

- The way the physics lists work is that a single list is to be included at a time. The relevant lists which are available are listed in this page. These lists have been used starting in v4.9.4 with the exception that the QGSP_BERT_HP list has been used (with the new muon-nuclear interaction) with the backported v4.9.3 P02

outline l

Reference methods as follows

**0. The simple LXe Monte Carlo**(4850 level) with isotropic angular distribution on a sphere (Monica)**1.“Groom” Parametrization**of muons at Homestake depth, propagated through rock using GEANT4 v4.9.3 P02 with new mu-nuclear to produce neutrons and all secondaries. Assumes Soudan rock and a flat overburden, but has a good angular distribution of incoming neutrons.**2. Best Model: Homestake MUSUN Muons + GEANT4**, taking account of the geography and geology of the Homestake site prepared by Chao and Angie. Muons are then propagated through rock using GEANT4 v4.9.5 to produce neutrons and all secondaries.**3. Homestake MUSUN Muons + FLUKA**: Muons generated via MUSUN, but then propagated through the rock via FLUKA (Raul and Angie)**4. Neutron Parameterization**: Muons generated via MUSUN, but then creating a Neutron parametrization instead of all secondaries (Chao)**5. Soudan MUSUN Muons + GEANT4**: Muons generated via MUSUN, taking account of the geography and geology of the Soudan site. Muons then propagated through rock using GEANT4 v4.9.3 P02 with new mu-nuclear to produce neutrons and all secondaries. (Angie and Melinda)**6. The Neutron Multiplicity Meter**(2100 mwe) with cosnθ distribution (partly derived from existing flux measurements)

- 4.4 E-5 (Simple LXe MC) Uses M&H muon flux rate at Homestake.
- 4.4 E-5 (Groom on LXe geometry) Explicitly tied to M&H rate.
- 6.46 E-5 (Neutron parameterization for LXe geometry) Deduced by MUSUN+GEANT4

- 4.4 E-5 (Simple LXe MC)
- 7.3 E-6 (Groom on LXe geometry)
- 1.75 E-5 (Homestake MUSUN + FLUKA on LXe geometry - Angie and Alex)
- 1.84 E-5 (Neutron parameterization for LXe)
- 1.76 E-5 (Best Model on GE - Angie and Shaun) rhel6
- 1.77 E-5 (Best Model on LXe - Angie)
- 1.76 E-5 (Best Model on LXe - Monica)
- 2.11 E-5 (Best Model on LAr geometry)

- 2.91 E-6 (Neutron parameterization for LXe) Normalized to MUSUN muon rate and then each neutron is parameterized singly

- 1.13 E-6 (Neutron parameterization for LXe) Normalized to MUSUN muon rate and then each neutron is parameterized singly
- 1.83 E-6 (Best Model on LAr)

- 1.00 E-8 (Neutron parameterization for LXe) singly thrown parameterized neutrons
- 2.38 E-6 (Neutron parameterization for LXe) parameterized muons creating neutrons in the shield
- 4.90 E-6 (Best Model on GE BLock only)
- 1.00 E-5 (Best Model on LXe - Angie) defined as Monica's below. When defined inside water shield, r=1.8m, rate is 2.77E-7

- 5.44 E -8 (Simple LXe MC) for NR_dep > 5 keV_r; 5.42 E -8 for NR_dep > 10 keV_r
- 4.9 E -5 (Groom on LXe geometry)
- 1.13 E -8 (Neutron parameterization for LXe) singly thrown parameterized neutrons (NR_dep > 5 keV_r)
- 5.84 E -5 (Neutron parameterization for LXe) parameterized muons creating neutrons in the shield(NR_dep > 5 keV_r)
- 6.25 E -5 (Best Model on GE Block only) no identifiable cut, 10-100keV edep in Ge detectors
- 4.96 E -6 (Best Model on GE towers - Angie and Shaun) rhel6, no identifiable cut, > 5keV edep in Ge detectors
- 3.10 E -5 (Best Model on LXe - Angie) for edep>5keV.
- 1.23 E -4 (Best Model on LXe - Monica) for NR_dep > 5 keV_r
- 1.25 E -5 (Best Model on LAr - Chao) for NR_dep> 5 keV_r; 1.23E-5 for NR_dep>50 keV_r.

- 5.44 E -8 (Simple LXe MC) for NR_dep > 5 keV_r; 5.42 E -8 for NR_dep > 10 keV_r
- 4.9 E -5 (Groom on LXe geometry)
- 1.13 E -8 (Neutron parameterization for LXe) singly thrown parameterized neutrons (NR_dep > 5 keV_r)
- 5.84 E -5 (Neutron parameterization for LXe) parameterized muons creating neutrons in the shield(NR_dep > 5 keV_r)
- 4.28 E -6 (Best Model on GE Towers - Angie and Shaun) rhel6, no identifiable cut, 10-100keV edep in Ge detectors
- 1.1 E -3 (Best Model on LXe - Angie) for edep>5keV. for 5-25keV cut, get 7.5E-4 events/s, no identifiable cut
- 4.70 E -5 (Best Model on LXe - Monica)
- 1.16E -7 (Best Model on LAr - Chao) for NR_dep within [50, 100] keV_r

- 1.1 E -10 (Simple LXe MC) for NR_dep > 5 keV_r & Single Scatter cut ( σr < 3cm & σz < 0.2cm); 1.0 E -10 for NR_dep > 10 keV_r
- 5.9 E -7 (Groom on LXe geometry)
- < 4.26e-12 (Neutron parameterization for LXe) singly thrown parameterized neutrons with upper energy limit
**need limit removed** - 7.26e-9 (Neutron parameterization for LXe) parameterized muons creating neutrons in the shield
- 8.30 E-8 (Best model on Ge Towers - Angie and Shaun)
- < 1.49 E - 8 (Best model on LXe - Monica) There are 0 events so I use the limit of 1 event in total livetime (~2.12 years) → need more stats
- 1.60 E -8 (Best model on LAr - Chao) single NR_dep within [50, 100] keV_r (10 events in 19.81 years)

- 3.2 E -12 (Simple LXe MC) WIMP Candidate: pass NR, Single Scatter, Elastic, and Fiducial Cut. NR cut: NR deposits in liquid Xe: 5 - 25 keVr. Single Scatter Cut: σr < 3cm & σz < 0.2cm, Elastic Cut: ER < 50 keVee in liquid Xe, Fiducial Cut: r < 93cm & |z| < 84 cm
- < 1.49 E - 8 (Best model on LXe - Monica) There are 0 events so I use the limit of 1 event in total livetime (~2.12 years) → need more stats
- < 1.60 E -9 (Best model on LAr - Chao) Set up a limit for livetime 19.81 years.

- 117:0 (Best model on Ge Towers - Angie and Shaun) veto definition: muon (>100MeV) enters or exits water tank)
- 0:0 (Best model on LXe - Monica)

- 9081:9 (Best model on Ge Towers - Angie and Shaun)
- 6978:0 (Best model on LXe - Monica) Muon entering water tank must have at least 1 GeV energy

- Description of the Geant4 v Fluka study. Refined from the original Feb 2011 charge.
- GEANT4 vs FLUKA Comparison Study of mu-induced neutron yield (Empl, Villano)

- Agenda with Presentations Link here

- Agenda with Presentations Link here

- Agenda with Presentations Link here

- Agenda with Presentations Link here

- Agenda with Presentations Link here

- Agenda with Presentations Link here

- Agenda with Presentations Link here

- Agenda with Presentations Link here

- Agenda with Presentations Link here

- Agenda with Presentations Link here

- Agenda with Presentations Link here

- Agenda with Presentations Link here

- List of Benchmark Plots and Numbers for discussion: Current LIST
- Agenda with Presentations Link here

- Agreed-upon Decisions and Near Term Jobs actionnov12.docx

- Minutes and job list found here

dm_task_force.txt · Last modified: 2014/05/27 13:34 by ss507